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WO2009097001A1 - Ensemble vitrage photovoltaïque double joint, et procédé associé - Google Patents

Ensemble vitrage photovoltaïque double joint, et procédé associé Download PDF

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Publication number
WO2009097001A1
WO2009097001A1 PCT/US2008/071176 US2008071176W WO2009097001A1 WO 2009097001 A1 WO2009097001 A1 WO 2009097001A1 US 2008071176 W US2008071176 W US 2008071176W WO 2009097001 A1 WO2009097001 A1 WO 2009097001A1
Authority
WO
WIPO (PCT)
Prior art keywords
seal
substrate
substrates
assembly
photovoltaic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2008/071176
Other languages
English (en)
Inventor
Robert C. Grommesh
Richard A. Palmer
Benjamin J. Zurn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cardinal IG Co
Original Assignee
Cardinal IG Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cardinal IG Co filed Critical Cardinal IG Co
Publication of WO2009097001A1 publication Critical patent/WO2009097001A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
    • H10F19/80—Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells
    • H10F19/807—Double-glass encapsulation, e.g. photovoltaic cells arranged between front and rear glass sheets
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
    • H10F19/80—Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F77/00—Constructional details of devices covered by this subclass
    • H10F77/93—Interconnections
    • H10F77/933—Interconnections for devices having potential barriers
    • H10F77/935—Interconnections for devices having potential barriers for photovoltaic devices or modules
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Definitions

  • the present invention pertains to photovoltaic glazing assemblies and more particularly to photovoltaic assemblies that include at least two substrates spaced apart from one another on either side of an airspace without a conventional preformed or metallic spacer.
  • Photovoltaic or solar cell devices or assemblies are used to convert light or solar energy into electrical energy. There are a variety of photovoltaic or solar cell devices but they generally fall into two basic categories or types, either bulk or thin film.
  • Wafer-based Typically, self-supporting wafers between 180 to 350 micrometers thick are processed and then joined together to form a solar cell module.
  • the most commonly used bulk material is silicon, more specifically crystalline silicon (abbreviates as "c-Si").
  • c-Si crystalline silicon
  • Thin film photovoltaic devices and thin film technologies have generally been developed with goals of reducing the amount of light-absorbing material required to create the solar cell or reducing overall size of the devices and assemblies. More recently, attention is increasingly being focused on enhancing the efficiency in the conversion of light to electrical energy. Ultimately, improvements in these areas can result in processing cost reductions compared to the costs for bulk solar cells devices.
  • Examples of materials that may be used in the manufacture of thin film photovoltaic devices include cadmium sulfide, cadmium telluride, copper- indium selenide, copper indium/gallium diselenide, gallium arsenide, organic semiconductors (such as polymers and small-molecule compounds like polyphenylene vinylene, copper phthalocyanine, and carbon fullerenes) and thin film silicon (typically deposited by chemical vapor deposition).
  • Thin film photovoltaic assemblies are conventionally manufactured by depositing thin film coatings or layers onto a substrate, such as glass, plastic or metal. Once the thin films are deposited they are generally sandwiched between a second substrate, typically of similar material and often referred to as a "backskin.”
  • a substrate such as glass, plastic or metal.
  • Another conventional solar cell configuration includes a polymeric encapsulant, such as polyethyl vinyl acetate (EVA), between the thin film coating and the second substrate or backskin. In other configurations, the polymeric encapsulant serves as the backskin. Similar encapsulation materials are known to be used in bulk devices and assemblies.
  • Glazing assemblies may include a pair of panels, or substrates, joined together such that a major surface of one of the substrates faces a major surface of the other substrates. At least one of the substrates of this type of glazing assembly is transparent, or light transmitting, and may bear a coating on the major surface that faces the major surface of the other substrate.
  • a glazing assembly is an insulating glass (IG) unit, wherein the inner, or facing surface of one of the substrates bears a low emissivity coating.
  • IG insulating glass
  • Such assemblies typically include a spacer and a sealant system and has an airspace typically filled with an inert gas or an airspace under vacuum.
  • sealant system including a first seal of polyisobutylene and a second seal of silicone have been frequently used due to it superior perfomance.
  • the spacer is a hollow tubular member that is packed with a desiccant material.
  • the seals were provided as strips and in others desiccant materials were embedded in the material forming the first and/or second seals.
  • Cardinal IG Company Cardinal
  • assignee of the present application manufactures IG units and has had a history of producing such units with industry leading weathering and durability performance for their IG units incorporating desiccated spacers and PIB and silicone sealant systems.
  • Glazing assemblies for photovoltaic application when configured as IG units, may be more cost effective than traditional laminated solar panels, for example, in that a bulk of the material (e.g. EVA), which encapsulates the photovoltaic coating, in the traditional solar panel, is replaced with an air space, thereby reducing material cost and manufacturing time, per unit.
  • EVA e.g. EVA
  • a photovoltaic glazing assembly has a first substrate and a second substrate.
  • the first substrate is formed of a transparent or light transmitting material.
  • Each of the first and second substrates have first and second major surfaces and each second surface has a central region and a periphery.
  • the second surfaces of the substrates face one another and are spaced apart from one another.
  • the assembly further includes a photovoltaic coating disposed over at least the central region of the second surface of the first substrate and a seal system comprised of a first seal and a second seal.
  • the seal system is disposed between the first and second substrates, joining the first and second substrates to one another, along their peripheries.
  • the seal system encloses an airspace that extends between the second surfaces of the first and second substrates and along the central regions thereof.
  • the first seal is formed of an extrudable material that results in a moisture vapor transmission rate therethrough, which does not exceed approximately 10 g mm/m 2 /day when measured according to ASTM F 1249 at 38 0 C and 100% relative humidity.
  • the first seal is formed of a desiccant-free polymeric material.
  • the first seal is comprised of a butyl sealant material and the second seal is comprised of a silicone sealant.
  • one or more openings may be provided, the one or more openings extending through the seal system or from the first surface to the second surface of either the first substrate or the second substrate.
  • the photovoltaic coating is disposed over both the central region and the periphery of the second surface of the first substrate.
  • the seal system extends over the periphery of the second surface of the first substrate. In other embodiments, the seal system further extends over an edge portion of the photovoltaic coating, the edge portion being located adjacent to the periphery of the second surface of the first substrate.
  • the assembly further includes a desiccant material disposed within the air space.
  • the assembly further comprises one or more seal members which are disposed within the airspace, which at least partially surround or border an opening through one of the substrates. Additionally, in some embodiments of the invention, the assembly may include one or more support members. [16] In another embodiment of the invention, a method for making a photovoltaic glazing assembly is provided.
  • the method includes the steps of forming a first substrate and a second substrate, the first and second substrates having first and second major surfaces, each of the second surfaces having a central region and a periphery, and at least the first substrate being transparent; forming a photovoltaic coating over at least the central region of the second surface of the first substrate or the second substrate; providing a seal system comprising a first seal and a second seal; applying the first seal to the periphery of at least one of the substrates; bringing the first and second substrates together in opposed relationship with the first seal disposed along the peripheries thereof, such that an airspace is formed between the second surfaces and along the central regions thereof; applying pressure to the assembly to join the first and second substrates together such that the airspace is maintained between the first and second substrates.
  • a method for making a photovoltaic glazing assembly includes the steps of providing a first substrate and a second substrate, the first and second substrates having first and second major surfaces, each of the second surfaces having a central region and a periphery, at least the first substrate being transparent and at least one of the substrates bearing a photovoltaic coating disposed over at least the central region of the second major surface; providing a seal system comprising a first seal and a second seal; applying the first seal to the periphery of at least one of the substrates; bringing the first and second substrates together in opposed relationship with the first seal disposed along the peripheries thereof, such that an airspace is formed between the second surfaces and along the central regions thereof; and applying pressure to the assembly to join the first and second substrates together such that the airspace is maintained between the first and second substrates.
  • the method may further include the step of applying a second seal over the first seal.
  • the applying step may further include depositing the first and second seals serially or simultaneously, prior to bringing the first and second substrates together.
  • the method may further include one or more of the following additional steps of forming at least one opening through the seal system or through the second substrate, the opening extending from the first to the second surface thereof and being located in the central region of the second surface; sealing the opening; providing a contact layer and/or bus bars affixed to the photovoltaic coating; providing at least one support member or a desiccant in the airspace.
  • Figure 1 is a perspective view of a glazing assembly, according to some embodiments of the present invention.
  • Figure 2 is a schematic plan view of either of the substrates of the assembly shown in Figure 1.
  • Figure 3 is a perspective view of a portion of the assembly shown in Figure 1 , according to some embodiments of the present invention.
  • Figures 4-6 are section views through line A-A of Figure 1 , according to various embodiments of the present invention.
  • Figure 7A is a cross-section of a portion of a coated substrate of any of the assemblies shown in Figures 4-6.
  • Figure 7B is a perspective view of a portion of any of the assemblies shown in
  • Figures 4-6 according to some further embodiments.
  • Figure 8A-8D are perspective views of a portion of the assembly shown in
  • Figure 1 according to some embodiments of the present invention.
  • Figure 9A-9D are perspective views of a portion of the assembly shown in Figure 1 , according to some embodiments of the present invention.
  • Figure 10 is a section view of a partially formed assembly according to some embodiments of the present invention.
  • Figure 11 is a partial section view of an assembly according to some embodiments of the present invention.
  • FIG. 1 is a perspective view of a glazing assembly 10, according to some embodiments of the present invention.
  • Figure 1 illustrates assembly 10 including a first panel, or substrate 11 , a second panel, or substrate 12 and a sealing system 13 which is disposed between first substrate 11 and second substrate 12 and which joins substrates 11 , 12 together; a first major surface 121 of each of substrates 11 , 12, face outward or away from one another, and a second major surface 122 of each of substrates 11 , 12 faces inward, or toward one another, being spaced apart from one another by seal system 13.
  • First and second surfaces 121 , 122 of each substrate 11 , 12 may be more clearly seen in the section views of Figures 4-6 and 9.
  • Seal system 13 comprises a first seal 14 and a second seal 15. Seals 14,15 can also be more clearly seen in Figures 4-6 and 9.
  • first substrate 11 , second substrate 12 or both may be transparent, or light transmitting, for example, formed from glass or a plastic material, such as polycarbonate.
  • first surface 121 is exposed to the external environment, i.e., faces the source of light entering the assembly, the corresponding substrate would be formed of a transparent or light transmitting material.
  • the opposed substrate may be similarly formed, according to some embodiments, but may be tinted, translucent, or opaque according to some alternate embodiments or may be provided with an opacifier layer. In other words, it need not have the same light transmitting properties or be formed of the same material.
  • first substrate 11 or second substrate 12 may be transparent and have its first surface 121 exposed to the external environment, i.e., facing the source of light.
  • first surface 121 of first substrate 11 is facing the source of light and first substrate 11 bears photovoltaic coating 42 on its second surface 122, first substrate 11 is transparent and the opposite substrate, second substrate 12, is not required to be transparent.
  • first surface 121 of second substrate 12 is facing the source of light and first substrate 11 bears photovoltaic coating 42 on its second surface 122, second substrate 12 is transparent and the opposite substrate, first substrate 11 , is not required to be transparent.
  • glazing typically connotes incorporation of a glass panel or substrate
  • the use of the term is not so limited in the present disclosure
  • glazing assemblies of the present invention may incorporate any transparent, or light transmitting substrate, for example, formed from a plastic such as polycarbonate, for use as substrates, 11 , 12.
  • a plastic such as polycarbonate
  • the embodiments illustrated in the figures are generally square or rectangular in shape, it should be understood that assemblies according to the invention are not limited to the illustrated shapes and, in fact, may be of any of a variety of desirable shapes, including, but not limited to, polygonal, circular, semicircular, oblong and the like.
  • Figure 2 is a schematic plan view of either of the substrates 11 , 12 of assembly 10.
  • Figure 2 illustrates second major surface 122 of substrate 11/12 having edge or edges 101 , a central region 103 and a periphery 105, which are delineated from one another by the dashed line.
  • seal system 13 joins first substrate 11 to second substrate 12 along at least a portion of periphery 105 of each substrate.
  • substrates 11 , 12 are of the same size or dimensions, they may be joined together with their peripheries 105 or edges 101 aligned.
  • substrates 11 , 12 may be joined together without their peripheries or edges being aligned. In such embodiments, this may be due to substrates 11 , 12 not having the same dimensions and when joined together by seal system 13, their peripheries may only be partially overlapping and their edges not directly aligned due to the size differential, one substrate being undersized relative to the other.
  • the phrase "along the periphery” or “along their peripheries” and similar references to the relationship between the peripheries of substrates 11 , 12 should be understood to include the peripheries being in a partially overlapping relationship as well as the peripheries 105 and/or the edges 101 of the substrates being aligned.
  • Figure 3 illustrates an airspace 200 that extends between second surfaces 122 of the joined substrates 11 , 12.
  • the term airspace is intended to encompass a space that is either filled with any type of gas, not only air, or that has a vacuum. In some embodiments of the invention, the airspace may be under vacuum or the gas may be under pressure.
  • Figure 3 further illustrates seal system 13 having a thickness t, corresponding approximately to the distance between the second surfaces 122 of joined substrates 11 , 12. In embodiments of the present invention, thickness t may range between approximately 0.01 inch and approximately 1.5 inches. According to preferred embodiments of the present invention, thickness t is preferably between approximately 0.01 inch and approximately 1 inch.
  • thickness t is preferably between approximately 0.01 inch and approximately 0.5 inch. In other alternate embodiments of the invention, thickness t is preferably between approximately 0.01 inch and approximately 0.1 inch; and in yet others thickness t is between approximately 0.01 inch and approximately 0.04 inch.
  • one or more openings 18 may be formed in substrates 11 , 12, for example, in second substrate 12 as shown in Figure 3, depicting a pair of optional openings 18.
  • Openings 18, may be used to equalize pressure within assembly 10 during manufacture or processing and/or to fill airspace 200 with another gas and/or to draw vacuum between joined substrates 11 , 12, and/or to dispense a desiccant material into airspace 200, and/or to provide access for other secondary manufacturing operations that need to be performed within airspace 200, for example, those related to a photovoltaic functional coating 42 borne by a substrate, such as is described below with reference to an exemplary coating shown in Figure 7A.
  • pre-formed seal opening 19 or grommets 19, as seen in Figure 3 may also optionally be provided in addition to or instead of openings 18. Seal openings 19 may be utilized for similar purposes to openings 18.
  • first seal 14 may be formed of an extrudable material such a as a polymeric adhesive material which more preferably is largely impermeable to moisture vapor and gases (e.g., air or any insulative gas fill).
  • first seal 14 is formed of an extrudable material having low moisture vapor transmission properties and more preferably an extrudable material resulting in a moisture vapor transmission rate (MVTR) therethrough, which does not exceed approximately 10 g mm/m 2 /day when measured according to ASTM F 1249 at 38 0 C and 100% relative humidity.
  • MVTR moisture vapor transmission rate
  • suitable first seal materials may have MVTR, when measured according to ASTM F 1249 at 38 0 C and 100% relative humidity, that does not exceed approximately 5 g mm/m 2 /day, and more preferably does not exceed approximately 1g mm/m 2 /day. It is an additionally desirable property that materials used for first seal 14 have excellent adhesion properties. Examples of suitable materials include both non-setting materials and setting materials, e.g., cross-linking, and may include thermoplastic, thermosetting and air, moisture or UV curable materials. In some preferred embodiments first seal 14 is comprised of a butyl sealant, such as polyisobutylene or butyl rubber. Materials suitable for use as first seal 14 preferably having low conductivity or electro conductivity.
  • first seal 14 is "desiccant free", meaning that it is applied without desiccant embedded or mixed in the sealant materials forming first seal 14.
  • Non-limiting, commercially available examples of materials that may be used as first seal 14 and exhibit one or more of the above-described desirable properties, e.g., low MVTR or low conductivity include but are not limited to AdcothermTM sealants such as PIB 7-HS, PIB 8- HS and PIB 29 available from ADCO Products Inc.
  • the second seal may be formed of any material having suitable adhesive properties. While the second seal preferably comprises a silicone material, this seal may alternatively be comprised of a polysulfide, a polyurethane, or any other material that forms a bond with the first seal 14 and the substrates or with first seal 14, the substrates and photovoltaic coating 42 and/or bus bars affixed thereto. Silicone material are preferred over polysulfides and polyurethanes, because they exhibit superior durability and are less susceptible to UV degradation. According to preferred embodiments of the present invention second seal 15 comprises a silicone sealant or adhesive.
  • silicone adhesives include but are not limited to 3-0117 silicone insulating sealant and 995 silicone structural sealant from Dow Corning, IGS 3729 sealant from Momentive Performance Materials (formerly GE Silicones), and SikaGlaze® sealants (IG -16, IG-25 and IG 25HM) from the Sika Corporation.
  • Embodiments of the present invention further include a photovoltaic coating extending over at least the central region or both the periphery and central region of major surface 122 of one of substrates 11/12.
  • second major surface 122 of first substrate 11 bears a photovoltaic coating.
  • the extent of a coating borne by second surface 122 of first substrate 11 may vary according to various embodiments, examples of which are illustrated in Figures 4-6.
  • First seal 14 formed, for example, of a polyisobutylene sealant will adequately adhere to both the native second surfaces 122 of substrates 11 , 12 and to materials forming the photovoltaic coating over surface 122, in order to join first and second substrates 11 ,12 together for the various embodiments described below in conjunction with Figures 4-6. Further, in some embodiments of the invention, first seal 14 will also adhere to bus bars and other electric contacts affixed to coating 42. In such embodiments, first seal may provide adhesive support to any adhesives or welding helping to secure bus bars and/or electric contacts and/or lead wires to one another and/or to coating 42.
  • Figures 4-6 are section views through line A-A of Figure 1 , according to various embodiments of the present invention.
  • Figure 4 illustrates a coating 42 disposed over only central portion 103 (Figure 2) of second surface 122 of substrate 11 , and seal system 13 extending over only periphery 105 ( Figure 2) of second surface 122.
  • Figure 5 illustrates an alternate embodiment wherein seal system 13 further extends over a portion of central region 103, and over an edge portion 420 of coating 42, which edge portion 420 is located adjacent to periphery 105.
  • Figure 6 illustrates another alternate embodiment, wherein coating 42 ' is disposed over both central region 103 and periphery 105, of second surface 122 of substrate 11 , so that seal system 13 extends over a portion of coating 42 ' .
  • a dashed line in each of Figures 4-6 schematically represents an optional desiccant material enclosed within airspace 200 to absorb any moisture that may pass through seal system 13 or that is present after assembly.
  • Desiccant material may be provided in a variety of forms, including but not limited to wafer forms, sheet or strip form, or granular form or packaged in a sack or bag, may be 'free-floating' in airspace 200, or adhered to one of substrates 11 , 12, or otherwise present in airspace 200, or may be in the form of commercially available desiccant-containing polymeric matrix material.
  • Preferred desiccant materials are of the type commonly referred to by those skilled in the art as molecular sieves.
  • Desiccant wafers are commercially available from, for example, Sud-Chemie of Bellen, N. M, for custom applications. Desiccant in granular form is commercially available from, for example, Zeochem, Louisville Kentucky, a manufacturer of molecular sieves. Molecular sieves are a preferred desiccant material because of their superior moisture retention at elevated temperature as compare to silica gels.
  • Desiccant sheets and strips can be readily prepared by applying an adhesive to a sheet material or providing an adhesive sheet material and then applying and adhering desiccant in granular form to the adhesive.
  • the adhesive may be applied over the entire surface of the sheet material or only over a central region.
  • adhesive may first be applied to the central region of the sheet material, followed by application of desiccant granules or beads.
  • the desiccant sheets may be provided with the granules deposited over the entire surface or only over the central region and with a release material over the granules and both the periphery and the central region.
  • the sheet material is additionally provided with a release material or sheet over the adhesive and the release sheet is perforated or scored so that a central portion can be removed; and then a desiccant is applied to the central region of the sheet material.
  • a release material or sheet over the adhesive and the release sheet is perforated or scored so that a central portion can be removed; and then a desiccant is applied to the central region of the sheet material.
  • granules will typically be adhered to the central region of the sheet material only so that the periphery will be available upon remove of the release material to secure the desiccant sheet without need for additional adhesives or tapes.
  • Suitable materials for the sheet material include those that allowing moisture to pass through or into them in order to be absorbed by the desiccant.
  • a release material over the desiccant granules may help prevent their removal by mechanical forces during handling, shipping and/or storage.
  • Desiccant containing bags can also be readily prepared but are generally commercially available from, for example, Sud-Chemie of Bellen, NM.
  • desiccated polymeric matrix materials include, but are not limited to, WA 4200, HA 4300, H9488J desiccated matrices from Bostik of Wauwatose, Wl and HL5157 desiccated matrix from HB Fuller Company of St. Paul, MN.
  • the aforementioned desiccant material which is enclosed within airspace 200, in combination with the aforementioned relatively low MVTR of first seal 14 of seal system 13, effectively prevents moisture build-up within airspace 200 that can lead to corrosion of certain elements of the photovoltaic coating or electrical connections or contacts.
  • coating 42 or 42 ' may be a bulk photovoltaic coating or a thin film photovoltaic coating. It is contemplated and should be understood that such coatings may be of any type known to those skilled in the art to be useful as a photovoltaic coating.
  • Figure 7A is a cross-section of substrate 11 bearing an exemplary photovoltaic coating 700 over second surface 122.
  • Figure 7A illustrates coating 700 of the thin film variety including from substrate 11 ,12 outward a first layer 701 formed of a transparent conductive oxide (TCO), for example, comprising tin oxide, a semiconductor layer 702, for example, comprising two 'sub-layers': Cadmium sulfide ('window' layer; n-type), extending over layer 701 , and Cadmium Telluride (absorbing layer; p-type), extending over the Cadmium sulfide.
  • TCO transparent conductive oxide
  • Figure 7A further illustrates an electrical contact layer 703, for example, comprising nickel, sandwiched between the Cadmium Telluride of semiconductor layer 702 and a contact layer 704 and bus bar 706, to which bus bar 706 electrical lead wires may be coupled for collection of electrical energy generated by a photovoltaic coating 700 in some embodiments of assembly 10 according to the invention.
  • the lead wires may be routed out from between substrates 11 , 12 through openings 18 and/or or seal opening 19 (Figure 3), or out through seal system 13, for example, as is illustrated in Figure 7B.
  • Figure 7B is a perspective view of a portion of a glazing assembly, for example, similar to assembly 10 of Figure 1 , wherein lead wires 76 extend through seal opening 19 in seal system 13 or between seal system 13 and second surface 122 of substrate 11.
  • Figure 7B illustrates each of lead wires 76 including an inner terminal end 71 , 701 coupled to bus bar 706 of coating 700, within airspace 200, and each of lead wires 76 including an outer terminal end 72, 702, accessible outside of airspace 200.
  • inner terminal ends 71 , 701 may be coupled to bus bar 706 of coating 700, prior to affixing first and second substrates 11 , 12 together with seal system 13, and then outer terminal ends 72, 702 may be coupled to power transmission system, power collection or storage system or a load upon installation of the completed glazing assembly.
  • opening(s) 18 Figure 3 are not required for embodiments of glazing assemblies that include the wire routing illustrated in Figure 7B, nor for yet another wire routing embodiment in which the lead wires are passed out from airspace 200 between seal system 13 and first substrate 11 , for example, as illustrated with dashed lines in Figure 7B.
  • opening 18 may not be required when seal opening 19 is provided (or when the wiring in routed between second surface 122 and seal system 13), both may be provided in some embodiments of assemblies of the invention. Whether opening 18 or seal opening 19, it should be understood that lead wires may be routed for coupling to bus bar 706, after substrates 11 , 12 are affixed to seal system 13; and that lead wires may be routed through opening 18 and/or seal opening 19 and/or between seal system 13 and second surface 122 of substrate 11 , 12 as mentioned above.
  • seal opening 19 can serve or perform substantially the same purpose or function as opening 18, i.e., pressure equalization, filling airspace 200 with a gas, drawing a vacuum, dispensing or depositing a desiccant material into airspace 200, and/or providing access for manufacturing operations performed within airspace 200.
  • assembly 10 may further include one or more seal members 80, that partially surround or border at least a portion of the perimeter of opening 18.
  • seal members 80 are illustrated. Seal members
  • seal members 80 provide a partial back stop against or enclosure into which potting materials may be applied and deposited in order to seal opening 18.
  • the seal members 80 contain a potting material 800 in a relatively fixed location within and/or around opening 18 until the material cures or sets.
  • the seal members may be extruded, preformed, or otherwise applied as a deposit of a polymeric or other suitable material. In some embodiments of the invention in which the seal members 80 are applied or deposited around the perimeter of opening
  • any of the extrudable materials suitable for use for first seal 14 may be deposited as a seal member 80.
  • Figure 8A illustrates the assembly including a circular shaped seal member 81 , having a thickness, like seal system 13, to span airspace 200 between first substrate 11 and second substrate 12.
  • Figure 8A further illustrates seal member 81 completely surrounding the perimeter of opening 18 as a seal member.
  • Figure 8B illustrates the assembly including a C-shaped seal member 82, which also has a thickness, like seal system 13 and seal member
  • Figure 8C illustrates the assembly including a V- shaped seal member 83, also having a thickness, like seal system 13 and seal member 81 of Figure 8A, to span airspace 200, but which partially surrounds the periphery of opening 18.
  • Figure 8D illustrates the assembly including a generally rectilinearly shaped seal member 84, partially surrounding the periphery of opening 18 and having a thickness , like seal system 13 and seal member 81.
  • seal members may be provided with a thickness that is less than that of seal system 13.
  • a potting material 800 is applied to seal off opening 18, and seal members 80 such as either of seal members 81 , 82, 83, 84 provide a barrier or backstop to control the flow of potting material 800, and thereby limit an extent of material 800 over second surface 122 of either or both of substrates 11 , 12.
  • opening 18 may further provide a passageway for routing lead wires from a photovoltaic coating that may extend over surface 122 of first substrate 11 or a bus bar in contact with the photovoltaic coating; according to these embodiments, potting material 800 is applied around the lead wires within opening 18.
  • Assembly 10 may further comprise one of more support members.
  • Support members when disposed in the airspace, can provide additional stability to the spacing between substrates 11 , 12 during processing, shipping, and handling. Additionally, support members can help prevent collapse of the airspace or contact between the coating, contact layer or bus bar and the opposed substrate, particularly when assemblies are manufactured at high altitude and transported through or installed in lower altitude areas. Support members may also increase thermal transfer from the semiconductor or coating 42, 42' to the uncoated glass and decrease temperature of assembly 10.
  • a variety of materials may be used as support members. Suitable materials may be flexible or resilient and preferably have a durometer sufficient to withstand thermal expansion and/or contraction of the airspace.
  • the support members may be extruded elements, preformed elements or applied as a deposit of a polymeric or other suitable material. Support members are preferably formed of a polymeric material.
  • Figures 9A-D are perspective views of a portion of a glazing assembly, for example, similar to assembly 10, shown in Figure 1 , wherein first substrate 11 is removed for clarity in illustration.
  • Support members 750 illustrated in 9A-D are intended to be illustrative, non-limiting examples. As can be seen, support members 750 may be provided in any of a variety of shapes or configurations.
  • Figures 9A-D present some embodiments of the invention incorporating one or more support members 750, which provide additional stability to the spacing between substrates 11 , 12.
  • Figure 9A illustrates a plurality of support members 751 each having a thickness, similar to seal system 13, to span airspace 200 between first and second substrates 11 , 12; each support member 751 is shown extending over a portion of central region 103.
  • Figure 9B illustrates a plurality of support members 752 , having a thickness, similar to seal system 13, to span airspace 200 between first and second substrates 11 , 12; support member 752 is shown extending diagonally between opposing corners of seal system 13.
  • Figure 9C illustrates a plurality of support members 753 having a thickness, similar to seal system 13, to span airspace 200 between first and second substrates 11 , 12; the plurality of support members 753 are shown located over central region 103.
  • Figure 9D illustrates a support member 754 having a thickness, similar to seal system 13, to span airspace 200 between first and second substrates 11 , 12; the plurality of support member 754 is shown located centrally located over a portion of central region 103.
  • Support members 750, 751 , 752, 753, 754 may be formed from the same materials useful for support members 81 , 82, as previously described.
  • any of the extrudable materials suitable for use for first seal 14 may also be deposited as a support member 750. While support members 750 in any of their various configurations may have a thickness, similar to that of seal system 13, it should be understood that the support members may have a thickness less than that of the seal system 13 and may not span the entirety of airspace 200 between first and second substrates 11 , 12 in all embodiments nor is a requirement of the invention that the support members do so. Further, still, it should be understood that when support members are being formed, for example when extruded or applied as a polymeric deposit, the support member may have a thickness greater than that of the seal system during some stages of assembly.
  • support members do not completely divide airspace 200 into multiple compartments; however, if support members are so applied, desiccant will need to be applied into each compartment, unless a means for fluid communications is provided between any such compartments. Also an opening 18 or seal opening 19 may need to be associated with each compartment if pressure equalization is required during assembly.
  • support members may be also be provided as a plurality of discrete deposits or a plurality of bumpers over major surface 122 ( Figure 9B) of either or both of first and second substrates 11/12.
  • support members 752 are shown.
  • the illustrated plurality of support members may be formed, for example, of discrete polymeric deposits or by extrusion of any of the extrudable materials suitable for use as first seal 14 or applied as pre-formed bumpers such as self-adhering bumpers available as 3M BumponTM bumpers or applied using other pre-formed materials such as Sentry Glas®Plus, available from DuPont, and PRIMACORTM, available from Dow Chemical.
  • the support members may additionally include a desiccant incorporated therein. Some polymeric materials used as support member, may require application of heat to secure and affix them in place.
  • a pair of panels, or substrates are formed according to methods well known in the art. Formation of one or both of the substrates may include a step of coating one or both major surfaces of the substrate. According to some preferred embodiments, the major surface of one of the substrates, which will face a major surface of the other substrate in the glazing assembly, for example, second surface 122 of first substrate 11 , is coated with either a low emissivity coating or a photovoltaic coating, according to methods known to those skilled in the art.
  • the initial substrate formation step may further include a step of forming at least one opening through one or both of the substrates, preferably, the substrate which does not include the coating.
  • a pair of panels, or substrates are formed according to methods well known in the art. Formation of one or both of the substrates may include a step of coating one or both major surfaces of the substrate.
  • the major surface of one of the substrates which will face a major surface of the other substrate in the glazing assembly, for example, second surface 122 of first substrate 11 , is coated with a photovoltaic coating, according to methods known to those skilled in the art.
  • the initial substrate formation step may further include a step of forming at least one opening through at least one of the substrates, preferably, the substrate which does not include the coating.
  • first seal 13 is applied to second surface 122 of either first or second substrate 11 , 12.
  • first seal 14 is sandwiched between the facing surfaces of the pair of substrates to join the substrates together along their peripheries while maintaining an airspace between the facing surfaces.
  • pressure is applied to the assembly to affix first seal 14 to the facing surfaces of the pair of substrates in order to form a partial coherent assembly.
  • an assembly 10 is shown with first seal 14 in place and recessed from the peripheral edges of substrates 11 , 12, defining a peripheral channel 130.
  • Second seal 15 is deposited or applied into peripheral channel 130 and over first seal 14. If the material forming second seal 15 requires curing, it will be allowed to cure after being deposited or after the assembly pressure has been applied to form a partially coherent assembly.
  • first seal 14 and second seal 15 are deposited either serially or simultaneously to second surface 122 of either first or second substrate 11 , 12.
  • first and second seals 14, 15 are sandwiched between the facing surfaces of the pair of substrates to join the substrates together along their peripheries while maintaining an airspace between the facing surfaces.
  • pressure is applied to affix seal system 13 to the facing surfaces of the pair of substrates in order to form a coherent assembly, for example, assembly 10, which still includes an airspace, such as airspace 200.
  • first and second substrates 11 , 12 are provided with first substrate 11 , being formed of a transparent or light transmitting material and each of the first and second substrates having first and second major surface 121 , 122, each second surface having a central region 103 and a periphery 105 and the second surfaces facing one another and spaced apart from one another such that their peripheries are at least partially overlapping and in some embodiments or their peripheries or edges are aligned.
  • first substrate has a photovoltaic coating disposed over at least a portion of second major surface 122, for example over central region 103 or over both central region 103 and periphery 105.
  • a seal system 13 is also provided and includes first seal 14 and second seal 15.
  • the step of providing seal system 13 may further comprise applying steps where first seal 14 is first applied or where first and second seals 14, 15 are applied serially or simultaneously, prior to forming the assembly.
  • the provided components are assembled to form assembly 10.
  • the assembly step includes, in some embodiments, applying pressure to the assembly so as to affix seal system 13 or first seal 14 to substrates 11 , 12. If first seal 14 is initially applied without second seal 15, second seal 15 is applied over first seal 14 and otherwise deposited into peripheral channel 130.
  • the method may further comprise one or more of the following additional steps: providing a desiccant; depositing or dispensing a desiccant in airspace 200; routing lead wires out from the from airspace 200; and forming an opening 18 through the second substrate; providing a pre-formed opening or grommet; routing lead wires out from airspace 200 through opening 18 and/or through a pre-formed opening or grommet.
  • first seal 14 and second seal 15 are shown having respective widths W 1 and W 2 and seal system 13 has an overall width w s , with w s representing the combined width of wi and W 2 .
  • width w s may range between approximately 0.2 inch and approximately 1.5 inches. According to preferred embodiments of the present invention, width w s is preferably between approximately 0.2 inch and approximately 1 inch.
  • pressure may be applied to assembly 10 manually or with pressing devices known to those skilled in the art. During the pressing step, pressure is applied to press the assembly to a nominal thickness or so that seal system 13 or first seal 14 has a thickness t.
  • the opening(s) may be used to perform secondary operations related to an airspace, for example, airspace 200.
  • the secondary operations that may be performed via opening(s) 18.
  • the coupled lead wires are routed out from airspace 200 through opening(s) 18, but according to alternate embodiments, the coupled lead wires are routed out through seal system 13 or through seal openings 19 in seal system 13, for example, as previously described in conjunction with Figure 7B, in which case, the wires may have been previously coupled to coating 42, 42' or bus bar 706, prior to affixing one or both of substrates 11 , 12 to seal system 13.
  • a diameter of the opening(s) 18, 19 may be between approximately % inch and approximately 1 inch in order to accommodate these secondary operations.
  • one or more openings are sealed off with a potting material. If substrate 12 bears a photovoltaic coating, along an inner or second surface 122 thereof, and lead wires extend through the one or more openings, then the potting material is applied around the lead wires to seal off the opening.
  • suitable potting materials include, without limitation, polyurethane, epoxy, polyisobutylene, and any low MVTR material; according to some embodiments, the same materials which forms first seal 14 may be used for the potting material.

Landscapes

  • Photovoltaic Devices (AREA)
  • Joining Of Glass To Other Materials (AREA)

Abstract

L'invention concerne un ensemble vitrage photovoltaïque comprenant un premier et un second substrat fixés ensemble mais espacés, de part et d'autre d'une lame d'air, par un système de scellement constitué d'un premier joint et d'un second joint. Un revêtement fonctionnel photovoltaïque est disposé sur une seconde surface principale d'un des substrats faisant face à la seconde surface principale de l'autre substrat. Des fils de raccord sont reliés à des barres omnibus et/ou à des contacts électriques fixés au revêtement fonctionnel et dirigés hors de la lame d'air. La fixation du système de scellement aux premier et second substrats pour assembler les substrats peut s'effectuer par application d'une pression sur les substrats.
PCT/US2008/071176 2008-02-01 2008-07-25 Ensemble vitrage photovoltaïque double joint, et procédé associé Ceased WO2009097001A1 (fr)

Applications Claiming Priority (2)

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US2542208P 2008-02-01 2008-02-01
US61/025,422 2008-02-01

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WO2009097001A1 true WO2009097001A1 (fr) 2009-08-06

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US12498610B2 (en) 2009-12-22 2025-12-16 View Operating Corporation Self-contained EC IGU
US11067869B2 (en) 2009-12-22 2021-07-20 View, Inc. Self-contained EC IGU
US10678103B2 (en) 2010-12-08 2020-06-09 View, Inc. Connectors for smart windows
US11262626B2 (en) 2010-12-08 2022-03-01 View, Inc. Connectors for smart windows
US12085818B2 (en) 2010-12-08 2024-09-10 View, Inc. Connectors for smart windows
US10180606B2 (en) 2010-12-08 2019-01-15 View, Inc. Connectors for smart windows
US12436438B2 (en) 2011-03-16 2025-10-07 View Operating Corporation Multipurpose controller for multistate windows
US10175549B2 (en) 2011-03-16 2019-01-08 View, Inc. Connectors for smart windows
US11181797B2 (en) 2011-03-16 2021-11-23 View, Inc. Connectors for smart windows
US11719992B2 (en) 2011-03-16 2023-08-08 View, Inc. Connectors for smart windows
CN106837094B (zh) * 2011-12-14 2021-06-25 唯景公司 用于智能窗户的连接器
US10591799B2 (en) 2011-12-14 2020-03-17 View, Inc. Connectors for smart windows
CN106837094A (zh) * 2011-12-14 2017-06-13 唯景公司 用于智能窗户的连接器
US10139696B2 (en) 2011-12-14 2018-11-27 View, Inc. Connectors for smart windows
US11352834B2 (en) 2011-12-14 2022-06-07 View, Inc. Connectors for smart windows
US11408223B2 (en) 2011-12-14 2022-08-09 View, Inc. Connectors for smart windows
US11719039B2 (en) 2011-12-14 2023-08-08 View, Inc. Connectors for smart windows
US12359501B2 (en) 2011-12-14 2025-07-15 View Operating Corporation Connectors for smart windows
US10139697B2 (en) 2011-12-14 2018-11-27 View, Inc. Connectors for smart windows
US11255120B2 (en) 2012-05-25 2022-02-22 View, Inc. Tester and electrical connectors for insulated glass units
US11733579B2 (en) 2012-08-23 2023-08-22 View, Inc. Photonic-powered EC devices
US11092868B2 (en) 2012-08-23 2021-08-17 View, Inc. Photonic-powered EC devices
US10288971B2 (en) 2012-08-23 2019-05-14 View, Inc. Photonic-powered EC devices

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