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WO2012090293A1 - Dispositif et procédé de formation d'électrode collectrice pour cellule solaire et tête de revêtement - Google Patents

Dispositif et procédé de formation d'électrode collectrice pour cellule solaire et tête de revêtement Download PDF

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Publication number
WO2012090293A1
WO2012090293A1 PCT/JP2010/073685 JP2010073685W WO2012090293A1 WO 2012090293 A1 WO2012090293 A1 WO 2012090293A1 JP 2010073685 W JP2010073685 W JP 2010073685W WO 2012090293 A1 WO2012090293 A1 WO 2012090293A1
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WIPO (PCT)
Prior art keywords
solar cell
electrode
collector electrode
coating
coating head
Prior art date
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Ceased
Application number
PCT/JP2010/073685
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English (en)
Japanese (ja)
Inventor
道弘 渡邉
齊藤　忠之
田島　淳一
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.)
SAT Co Ltd Japan
SAT Co Ltd Korea
Original Assignee
SAT Co Ltd Japan
SAT Co Ltd Korea
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Filing date
Publication date
Application filed by SAT Co Ltd Japan, SAT Co Ltd Korea filed Critical SAT Co Ltd Japan
Publication of WO2012090293A1 publication Critical patent/WO2012090293A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • H10F77/20—Electrodes
    • H10F77/206—Electrodes for devices having potential barriers
    • H10F77/211—Electrodes for devices having potential barriers for photovoltaic cells
    • 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 relates to a solar cell collector forming apparatus and a solar cell collector, particularly a finger electrode forming method, for forming a collector electrode on a light incident surface using a coating head having a plurality of discharge nozzles having a long hole cross section.
  • the present invention relates to a structure of a coating head and a manufacturing method in consideration of the manufacturing method and assemblability.
  • Solar cells are a clean energy source and attracting attention from various countries from the viewpoint of preventing global warming, and their actual introduction has been actively conducted.
  • solar cells such as silicon-based, compound-based, organic-based, and dye-sensitized types, but the center of the present and for some time is a crystalline silicon-based solar cell.
  • the present invention relates to the formation of the collector electrode of this solar cell.
  • a solar cell is generally manufactured by forming a pair of electrodes for output extraction on a light incident surface and a back surface of a photoelectric conversion unit that generates a photogenerated carrier by light incidence.
  • the electrodes provided on the light incident surface are formed in a comb shape having a plurality of finger electrodes having a small line width and a bus bar electrode having a relatively large line width in order to minimize the area that blocks incident light. Is done.
  • the finger electrode is made narrow in order to make the area that blocks incident light as small as possible, the electric resistance of the electrode increases, resulting in a decrease in current efficiency, resulting in a decrease in conversion efficiency of the solar cell. . Therefore, in order to secure more current and allow more incident light to reach the photoelectric conversion part, development of a formation method that can make the finger electrode as narrow as possible and increase the electrode thickness Is desired.
  • the ratio of the electrode thickness to the electrode width in the finger electrode cross section is called the electrode aspect ratio
  • the development of an apparatus for forming an electrode with a high electrode cross section aspect ratio is an important issue for improving the efficiency of solar cells. It has become.
  • the screen printing method is capable of forming an electrode with a material having a relatively high viscosity, and is currently a mainstream process.
  • Patent Document 1 and Patent Document 2 in the electrode formation by the ink-jet method which has been attracting attention recently, in order to apply an electrode material having a very low viscosity, droplets landed on the solar cell substrate Is widely diffused on the substrate, it is difficult to ensure the line width, and the thickness cannot be obtained, so that only a very low electrode aspect ratio can be obtained.
  • Patent Document 3 there is a method of applying offset printing of intaglio, but it is basically only an improvement plan for screen printing, such as having consumables and being unable to guarantee transfer performance. It has a fatal defect and has not been put into practical use.
  • the coating head having the discharge nozzle hole is manufactured using the latest processing technology such as laser, but with the current processing accuracy, there are many variations, and the equipment is not widespread, so it becomes expensive, Development of a new coating head structure and manufacturing method that can achieve both accuracy and cost is desired.
  • the coating solution is pressurized as it passes through a narrow nozzle, and the pressure is released as soon as it is discharged from the nozzle. Therefore, the line width on the cell is increased to 5-6 times the nozzle diameter. However, the drawing ability is lower than that of the screen printing method.
  • the slit coater has the following problems although there is a possibility that a narrow electrode width can be achieved by applying a thin gap shim.
  • the first problem is that, as shown in FIG. 1, the finger electrodes for solar cells are formed in a straight line at intervals of 4 to 5 mm.
  • the number of slit openings for formation is extremely small, and it is necessary to apply a pressure larger than the pressure applied by a normal slit coater.
  • the coating solution discharged from the discharge slit hole greatly expands the line width by releasing the pressure.
  • maintaining the shape on the cell substrate that is, achieving a high electrode aspect ratio. This is a problem.
  • the first problem is how to discharge a high-viscosity coating solution without increasing the pressure in a narrow slit gap.
  • the second problem is that, as can be seen from FIG. 1, the mainstream crystalline solar cells are cut out from the silicon wafer. Therefore, in order to ensure the effective number of cells, the four corners are often cut out. For this reason, the finger electrode near the periphery becomes shorter toward the end.
  • the conventional slit coater cannot control the application of this part because it cannot control the presence or absence of discharge in the width direction. This is the second problem.
  • the third problem is the performance and price of the application head.
  • a very narrow discharge nozzle hole In order to apply a narrow wiring such as a finger electrode, a very narrow discharge nozzle hole must be manufactured with high accuracy.
  • discharge nozzle holes are manufactured with the help of high-grade processing equipment such as laser processing and wire electric discharge processing.
  • high-grade processing equipment such as laser processing and wire electric discharge processing.
  • the processing equipment represented by the above is very expensive and cannot be procured everywhere, the coating head is also expensive.
  • the present invention solves the above-mentioned problems, and at the same time, is for forming a finger electrode having a narrow width and a high cross-sectional aspect ratio, and can provide a highly reliable electrode forming apparatus. This also leads to the realization of a solar cell that achieves high photoelectric conversion efficiency.
  • the opening for electrode formation is very short, 3-5% in terms of the opening length, and the pressure in the slit gap is that of Hagen Poiseuille. Assuming that the law is obeyed, the internal pressure increases 20 to 30 times. In this case, even if the discharge nozzle hole is made fine, the pressure is released after discharge, resulting in an excessive electrode width.
  • the coating solution when the coating solution is discharged from the coating head, if the solution reaches the discharge nozzle hole from the flow path and the discharge direction is perpendicular to the cell substrate surface, it will be in a jet state, and even if the pressure is lowered, the cell Due to the flow along the substrate surface, the width of the electrode formed is inevitably increased. In order to alleviate this situation, it is necessary to reduce the velocity vector component in the direction perpendicular to the substrate surface.
  • the problem can be solved by tilting the flow direction of the coating liquid reaching the discharge nozzle hole in the forward direction with respect to the coating direction. That is, the flow path direction in the slit gap is inclined in the forward direction with respect to the cell substrate surface.
  • the forward direction refers to a case where the flow of the substrate moves in a situation where the flow resistance is small with respect to the movement of the substrate
  • the reverse direction refers to a case where the substrate moves in the opposite direction.
  • the second feature of the present invention is that the length of the finger electrode can be controlled.
  • the cells constituting the photoelectric conversion unit which is the main part of the solar cell, are usually cut out from a silicon wafer, and in order to increase the utilization efficiency of the wafer, not a rectangle but a part of an arc is cut out. As shown, an octagon is often formed by cutting out four corners of the quadrilateral.
  • a coating solution is discharged from a slit coater with a normal discharge nozzle hole, it is discharged from each hole at the same time, so the finger electrodes that are formed have a constant length and can be handled at each corner of the solar cell. I can't.
  • the supply direction of the discharge nozzle holes arranged in the lateral direction in other words, by providing a slide valve perpendicular to the discharge direction, the control means for supplying and shutting off the coating solution to the discharge nozzle holes.
  • the third feature is not a coating head using an expensive processing technique but a proposal of a coating head structure and a manufacturing method using a normal processing technique.
  • the processing accuracy of the discharge nozzle hole is higher than that of the conventional method, and the discharge is necessarily stable.
  • the coating head is reduced in price because it is based on ordinary means, not a special processing technique.
  • the conventional coating head needs to be replaced entirely, whereas the present invention According to this structure, it is possible to provide a coating head that can be partially replaced and is far superior to conventional ones in many respects.
  • the present invention provides a plurality of finger electrodes for collecting the photogenerated carriers and the plurality of finger electrodes on a light incident surface of a photoelectric conversion unit that generates photogenerated carriers by light incidence.
  • the solar cell substrate (cell) is moved and pressurized from an application head composed of a plurality of discharge nozzle holes having a long hole cross section.
  • the solar cell collector electrode forming apparatus is characterized in that the collector electrode material is discharged and formed in a lump.
  • a plurality of finger electrodes that collect the photogenerated carriers and a bus bar electrode that collects the photogenerated carriers collected by the plurality of finger electrodes on a light incident surface of a photoelectric conversion unit that generates a photogenerated carrier by light incidence In the production of a solar cell having a structure, while the solar cell substrate (cell) is moved, a pressurized collector electrode material is discharged and collectively formed from an application head composed of a plurality of discharge nozzle holes having a long hole cross section. It was set as the structure of the formation method of the solar cell collector electrode characterized by the above-mentioned.
  • the pressurized collector electrode material is discharged by a coating head whose major axis of the discharge nozzle hole having the long hole cross section coincides with the coating direction of the collector electrode.
  • the solar cell collector electrode forming apparatus is characterized by being formed in a lump.
  • the discharge flow direction from the discharge nozzle hole having each long hole cross section is inclined to the opposite side with respect to the moving direction of the substrate. It was set as the structure of the formation apparatus of the solar cell collector electrode characterized by having provided the coating head.
  • the discharge direction from the discharge nozzle hole having each long hole cross section for discharging the finger electrode material of the solar cell is opposite to the moving direction of the substrate.
  • the solar cell collector electrode forming method is characterized by using a coating head that is inclined to the surface.
  • each nozzle for forming each electrode so as to match an electrode pattern corresponding to the shape of the solar cell substrate (cell).
  • the solar cell collector electrode forming apparatus is characterized in that the head is provided with an open / close valve capable of sequentially switching discharge / stop.
  • each of the discharge valves is provided by a mechanism capable of sliding in a direction perpendicular to the supply direction of the discharge flow path filled with the coating material.
  • the configuration of the solar cell collector electrode forming head is characterized in that the presence or absence of discharge from the nozzle hole can be controlled.
  • the solar cell collector electrode forming method using the coating head according to claim 7 is adopted.
  • the solar cell collector electrode forming apparatus according to any one of claims 1, 3, 4, and 6, wherein the coating head to be mounted is a thin layer obtained by cutting a block defining a gap between discharge nozzle holes and a discharge flow path. It was set as the structure of the solar cell collector electrode formation apparatus characterized by mounting the coating head which laminated
  • the solar cell collector electrode is formed by using the stacked application heads.
  • the plurality of discharge nozzle holes has a structure in which thin-layer spacers having discharge channels formed by cutting and blocks that define intervals are alternately stacked and fixed by stacking bolts.
  • the configuration of the coating head is characterized in that the discharge nozzle hole formed by the block and the spacer has a square cross-sectional shape.
  • a sliding valve is provided in a common supply flow path of the coating solution parallel to each fine discharge nozzle hole row, and each of the discharge nozzle holes is provided.
  • the configuration of the coating head is characterized in that the presence or absence of ejection can be controlled by opening and closing.
  • the collector and the forming method of the collector electrode of the cell substrate of the solar battery of the present invention can be obtained by using the collector and the forming method of the collector electrode of the cell substrate of the solar battery of the present invention, particularly the finger electrode.
  • a finger electrode having a narrow electrode width and a large electrode cross-sectional aspect ratio can be obtained.
  • it can greatly contribute to the improvement of the photoelectric conversion efficiency of the manufactured solar cell.
  • the process apparatus and method of the present invention have no consumables, so the running cost can be greatly reduced.
  • the effective utilization efficiency of the electrode coating material can be increased in the formation of finger electrodes for solar cells.
  • the effective utilization efficiency is 1.5 times or more. This is advantageous when using expensive coating solutions such as silver.
  • the multilayer coating head of the present invention can easily cope with changes in the finger electrode design of the solar cell, for example, changes in electrode width and electrode spacing.
  • the multi-layer coating head of the present invention can be manufactured by a conventional processing technique, and the price can be kept low. In the unlikely event that the thin layer spacer forming the nozzle is damaged, only the relevant part needs to be replaced, and the overall cost is low.
  • the multi-layer coating head of the present invention has a limited mechanism because of restrictions on the shape, etc., but the distance to the neighbor can be relatively large, and the application destination close to straight line drawing has a simple mechanism. Application deployment can be expected at a low price.
  • FIG. 5B is a schematic view of the embodiment of the present invention, in which the coating head is tilted to tilt the discharge direction of the coating solution from the discharge nozzle hole with respect to the substrate surface, thereby mitigating the collision.
  • FIG. (C) is a view schematically showing a state in which the coating head itself is not tilted, but the channel leading to the discharge nozzle hole is tilted to reduce the collision.
  • the embodiment of the present invention shows a discharge control mechanism for a region where the electrode coating length of the cell substrate is changed, and shows a configuration in which the coating solution fed from the pump is caused to flow from the end of the coating head. It is a figure. It is the figure which showed the structure of the lamination type coating head which is an Example of this invention. It is the figure which showed two components which form a discharge nozzle hole among the components which comprise the lamination type coating head which is an Example of this invention.
  • the one electrode is generally formed in a comb shape by combining a plurality of narrow finger electrodes and a wide bus bar electrode.
  • the finger electrode is an electrode that collects photogenerated carriers generated in the photoelectric conversion unit, and is arranged over almost the entire surface of the photoelectric conversion unit.
  • the bus bar electrode is an electrode for collecting photogenerated carriers collected by a plurality of finger electrodes, and is formed in a straight line so as to intersect the finger electrodes.
  • the photoelectric conversion unit can generate photogenerated carriers not only from the front surface but also from the back surface
  • the light incident surface of the photoelectric conversion unit includes not only the surface of the photoelectric conversion unit but also the back surface. included. Therefore, finger electrodes and bus bar electrodes are similarly formed on the front and back surfaces of the photoelectric conversion portion.
  • a collector electrode of a solar cell is made of a conductive material, and a typical example is a conductive paste such as a thermosetting conductive resin using an epoxy resin as a binder and conductive particles as a filler.
  • the filler of the collector electrode is intended to obtain electrical conductivity, and at least one kind of metal particles selected from silver, copper, nickel, aluminum, tin, or the like, or an alloy or mixture thereof can be applied as a composition.
  • the binder of the collector electrode is mainly intended to adhere a filler, and in order to maintain reliability, it is required to be excellent in moisture resistance and heat resistance.
  • the photoelectric conversion part has high heat resistance like a crystalline semiconductor
  • an inorganic material that can be cured and fired at high temperature can be used as the binder.
  • metal particles such as silver and aluminum correspond to those composed of glass frit and organic vehicle.
  • the collector electrode of the solar battery cell particularly the finger electrode
  • Items required for the collector electrode of the solar battery cell, particularly the finger electrode are an increase in the opening area for light incidence and a reduction in resistance loss.
  • the mechanism in this apparatus is based on a table 3 provided on the base 1 with a vacuum suction groove for fixing the cell substrate 2 of the solar battery and a drive mechanism 4 capable of moving the table 3 to an arbitrary position.
  • the head side system is composed of a driving mechanism 6 that supports the substrate side system and the coating head 5 with micro holes and can move in the vertical direction to set the gap between the coating head 5 and the solar cell substrate 2.
  • the two systems are relative to each other by a portal frame 7 fixed on the base 1. That is, the entire head side system is fixed to the portal frame 7, and is configured to face the substrate side system fixed on the base 1.
  • a liquid supply system including a liquid feed pump 9 for supplying the coating solution from the coating solution tank 8 to the coating head 5 is combined to form a solar cell collector electrode forming apparatus.
  • the table 3 for fixing the cell substrate 2 has a groove formed on the surface so that the back surface of the substrate is adsorbed by the vacuum pump 10, and generates and fixes a negative pressure.
  • lift pins for lifting the substrate are incorporated for removing the cell substrate 2 after the electrodes are formed. This operation is usually performed using air pressure.
  • an important element part in this apparatus is a liquid feed pump 9.
  • various types of pumps and the required performance item is that they are excellent in quantitativeness.
  • the electrode coating solution for solar cells generally has a high viscosity in order to increase the aspect ratio of the electrode cross-sectional shape as much as possible. Therefore, when the coating solution is discharged from the fine discharge nozzle hole 11, a large flow frictional resistance is generated, and the pressure in the coating head 5 is inevitably increased. Therefore, a high discharge pressure pump is required.
  • a bellows pump, a gear pump, or the like is applied, but a screw pump that is a rotary type and can be rotated forward and backward is suitable for intermittent application with application start and end.
  • the finger electrode forming operation of this device will be described.
  • the gap between the cell substrate 2 and the coating head 5 is set constant, and then coating is performed while moving the substrate side system. .
  • the head side system is fixed and the substrate side system moves.
  • the substrate side may be fixed and the head side may move.
  • the coating solution serving as the electrode material is sent to the coating head 5 by the liquid feed pump 9 and discharged from the minute discharge nozzle holes 11 positioned accurately at the finger electrode formation position.
  • various controls are mainly performed on the discharge flow rate of the liquid feeding pump 9.
  • FIG. 4 shows an example of the structure of the coating head 5.
  • This coating head is an example manufactured by wire electric discharge machining.
  • the coating head 5 is composed of three plates. That is, the nozzle plate 12 a including a plurality of narrow discharge nozzle holes 11, the cover plate 13 a that closes the discharge nozzle holes 11, and the nozzle plate 12 a, and the cavity 14 that functions as a tank that stores a coating solution from the liquid feed pump 9.
  • These are the three plates of the sealing plate 15 that serves to block the water.
  • the nozzle plate 12a and the sealing plate 15 may be integrated in structure, but when processing the discharge nozzle hole array 11 by wire electric discharge machining, it is necessary to open the ceiling portion of the cavity 14 as a wire passage, Inevitably, it has a three-body structure.
  • the end face of the nozzle plate 12a is cut with a wire having a constant thickness, and the degree of the long hole is determined by the cutting depth.
  • the shape of the discharge nozzle hole 11 is a long hole, and it is the first, second, and third aspects of the present invention that the direction of the long axis coincides with the application direction of the finger electrode to be applied.
  • FIG. 5 shows an example of another structure of the coating head 5.
  • This coating head is an example manufactured by laser processing.
  • the coating head 5 is composed of three plates. That is, a nozzle plate 12b including a plurality of narrow discharge nozzle holes 11, a cover plate 13b, and a cover plate 13c including the cavity 14.
  • a nozzle plate 12b including a plurality of narrow discharge nozzle holes 11, a cover plate 13b, and a cover plate 13c including the cavity 14.
  • an ellipse is pierced by a laser at a right angle to the longitudinal direction of the nozzle plate 12b.
  • a YAG laser is used as a processing machine although it depends on the material of the target nozzle plate 12b.
  • the joint surface between the nozzle plate 12b and the two cover plates 13b and 13c does not have a great influence on the increase in internal pressure accompanying the flow of the coating solution, whereas in the structure of FIG. Since the nozzle plate 12a and the cover plate 13a are deformed so as to open their mouths against the internal pressure, the coating head structure of FIG. 5 is superior in terms of the sealing performance of the coating solution.
  • the collector electrode formation by the discharge nozzle hole 11 having a long hole cross section as shown here corresponds to Claims 1, 2 and 3 of the present invention.
  • the dispenser cannot discharge.
  • the dispenser is not suitable when the electrode width is narrow and the aspect ratio of the electrode cross section is to be increased, as in the case of the finger electrode formation of the solar cell that is the subject of the present invention.
  • the long axis of the discharge nozzle hole 11 coincides with the application direction. Further, depending on the physical properties of the coating material, particularly the viscosity, it may be a circular hole or a square instead of a long hole.
  • the pressure applied to the coating solution in the coating head 5 can be reduced by the cross-sectional shape of the long hole of the discharge nozzle hole 11 and brings about a good result in the shape of the formed electrode.
  • a width is required.
  • the discharge direction of the coating solution discharged from the nozzle is perpendicular to the substrate surface.
  • the substrate surface responds like a wall to the flow of the coating solution, and a so-called “jet” phenomenon occurs in the so-called hydrodynamic world. That is, after the coating solution collides with the wall, a velocity vector in all directions along the wall is generated and diffused. This is a behavior contrary to the purpose of narrowing the finger electrode.
  • the discharge direction of the coating solution from the coating head 5 is tilted with respect to the coating direction. It is effective.
  • the coating head 5 is tilted with respect to the substrate surface 2 here, as shown in FIG. 7C, the coating head 5 is kept upright as in the past, and the discharge nozzle holes in the coating head 5 are disposed. 11 may be inclined.
  • the collision energy of the coating solution can be mitigated, and only the velocity vector in the direction opposite to the coating direction can be obtained, which is extremely effective for narrowing the electrode width.
  • Embodiments 4 and 5 of the present invention correspond to the apparatus and method, respectively.
  • the cell substrate 2 of the crystalline solar cell that currently occupies most of the solar cell is usually made of a silicon wafer having a substantially circular shape, and has a rectangular shape as shown in FIG. As shown in FIG.
  • the finger electrodes 16 are formed in a straight line with a constant interval. However, in the above-described notch portion, the electrode length becomes shorter toward the outside of the wafer, and becomes a constant length in the central portion. Next, a mechanism corresponding to the application length of the finger electrode that is changed stepwise will be described.
  • FIG. 8 shows a structure for changing the coating length of the finger electrode 16.
  • the center of the coating head is a discharge nozzle hole 11, and a predetermined number of discharge nozzle holes 11 having a long cross-sectional shape are formed at predetermined intervals.
  • the slide valve 17 In the common flow path for supplying the coating solution to the discharge nozzle hole 11, there is a slide valve 17 that can move to the left and right, and the mechanism can move around the coating material supply port 18. That is, the slide valve is a piston-like valve that covers the cross section of the common flow path, has a role of closing the discharge nozzle hole 11, and cannot discharge when it is on the discharge flow path 23.
  • This slide valve 17 is a mechanism that moves left and right by a connected arm 21 from the drive of a symmetrical trapezoidal screw 20 attached to the coating head 5 via a linear guide 19.
  • the trapezoidal screw 20 is driven by a servo motor. As a result, patterning at the notch portion of the solar cell substrate becomes possible.
  • FIGS. This figure shows the coating procedure when the coating length of the electrode changes at the notch as shown in FIG.
  • the coating head 5 descends, sets a predetermined gap with the cell substrate 2, supplies a coating solution, moves the table 3 on which the cell substrate 2 is mounted, Start application.
  • the interval between the slide valves 17 is a substrate width which is not affected by the notch in the central portion.
  • the slide valve 17 is gradually moved to the left and right, and the number of drawn electrodes is sequentially increased. From the drawing of all the lines, the ejection becomes stable and continues until it hits the notch portion of the cell substrate 2.
  • FIG. 8 shows a structure in which the coating solution is put from the center of the coating head 5, but depending on the configuration of the head, it is not possible to put it from the center, but it must be put from both ends or one end of the coating head 5 There is.
  • the configuration in this case is shown in FIG.
  • a hollow piston-like slide valve is used. 17a is used, and the flow path to the discharge nozzle hole is closed by the outer wall surface of the cylinder.
  • Both the parts 22 and 24 are formed with a stacking bolt hole 25 and a coating solution supply channel hole 26 for stacking at a common position.
  • the pipe 27 for supplying the coating solution and the pipe 28 for discharging are connected to both sides, and the base of the stacking bolt 29 End plates 30 and 31 are attached.
  • the stacking bolt 29 is tightened to complete the assembly of the multilayer coating head.
  • the fourteenth aspect of the present invention relates to a method of manufacturing the coating head 5 by a conventional processing technique of cutting and grinding.
  • the target coating head 5 is required to have the same dimensions and accuracy as the inkjet head.
  • the coating solution to be coated is limited to an extremely low viscosity of about 10 mPa ⁇ s by inkjet coating, whereas the coating head 5 of the present invention discharges a coating solution having a viscosity of 100,000 mPa ⁇ s or more.
  • the problem of clogging of the nozzle holes which is also a problem during ink jet coating, becomes a major issue in terms of reliability.
  • the integrated coating head 5 made of a laser cord or the like is difficult to recover from clogging with respect to the fine ejection nozzle hole 11, and if the recovery cannot be performed, the entire coating head 5 must be replaced.
  • clogging occurs in the multilayer coating head 5 shown in FIG. 11, it is immediately decomposed and can be easily recovered by cleaning the individual thin layer spacers 24 and the individual blocks 22. . That is, as a method for cleaning one flat plate is extremely easy, clogging is eliminated in most cases. If the thin spacer 24 is damaged due to an error in handling such as a cleaning process, the original state can be recovered by replacing only one sheet.
  • the finger electrodes formed on the solar cell substrate can be thinned and the cross-sectional aspect ratio can be increased.
  • the photoelectric conversion efficiency is improved and an effective solar cell system can be provided.
  • a solar cell collecting electrode forming apparatus can be provided at low cost, and a stable and highly reliable process can be provided.
  • the present invention solves the above-mentioned problems and at the same time forms a finger electrode having a narrow width and a high cross-sectional aspect ratio, and can provide a highly reliable electrode forming apparatus, while at the same time providing a higher photoelectric efficiency. This also leads to the realization of a solar cell that achieves conversion efficiency.

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Abstract

[Problème] L'invention vise un dispositif de formation servant à former directement une électrode en forme de doigt sur un substrat de cellule en utilisant une tête de revêtement ayant une pluralité de trous de buses pour décharger un matériau d'électrode en forme de doigt pour cellule solaire comme liquide de revêtement ; un procédé de formation ; et une tête de revêtement qui a une excellente productivité, est économique, est très fiable et permet une application dans d'autres domaines. [Solution] L'invention concerne un dispositif de formation servant à former une électrode collectrice, spécifiquement une électrode en forme de doigt, servant à collecter un porteur de charge photogénéré sur la surface d'incidence de lumière d'une unité de conversion photoélectrique servant à générer un porteur de charge photogénéré en utilisant l'incidence de la lumière solaire, un motif d'électrode étant dessiné par pression de pompe d'alimentation de liquide au moyen d'une tête de revêtement comportant une pluralité de trous de buses servant à décharger un matériau d'électrode comme liquide de revêtement. Pour réaliser l'objectif d'augmentation de l'aire de la surface d'incidence de lumière et de réduction de la résistance d'interconnexion de métal, la largeur d'électrode est réduite et le rapport longueur-largeur de la section transversale de l'électrode est augmenté. Il est ainsi possible de réduire l'énergie d'impact au moment de la décharge, d'obtenir le motif d'électrode désiré et de réaliser un système de cellule solaire ayant un rendement de conversion photoélectrique amélioré, en utilisant une tête de revêtement à buse à trou long et en inclinant le canal de décharge dans la direction du revêtement sur le substrat de cellule.
PCT/JP2010/073685 2010-12-27 2010-12-28 Dispositif et procédé de formation d'électrode collectrice pour cellule solaire et tête de revêtement Ceased WO2012090293A1 (fr)

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JP2010-290304 2010-12-27
JP2010290304 2010-12-27

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WO2012090293A1 true WO2012090293A1 (fr) 2012-07-05

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CN111359843A (zh) * 2020-04-14 2020-07-03 姜伟 一种光学数位转换器点胶装置

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TWI624307B (zh) * 2013-11-06 2018-05-21 All Ring Tech Co Ltd Carrier transfer method and device

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CN111359843A (zh) * 2020-04-14 2020-07-03 姜伟 一种光学数位转换器点胶装置
CN111359843B (zh) * 2020-04-14 2021-08-13 姜伟 一种光学数位转换器点胶装置

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