TWI496302B - Solar cell - Google Patents
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- TWI496302B TWI496302B TW102103693A TW102103693A TWI496302B TW I496302 B TWI496302 B TW I496302B TW 102103693 A TW102103693 A TW 102103693A TW 102103693 A TW102103693 A TW 102103693A TW I496302 B TWI496302 B TW I496302B
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- 239000000758 substrate Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
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- 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
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Description
本發明是有關於一種太陽能電池，特別是有關於一種可減少指狀電極傳輸電子時功率流失的太陽能電池。The present invention relates to a solar cell, and more particularly to a solar cell capable of reducing power loss when a finger electrode transmits electrons.
隨著石油價格的一再攀升以及環保意識逐漸的抬頭，人們積極地尋找及開發替代的能源。其中，太陽能的利用為最主要的技術發展方向。As oil prices continue to rise and environmental awareness rises, people are actively looking for and developing alternative energy sources. Among them, the use of solar energy is the most important technology development direction.
太陽能電池最基本的結構可分為N型與P型半導體層、抗反射層(anti-reflection layer)及金屬電極等三個主要部份。其中，N型與P型半導體層是光伏特效應的來源；抗反射層乃用於減少入射光的反射以增強電流；金屬電極則是用來連接元件和外部負載。太陽能電池的各個構件都具有繁複之製程，其製程方法之成效影響著太陽能轉換為電能的轉換效率，而能否提高光電轉換效率以降低太陽能電池的產電成本是影響太陽能產業的發展的關鍵因素。因此，業界注入龐大的資金以及人力去研究太陽能電池之製程方法，以期獲得較高之光電轉換效能。The most basic structure of a solar cell can be divided into three main parts: an N-type and a P-type semiconductor layer, an anti-reflection layer, and a metal electrode. Among them, the N-type and P-type semiconductor layers are the source of photovoltaic special effects; the anti-reflection layer is used to reduce the reflection of incident light to enhance the current; the metal electrode is used to connect components and external loads. Each component of the solar cell has a complicated process, and the effectiveness of the process method affects the conversion efficiency of solar energy into electrical energy, and whether the photoelectric conversion efficiency can be improved to reduce the power generation cost of the solar cell is a key factor affecting the development of the solar energy industry. . Therefore, the industry has injected huge capital and manpower to study the process methods of solar cells in order to obtain higher photoelectric conversion performance.
請參閱第1圖及第2圖，其係為習知太陽能電池之上視圖及局部放大示意圖。習知太陽能電池包含具有受光面46之電池本體44以及位於電池本體44上之匯流電極(bus electrode)40及指狀電極(finger electrode)42。如 第1圖及第2圖所示，習知的太陽能電池其指狀電極42係以寬度W4朝遠離匯流電極40之方向等寬地延伸。並且，電子藉由指狀電極42匯集到匯流電極40，並藉由匯流電極40匯出至外部負載。影響太陽能電池光電轉換效率的因素除了金屬電極於太陽能電池上的遮蔽率外，金屬電極中指狀電極的形貌亦扮演著重要的角色。由於在進行電子傳輸的過程中，隨著傳輸路徑地增加，指狀電極傳輸電子的電荷累積量亦隨之增加，因此不僅造成接近匯流電極處之指狀電極的電阻上升，不利於指狀電極傳輸電子，同時也增加指狀電極之功率流失(power loss)量，進而影響太陽能電池之光電轉換效率。Please refer to FIG. 1 and FIG. 2 , which are top view and partial enlarged view of a conventional solar cell. A conventional solar cell includes a battery body 44 having a light receiving surface 46 and a bus electrode 40 and a finger electrode 42 on the battery body 44. Such as As shown in FIGS. 1 and 2, in the conventional solar cell, the finger electrodes 42 extend in the width W4 in the same direction away from the bus electrode 40. Further, electrons are collected by the finger electrode 42 to the bus electrode 40, and are discharged to the external load by the bus electrode 40. Factors affecting the photoelectric conversion efficiency of solar cells In addition to the shielding rate of metal electrodes on solar cells, the shape of the finger electrodes in metal electrodes also plays an important role. Since the charge accumulation amount of the electrons transmitted by the finger electrodes increases as the transmission path increases during the electron transfer process, not only the resistance of the finger electrodes near the bus electrodes is increased, but also the finger electrodes are disadvantageous. The transmission of electrons also increases the power loss of the finger electrodes, which in turn affects the photoelectric conversion efficiency of the solar cells.
有鑑於上述習知技藝之問題，本發明之其中一目的就是在提供一種太陽能電池，藉以在指狀電極的面積相同於習知太陽能電池之指狀電極之條件下，經由改良指狀電極的形貌，而達到減低接近匯流電極處之指狀電極的電阻以及達到降低指狀電極的功率流失量之目的。In view of the above problems of the prior art, it is an object of the present invention to provide a solar cell whereby the shape of the finger electrode is improved under the condition that the area of the finger electrode is the same as that of the conventional solar cell. The appearance is achieved by reducing the resistance of the finger electrode near the bus electrode and reducing the power loss of the finger electrode.
為達前述目的，本發明提出一種太陽能電池，其可減低接近匯流電極處之指狀電極的電阻以及降低指狀電極的功率流失量，因此可藉以提升太陽能電池之光電轉換效率。In order to achieve the foregoing object, the present invention provides a solar cell which can reduce the resistance of the finger electrode near the bus electrode and reduce the power loss of the finger electrode, thereby improving the photoelectric conversion efficiency of the solar cell.
本發明之太陽能電池，至少包含具有受光面之基板、配置於受光面上之匯流電極(bus electrode)以及複數 個指狀電極(finger electrode)。本發明之太陽能電池之電極結構可為網印印刷電極或電鍍電極。上述複數個指狀電極係與匯流電極垂直地連接，且每一指狀電極包含電性相連接之第一電極部及第二電極部，其中第一電極部之寬度與第二電極部之寬度相同，且第二電極部具有至少兩個延伸電極部及位於延伸電極部之間之至少一缺口，缺口從第二電極部之第一端朝遠離匯流電極之方向延伸至第二電極部之第二端，其中第一電極部之第二端連接至第二電極部之第一端，第一電極部之第一端連接至匯流電極，第二電極部之第二端朝遠離匯流電極之方向延伸。The solar cell of the present invention includes at least a substrate having a light receiving surface, a bus electrode disposed on the light receiving surface, and a plurality of bus electrodes Finger electrodes. The electrode structure of the solar cell of the present invention may be a screen printing electrode or a plating electrode. The plurality of finger electrodes are vertically connected to the bus electrode, and each of the finger electrodes includes an electrically connected first electrode portion and a second electrode portion, wherein a width of the first electrode portion and a width of the second electrode portion Similarly, the second electrode portion has at least two extended electrode portions and at least one notch between the extended electrode portions, and the notch extends from the first end of the second electrode portion away from the bus electrode to the second electrode portion a second end, wherein the second end of the first electrode portion is connected to the first end of the second electrode portion, the first end of the first electrode portion is connected to the bus electrode, and the second end of the second electrode portion is away from the bus electrode extend.
根據本發明之太陽能電池之第一實施例之第一態樣，本發明之第二電極部之缺口形狀為矩形。According to a first aspect of the first embodiment of the solar cell of the present invention, the notch shape of the second electrode portion of the present invention is a rectangle.
根據本發明之太陽能電池之第一實施例之第二態樣，本發明之第二電極部之缺口形狀為三角形。According to a second aspect of the first embodiment of the solar cell of the present invention, the second electrode portion of the present invention has a notch shape in a triangular shape.
根據本發明之太陽能電池之第一實施例之第三態樣，本發明之第二電極部之缺口形狀為梯形。According to the third aspect of the first embodiment of the solar cell of the present invention, the second electrode portion of the present invention has a trapezoidal shape in a trapezoidal shape.
根據本發明之太陽能電池之第一實施例之第四態樣，本發明之第一電極部之長度與第二電極部之長度相等。According to a fourth aspect of the first embodiment of the solar cell of the present invention, the length of the first electrode portion of the present invention is equal to the length of the second electrode portion.
根據本發明之太陽能電池之第一實施例之第五態樣，本發明之第二電極部之缺口長度不大於每一指狀電極之長度的一半。According to a fifth aspect of the first embodiment of the solar cell of the present invention, the second electrode portion of the present invention has a notch length of not more than half the length of each of the finger electrodes.
根據本發明之太陽能電池之第一實施例之第六態 樣，本發明之指狀電極係等距地垂直於匯流電極，且指狀電極之間距介於1.5mm至2.0mm之間。Sixth state of the first embodiment of the solar cell according to the present invention As such, the finger electrodes of the present invention are equidistantly perpendicular to the bus electrodes, and the distance between the finger electrodes is between 1.5 mm and 2.0 mm.
根據本發明之太陽能電池之第一實施例之第七態樣，本發明之第一電極部之寬度係為延伸電極部之寬度的2至6倍。According to a seventh aspect of the first embodiment of the solar cell of the present invention, the width of the first electrode portion of the present invention is 2 to 6 times the width of the extended electrode portion.
根據本發明之太陽能電池之第一實施例之第八態樣，本發明之延伸電極部更包含至少一另一缺口，此另一缺口自延伸電極部之一端延伸至第二電極部之第二端。According to the eighth aspect of the first embodiment of the solar cell of the present invention, the extended electrode portion of the present invention further comprises at least one other notch extending from one end of the extended electrode portion to the second portion of the second electrode portion end.
根據本發明之太陽能電池之第二實施例，本發明之太陽能電池之第二電極部與另一太陽能電池之第二電極部電性連接，且這兩個太陽能電池之構造相同。According to a second embodiment of the solar cell of the present invention, the second electrode portion of the solar cell of the present invention is electrically connected to the second electrode portion of the other solar cell, and the two solar cells are constructed identically.
根據本發明之太陽能電池之第三實施例，本發明之太陽能電池更包含一導線電性連接太陽能電池之匯流電極以構成太陽能電池模組。According to a third embodiment of the solar cell of the present invention, the solar cell of the present invention further comprises a wire electrically connected to the bus electrode of the solar cell to constitute the solar cell module.
承上所述，依本發明之太陽能電池，其可具有一或多個下述優點：In view of the above, a solar cell according to the present invention may have one or more of the following advantages:
(1)本發明之太陽能電池，藉由改良指狀電極之形貌，可減低接近匯流電極處之指狀電極的電阻並降低指狀電極的功率流失量。(1) In the solar cell of the present invention, by improving the morphology of the finger electrode, the resistance of the finger electrode near the bus electrode can be reduced and the power loss of the finger electrode can be reduced.
(2)本發明之太陽能電池，藉由改良指狀電極之形貌，可提升太陽能電池之光電轉換效率。(2) The solar cell of the present invention can improve the photoelectric conversion efficiency of the solar cell by improving the morphology of the finger electrode.
請參閱第3圖，其係為本發明之太陽能電池之第一實施例之上視圖。如第3圖所示，本發明之太陽能電池100至少包含具有受光面50之基板、匯流電極10以及複數個指狀電極20，且指狀電極20係例如實質上與匯流電極10垂直地電性連接。其中，基板之受光面50用以將太陽能轉換成電能。此外，為避免太陽能電池中的指狀電極因斷線或其他因素造成指狀電極無法順利將電子傳輸至匯流電極之問題。因此，如第3圖所示，本發明更可依據實際需求而於太陽能電池100之外部圍繞一周邊電極30。由於周邊電極30係電性連接指狀電極20及匯流電極10，故可避免因指狀電極20無法順利傳輸電子，而影響太陽能電池100之光電轉換效率。此外，本發明之太陽能電池100中匯流電極10以及指狀電極20可依據實際需求為網印印刷法製得之網印印刷電極或電鍍製程製得之電鍍電極。Please refer to FIG. 3, which is a top view of a first embodiment of a solar cell of the present invention. As shown in FIG. 3, the solar cell 100 of the present invention includes at least a substrate having a light receiving surface 50, a bus electrode 10, and a plurality of finger electrodes 20, and the finger electrodes 20 are, for example, substantially perpendicular to the bus electrodes 10. connection. The light receiving surface 50 of the substrate is used to convert solar energy into electrical energy. In addition, in order to prevent the finger electrodes in the solar cell from being broken due to disconnection or other factors, the finger electrodes cannot smoothly transmit electrons to the bus electrodes. Therefore, as shown in FIG. 3, the present invention can surround a peripheral electrode 30 outside the solar cell 100 according to actual needs. Since the peripheral electrode 30 is electrically connected to the finger electrode 20 and the bus electrode 10, it is possible to avoid that the finger electrode 20 cannot smoothly transmit electrons, thereby affecting the photoelectric conversion efficiency of the solar cell 100. In addition, in the solar cell 100 of the present invention, the bus electrode 10 and the finger electrode 20 can be screen printed electrodes prepared by screen printing or electroplated electrodes prepared by electroplating according to actual needs.
請參閱第4圖，其係繪示第3圖中本發明之太陽能電池的局部放大示意圖。如第4圖所示，指狀電極20係與匯流電極10垂直地連接，且每一指狀電極20包含電性相連接之第一電極部201及第二電極部202。其中，第一電極部201之寬度W1與第二電極部202之寬度W2相同，且第二電極部202具有至少兩個延伸電極部206及位於延伸電極部206之間之至少一缺口204，缺口204從第二電極部之第一端209朝遠離匯流電極10之方向延伸至第二電極部之第二端210，其中第一電極部之第二 端208連接至第二電極部之第一端209，第一電極部201之第一端207連接至匯流電極10，第二電極部202之第二端210朝遠離匯流電極10之方向延伸。Please refer to FIG. 4, which is a partially enlarged schematic view showing the solar cell of the present invention in FIG. As shown in FIG. 4, the finger electrodes 20 are perpendicularly connected to the bus electrode 10, and each of the finger electrodes 20 includes a first electrode portion 201 and a second electrode portion 202 that are electrically connected. The width W1 of the first electrode portion 201 is the same as the width W2 of the second electrode portion 202, and the second electrode portion 202 has at least two extended electrode portions 206 and at least one notch 204 between the extended electrode portions 206. 204 extends from the first end 209 of the second electrode portion toward the direction away from the bus electrode 10 to the second end 210 of the second electrode portion, wherein the second electrode portion is second The end 208 is connected to the first end 209 of the second electrode portion. The first end 207 of the first electrode portion 201 is connected to the bus electrode 10, and the second end 210 of the second electrode portion 202 extends away from the bus electrode 10.
請繼續參閱第5圖及第6圖，其係繪示本發明之太陽能電池中指狀電極之缺口態樣示意圖。如第4圖至第6圖所示，本發明之太陽能電池中缺口204的形狀可為矩形、三角形或梯形。Please refer to FIG. 5 and FIG. 6 , which are schematic diagrams showing the notch state of the finger electrodes in the solar cell of the present invention. As shown in FIGS. 4 to 6, the shape of the notch 204 in the solar cell of the present invention may be rectangular, triangular or trapezoidal.
在指狀電極的面積相同於習知指狀電極之條件下，本發明藉由改良太陽能電池之電極結構中指狀電極的形貌，可達到減低接近匯流電極處之指狀電極的電阻以及達到降低指狀電極的功率流失量之目的。Under the condition that the area of the finger electrode is the same as that of the conventional finger electrode, the invention can reduce the resistance of the finger electrode near the bus electrode and reduce the shape by improving the shape of the finger electrode in the electrode structure of the solar cell. The purpose of the power loss of the finger electrodes.
舉例而言，在本發明太陽能電池之電極結構中，第一電極部201的長度L1可與第二電極部202的長度L2相等。或者，第二電極部202之缺口204的長度L3不大於每一指狀電極20之長度L5的一半。此外，在本發明之電極結構中，彼此相鄰之指狀電極20係以間距d等距地垂直於匯流電極10，且指狀電極20之間距d可介於1.5mm至2.0mm之間。除此之外，本發明之太陽能電池的第一電極部201之寬度W1可為延伸電極部206之寬度W3的2至6倍。For example, in the electrode structure of the solar cell of the present invention, the length L1 of the first electrode portion 201 may be equal to the length L2 of the second electrode portion 202. Alternatively, the length L3 of the notch 204 of the second electrode portion 202 is not more than half the length L5 of each of the finger electrodes 20. Further, in the electrode structure of the present invention, the finger electrodes 20 adjacent to each other are perpendicular to the bus electrode 10 at a pitch d equidistant, and the distance d between the finger electrodes 20 may be between 1.5 mm and 2.0 mm. In addition, the width W1 of the first electrode portion 201 of the solar cell of the present invention may be 2 to 6 times the width W3 of the extended electrode portion 206.
如第7圖所示，本發明之太陽能電池中第二電極部202之延伸電極部206中更可包含至少一缺口212，以提高太陽能電池中指狀電極的電子傳輸能力，其中此缺口212自延伸電極部之一端211延伸至第二電極部之第二 端210。As shown in FIG. 7, the extended electrode portion 206 of the second electrode portion 202 of the solar cell of the present invention may further include at least one notch 212 for improving the electron transporting capability of the finger electrode in the solar cell, wherein the notch 212 is self-extended. One end 211 of the electrode portion extends to the second end of the second electrode portion End 210.
此外，本發明之太陽能電池100之電極結構更可將相鄰之指狀電極20彼此電性連接。如第8圖所示，在本發明之太陽能電池的第二實施例中，第二電極部202與另一太陽能電池電極結構之第二電極部202電性連接，且這兩個太陽能電池100電極結構之構造相同。本發明第二實施例與第一實施例差異之處僅在於，第二實施例太陽能電池電極結構之第二電極部與另一太陽能電池電極結構之第二電極部電性連接。此外，如第8圖所示，本發明之太陽能電池電極結構之第二實施例如同第一實施例，可依據實際需求而於太陽能電池電極結構之外部圍繞一周邊電極30，以避免太陽能電池電極結構中的指狀電極因斷線或其他因素，造成指狀電極無法順利將電子傳輸至匯流電極之問題。In addition, the electrode structure of the solar cell 100 of the present invention can electrically connect the adjacent finger electrodes 20 to each other. As shown in FIG. 8, in the second embodiment of the solar cell of the present invention, the second electrode portion 202 is electrically connected to the second electrode portion 202 of the other solar cell electrode structure, and the two solar cell 100 electrodes are The structure is the same. The second embodiment of the present invention differs from the first embodiment only in that the second electrode portion of the solar cell electrode structure of the second embodiment is electrically connected to the second electrode portion of the other solar cell electrode structure. In addition, as shown in FIG. 8, the second embodiment of the solar cell electrode structure of the present invention, as in the first embodiment, can surround a peripheral electrode 30 outside the solar cell electrode structure according to actual needs, thereby avoiding solar cell electrodes. The finger electrodes in the structure are caused by wire breakage or other factors, causing the problem that the finger electrodes cannot smoothly transmit electrons to the bus electrodes.
在本發明之太陽能電池之第三實施例中，更包含導線電性連接太陽能電池之匯流電極以構成太陽能電池模組。此外，每一太陽能電池模組更可視實際需求而與另一太陽能電池模組彼此串接，如第9圖所示，太陽能電池模組62藉由導線60連接另一太陽能電池模組62之匯流電極10(為求圖式簡潔，第9圖中未繪示)，且太陽能電池模組62與另一太陽能電池模組62之構造相同。藉由彼此串接太陽能電池模組62可提高太陽能電池光電轉換之傳輸效率。In a third embodiment of the solar cell of the present invention, the wire further electrically connects the bus electrode of the solar cell to form a solar cell module. In addition, each solar cell module can be connected to another solar cell module in series according to actual needs. As shown in FIG. 9, the solar cell module 62 is connected to another confluence of the solar cell module 62 by the wire 60. The electrode 10 (not shown in FIG. 9 for simplicity of the drawing), and the solar cell module 62 has the same configuration as the other solar cell module 62. The transmission efficiency of the solar cell photoelectric conversion can be improved by connecting the solar cell modules 62 to each other.
功率流失量比較： 由於太陽能電池中電極結構(例如匯流電極及指狀電極)的材料一般選用鎳、銀、鋁、銅及鈀等金屬的搭配組合，金屬材料之電極結構於太陽能電池上覆蓋的表面積會遮蔽太陽的入射光，因此金屬電極覆蓋於太陽能電池上的表面積對於太陽能電池的光電轉換效率極為重要。Comparison of power loss: Since the materials of the electrode structures (for example, the bus electrodes and the finger electrodes) in the solar cell are generally selected from a combination of metals such as nickel, silver, aluminum, copper, and palladium, the surface area of the electrode structure of the metal material covers the sun. Incident light, therefore the surface area of the metal electrode overlying the solar cell is extremely important for the photoelectric conversion efficiency of the solar cell.
此外，為了瞭解相較於習知太陽能電池之電極結構，本發明之太陽能電池之指狀電極結構改善指狀電極之功率流失量的程度。因此，本發明係在本發明之太陽能電池之電極結構以及習知太陽能電池之電極結構，兩者的指狀電極具有相同之面積之條件下進行比較。Further, in order to understand the electrode structure of the solar cell of the present invention, the degree of power loss of the finger electrode is improved in comparison with the electrode structure of the conventional solar cell. Therefore, the present invention is based on the electrode structure of the solar cell of the present invention and the electrode structure of the conventional solar cell, in which the finger electrodes of the two have the same area.
太陽能電池之電極結構中指狀電極的功率流失量可經下列公式(1)計算而得：
其中x表示指狀電極積分之長度，J表示最大功率點之電流量，S表示指狀電極彼此間之間距，ρ 表示指狀電極材料的電阻率，W表示指狀電極之寬度，h表示指狀電極之高度，dx表示每一小單位指狀電極之長度。上述公式(1)表示將指狀電極自長度0積分至長度L所得之功率流失量。Where x is the length of the integral of the finger electrode, J is the amount of current at the maximum power point, S is the distance between the finger electrodes, ρ is the resistivity of the finger electrode material, W is the width of the finger electrode, and h is the index The height of the electrode, dx, represents the length of each small unit of finger electrodes. The above formula (1) represents the power loss amount obtained by integrating the finger electrodes from the length 0 to the length L.
請一併參閱第2圖及第4圖：如第2圖所示，習知太陽能電池之電極結構中指狀電極42之長度為L4，而寬度為W4；而第4圖所示的本發明太陽能電池之電極結構，指狀電極之長度為L5，寬度為W1，且缺口之長 度L3為指狀電極之長度L5的一半。在本發明之電極結構與習知之電極結構，兩者的指狀電極皆具有相同面積之條件下，舉例來說，例如當兩者的指狀電極之長度相等(即指狀電極之長度L=L5=L4)且本發明電極結構中之指狀電極的寬度W1為延伸電極部的寬度W3的4倍(即W1=4W3)，則本發明電極結構中指狀電極之寬度W1為習知電極結構中指狀電極之寬度W4的4/3倍(即指狀電極之寬度W=W4，W1=4/3W4)。在本發明之電極結構與習知之電極結構的最大功率點之電流量J、指狀電極彼此間之間距S、指狀電極材料的電阻率ρ 、指狀電極之高度d皆相同之條件下，經上列公式(1)計算後可知，習知太陽能電池之電極結構，其指狀電極之功率流失量為(1/3)L3 J2 S2 ρ /(Wh)；而本發明太陽能電池之電極結構，其指狀電極之功率流失量為(1/3)L3 J2 S2 ρ /(Wh)*(99/128)。因此，本發明之太陽能電池之電極結構可有效減少指狀電極之功率流失量約22.66%。Please refer to FIG. 2 and FIG. 4 together. As shown in FIG. 2, in the electrode structure of the conventional solar cell, the length of the finger electrode 42 is L4 and the width is W4; and the solar energy of the invention shown in FIG. 4 The electrode structure of the battery, the length of the finger electrode is L5, the width is W1, and the length L3 of the notch is half of the length L5 of the finger electrode. In the electrode structure of the present invention and the conventional electrode structure, both of the finger electrodes have the same area, for example, for example, when the lengths of the finger electrodes of the two are equal (ie, the length of the finger electrode L = L5=L4) and the width W1 of the finger electrode in the electrode structure of the present invention is 4 times the width W3 of the extended electrode portion (ie, W1=4W3), and the width W1 of the finger electrode in the electrode structure of the present invention is a conventional electrode structure. The width of the middle finger electrode is 4/3 times (ie, the width of the finger electrode is W=W4, W1=4/3W4). Under the condition that the electrode structure of the present invention is the same as the current amount J of the maximum power point of the electrode structure, the distance between the finger electrodes S, the resistivity ρ of the finger electrode material, and the height d of the finger electrodes are the same, It can be seen from the calculation of the formula (1) above that the electrode structure of the conventional solar cell has a power loss of (1/3) L 3 J 2 S 2 ρ /(Wh); and the solar cell of the present invention In the electrode structure, the power loss of the finger electrode is (1/3) L 3 J 2 S 2 ρ /(Wh)*(99/128). Therefore, the electrode structure of the solar cell of the present invention can effectively reduce the power loss of the finger electrode by about 22.66%.
使用者可視實際需求調整電極結構之指狀電極之長度或寬度，且由本發明之研究顯現，藉由本發明改良之太陽能電池之電極結構，可減少指狀電極之功率流失量，因此，本發明之太陽能電池可有效提高太陽能電池之光電轉換效率。The length or width of the finger electrode of the electrode structure can be adjusted according to actual needs, and it can be seen from the research of the present invention that the electrode structure of the solar cell improved by the invention can reduce the power loss of the finger electrode, and therefore, the invention Solar cells can effectively improve the photoelectric conversion efficiency of solar cells.
以上所述僅為舉例性，而非為限制性者。任何未脫離本發明之精神與範疇，而對其進行之等效修改或變更，均應包含於後附之申請專利範圍中。The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.
100‧‧‧太陽能電池100‧‧‧ solar cells
30‧‧‧周邊電極30‧‧‧ peripheral electrodes
50、46‧‧‧受光面50, 46‧‧‧ light surface
10、40‧‧‧匯流電極10, 40‧‧‧ bus electrode
20、42‧‧‧指狀電極20, 42‧‧‧ finger electrodes
44‧‧‧電池本體44‧‧‧ battery body
201‧‧‧第一電極部201‧‧‧First electrode section
202‧‧‧第二電極部202‧‧‧Second electrode section
W1、W2、W3、W4‧‧‧寬度W1, W2, W3, W4‧‧‧ width
204、212‧‧‧缺口204, 212‧‧ ‧ gap
206‧‧‧延伸電極部206‧‧‧Extended electrode section
L1、L2、L3、L4、L5‧‧‧長度L1, L2, L3, L4, L5‧‧‧ length
d‧‧‧間距D‧‧‧ spacing
60‧‧‧導線60‧‧‧ wire
62‧‧‧太陽能電池模組62‧‧‧Solar battery module
207‧‧‧第一電極部之第一端207‧‧‧ first end of the first electrode
208‧‧‧第一電極部之第二端208‧‧‧second end of the first electrode
209‧‧‧第二電極部之第一端209‧‧‧ the first end of the second electrode
210‧‧‧第二電極部之第二端210‧‧‧ second end of the second electrode
211‧‧‧延伸電極部之一端211‧‧‧One end of the extension electrode
第1圖 係為習知太陽能電池之上視圖。Figure 1 is a top view of a conventional solar cell.
第2圖 係為第1圖中太陽能電池之局部放大示意圖。Fig. 2 is a partially enlarged schematic view showing the solar cell in Fig. 1.
第3圖 係為本發明之太陽能電池之第一實施例之上視圖。Figure 3 is a top view of a first embodiment of a solar cell of the present invention.
第4圖 係繪示第3圖中本發明之太陽能電池的局部放大示意圖。Fig. 4 is a partially enlarged schematic view showing the solar cell of the present invention in Fig. 3.
第5圖至第6圖 係繪示本發明之太陽能電池中指狀電極之缺口態樣示意圖。Fig. 5 to Fig. 6 are schematic views showing the notch state of the finger electrodes in the solar cell of the present invention.
第7圖 係為本發明之太陽能電池中延伸電極部更包含缺口之示意圖。Fig. 7 is a schematic view showing that the extending electrode portion of the solar cell of the present invention further includes a notch.
第8圖 係為本發明之太陽能電池之第二實施例之上視圖。Figure 8 is a top view of a second embodiment of the solar cell of the present invention.
第9圖 係為本發明之太陽能電池模組彼此串接之側視圖。Figure 9 is a side view showing the solar cell modules of the present invention connected in series.
100‧‧‧太陽能電池100‧‧‧ solar cells
10‧‧‧匯流電極10‧‧‧Concurrent electrode
20‧‧‧指狀電極20‧‧‧ finger electrode
50‧‧‧受光面50‧‧‧Glossy surface
30‧‧‧周邊電極30‧‧‧ peripheral electrodes
Claims (10)
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| JP2006107892A (en) * | 2004-10-04 | 2006-04-20 | Nippon Oil Corp | Electrode substrate having conductive pattern and solar cell |
| TWM387372U (en) * | 2010-03-29 | 2010-08-21 | Neo Solar Power Corp | Electrode structure of solar cell |
| CN102171837A (en) * | 2008-09-12 | 2011-08-31 | Lg化学株式会社 | Front electrode for solar cell which minimizes power loss, and solar cell including the same |
| CN102244116A (en) * | 2010-05-12 | 2011-11-16 | Lg电子株式会社 | Solar cell |
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| JP2006107892A (en) * | 2004-10-04 | 2006-04-20 | Nippon Oil Corp | Electrode substrate having conductive pattern and solar cell |
| CN102171837A (en) * | 2008-09-12 | 2011-08-31 | Lg化学株式会社 | Front electrode for solar cell which minimizes power loss, and solar cell including the same |
| TWM387372U (en) * | 2010-03-29 | 2010-08-21 | Neo Solar Power Corp | Electrode structure of solar cell |
| CN102244116A (en) * | 2010-05-12 | 2011-11-16 | Lg电子株式会社 | Solar cell |
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