Solar cell module manufacturing method and solar cell module
The method of laminating a photoelectric conversion layer with a perovskite compound and locally inactivating it using laser irradiation in solar cell modules addresses the challenge of uniform thickness and prevents short circuits, thereby reducing manufacturing costs.
Patent Information
- Application Number
- JP2023200435
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-11-28
- Publication Date
- 2025-06-09
AI Technical Summary
The challenge in manufacturing solar cell modules is forming a photoelectric conversion layer with uniform thickness, as coating methods often result in unstable film thickness at the ends, leading to potential short circuits and increased manufacturing costs.
A method involving the lamination of a first electrode layer, forming dividing grooves, and then laminating a photoelectric conversion layer containing a perovskite compound, followed by local inactivation of the layer using laser irradiation in colored regions, to prevent short circuits.
This approach effectively prevents short circuits in solar cell modules while reducing manufacturing costs, as the local inactivation of the photoelectric conversion layer eliminates the risk of non-uniform thickness causing electrical shorts.
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Abstract
Description
Technical Field
[0001] The present invention relates to a method for manufacturing a solar cell module and a solar cell module.
Background Art
[0002] A solar cell module formed by electrically connecting a plurality of solar cell sub-cells in series on a single substrate is known. By modularizing the solar cells, the effective area decreases because the area between the sub-cells becomes an ineffective area, but in particular, the resistance loss at the electrodes on the light-receiving surface side can be reduced. Therefore, if the solar cells are appropriately modularized, the effect of improving the photoelectric conversion efficiency due to the reduction of the resistance loss exceeds the reduction of the effective area.
[0003] A solar cell module including a plurality of sub-cells includes a step of laminating a first electrode layer on a substrate, a step of cutting the first electrode layer by a first laser irradiation, a step of laminating a photoelectric conversion layer, a step of cutting the photoelectric conversion layer by a second laser irradiation, a step of laminating a second electrode layer, and a step of cutting the second electrode layer by a third laser irradiation in this order, and by shifting the positions of the first laser irradiation, the second laser irradiation, and the third laser irradiation little by little in order, it can be manufactured by a method of forming a plurality of strip-shaped solar cell sub-cells electrically connected in series (see, for example, Patent Document 1).
Prior Art Documents
Patent Documents
[0004]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0005] A photoelectric conversion layer containing a perovskite compound is generally formed by coating. When forming the photoelectric conversion layer by coating, it is difficult to form a coating film with a uniform thickness up to the end of the substrate, so the film thickness at the end of the photoelectric conversion layer becomes unstable. If there is a break or insufficient film thickness in the photoelectric conversion layer, there is a risk of short circuit in the sub-cell. For this reason, both ends of the sub-cell are removed by, for example, etching to prevent short circuit of the sub-cell, but this leads to an increase in manufacturing cost.
[0006] Therefore, an object of the present invention is to provide a method for manufacturing a solar cell module and a solar cell module that can prevent short circuit.
Means for Solving the Problems
[0007] A method for manufacturing a solar cell module according to an aspect of the present invention includes a step of laminating a first electrode layer on a first side in the normal direction of a substrate formed in a sheet shape and having strip-shaped colored regions extending in a second plane direction intersecting the first plane direction at both ends in the first plane direction of the main surface on the first side in the normal direction; a step of forming a plurality of first dividing grooves extending in the first plane direction so as to divide the first electrode layer into a plurality of strips; a step of laminating a photoelectric conversion layer containing a perovskite compound on the first side in the normal direction of the first electrode layer in which the first dividing grooves are formed; a step of forming a plurality of second dividing grooves extending in the first plane direction so as to divide the photoelectric conversion layer into a plurality of strips; a step of laminating a second electrode layer on the first side in the normal direction of the photoelectric conversion layer in which the second dividing grooves are formed; a step of forming a plurality of third dividing grooves extending in the first plane direction so as to divide the second electrode layer into a plurality of strips; and a step of locally inactivating the photoelectric conversion layer by irradiating the colored region with a laser in a linear or strip shape extending in the second plane direction.
[0008] In the above-described method for manufacturing a solar cell module, the step of irradiating the laser may be performed after the step of laminating the photoelectric conversion layer and before the step of laminating the second electrode layer.
[0009] In the above method for manufacturing a solar cell module, the laser may be irradiated through the base material.
[0010] A solar cell module according to another aspect of the present invention includes a base material formed in a sheet shape, a first electrode layer laminated on a first side in the normal direction of the base material, a photoelectric conversion layer laminated on the first side in the normal direction of the first electrode layer and containing a perovskite compound, and a second electrode layer laminated on the first side in the normal direction of the photoelectric conversion layer. A plurality of first division grooves extending in a first plane direction are formed so as to divide the first electrode layer into a plurality of strips, a plurality of second division grooves extending in the first plane direction are formed so as to divide the photoelectric conversion layer into a plurality of strips, and a plurality of third division grooves extending in the first plane direction are formed so as to divide the second electrode layer into a plurality of strips. The base material has a strip-shaped colored region formed at both ends in the first plane direction of the main surface on the first side in the normal direction, and extends in a second plane direction intersecting the first plane direction. The photoelectric conversion layer has inactive regions that are continuously amorphized and extend in the second plane direction at both ends in the first plane direction overlapping the colored region.
Advantages of the Invention
[0011] According to the present invention, it is possible to provide a method for manufacturing a solar cell module and a solar cell module that can prevent short circuits at low cost.
Brief Description of the Drawings
[0012]
Figure 1
Figure 2
Figure 3
Figure 4
Embodiments for Carrying Out the Invention
[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings. For convenience, hatching, member reference numerals, etc. may be omitted, but in such cases, other drawings shall be referred to. Also, various members in the drawings have been adjusted such as changes in number, simplification, exaggeration, etc. for ease of viewing.
[0014] FIG. 1 is a schematic plan view of a solar cell module 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line X-X of the solar cell module 1 in FIG. 1. FIG. 3 is a cross-sectional view taken along the line Y-Y of the solar cell module 1 in FIG. 1.
[0015] The solar cell module 1 of the present embodiment includes a substrate 10 formed in a sheet shape, a first electrode layer 20, a first charge transport layer 30, a photoelectric conversion layer 40, a second charge transport layer 50, and a second electrode layer 60, in this order in the normal direction of the substrate 10. The solar cell module 1 of the present embodiment further includes a sheet-shaped back surface protective material 70 that covers the second electrode layer 60, and a sealing material 80 filled in the space between the substrate 10 and the back surface protective material 70. Although not shown, the solar cell module 1 may include additional functional layers such as a passivation layer and an antireflection layer in the interlayer or the outermost layer. The solar cell module 1 of the present embodiment is intended to convert the energy of light incident from the side of the substrate 10 into electric power.
[0016] Further, the solar cell module 1 has a plurality of first dividing grooves 91 that extend in a first plane direction parallel to the main surface of the substrate 10 and divide the first electrode layer 20 into strips, a plurality of second dividing grooves 92 that divide the photoelectric conversion layer 40 into strips, and a plurality of third dividing grooves 93 that divide at least the second electrode layer 60 into strips and do not divide the first electrode layer 20. The first dividing grooves 91, the second dividing grooves 92, and the third dividing grooves 93 are provided at equal intervals and close to each other, arranged in a second plane direction intersecting the first plane direction, and define a plurality of sub-cell portions 2 that are electrically connected in series and electrode portions 3 at both ends.
[0017] The substrate 10 supports a photoelectric conversion body composed of a first electrode layer 20, a first charge transport layer 30, a photoelectric conversion layer 40, a second charge transport layer 50, and a second electrode layer 60. In the present embodiment, the substrate 10 is a structural member that ensures the strength of the entire solar cell module 1, and is also a protective member that protects the first charge transport layer 30, the photoelectric conversion layer 40, the second charge transport layer 50, and the second electrode layer 60. The substrate 10 may be formed of a resin such as polyimide, polyamide, polyethylene terephthalate, etc., but is typically formed of glass. The substrate 10 has strip-shaped colored regions 11 extending in the second plane direction at both ends in at least the first plane direction of the main surface on the first side in the normal direction (the back side opposite to the light-receiving surface in the present embodiment, the lower side in FIGS. 2 and 3). In the present embodiment, the colored regions 11 are formed in a rectangular shape that is continuous over the entire circumference of the substrate 10.
[0018] The colored regions 11 are regions colored in a color that easily absorbs light. The color of the colored regions 11 is preferably a color that absorbs the laser during manufacturing described later. Note that the "color that absorbs the laser" means a color in which the light absorption rate of the laser wavelength of the colored regions 11 is 95% or more. Also, the color of the colored regions 11 is preferably a color close to that of the photoelectric conversion body so as to improve the designability of the battery module 1, and is typically black. The colored regions 11 define the invalid region of the solar cell module 1. That is, the solar cell module 1 photoelectrically converts the light incident inside the colored regions 11 in a plan view. The colored regions 11 can be formed by applying a paint. As the paint for forming the colored regions 11, for example, a ceramic paint can be used. The lower limit of the width in the first plane direction of each colored region 11 is preferably 10 mm, and more preferably 20 mm. On the other hand, the upper limit of the width in the first plane direction of the colored regions 11 is preferably 100 mm, and more preferably 80 mm. By setting the width in the first plane direction of the colored regions 11 to be equal to or greater than the lower limit, it is possible to reliably cover the region where the photoelectric conversion layer 40 is likely to become non-uniform. Also, by setting the width in the first plane direction of the colored regions 11 to be equal to or less than the upper limit, it is possible to prevent the effective power generation region of the solar cell module 1 from becoming smaller than necessary.
[0019] The first electrode layer 20 is laminated on the main surface of the base material 10 on the side (the first side in the normal direction) where the colored region 11 is formed. The first electrode layer 20 collects the first charges generated in the photoelectric conversion layer 40 through the first charge transport layer 30 and outputs them to the adjacent sub-cell portion 2 or electrode portion 3. In the present embodiment, the first electrode layer 20 is an anode that collects holes. Also, in the present embodiment, the first electrode layer 20 can be formed of a transparent conductive oxide (TCO: Transparent Conductive Oxide) having conductivity and light transmissivity. As the transparent conductive oxide forming the first electrode layer 20, for example, indium oxide, tin oxide, zinc oxide, titanium oxide, and their composite oxides can be used. Among these, indium-based composite oxides mainly composed of indium oxide are preferable. From the viewpoints of high conductivity and transparency, indium oxide is particularly preferable. Furthermore, in order to ensure reliability or higher conductivity, it is preferable to add a dopant to indium oxide. Examples of the dopant include Sn, W, Zn, Ti, Ce, Zr, Mo, Al, Ga, Ge, As, Si, S, etc. As a particularly suitable example, ITO (Indium Tin Oxide) in which tin is added to indium oxide is widely known.
[0020] As the lower limit of the thickness of the first electrode layer 20, 5 nm is preferable, and 10 nm is more preferable. On the other hand, as the upper limit of the thickness of the first electrode layer 20, 200 nm is preferable, and 150 nm is more preferable. By setting the thickness of the first electrode layer 20 to be equal to or greater than the lower limit, the photoelectric conversion efficiency can be improved by reducing the electrical resistance. Also, by setting the thickness of the first electrode layer 20 to be equal to or less than the upper limit, the photoelectric conversion efficiency can be improved by increasing the amount of light incident on the photoelectric conversion layer 40. The first electrode layer 20 may have a multilayer structure such as a laminated structure of a polycrystalline ITO layer and an amorphous ITO layer, for example.
[0021] The first charge transport layer 30 is laminated on the first side in the normal direction of the first electrode layer 20. The first charge transport layer 30 is a layer that allows the charge (photo carrier) of the first polarity generated in the photoelectric conversion layer 40 to pass through, and in this embodiment, it is a hole transport layer (HTL) that transmits holes to the first electrode layer 20. Examples of the main material of the first charge transport layer 30, which is a hole transport layer, include metal oxides such as nickel oxide (NiO) and copper oxide (Cu 2 O), and organic substances such as PTAA (Poly(bis(4-phenyl)(2,4,6-trimethylphenyl)amine)) and Spiro-MeOTAD. Further, the first charge transport layer 30 may be a self-assembled monolayer (SAM: Self-Assembled Monolayers) formed by, for example, 2PACz ([2-(9H-Carbazol-9-yl)ethyl]phosphonic Acid), MeO-2PACz ([2-(3,6-Dimethoxy-9H-carbazol-9-yl)ethyl]phosphonic Acid), Me-4PACz ([4-(3,6-Dimethyl-9H-carbazol-9-yl)butyl]phosphonic Acid), etc. Further, the first charge transport layer 30 may have a multilayer structure. The thickness of the first charge transport layer 30 can vary greatly depending on its material, the configuration of the adjacent layers, etc., but it can be, for example, 0.5 nm or more and 200 nm or less, and particularly in the case of a self-assembled monolayer, it can be the thickness of the material molecules.
[0022] The photoelectric conversion layer 40 is laminated on the first side in the normal direction of the first electrode layer 20 via the first charge transport layer 30. The photoelectric conversion layer 40 contains a perovskite compound that performs photoelectric conversion, absorbs incident light, and generates photo carriers (holes and electrons). The photoelectric conversion layer 40 has inactive regions 41 in which the perovskite compound is continuously amorphized so as to extend in the second plane direction at both ends in the first plane direction that overlap with the colored region 11 in plan view.
[0023] As the perovskite compound contained in the photoelectric conversion layer 40, it contains an organic atom A containing at least one of an alkali metal (Am), a monovalent organic ammonium ion, and an amidinium-based ion, a metal atom B that generates a divalent metal ion, and a halogen atom X containing at least one of iodide ion I, bromide ion Br, chloride ion Cl, and fluoride ion F, and ABX 3 The compound represented by can be used. Examples of the alkali metal include potassium K, cesium Cs, rubidium Rb, etc. Examples of the organic atom A include methylammonium MA (CH 3 NH 3 ), formamidinium FA (CH 3 N 2 ), etc. Examples of the metal atom B include lead Pb and tin Sn, and it is preferably mainly lead. As the halogen atom X, at least one of iodide I, bromide Br, and chloride Cl is preferable.
[0024] Specifically, preferred perovskite compounds include, for example, methylammonium lead halides (MAPbX 3 ), such as MAPbI 3 , MAPbBr 3 , MAPbCl 3 ), and formamidinium lead halides (FAPbX 3 ), such as FAPbI 3 , FAPbBr 3 , FAPbCl 3 ). Note that the halogen atom X may contain multiple types. It may be in a form containing both methylammonium and formamidinium, such as FA y MA 1-y PbX 3 . Also, when an alkali metal is included, examples include Am y FA z MA 1-y-z PbIX, Am y FA 1-y PbIX, etc. Am may be a single type of Cs, Rb, K, or may contain multiple types. (y, z are arbitrary positive integers).
[0025] The inactive region 41 is a region with increased resistance by destroying the crystal structure of the perovskite compound. The inactive region 41 can be confirmed by observation with a scanning electron microscope (SEM). Also, since the inactive region 41 contains metal halides such as PbI 2 etc., it can also be confirmed by measuring the content rate of the metal halide.
[0026] The inactive region 41 electrically separates a region where the film thickness etc. at the outer edge of the photoelectric conversion layer 40 becomes unstable from the effective region of the sub-cell portion 2. The inactive region 41 may be formed in a strip shape extending to the side edge of the photoelectric conversion layer 40, or may be formed in a linear shape that divides the effective region of the sub-cell portion 2 and the ineffective regions at both ends in the first plane direction. By providing the highly resistive inactive region 41, it is possible to suppress a short circuit (leakage current) that may occur due to a decrease in the film thickness of the photoelectric conversion layer 40 at the end portion of the photoelectric conversion layer 40. Since the inactive region 41 can be formed relatively easily as described later, it can be formed at a lower cost than removing the photoelectric conversion layer 40 and other layers at both ends in the first plane direction from the base material 10 by a method such as etching.
[0027] The second charge transport layer 50 is laminated on the first side in the normal direction of the photoelectric conversion layer 40. The second charge transport layer 50 is a layer that allows the charge of the second polarity generated in the photoelectric conversion layer 40 to pass through. In the present embodiment, it is an electron transport layer (ETL) that transfers electrons to the second electrode layer 60. Examples of the main material of the second charge transport layer 50, which is an electron transport layer, include fullerene, PCBM, etc. Examples of fullerene include C60, C70, hydrides, oxides, metal complexes, derivatives with an alkyl group etc. added thereto, for example, PCBM ([6,6]-Phenyl-C61-Butyric Acid Methyl Ester), etc. In particular, by forming the second charge transport layer 50 from a material containing fullerene encapsulating lithium Li, the transport efficiency of electrons can be improved. Also, the second charge transport layer 50 may have a multilayer structure. The thickness of the second charge transport layer 50 can vary greatly depending on its material, the configuration of the adjacent layer, etc., but can be, for example, 3 nm or more and 50 nm or less.
[0028] The second electrode layer 60 is laminated via the second charge transport layer 50 on the first side in the normal direction of the photoelectric conversion layer 40. The second electrode layer 60 is an electrode paired with the first electrode layer 20 and is the negative electrode in this embodiment. The second electrode layer 60 is laminated so as to contact the first electrode layer 20 at the bottom of the second division groove 92 in order to electrically connect the adjacent sub-cell portions 2 in series. The second electrode layer 60 may include a metal layer formed of, for example, copper or the like in order to reduce the electrical resistance. Further, the second electrode layer 60 may have a multilayer structure including a transparent conductive oxide layer or the like for improving the adhesion with the second charge transport layer 50. The second electrode layer 60 can be laminated by a method such as a sputtering method, a vacuum evaporation method, or a plating method.
[0029] As the lower limit of the thickness of the second electrode layer 60, 10 nm is preferable, and 20 nm is more preferable. On the other hand, as the upper limit of the thickness of the second electrode layer 60, 200 nm is preferable, and 100 nm is more preferable. By setting the thickness of the second electrode layer 60 to be equal to or greater than the lower limit, the current collection resistance can be made sufficiently small. Further, by setting the thickness of the second electrode layer 60 to be equal to or less than the upper limit, the formation of the third division groove 93 becomes easy.
[0030] The back surface protective material 70 covers the first side in the normal direction of the photoelectric conversion body and prevents the intrusion of moisture or the like from the back surface side into the solar cell module 1. The back surface protective material 70 can be formed of a sheet-like material and preferably has excellent water shielding properties. Specifically, the back surface protective material 70 can be formed of, for example, a plate material or a film such as polyethylene terephthalate, polyethylene, fluorine-containing resin, silicone resin, or glass, and a laminate of these plate materials or films and a metal foil such as aluminum foil may also be used.
[0031] The sealing material 80 protects the photoelectric conversion body, particularly the photoelectric conversion layer 40, from moisture and the like by sealing the photoelectric conversion body between the base material 10 and the back surface protective material 70. As the sealing material 80, for example, resins having translucency such as ethylene / vinyl acetate copolymer, ethylene / α-olefin copolymer, ethylene / vinyl acetate / triallyl isocyanurate, polyvinyl butyrate, acrylic resin, urethane resin, and silicone resin are preferably used. The sealing material 80 has thermoplasticity that penetrates into the recesses of the photoelectric conversion body such as the third dividing groove 93 during the manufacturing stage, and is preferably formed from a material that can maintain its shape even when the temperature of the solar cell module 1 rises due to the loss of thermoplasticity in the final product. That is, the sealing material 80 is preferably formed of a resin composition mainly composed of a thermoplastic resin and containing a crosslinking agent that activates at a temperature higher than the softening point of the thermoplastic resin and crosslinks and cures the thermoplastic resin.
[0032] The first dividing groove 91, the second dividing groove 92, and the third dividing groove 93 are formed in close proximity in this order, thereby determining the plurality of sub-cell portions 2 and the electrode portions 3 at both ends in a state of being electrically connected in series. The widths of the first dividing groove 91, the second dividing groove 92, and the third dividing groove 93 are preferably 10 μm or more and 200 μm or less, and more preferably 20 μm or more and 100 μm or less. This enables reliable separation between the sub-cell portions 2 and ensures the effective area of the sub-cell portions 2.
[0033] The solar cell module 1 having the above configuration can be manufactured by the solar cell module manufacturing method shown in FIG. 1. The solar cell module manufacturing method of FIG. 1 is itself an embodiment of the solar cell module manufacturing method according to the present invention.
[0034] The method for manufacturing a solar cell module according to this embodiment includes a coloring region forming step (step S01), a first electrode layer laminating step (step S02), a first dividing groove forming step (step S03), a first charge transport layer laminating step (step S04), a photoelectric conversion layer laminating step (step S05), a passivation step (step S06), a second charge transport layer forming step (step S07), a second dividing groove forming step (step S08), a second electrode layer forming step (step S09), a third dividing groove forming step (step S10), and a sealing step (step S11).
[0035] In the coloring region forming step of step S01, a coloring region 11 is formed on the main surface on the first side in the normal direction of the base material 10. The formation of the coloring region 11 can be performed by applying a paint to the base material 10 by a method such as printing.
[0036] In the first electrode layer laminating step of step S02, a first electrode layer 20 is laminated on the first side in the normal direction of the base material 10 on which the coloring region 11 is formed. The first electrode layer 20 can be laminated on the base material 10 by a method such as sputtering or vacuum evaporation.
[0037] In the first dividing groove forming step of step S03, a plurality of first dividing grooves 91 extending in the first planar direction are formed so as to divide the first electrode layer 20 into a plurality of strips. Thereby, the positive electrodes of the respective sub-cell portions 2 are separated from each other. The first dividing groove 91 can be formed by linearly removing the material for forming the first electrode layer 20 by laser ablation.
[0038] In the first charge transport layer laminating step of step S04, a first charge transport layer 30 is laminated on the surface on the first side in the normal direction of the first electrode layer 20 after the first dividing groove 91 is formed and inside the first dividing groove 91. The first charge transport layer 30 can be formed by a method such as coating and drying a solution of an organic material for forming the above-mentioned self-assembled monolayer. When the first charge transport layer 30 is formed of an inorganic material, the first charge transport layer 30 can be formed by a method such as sputtering or vacuum evaporation.
[0039] In the photoelectric conversion layer lamination step of step S05, the photoelectric conversion layer 40 is laminated via the first charge transport layer 30 on the first side in the normal direction of the first electrode layer 20 after the first division groove 91 is formed. When the perovskite compound of the photoelectric conversion layer 40 is methylammonium lead halide (MAPbX 3 (CH 3 NH 3 PbX 3 ), the photoelectric conversion layer 40 can be formed by sequentially forming a lead halide (PbX 2 ) material and a methylammonium halide (MAX) material into films and reacting thin films of these materials at a reaction temperature. For example, when the perovskite compound is methylammonium lead iodide (MAPbI y X (3-y) (CH 3 NH 3 PbI y X (3-y) ), the photoelectric conversion layer 40 is formed, for example, by sequentially forming a lead halide (PbX2) material and a methylammonium iodide (MAI) material into films and reacting thin films of these materials at a reaction temperature. Further, the photoelectric conversion layer 40 can also be formed by a method such as a sol-gel method for synthesizing a perovskite compound in a liquid-phase coating film, or a coating method for applying a solution containing a pre-synthesized perovskite compound.
[0040] In the inactivation step of step S06, the photoelectric conversion layer 40 is locally inactivated by irradiating the colored region 11 with a laser in a linear or strip shape extending in the second plane direction. That is, since the colored region 11 has a high light absorption rate, it is easily heated by the irradiation of the laser, and the photoelectric conversion layer 40 is heated by heat conduction. As a result, the crystals of the perovskite compound in the photoelectric conversion layer 40 directly below the portion of the colored region 11 irradiated with the laser are destroyed, and a highly resistive inactive region 41 is selectively formed. In order to efficiently absorb the laser in the colored region 11, it is preferable that the laser irradiation is performed through the transparent substrate 10. The inactivation step may be performed after the photoelectric conversion layer lamination step, but it is preferable from the viewpoints of accuracy and efficiency to perform it before the second electrode layer formation step of laminating the second electrode layer 60 which may contain a material that easily absorbs and diffuses heat. This step can use a known laser processing apparatus, and for the laser light, for example, the fundamental wave, SHG (second harmonic generation), and THG (third harmonic generation) of a YAG laser or a YVO4 laser can be used. The laser conditions are not particularly limited, but a pulse width of 5 ps to 100 μs, a scanning speed of 10 to 10,000 mm / s, and an output of 0.01 to 10 W are preferably used.
[0041] In the second charge transport layer formation step of step S07, the second charge transport layer 50 is laminated on the first side in the normal direction of the photoelectric conversion layer 40. The second charge transport layer 50 can be formed by a method such as a sol-gel method or a coating method.
[0042] In the second division groove formation step of step S08, a plurality of second division grooves 92 extending in the first plane direction are formed so as to divide the photoelectric conversion layer 40 into a plurality of strips. As a result, the photoelectric conversion layers 40 of the respective sub-cell portions 2 are separated from each other. The second division grooves 92 can be formed by linearly removing the materials for forming the second charge transport layer 50, the photoelectric conversion layer 40, and the first electrode layer 30 by laser ablation.
[0043] In the second electrode layer formation step of step S09, the second electrode layer 60 is laminated via the second charge transport layer 50 on the first side in the normal direction of the photoelectric conversion layer 40 divided by the second division groove 92. The second electrode layer 60 can be laminated by methods such as sputtering, vacuum evaporation, and plating.
[0044] In the third division groove formation step of step S10, a plurality of third division grooves 93 extending in the first planar direction are formed so as to divide the second electrode layer 60 into a plurality of strips. Thereby, the second electrode layers 60 of the respective sub-cell portions 2 are separated from each other.
[0045] In the sealing step of step S11, the photoelectric conversion body is sealed between the base material 10 and the back surface protective material 70 by laminating the sealing material 80 and the back surface protective material 70 on the first side in the normal direction of the second electrode layer 60. This sealing can be performed by hot pressing to melt the sealing material 80.
[0046] As described above, in the method for manufacturing a solar cell module according to the present embodiment, by irradiating a laser on a colored region having a high light absorption rate, the photoelectric conversion layer 40 is locally inactivated in an ineffective region that does not contribute to photoelectric conversion. Therefore, a short circuit of the sub-cell portion 2 caused by non-uniformity at the end of the photoelectric conversion layer 40 can be prevented at a relatively low cost.
[0047] As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and various changes and modifications are possible. For example, in the solar cell module according to the present invention, the first charge transport layer, the second charge transport layer, the back surface protection layer, and the sealing material are not essential components. A solar cell panel may be formed by sealing a plurality of solar cell modules without a back surface protection layer and a sealing material between a pair of protection materials. Further, the solar cell module according to the invention may be configured to convert light incident from the side opposite to the base material into electric power.
Explanation of Reference Numerals
[0048] 1 Solar cell module 10 Base material 11 Colored region 20 First electrode layer 30 First charge transport layer 40 Photoelectric conversion layer 41 Inactive region 50 Second charge transport layer 60 Second electrode layer 70 Back protective material 80 Encapsulant 91 First dividing groove 92 Second dividing groove 93 Third dividing groove
Claims
1. A step of laminating a first electrode layer on the first side in the normal direction of a base material formed in a sheet shape and having strip-shaped colored regions formed at both ends in the first plane direction of the main surface on the first side in the normal direction and extending in a second plane direction intersecting the first plane direction; A step of forming a plurality of first dividing grooves extending in the first plane direction so as to divide the first electrode layer into a plurality of strips; A step of laminating a photoelectric conversion layer containing a perovskite compound on the first side in the normal direction of the first electrode layer in which the first dividing grooves are formed; A step of forming a plurality of second dividing grooves extending in the first plane direction so as to divide the photoelectric conversion layer into a plurality of strips; A step of laminating a second electrode layer on the first side in the normal direction of the photoelectric conversion layer in which the second dividing grooves are formed; A step of forming a plurality of third dividing grooves extending in the first plane direction so as to divide the second electrode layer into a plurality of strips; A step of locally inactivating the photoelectric conversion layer by irradiating the colored region with a laser in a linear or strip shape extending in the second plane direction; A method for manufacturing a solar cell module, comprising the above steps.
2. The method for manufacturing a solar cell module according to claim 1, wherein the step of irradiating the laser is performed after the step of laminating the photoelectric conversion layer and before the step of laminating the second electrode layer.
3. The method for manufacturing a solar cell module according to claim 1 or 2, wherein the laser is irradiated through the base material.
4. A base material formed in a sheet shape; A first electrode layer laminated on the first side in the normal direction of the base material and made of a transparent conductive oxide; A photoelectric conversion layer laminated on the first side in the normal direction of the first electrode layer and containing a perovskite compound; A second electrode layer laminated on the first side in the normal direction of the photoelectric conversion layer; Comprising: A plurality of first dividing grooves extending in a first plane direction so as to divide the first electrode layer into a plurality of strips; A plurality of second dividing grooves extending in the first plane direction so as to divide the photoelectric conversion layer into a plurality of strips; A plurality of third dividing grooves extending in the first plane direction so as to divide the second electrode layer into a plurality of strips; Are formed, The base material has strip-shaped colored regions formed at both ends in the first plane direction of the main surface on the first side in the normal direction and extending in a second plane direction intersecting the first plane direction; The solar cell module, wherein the photoelectric conversion layer has inactive regions that are continuously amorphized and extend in the second plane direction at both ends in the first plane direction overlapping the colored region.
Citation Information
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