WO2010092693A1 - 太陽電池モジュール - Google Patents
太陽電池モジュール Download PDFInfo
- Publication number
- WO2010092693A1 WO2010092693A1 PCT/JP2009/052564 JP2009052564W WO2010092693A1 WO 2010092693 A1 WO2010092693 A1 WO 2010092693A1 JP 2009052564 W JP2009052564 W JP 2009052564W WO 2010092693 A1 WO2010092693 A1 WO 2010092693A1
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- WIPO (PCT)
- Prior art keywords
- reflectance
- low
- solar cell
- module
- sealing member
- Prior art date
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- 238000007789 sealing Methods 0.000 claims abstract description 55
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000000758 substrate Substances 0.000 claims description 52
- 238000002310 reflectometry Methods 0.000 claims description 48
- 239000004065 semiconductor Substances 0.000 claims description 35
- 238000002161 passivation Methods 0.000 claims description 34
- 239000000945 filler Substances 0.000 claims description 33
- 238000009792 diffusion process Methods 0.000 claims description 16
- 239000012535 impurity Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000011521 glass Substances 0.000 description 30
- 239000003795 chemical substances by application Substances 0.000 description 23
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 230000002093 peripheral effect Effects 0.000 description 8
- 230000008832 photodamage Effects 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 5
- 239000005038 ethylene vinyl acetate Substances 0.000 description 5
- 239000000049 pigment Substances 0.000 description 5
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 5
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 5
- 238000005215 recombination Methods 0.000 description 5
- 230000006798 recombination Effects 0.000 description 5
- 239000000565 sealant Substances 0.000 description 5
- 239000000969 carrier Substances 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 229910021419 crystalline silicon Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
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- 238000009413 insulation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 238000001579 optical reflectometry Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000012463 white pigment Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
- H01L31/056—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means the light-reflecting means being of the back surface reflector [BSR] type
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/048—Encapsulation of modules
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
- H01L31/0547—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/06—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices characterised by potential barriers
- H01L31/068—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices characterised by potential barriers the potential barriers being only of the PN homojunction type, e.g. bulk silicon PN homojunction solar cells or thin film polycrystalline silicon PN homojunction solar 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
- Y02E10/52—PV systems with concentrators
-
- 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
- Y02E10/547—Monocrystalline silicon PV cells
Definitions
- the present invention relates to a solar cell module.
- a general crystalline solar cell in which electrodes are formed on the entire back surface of a substrate for a solar cell is a filler sandwiched between a module glass which is a front surface side sealing member and a back sheet which is a back surface side sealing member.
- a plurality of crystalline solar cells (hereinafter referred to as cells) are used as solar cell modules (hereinafter referred to as modules) which are separated by a predetermined distance in the in-plane direction of the module glass.
- a high-reflectance backsheet having a high light reflection characteristic such as white as the backsheet
- the light that has reached the backsheet is efficiently reflected and re-entered into the cell for effective use of light. That is, the reflected light from the high reflectance back sheet exposed in the area between adjacent cells is reflected again by the module glass and enters the cell again, thereby increasing the light generation current and increasing the generated power of the module.
- a high-reflectance backsheet having a high light reflection characteristic such as white as the backsheet
- the use of the high reflectivity backsheet increases the reflected light emitted by the high reflectivity backsheet exposed between the cells and emitted outside through the cells. For this reason, strong light is reflected in a specific direction determined by the installation angle and installation height of the module and the orbit of the sun, and unnecessary light damage is caused to the place where the reflected light is received.
- this light damage can be suppressed by using a low reflectance backsheet having low light reflection characteristics, and for example, a backsheet having a low reflectance such as black or blue other than white can be used. Since the reflected light on the low reflectance backsheet is smaller than when the high reflectance backsheet is used, the amount of reflected light radiated to the outside through the cells is reduced, and light pollution can be suppressed. However, the amount of light that is reflected by the low-reflectance backsheet and module glass and enters the cell again is reduced. For this reason, when a low reflectance backsheet is used, the output of a solar cell module becomes small compared with the case where a high reflectance backsheet is used.
- a solar cell having a structure that suppresses carrier recombination on the back surface of the crystalline solar cell by covering a region other than the formation portion of the back electrode on the back surface of the substrate for the solar cell with a passivation film (hereinafter referred to as back surface passivation type solar cell). Called a battery).
- a film that can suppress the interface state to be low with respect to crystalline silicon such as a silicon oxide film (SiOx), a silicon nitride film (SiN), or a silicon oxynitride film (SiON), is used. Since these films are basically transparent dielectric films, the light reaching the back surface of the solar cell substrate is transmitted to the outside through the passivation film.
- the back surface passivation type solar cell has a plurality of cells in the filler sandwiched between the module glass and the back sheet.
- the module is used as a package separated by a predetermined distance in the inward direction.
- a high-reflectance backsheet with high light reflection characteristics such as white as the backsheet, the light that has reached the backsheet can be efficiently reflected and re-entered into the cell for effective use of light. . That is, the light reflected by the high reflectance back sheet exposed in the area between adjacent cells is reflected again by the module glass and enters the cell again, thereby increasing the light generation current and increasing the generated power of the module. be able to.
- the light that has reached the backside of the solar cell substrate is transmitted to the outside through the passivation film, so that more reflected light from the back sheet is obtained compared to a general crystalline solar cell.
- the current generated in the cell can be increased.
- the recombination of carriers can be suppressed by reducing the interface state between the solar cell substrate and the passivation film, the voltage is also improved.
- the reflected light on the back surface of the module passes between the cells to the outside, as in the case of a module using a general cell in which electrodes are formed on the entire back surface. There is a problem of causing light pollution by being emitted.
- the present invention has been made in view of the above, and an object of the present invention is to obtain a solar cell module capable of realizing high output and light pollution control while corresponding to the thinning of the solar cell substrate.
- a solar cell module includes a filler sandwiched between a front-side sealing member and a rear-side sealing member having translucency.
- a solar cell module in which a plurality of solar cells electrically connected therein are embedded in a space apart in the in-plane direction of the surface side sealing member, and the solar cells are second on one side.
- a first conductivity type semiconductor substrate having an impurity diffusion layer in which a conductivity type impurity element is diffused, an antireflection film formed on the impurity diffusion layer, and penetrating the antireflection film into the impurity diffusion layer.
- the sealing member is a high-reflectance portion having a high reflectance in which at least an area corresponding to the solar battery cell has an average reflectance of 50% or more with respect to light having a wavelength in the range of 400 nm to 1200 nm, and is adjacent to the sealing member.
- any position between the surface of the antireflection film of the solar cell and the back-side sealing member And a low reflectance part having a low reflectance with an average reflectance of less than 50% for light having a wavelength in the range of 400 nm to 1200 nm.
- the present invention there is an effect that it is possible to obtain a solar cell module capable of realizing high output and light pollution control while corresponding to thinning of the solar cell substrate.
- FIG. 1 is a cross-sectional view showing the configuration of the solar cell module according to Embodiment 1 of the present invention.
- FIG. 2 is a cross-sectional view showing the configuration of the solar battery cell according to the first embodiment.
- FIG. 3 is a cross-sectional view showing a configuration of a conventional solar cell module in which the back-side sealing member is composed only of a high reflectance back sheet.
- FIG. 4 is a cross-sectional view showing a configuration of a conventional solar cell module in which the back-side sealing member is composed only of a low reflectance backsheet.
- FIG. 5 is sectional drawing which shows the structure of the solar cell module concerning Embodiment 2 of this invention.
- FIG. 6 is sectional drawing which shows the structure of the solar cell module concerning Embodiment 3 of this invention.
- FIG. 1 is a cross-sectional view showing the configuration of the solar cell module according to Embodiment 1 of the present invention.
- a solar cell module 10 (hereinafter referred to as module 10) according to the present embodiment has a configuration (not shown) in which a plurality of back surface passivation type solar cells 1 (hereinafter referred to as cells 1) are electrically connected.
- FIG. 2 is a cross-sectional view showing a configuration of the cell 1 according to the first embodiment.
- an n-type impurity diffusion layer 3 is formed by phosphorous diffusion on the light receiving surface side of a semiconductor substrate 2 made of P-type polycrystalline silicon, and an antireflection film made of a silicon nitride film. 4 is formed.
- the semiconductor substrate 2 which is a substrate for solar cells, a P-type single crystal or polycrystalline silicon substrate can be used.
- the semiconductor substrate 2 is not limited to this, and an n-type silicon substrate may be used.
- fine irregularities are formed as a texture structure on the surface of the cell 1 on the light receiving surface side of the semiconductor substrate 2. The micro unevenness increases the area for absorbing light from the outside on the light receiving surface, suppresses the reflectance on the light receiving surface, and has a structure for confining light.
- a surface electrode 5 electrically connected to the impurity diffusion layer 3 is provided on the light receiving surface side of the semiconductor substrate 2.
- a grid electrode and a bus electrode are provided, and a plurality of elongated grid electrodes are provided side by side on the light receiving surface side of the semiconductor substrate 2, and the bus electrode electrically connected to the grid electrode is substantially the same as the grid electrode. They are provided so as to be orthogonal to each other, and are respectively electrically connected to the impurity diffusion layer 3 at the bottom portion.
- the grid electrode and the bus electrode are made of a silver material.
- a back surface electrode 6 made of an aluminum material is partially provided on the back surface (surface opposite to the light receiving surface) of the semiconductor substrate 2 in the same manner as the front surface electrode 5 (bus electrode). And the area
- the module 10 is sandwiched between a front surface side sealing member 21 disposed on the front surface side of the module 10 and a high reflectivity back sheet 23 which is a back surface side sealing member disposed on the back surface side of the module 10.
- a plurality of cells 1 are packaged in a filler (sealing agent) 22 separated by a predetermined distance in the in-plane direction of the module glass 21. Adjacent cells 1 are electrically connected.
- the front-side sealing member 21 is made of a light-transmitting material, and for example, module glass is used (hereinafter referred to as module glass 21).
- the filler (sealant) 22 includes a surface-side filler (sealant) 22a that seals the surface side of the cell 1, and a back-side filler (sealant) 22b that seals the back side of the cell 1. And consist of For example, EVA (ethylene vinyl acetate) resin is used for the front side filler (sealant) 22a and the back side filler (sealant) 22b, and the cell 1 is sandwiched between these two EVA resins.
- EVA ethylene vinyl acetate
- the high reflectivity backsheet 23 is a high reflectivity portion that exhibits a metallic color such as silver or white, and has high light reflectivity. Further, a low reflectance portion having a low reflectance of light is formed on the surface of the high reflectance backsheet 23 on the module glass 21 side, in a region corresponding to between adjacent cells 1 and an outer peripheral portion of the module 10.
- a low reflectivity backsheet 24 is provided.
- the high reflectance means that the average reflectance for light having a wavelength in the range of 400 nm to 1200 nm is 50% or more. Further, the low reflectance means that the average reflectance for light having a wavelength in the range of 400 nm to 1200 nm is less than 50%.
- the dark color means a color having a low reflectance of light.
- the high reflectivity back sheet 23 is a high reflectivity back sheet having both high reflectivity and insulation, which is formed by adding a white pigment to an insulating resin or the like. Further, by covering the metal foil with an insulating resin or the like, a high reflectivity back sheet having both high reflectivity and insulating properties can be configured.
- the low reflectivity backsheet 24 is on the module glass 21 side of the high reflectivity backsheet 23, and the area corresponding to the adjacent cells 1 and the area of the outer peripheral portion of the module 10 are dark. It is the coating part formed by being painted.
- the low reflectance backsheet 24 may be formed by adding a dark pigment partially to a predetermined position of the high reflectance backsheet 23.
- a low reflectance material portion for example, a low reflectance backsheet may be laminated at a predetermined position on the high reflectance backsheet 23.
- the module 10 packaged with two cells 1 is shown, but the number of cells 1 is not limited to this and may be configured with a large number of cells 1. it can.
- the incident light 31 which is sunlight and directly irradiated to the cell 1 is reflected by the high reflectivity back sheet 23 after passing through the cell 1 and becomes reflected light 32, and again.
- the light enters the cell 1. Further, a part of the incident light 31 is reflected by the surface of the antireflection film 4 to become reflected light 33, further reflected by the module glass 21 and incident again on the cell 1 (not shown), and the module glass as it is. And light (not shown) going out through 21. A part of the incident light 31 is reflected by the surface of the passivation film 7 to become reflected light 34, and is incident on the cell 1 again.
- the light reflected by the low reflectance back sheet 24 and further reflected by the module glass 21 and entering the cell 1 again is reduced.
- the light reaching the back surface of the semiconductor substrate 2 is transmitted to the outside through the passivation film 7.
- the generated current can be greatly increased by the reflected light 32 on the high reflectivity backsheet 23 immediately below the back surface of the cell 1 occupying most of the area of the module 10.
- the voltage is also improved. Therefore, high output can be obtained in the module 10.
- the back electrode 6 is partially formed without being formed on the entire surface of the semiconductor substrate 2, so that warpage due to a difference in thermal expansion coefficient between the semiconductor substrate 2 and the back electrode 6 is generated. Can be suppressed.
- FIG. 3 shows a conventional module in which the back-side sealing member is composed of only the high-reflectance backsheet 23, is the surface on the module glass 21 side, and corresponds to the area between the adjacent cells 1 and the module 10
- FIG. 3 shows the structure of the module in which the low reflectance back sheet
- the incident light 35 that is sunlight and directly irradiated between the adjacent cells 1 is reflected by the high-reflectance backsheet 23 to become reflected light 36a.
- the reflected light 36a is reflected light from the high reflectance back sheet 23 since the reflected light 36a is reflected light from the high reflectance back sheet 23, most of the reflected light 36a is not absorbed and more reflected light 37 is radiated to the outside through the cells 1, and unnecessary light to the outside. Cause harm. A part of the reflected light 36 a is reflected by the surface of the module glass 21 to become reflected light 38 and enters the cell 1 again.
- FIG. 4 shows a conventional module in which the back-side sealing member is composed of only the low-reflectance backsheet 24 and the high-reflectance backsheet 23 is not provided in the area corresponding to the backside of the cell 1.
- FIG. 4 In this case, most of the incident light 35, which is sunlight and directly irradiated between the adjacent cells 1, is absorbed by the low reflectance backsheet 24, and the reflected light 36 becomes slight. Thereby, the reflected light 36b radiated
- the incident light 31 that is sunlight and directly irradiates the cell 1 is reflected by the low reflectance backsheet 24 after passing through the cell 1 and becomes reflected light 32a. Is absorbed and the amount of reflected light 36 becomes small, which causes a decrease in output and prevents an increase in output.
- an n-type impurity diffusion layer 3 is formed by phosphorous diffusion on the light-receiving surface side of a p-type polycrystalline silicon substrate that is the semiconductor substrate 2.
- the n-type impurity diffusion layer 3 formed on the end surface and the back surface is removed by, for example, etching.
- an antireflection film 4 is formed on the impurity diffusion layer 3.
- the surface electrode 5 is formed so as to be electrically connected to the n-type impurity diffusion layer 3.
- Various methods can be used as a method for obtaining conduction.
- the surface electrode 5 can be formed by fire-through generally used in the mass production process of solar cells.
- a passivation film 7 is formed on the back surface portion of the semiconductor substrate 2 where the p-type polycrystalline silicon is exposed.
- the back electrode 6 is formed so as to be electrically connected to the p-type polycrystalline silicon.
- Various methods can be used for the conduction, but for example, it can be formed by fire-through generally used when the surface electrode 5 is formed in a mass production process of a solar cell.
- the back surface electrode 6 can be formed by printing after removing the passivation film 7 of the portion where the back surface electrode 6 is to be formed by laser.
- the front surface electrode 5 and the back surface electrode 6 are formed as separate steps. However, forming the front and back surface electrodes simultaneously by, for example, fire-through makes the process more mass-productive.
- a method for manufacturing the module 10 will be described.
- a front surface side filler (sealing agent) 22a On the module glass 21, a front surface side filler (sealing agent) 22a, a plurality of cells 1 interconnected to extract power to the outside, a back surface side filler (sealing agent) 22b, a high reflectance back
- the sheets 23 are stacked in this order, they are heated and pressed in a vacuum, for example.
- the module glass 21 to the high reflectance back sheet 23 are integrated by the front surface side filler (sealing agent) 22a and the back surface side filler (sealing agent) 22b, and the module 10 is completed.
- the low reflectance backsheet 24 which is a low reflectance part is previously formed in the area
- the low-reflectance backsheet 24 is on the module glass 21 side of the high-reflectivity backsheet 23, and the area corresponding to the space between the adjacent cells 1 and the area of the outer periphery of the module 10 are painted in a dark color and dried. To form.
- the light transmitted through the cell 1 is reflected by the high-reflectance backsheet 23 and incident again on the cell 1, thereby increasing the generated current of the cell 1.
- the output can be increased, and at the same time, the light incident between the adjacent cells 1 is reflected by the low-reflectance backsheet 24, thereby suppressing the occurrence of unnecessary light reflection outside the module 10. it can.
- the back electrode 6 is partially formed without being formed on the entire surface of the semiconductor substrate 2, so that no warpage due to the difference in thermal expansion coefficient between the semiconductor substrate 2 and the back electrode 6 occurs. . Therefore, according to the module 10 concerning this Embodiment, the solar cell module which implement
- FIG. FIG. 5 is a cross-sectional view showing the configuration of the module 40 according to the second embodiment of the present invention. Similar to the module 10, the module 40 according to the present embodiment has a configuration (not shown) in which a plurality of cells 1 are directly electrically connected. In FIG. 5, the same members as those in FIG.
- the module 40 according to the second embodiment is different from the module 10 according to the first embodiment in that the low reflectivity portion 41 having a low reflectivity is the surface in the area between the adjacent cells 1 and the outer peripheral area of the module 10. It is that it is arrange
- the low-reflectance sheet 41 for example, a sheet darkened by mixing a dark pigment into a filler (sealing agent) 22 made of transparent EVA resin can be used.
- the low reflectance part 41 is not limited to this, If it has a low reflectance and can arrange
- the incident light 31 which is sunlight and directly irradiated to the cell 1 is reflected by the high reflectivity backsheet 23 after passing through the cell 1 to become reflected light 32, and again.
- the light enters the cell 1. Further, a part of the incident light 31 is reflected by the surface of the antireflection film 4 to become reflected light 33, further reflected by the module glass 21 and incident again on the cell 1 (not shown), and the module glass as it is. And light (not shown) going out through 21. A part of the incident light 31 is reflected by the surface of the passivation film 7 to become reflected light 34, and is incident on the cell 1 again.
- the light reflected by the low reflectivity portion 41 and further reflected by the module glass 21 and entering the cell 1 again is reduced.
- the light reaching the back surface of the semiconductor substrate 2 is transmitted to the outside through the passivation film 7.
- the generated current can be significantly increased by the reflected light 32 on the high reflectivity backsheet 23 immediately below the back surface of the cell 1 occupying most of the area of the module 40.
- the voltage is also improved. Therefore, high output can be obtained in the module 40.
- the back electrode 6 is partially formed without being formed on the entire surface of the semiconductor substrate 2, so that warpage due to a difference in thermal expansion coefficient between the semiconductor substrate 2 and the back electrode 6 is generated. Can be suppressed.
- a method for manufacturing the module 40 will be described.
- the steps after the manufacturing of the cell 1 will be described.
- a surface side filler (sealing agent) 22a and a plurality of cells 1 interconnected to take out electric power are stacked in this order.
- a dark pigment is disposed in a region between the adjacent cells 1, and further, the back surface side filler (sealing agent) 22b and the high reflectance back sheet 23 are arranged. After stacking in this order, these are heated and pressed in a vacuum, for example.
- the module glass 21 to the high reflectance back sheet 23 are integrated by the front surface side filler (sealing agent) 22a and the back surface side filler (sealing agent) 22b, and the module 10 is completed. Further, a low reflectance portion 41 is formed by a dark pigment between the front surface side filler (sealing agent) 22a and the back surface side filler (sealing agent) 22b in the region between the adjacent cells 1. .
- the light transmitted through the cell 1 is reflected by the high-reflectance backsheet 23 and is incident again on the cell 1, thereby increasing the generated current of the cell 1.
- the output can be increased at the same time, and at the same time, the light incident between the adjacent cells 1 is reflected by the low reflectivity portion 41, thereby suppressing the occurrence of unnecessary light reflection to the outside of the module 10.
- the back electrode 6 is partially formed without being formed on the entire surface of the semiconductor substrate 2, so that warpage due to a difference in thermal expansion coefficient between the semiconductor substrate 2 and the back electrode 6 is generated. Can be suppressed. Therefore, according to the module 40 concerning this Embodiment, the solar cell module which implement
- FIG. 6 is a cross-sectional view showing a configuration of a module 50 according to the third embodiment of the present invention. Similar to the module 10, the module 50 according to the present embodiment has a configuration (not shown) in which a plurality of cells 1 are electrically connected directly. In FIG. 6, the same members as those in FIG.
- the module 50 according to the third embodiment is different from the module 10 according to the first embodiment in that the low reflectance sheet 51 which is a low reflectance portion having a low reflectance corresponds to a region between adjacent cells 1. That is, it is arranged across the area. Also, in the outer peripheral region of the module 10, the back surface of the passivation film 7 and the front surface of the low reflectivity sheet 51 are disposed in the same position in the thickness direction of the module 10.
- the low reflectivity sheet 51 for example, a sheet made of the same material as the high reflectivity back sheet 23 and painted in a dark color can be used. In addition, it is also possible to use a material that is darkened by mixing a dark pigment into a sheet of the same material as the filler (sealing agent) 22. Further, the arrangement position of the low reflectance sheet 51 is not limited to this, and the area corresponding to the area between the adjacent cells 1 and the outer peripheral area of the module 10, which is the passivation film 7 and the high reflectance backsheet. What is necessary is just to arrange
- the incident light 31 which is sunlight and directly irradiated to the cell 1 is reflected by the high reflectivity backsheet 23 after passing through the cell 1 to become reflected light 32, and again.
- the light enters the cell 1. Further, a part of the incident light 31 is reflected by the surface of the antireflection film 4 to become reflected light 33, further reflected by the module glass 21 and incident again on the cell 1 (not shown), and the module glass as it is. And light (not shown) going out through 21. A part of the incident light 31 is reflected by the surface of the passivation film 7 to become reflected light 34, and is incident on the cell 1 again.
- the light reflected by the low reflectivity sheet 51 and further reflected by the module glass 21 and entering the cell 1 again is reduced.
- the light reaching the back surface of the semiconductor substrate 2 is transmitted to the outside through the passivation film 7.
- the generated current can be significantly increased by the reflected light 32 on the high reflectivity backsheet 23 immediately below the back surface of the cell 1 occupying most of the area of the module 50.
- the voltage is also improved. Therefore, high output can be obtained in the module 50.
- the back electrode 6 is partially formed without being formed on the entire surface of the semiconductor substrate 2, thereby causing warpage due to the difference in thermal expansion coefficient between the semiconductor substrate 2 and the back electrode 6. Can be suppressed.
- a method for manufacturing the module 50 will be described.
- the steps after the manufacturing of the cell 1 will be described.
- a surface side filler (sealing agent) 22a and a plurality of cells 1 interconnected to take out electric power are stacked in this order.
- the low reflectance sheet 51 is disposed across the adjacent cells 1 (passivation film 7).
- the low reflectance sheet 51 is also disposed in the area that becomes the outer peripheral area of the module 10 so as to be placed on the cell 1 (passivation film 7).
- the back surface side filler (sealing agent) 22b and the high reflectance back sheet 23 are stacked in this order, these are heated and pressed in a vacuum, for example.
- the module glass 21 to the high reflectance back sheet 23 are integrated by the front surface side filler (sealing agent) 22a and the back surface side filler (sealing agent) 22b, and the module 10 is completed.
- the light transmitted through the cell 1 is reflected by the high-reflectance back sheet 23 and is incident on the cell 1 again to increase the generated current of the cell 1.
- the output can be increased at the same time, and at the same time, the light incident between the adjacent cells 1 is reflected by the low reflectivity sheet 51, thereby suppressing the occurrence of unnecessary light reflection to the outside of the module 50.
- the back electrode 6 is partially formed without being formed on the entire surface of the semiconductor substrate 2, so that warpage due to the difference in thermal expansion coefficient between the semiconductor substrate 2 and the back electrode 6 can be generated. Can be suppressed. Therefore, according to the module 50 concerning this Embodiment, the solar cell module which implement
- the solar cell module according to the present invention is useful for thinning the solar cell substrate.
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Abstract
Description
2 半導体基板
3 不純物拡散層
4 反射防止膜
5 表面電極
6 裏面電極
7 パッシベーション膜
10 太陽電池モジュール(モジュール)
21 表面側封止部材(モジュールガラス)
22 充填材(封止剤)
22a 表面側充填材(封止剤)
22b 裏面側充填材(封止剤)
23 高反射率バックシート
24 低反射率バックシート
31 入射光
32 反射光
32a 反射光
33 反射光
34 反射光
35 入射光
36 反射光
36a 反射光
36b 反射光
37 反射光
38 反射光
40 太陽電池モジュール(モジュール)
41 低反射率シート
41 低反射率部
50 太陽電池モジュール(モジュール)
51 低反射率シート
図1は、本発明の実施の形態1にかかる太陽電池モジュールの構成を示す断面図である。本実施の形態にかかる太陽電池モジュール10(以下、モジュール10と呼ぶ)は、複数の裏面パッシベーション型太陽電池セル1(以下、セル1と呼ぶ)が電気的に接続された構成(図示せず)を有する。図2は、本実施の形態1にかかるセル1の構成を示す断面図である。
図5は、本発明の実施の形態2にかかるモジュール40の構成を示す断面図である。本実施の形態にかかるモジュール40は、モジュール10と同様に、複数のセル1が電気的に直接接続された構成(図示せず)を有する。なお、図5においては、図1と同じ部材については同じ符号を付すことで詳細な説明は省略する。
図6は、本発明の実施の形態3にかかるモジュール50の構成を示す断面図である。本実施の形態にかかるモジュール50は、モジュール10と同様に、複数のセル1が電気的に直接接続された構成(図示せず)を有する。なお、図6においては、図1と同じ部材については同じ符号を付すことで詳細な説明は省略する。
Claims (9)
- 透光性を有する表面側封止部材と裏面側封止部材との間に狭持された充填材の中に電気的に接続された複数の太陽電池セルが前記表面側封止部材の面内方向において離間して埋設されてなる太陽電池モジュールであって、
前記太陽電池セルは、
一面側に第2導電型の不純物元素が拡散された不純物拡散層を有する第1導電型の半導体基板と、
前記不純物拡散層上に形成された反射防止膜と、
前記反射防止膜を貫通して前記不純物拡散層に電気的に接続する第1電極と、
前記半導体基板の他面側に形成されたパッシベーション膜と、
前記パッシベーション膜に埋設されて前記半導体基板の他面側に電気的に接続する第2電極と、
を備えてなり、
前記裏面側封止部材は、
少なくとも前記太陽電池セルに対応する領域が、400nm~1200nmの範囲の波長の光に対する平均の反射率が50%以上である高反射率を有する高反射率部とされ、
隣接する前記太陽電池セル間の領域または前記太陽電池モジュールの厚み方向においてこの領域に対応した領域には、前記太陽電池セルの反射防止膜の表面と前記裏面側封止部材との間のいずれかの位置に、400nm~1200nmの範囲の波長の光に対する平均の反射率が50%未満である低反射率を有する低反射率部を備えること、
を特徴とする太陽電池モジュール。 - 前記裏面側封止部材が、前記高反射率を有する高反射率シートであり、
前記低反射率部は、前記高反射率シートの前記太陽電池セル側であって前記太陽電池セル間の領域に対応した領域に前記低反射率を有する色の塗装がなされた塗装部であること、
を特徴とする請求項1に記載の太陽電池モジュール。 - 前記裏面側封止部材が、前記高反射率を有する高反射率シートであり、
前記低反射率部は、前記高反射率シートの前記太陽電池セル側であって前記太陽電池セル間の領域に対応した領域に前記低反射率を有する低反射率材料部が配置されてなること、
を特徴とする請求項1に記載の太陽電池モジュール。 - 前記裏面側封止部材は、前記高反射率を有する高反射率シートであり、
前記低反射率部は、前記高反射率シートの前記太陽電池セル間の領域に対応した領域に前記低反射率を有する低反射率材料が部分的に混入されてなること、
を特徴とする請求項1に記載の太陽電池モジュール。 - 前記裏面側封止部材は、前記高反射率を有する高反射率シートであり、
前記低反射率部は、前記太陽電池セル間の領域に前記低反射率を有する低反射率材料部が配置されてなること、
を特徴とする請求項1に記載の太陽電池モジュール。 - 前記低反射率材料部は、前記低反射率を有する低反射率材料が前記充填材に部分的に混入されてなること、
を特徴とする請求項5に記載の太陽電池モジュール。 - 前記裏面側封止部材は、前記高反射率を有する高反射率シートからなり、
前記低反射率部は、前記太陽電池セル間の領域に対応する領域であって前記パッシベーション膜と前記裏面側封止部材との間のいずれかの位置に、前記低反射率を有する低反射率材料部が配置されてなること、
を特徴とする請求項1に記載の太陽電池モジュール。 - 前記低反射率材料部は、前記高反射率シートと同一材料のシートに前記低反射率を有する色の塗装がなされた塗装部であること、
を特徴とする請求項7に記載の太陽電池モジュール。 - 前記低反射率材料部は、前記高反射率シートと同一材料のシートに前記低反射率を有する低反射率材料が混入されてなること、
を特徴とする請求項7に記載の太陽電池モジュール。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09840013.8A EP2398063A4 (en) | 2009-02-16 | 2009-02-16 | SOLAR BATTERY MODULE |
US13/145,365 US20110297207A1 (en) | 2009-02-16 | 2009-02-16 | Solar battery module |
CN2009801567454A CN102318079A (zh) | 2009-02-16 | 2009-02-16 | 太阳能电池模块 |
JP2010550393A JPWO2010092693A1 (ja) | 2009-02-16 | 2009-02-16 | 太陽電池モジュール |
PCT/JP2009/052564 WO2010092693A1 (ja) | 2009-02-16 | 2009-02-16 | 太陽電池モジュール |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2009/052564 WO2010092693A1 (ja) | 2009-02-16 | 2009-02-16 | 太陽電池モジュール |
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WO2010092693A1 true WO2010092693A1 (ja) | 2010-08-19 |
Family
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Country Status (5)
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US (1) | US20110297207A1 (ja) |
EP (1) | EP2398063A4 (ja) |
JP (1) | JPWO2010092693A1 (ja) |
CN (1) | CN102318079A (ja) |
WO (1) | WO2010092693A1 (ja) |
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JPWO2017154384A1 (ja) * | 2016-03-10 | 2019-01-10 | 株式会社カネカ | 太陽電池モジュール |
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JP2018010955A (ja) * | 2016-07-13 | 2018-01-18 | 大日本印刷株式会社 | 太陽電池モジュール用の裏面保護シート及びそれを用いてなる太陽電池モジュール |
JP2021101490A (ja) * | 2016-07-13 | 2021-07-08 | 大日本印刷株式会社 | 太陽電池モジュール用の裏面保護シート及びそれを用いてなる太陽電池モジュール |
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EP2398063A1 (en) | 2011-12-21 |
CN102318079A (zh) | 2012-01-11 |
US20110297207A1 (en) | 2011-12-08 |
EP2398063A4 (en) | 2015-02-11 |
JPWO2010092693A1 (ja) | 2012-08-16 |
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