JP2007173723A - Solar battery module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emission type solar battery module where light emitting elements are arranged, the solar battery module giving such an impression that the entire photodetection surface illuminates. <P>SOLUTION: The solar battery module 1A is equipped with a thin-film solar battery assembly 10 including a light transmissive insulating substrate 11, a light transmissive conductive layer 12, a photoelectric conversion layer 13, and a back surface electrode layer 14, and a light emitting element assembly 20 including a light emitting device 22 and a circuit board 21 mounted with the light emitting device 22. The light emitting device assembly 20 is arranged having its light emission surface opposed to a main surface of the thin-film solar battery assembly 10 on the opposite side from a photodetection surface, and the thin-film solar battery assembly 10 is provided with a window part 18 for light projection being opposed to the part where the light emitting device 22 is arranged. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a solar cell module, and more particularly, to a light-emitting solar cell module that has illumination properties, display properties, decorative properties, and the like by providing light emitting elements such as LEDs (Light Emitting Diodes).

  2. Description of the Related Art Conventionally, various composite devices have been proposed in which a lighting device that can be used for compact lighting, guide signs, illumination, and the like, and a solar cell that can generate power by receiving sunlight. If such a composite device is used, the device can be used as a solar cell during the daytime, and the device can be used as a lighting device, a display device, or an advertising medium at night.

For example, in the illumination panel disclosed in Japanese Patent Application Laid-Open No. 60-78477 (Patent Document 1), the solar cell is disposed in the vicinity of the light emitting surface of the panel-like light emitter so that the light emitting surface and the light receiving surface are the same surface. A light receiving surface is arranged. Moreover, in the light emitting module using photovoltaic power generation disclosed in Japanese Patent Application Laid-Open No. 2001-351418 (Patent Document 2), the power generation unit and the light emitting unit that emits light by the electromotive force of the power generation unit are formed on a single flat substrate. Implemented. Moreover, in the solar power generation device disclosed in Japanese Patent Laid-Open No. 2005-79169 (Patent Document 3), the light emitting elements are arranged between the crystalline silicon cells of the solar battery, and the positions corresponding to the arrangement positions of the light emitting elements are provided. A light-shielding sheet or light-shielding plate formed with a hole through which light emitted from the light-emitting element is transmitted is disposed.
JP-A-60-78477 JP 2001-351418 A Japanese Patent Laid-Open No. 2005-79169

  However, in the composite devices disclosed in Patent Documents 1 to 3, all of them are based on the premise that crystalline silicon is used as a solar cell. Therefore, light emitting elements are sparsely arranged on the light receiving surface. Therefore, the lighting properties, display properties, and decorative properties are all insufficient. As a result, there has been a problem that functions such as illumination, display, and decoration when used as compact lighting, information signs, illumination, etc., are very low.

  Specifically, in the illumination panel disclosed in Patent Document 1, since the light receiving surface of the solar cell is disposed in the vicinity of the light emitting surface of the panel-like light emitter, only the peripheral portion of the light receiving surface emits light. As a result, the lighting performance, display performance, decorativeness, etc. are inferior.

  Further, in the light emitting module using photovoltaic power generation disclosed in Patent Document 2, the power generation unit and the light emitting unit that emits light by the electromotive force of the power generation unit are mounted on a single flat substrate. The portion is mounted on the front surface of the substrate, and the light emitting portion is mounted on the back surface of the substrate. And in order to irradiate the light radiate | emitted from a light emission part to the front side of a light emitting module, it is set as the structure which provides a through hole in the position where the light emission part of the board | substrate was mounted. For this reason, the mounting position of the light emitting unit is restricted to the peripheral part of the light receiving surface, and only the peripheral part of the light receiving surface emits light like the illumination panel disclosed in Patent Document 1 above, so that the illuminability and display properties are increased. It will be inferior to decorativeness etc.

  Further, in the solar power generation device disclosed in Patent Document 3, since the spread of light emitted from the light emitting element is forcibly limited by the light shielding sheet or the light shielding plate, the entire light receiving surface emits light. There is a problem that an impression like that is not obtained, and only a dot-like expression is obtained. Therefore, it is inferior in illumination property, display property, decorativeness, and the like.

  Therefore, the present invention has been made to solve the above-described problems, and in a light-emitting solar cell module provided with a light-emitting element, an impression can be obtained as if the entire light-receiving surface is emitting light. It is intended to do.

  A solar cell module according to the present invention includes a thin-film solar cell assembly including a translucent insulating substrate, a translucent conductive layer, a photoelectric conversion layer, and a back electrode layer, a light emitting element, and a circuit board on which the light emitting element is mounted. A light emitting device assembly. The light emitting element assembly is disposed such that the light emitting surface thereof faces the main surface opposite to the light receiving surface of the thin film solar cell assembly. The thin-film solar cell assembly includes a light projecting window that transmits light emitted from the light emitting device by cutting out the photoelectric conversion layer and the back electrode layer at a portion facing the portion where the light emitting device is disposed. Is provided.

  By comprising in this way, the light radiate | emitted from the light emitting element will be guide | induced to the exterior of a solar cell module through the light projection window part provided in the thin film solar cell assembly. Therefore, by arranging the light emitting elements densely, it is possible to give an impression as if the entire light receiving surface of the solar cell module is emitting light. Therefore, a light emitting solar cell module having excellent illumination properties, display properties, decorativeness, and the like can be obtained. Also in that case, the lighting efficiency and the power generation efficiency can be appropriately set in consideration of the use conditions by adjusting the density at which the light emitting elements are arranged. It is possible to suppress it.

  In the solar cell module according to the present invention, of the light emitted from the light emitting element, at least the size of the light emitted within the angle range defined by the directivity angle of the light emitting element, It is preferable that the light projection window is formed.

  With this configuration, light emitted from the light emitting element can be more efficiently guided to the outside of the solar cell module, and illumination efficiency can be maintained high.

  In the solar cell module according to the present invention, it is preferable that a plurality of the light emitting elements are arranged in an array on the circuit board. In this case, the light projecting window portion is the plurality of light emitting elements. It is preferable that it is provided individually corresponding to each of the above.

  With this configuration, it is possible to minimize the output drop of the solar cell module.

  In the solar cell module according to the present invention, it is preferable that a plurality of the light emitting elements are arranged in an array on the circuit board, and in that case, the light projecting window portions are arranged in an array. Preferably, the light emitting elements are provided in a stripe shape corresponding to each row or each column.

  By configuring in this way, it becomes possible to easily form the light projection window at the time of manufacturing the solar cell module, and it is possible to obtain a light emitting solar cell module that can be manufactured at low cost.

  In the solar cell module according to the present invention, a part of the photoelectric conversion layer and a part of the back electrode layer in a portion corresponding to a portion where the light emitting element is not disposed is cut out in the thin film solar cell assembly. It is preferable that a daylighting window portion through which a part of the light irradiated on the light receiving surface is transmitted is provided.

  With this configuration, part of the sunlight irradiated to the solar cell module is transmitted to the back side of the solar cell module through the daylighting window. It becomes possible to have the function of.

  In the solar cell module according to the present invention, the thin-film solar cell assembly and the light-emitting element assembly are preferably bonded with a translucent adhesive, and in particular, the translucent adhesive is used. The adhesive preferably contains an ethylene vinyl acetate copolymer (EVA) resin as a main component.

  With this configuration, the thin-film solar cell assembly and the light-emitting element assembly can be joined while the light emitted from the light-emitting element is efficiently led out to the outside. Further, by using an adhesive containing EVA resin as a main component, a highly reliable integrated module can be obtained.

  In the solar cell module according to the present invention, the thin-film solar cell assembly and the light-emitting element assembly are joined by joining the thin-film solar cell assembly and the light-emitting element assembly through spacers at their ends. It is preferable that an air layer is provided between the two.

  By configuring in this way, it becomes possible to form a heat insulating layer by an air layer, and therefore, when the solar cell module according to the present invention is used as a composite glass type solar cell module, condensation can be prevented. become.

  In the solar cell module according to the present invention, the circuit board is preferably a light-transmitting substrate, and in particular, the circuit board is preferably a glass substrate or a polyethylene terephthalate (PET) substrate. is there.

  With this configuration, light can be transmitted through the circuit board. Therefore, when the solar cell module according to the present invention is used as a daylighting type solar cell module, it is possible to increase the amount of light collected. Become.

  In the solar cell module according to the present invention, the light-emitting element assembly includes a plurality of the circuit boards on which the light-emitting elements are mounted, and the back-side support substrate that supports the plurality of circuit boards is provided with the plurality of the circuit boards. It is preferable to have it on the opposite side to the said light emission surface side of a circuit board.

  With this configuration, a large-area solar cell module can be easily manufactured.

  In the solar cell module according to the present invention, it is preferable that the back side support substrate is made of a translucent plate-like member.

  By configuring in this way, light can be transmitted through the back side support substrate. Therefore, when the solar cell module according to the present invention is used particularly as a daylighting type solar cell module, the amount of light collected can be increased. It becomes possible.

  In the solar cell module according to the present invention, the thin-film solar cell assembly includes a plurality of the light-transmitting insulating substrates, and the front-side support substrate that supports the plurality of light-transmitting insulating substrates is the light-receiving surface. It is preferable to have on the side.

  With this configuration, a large-area solar cell module can be easily manufactured.

  In the solar cell module based on the said invention, it is preferable that the said front side support substrate consists of an optical plate-shaped member.

  By configuring in this way, light can be transmitted through the back side support substrate. Therefore, when the solar cell module according to the present invention is used particularly as a daylighting type solar cell module, the amount of light collected can be increased. It becomes possible.

  In the solar cell module according to the present invention, it is preferable that the thin-film solar cell assembly and the light-emitting element assembly are fixed via a frame.

  With this configuration, the thin-film solar cell assembly and the light-emitting element assembly can be manufactured separately, so that material loss can be minimized, and the thin-film solar cell assembly and the light-emitting element can be reduced. When one of the element assemblies is damaged, only the damaged assembly can be replaced.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as the light emission type solar cell module from which the impression as if the whole light-receiving surface is light-emission is acquired.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(Embodiment 1)
FIG. 1 is a schematic diagram when the solar cell module according to Embodiment 1 of the present invention is viewed from the front side. 2 is a schematic cross-sectional view taken along line II-II shown in FIG. 1, and FIG. 3 is a schematic cross-sectional view taken along line III-III shown in FIG.

  As shown in FIGS. 1 to 3, the solar cell module 1 </ b> A in the present embodiment has a plate-like outer shape that is substantially rectangular in plan view, has a thin-film solar cell assembly 10 on the front surface side, and a back surface. A light emitting device assembly 20 is provided on the side. As shown in FIG. 2 and FIG. 3, the respective assemblies are integrated by being bonded with a light-transmitting adhesive, and therefore, between the thin-film solar cell assembly 10 and the light-emitting element assembly 20. The adhesive layer 31 is formed.

  As shown in FIGS. 2 and 3, the thin-film solar cell assembly 10 includes a light-transmitting insulating substrate 11 located on the front surface side, and a light-transmitting conductive layer 12 provided on the back surface side of the light-transmitting insulating substrate 11. The photoelectric conversion layer 13 provided in the back side of the translucent conductive layer 12 and the back surface electrode layer 14 provided in the back side of the photoelectric conversion layer 13 are included. The translucent insulating substrate 11 has a substantially rectangular plate shape in plan view, and the translucent conductive layer 12, the photoelectric conversion layer 13, and the back surface provided on the back side of the translucent insulating substrate 11. The electrode layer 14 is patterned into a predetermined shape, whereby grooves 15 to 17 called separation lines are formed at predetermined positions.

  The groove 15 provided in the translucent conductive layer 12 is embedded by the photoelectric conversion layer 13, and the groove 16 provided in the photoelectric conversion layer 13 is embedded by the back electrode layer 14. Further, the groove 17 provided continuously to the photoelectric conversion layer 13 and the back electrode layer 14 is filled with the adhesive layer 31 described above.

  As described above, the photoelectric conversion layer 13 is sandwiched between the translucent conductive layer 12 and the back electrode layer 14, and the translucent conductive layer 12 and the back electrode layer 14 adjacent thereto are connected at the portion where the groove 16 is formed. As a result, the individual photoelectric conversion layers 13 divided by the grooves 17 are connected in series to form a power generation circuit.

  On the other hand, the light emitting element assembly 20 includes a light emitting element 22 and a circuit board 21 on which the light emitting element 22 is mounted. The light emitting elements 22 are arranged in an array on the front side of the circuit board 21 (see FIG. 1). The front side of the circuit board 21 on which the light emitting element 22 is mounted is covered with the adhesive layer 31 described above.

  As shown in FIGS. 1 and 3, a portion of the thin film solar cell assembly 10 facing the light emitting elements 22 arranged in an array has light projection window portions 18 corresponding to the individual light emitting elements 22. Is provided. As shown in FIG. 3, the light projection window 18 is formed by cutting out the photoelectric conversion layer 13 and the back electrode layer 14 of the thin film solar cell assembly 10. The adhesive layer 31 is embedded.

  With the above configuration, only the light-transmitting adhesive layer 31, the light-transmitting conductive layer 12, and the light-transmitting insulating substrate 11 are positioned on the front surface side of the light-emitting element 22. The light emitted from 22 is led out from the light receiving surface side of the solar cell module 1 </ b> A to the outside of the solar cell module 1 </ b> A through the light projection window 18 provided in the thin film solar cell assembly 10. Therefore, by arranging the light emitting elements 22 densely, it is possible to give an impression as if the entire light receiving surface of the solar cell module 1A is emitting light. Here, in the solar cell module 1A in the present embodiment, since the thin film solar cell is used as the solar cell, it is possible to arrange the light emitting elements 22 more densely than the solar cell using crystalline silicon. Is possible. Therefore, by adopting the above configuration, a light-emitting solar cell module excellent in illumination properties, display properties, decoration properties, and the like can be obtained.

  FIG. 4 is a schematic diagram for explaining how large the light projecting window portion is preferably when the illumination efficiency is improved in the solar cell module according to the present embodiment.

  When the light emitting element 22 is configured by an LED, as shown in FIG. 4, there is generally a directivity angle θ that defines a direction in which light is efficiently irradiated. The directivity angle θ defines a range in which the ratio of the luminance of light emitted from the LED to the peak value of the luminance is not less than 0.3, and defines a predetermined angle range centered on the optical axis A. To do. In order to improve the illumination efficiency, it is preferable that the size of the light projecting window portion 18 is equal to or larger than the size that allows the light emitted within the angle range defined by the directivity angle θ to be transmitted.

  That is, as shown in FIG. 4, as the width X of the light projecting window 18, when the LED is assumed to be a point light source, the light emission position P (here, the point where the LED has the strongest luminance is the light emission position) X ≧ using the distance x between the points P1 and P2, which is the point where light passing through both ends of the region represented by the directivity angle θ among the light emitted from the point P2 reaches the translucent conductive layer 12 It is preferable to satisfy the condition represented by x. Here, the distance x between the point P1 and the point P2 is expressed by x = 2Ztan (θ / 2) using the distance Z between the light emitting position P and the translucent conductive layer 12. For this reason, the width X of the light projecting window portion 18 only needs to satisfy the condition of X ≧ 2Ztan (θ / 2).

  By setting the light projection window 18 so as to satisfy the above conditions, it is possible to achieve high illumination efficiency. In consideration of the assembly accuracy of the thin-film solar cell assembly 10 and the light-emitting element assembly 20, it is preferable to leave a margin slightly larger than the above conditions.

  The present inventor actually made a prototype of the light-emitting solar cell module having the above-described configuration, and verified how it looks when the prototyped light-emitting solar cell module emits light. This will be described in detail below as an example.

  FIG. 5 to FIG. 8 are diagrams showing a manufacturing process when the solar cell module is actually prototyped in the examples based on the present embodiment. Moreover, FIG. 9 is a figure which shows the circuit structure of the light emitting element assembly which concerns on a present Example.

First, as shown in FIG. 5, a glass substrate having a size of 650 mm × 910 mm square and a thickness of 4.0 mm is used as the translucent insulating substrate 11, and thermal CVD (Chemical CVD) is formed on the glass substrate as the translucent conductive layer 12. An SnO ₂ (tin oxide) film was formed by the Vapor Deposition method. Next, patterning of the SnO ₂ film was performed using the fundamental wave (wavelength: 1064 nm) of a YAG (yttrium, aluminum, garnet) laser. At that time, the laser beam was irradiated from the glass substrate side, and the SnO ₂ film was separated into strips to form separation lines as the grooves 15. Thereafter, the glass substrate on which the SnO ₂ film was formed was ultrasonically cleaned with pure water.

Next, as shown in FIG. 6, a hydrogenated amorphous silicon film was formed as a photoelectric conversion layer 13 on the SnO ₂ film by a plasma CVD method. Here, the hydrogenated amorphous silicon film was formed as a three-layer structure of p-type amorphous silicon carbide, i-type amorphous silicon, and n-type amorphous silicon, and the total film thickness was adjusted to about 100 nm to 600 nm. In addition, the photoelectric conversion layer 13 may have a tandem structure of amorphous silicon, or a tandem structure made of amorphous silicon and microcrystalline silicon. The thickness at that time can be appropriately changed.

Subsequently, the hydrogenated amorphous silicon film was patterned using the second harmonic (532 nm) of a YAG laser excellent in transparency to the SnO ₂ film. At that time, the laser beam was irradiated from the glass substrate side, and the hydrogenated amorphous silicon film was separated into strips to form separation lines as the grooves 16. Here, the reason why the second harmonic of the YAG laser is used for patterning the hydrogenated amorphous silicon film is to prevent damage to the already patterned SnO ₂ film.

Next, as shown in FIG. 7, a ZnO (zinc oxide) film / Ag (silver) film was formed as a back electrode layer 14 on the hydrogenated amorphous silicon film by magnetron sputtering. At this time, the total thickness of the ZnO film / Ag film was about 300 nm to 1000 nm. As the back electrode layer 14, a film having excellent translucency such as an ITO film (indium tin oxide film) or a SnO ₂ film may be used instead of the above ZnO film, or an Al film instead of the above Ag film. A highly reflective film such as (aluminum) may be used. Alternatively, the back electrode layer 14 may be formed using an electron beam evaporation method or the like.

Subsequently, patterning of the ZnO film / Ag film and the hydrogenated amorphous silicon film was performed using the second harmonic of a YAG laser excellent in transparency to the SnO ₂ film. At that time, the laser beam was irradiated from the glass substrate side, and the ZnO film / Ag film and the hydrogenated amorphous silicon film were separated into strips to form separation lines as the grooves 17. Here, the reason why the second harmonic of the YAG laser is used for patterning of the ZnO film / Ag film and the hydrogenated amorphous silicon film is to prevent damage to the already patterned SnO ₂ film.

Next, a mask having a predetermined opening shape is set on the front surface side of the glass substrate, and a ZnO film / Ag film and a hydrogenated amorphous film are formed using the second harmonic of a YAG laser having excellent transparency to the SnO ₂ film. The silicon film was subjected to additional patterning as shown in FIG. 8 to form a light projection window 18. In forming the light projection window 18, in addition to the laser irradiation as described above, a known technique such as a method of printing a resist or the like and then performing chemical etching may be used. In order to minimize the output drop of the thin-film solar battery, it is preferable to uniformly arrange the light projecting window portions 18 with respect to the adjacent strip-shaped solar battery cells.

  Here, in this trial manufacture, the size of the light projection window portion 18 was formed so as to satisfy the conditions described in FIG. That is, referring to FIG. 4, the width X of the light projecting window portion 18 is formed so as to satisfy the condition of X ≧ 2Ztan (θ / 2). Specifically, a chip LED having a directivity angle θ = 120 ° is used as the light emitting element 22, and the distance Z between the light emitting position P and the translucent conductive layer 12 is set to 1.1 mm. The width X of the portion 18 needs to satisfy the condition of X ≧ 3.81 mm. In addition to satisfying this condition and considering the assembly accuracy of the thin film solar cell assembly and the light emitting element assembly, the shape of the light projecting window portion 18 was a rectangular shape of 5.0 mm square.

  In consideration of actual product design such as a manufacturing process, the minimum dimension of the width X of the light projecting window portion 18 is the directivity angle θ = 80 °, the light emitting position P, and the translucent conductive layer 12. In this case, the width X of the light projecting window 18 is 0.8391 mm. Considering the assembly accuracy of the thin film solar cell assembly and the light emitting element assembly, it is assumed that the minimum dimension of the width X of the light projecting window portion 18 is approximately X = 2.00 mm.

  After the formation of the light projection window, the glass substrate was cut into a 300 mm square shape, subjected to ultrasonic cleaning, and then dried to obtain a thin film solar cell assembly.

  Separately from the above process, a three-layer film made of PET (polyethylene terephthalate) / Al / PET used for a back film of a thin film solar cell is used as a substrate of a circuit board, and a chip LED as a light emitting element is mounted on this A light emitting device assembly was manufactured. Specifically, an aluminum foil having a thickness of about 10 μm is adhered to both surfaces of a three-layer film made of PET / Al / PET using an adhesive, and a photosensitive film as a resist material is adhered thereon to form a circuit pattern. Then, the photosensitive film was removed by etching, and necessary circuit patterns were formed on both sides of a three-layer film made of PET / Al / PET. By arranging the chip LEDs in a matrix at a pitch of 30 mm on the circuit board thus obtained, 10 chip LEDs were arranged in series and 8 light-emitting element assemblies connected in parallel were obtained.

  Here, the circuit configuration of the light emitting element assembly is as shown in FIG. A battery is used as the power source 23 shown in FIG. 9, and a chip resistor is used as the resistor 24. For mounting the chip LED and the chip resistor, a mounting silver paste is used, but a mounting aluminum paste or the like can also be used.

  The thin-film solar cell module and the light-emitting element assembly manufactured through such a process are bonded by using an adhesive containing an EVA resin as a main component as a translucent adhesive, whereby a light-emitting solar cell module Got. At this time, as an adhesive containing EVA resin as a main component, a low-temperature cross-linking adhesive that cross-links at 130 ° C. was used.

  In the present embodiment, as shown in FIG. 10, a plurality of solar cell modules 1A ′ on which chip LEDs that emit white light are mounted and solar cell modules 1A ″ on which chip LEDs that emit red light are mounted. It was made into an electric light board that can express characters by arranging and arranging them in a matrix, and at night, all the solar cell modules were turned on and viewed from a position about 100 m away. It was visually confirmed that the entire solar cell module was emitting light, and it was confirmed that the characters were clearly confirmed.

  In the above-described embodiment, the solar cell module that emits white light is also disposed in the blank portion other than the portion that expresses the character. However, when it is not necessary to emit the blank portion, the non-light emitting portion is not included in this portion. It is good also as arrange | positioning a light emission type solar cell module.

  In the solar cell module 1A in the above-described embodiment, the light projecting window portion 18 is formed by cutting out the photoelectric conversion layer 13 and the back electrode layer 14 in a portion facing the portion where the light emitting element 22 is disposed. The case where it is configured has been described as an example, but in addition to the photoelectric conversion layer 13 and the back electrode layer 14, the light-transmitting conductive layer 12 corresponding to the portion where the light emitting element 22 is disposed is further cut away. It is good also as a structure.

  Moreover, in the solar cell module 1A in the above-described embodiment, the case where the shape of the light projecting window portion 18 is rectangular is illustrated, but it may be a perfect circle shape, an elliptical shape, a triangle, or the like. However, when the positional accuracy at the time of assembly is taken into consideration, the rectangular shape is preferable as described above.

(Embodiment 2)
FIG. 11 is a schematic view when the solar cell module according to Embodiment 2 of the present invention is viewed from the front side, and FIG. 12 is a schematic cross-sectional view of a part of the solar cell module according to this embodiment. In addition, the same code | symbol is attached | subjected in the figure about the part similar to the solar cell module in the above-mentioned Embodiment 1, and the description is not repeated here.

  The solar cell module 1B in the present embodiment is the solar cell module 1A in the above-described first embodiment, and is completed as a thin film solar cell assembly as it is without cutting a plurality of glass substrates after the formation of the solar cells. Six light emitting element assemblies are attached to the back side. That is, as shown in FIG. 11, six light emitting element assemblies 20 are arranged side by side on the back side of the thin film solar cell assembly 10. As shown in FIG. 12, a back-side support substrate 27 is bonded to the surface of each light-emitting element assembly 20 opposite to the light-emitting surface side of the circuit board 21 via an adhesive layer 26. Thereby, the individual circuit boards 21 are supported from the back side by the back side support board 27.

  By adopting such a structure, the light emitting element assembly can be easily attached even to a large-sized thin film solar cell assembly, so that a large-area solar cell module can be easily manufactured. Therefore, it is possible to provide a large light emitting solar cell module at a low cost.

  The present inventor actually made a prototype of the light-emitting solar cell module having the above-described configuration, and verified how it looks when the prototyped light-emitting solar cell module emits light. Specifically, a three-layer plate-like member made of PET / Al / PET is used as the back side support substrate 27, and this is adhered to the back side of the circuit board 21 using an adhesive containing EVA as a main component. . It was confirmed that characters and the like can be expressed by mounting chip LEDs capable of emitting various colors on the circuit board 21 and connecting a control circuit for controlling the light emission of these chip LEDs. In addition, when RGB chip LED was utilized as a light emitting element, it confirmed that expression of gradation etc. was attained.

(Embodiment 3)
FIG. 13 is a schematic view when the solar cell module according to Embodiment 3 of the present invention is viewed from the front side, and FIG. 14 is a schematic cross-sectional view of a part of the solar cell module according to this embodiment. In addition, the same code | symbol is attached | subjected in the figure about the part similar to the solar cell module in above-mentioned Embodiment 2, and the description is not repeated here.

  The solar cell module 1C in the present embodiment is prepared by preparing two solar cell modules 1B in the above-described second embodiment and pasting them on the front-side support substrate. That is, as shown in FIGS. 13 and 14, the front-side support substrate 33 is disposed on the front side that is the light-receiving surface side of the solar cell module 1B, and the front-side support substrate 33 and the solar cell module 1B are translucent. The two solar cell modules 1 </ b> B are configured to be supported by the front-side support substrate 33 by being bonded via the adhesive layer 32.

  By adopting such a structure, it becomes possible to easily manufacture a large-area solar cell module. Therefore, it is possible to provide a large light emitting solar cell module at a low cost. For example, if a glass substrate is used as the front-side support substrate 33, a light-emitting solar cell module of 1 m × 1 m square or more can be obtained.

(Embodiment 4)
FIG. 15 is a schematic diagram when the solar cell module according to Embodiment 4 of the present invention is viewed from the front side, and FIG. 16 is an XVI-XVI line shown in FIG. 15 of the solar cell module according to this embodiment. It is a schematic cross section along the line. In addition, the same code | symbol is attached | subjected in the figure about the part similar to the solar cell module in the above-mentioned Embodiment 1, and the description is not repeated here.

  As shown in FIGS. 15 and 16, solar cell module 1 </ b> D in the present embodiment is different in that the shape of solar cell module 1 </ b> A in the first embodiment described above and light projecting window portion 18 are different. That is, the solar cell module 1A in the above-described first embodiment exemplifies a case where the light projection window 18 is individually formed corresponding to the light emitting elements 22 arranged in an array. In solar cell module 1D in the embodiment, light projecting window portions 18 are formed in stripes corresponding to each row of light emitting elements 22 arranged in an array. The formation of the light projection window 18 is preferably performed by laser scanning without using a mask. Moreover, as the circuit board 28 on which the light emitting element 22 is mounted, a translucent insulating substrate having a circuit pattern formed on the surface thereof was used.

  With this configuration, a mask is not required for forming the light projecting window, so that the light projecting window can be easily formed, and a light emitting solar cell module can be provided at low cost. . In addition, since the circuit board on which the light emitting element is mounted is light-transmitting, light can be transmitted through the circuit board, and can be used as a daylighting solar cell module.

  The inventor actually made a prototype of the light-emitting solar cell module having the above-described configuration. As a circuit board, a 300 mm square rectangular glass substrate was used as a base material, and a circuit similar to the example in the first embodiment was formed. The circuit pattern is formed by sputtering a Cr (chrome: thickness: 0.1 μm) film, a Cu (copper: thickness: 3.0 μm) film, and an Ag (silver: 0.2 μm) film using a predetermined mask on a glass substrate. This was carried out by forming a laminated film in this order. At this time, the metal film to be laminated may use other metals such as tin. Further, as a film forming method, after forming a film of several microns by sputtering, the film thickness may be increased by using plating, or by printing a high-temperature firing type silver paste. Cream solder was used for mounting chip LEDs and chip resistors. An adhesive containing EVA as a main component was used for bonding the front support substrate. The width of the striped light projection window was 5 mm.

  It was confirmed that the light emitting solar cell module manufactured in this way was turned on at night to visually recognize the entire solar cell module as emitting light. In addition, in the daytime, the circuit board, the back-side support board, and the front-side support board are each formed of a glass substrate, so that the light incident from the front side of the solar cell module can be used as a striped projection window. It entered through the inside of a solar cell module via, and it was confirmed that it permeate | transmits to the back side of a solar cell module except the part in which chip | tip LED was mounted. That is, it was confirmed that the light-emitting solar cell module configured as described above also functions as a daylighting solar cell module.

  17 and 18 are diagrams showing a modification of the solar cell module in the present embodiment. Here, FIG. 17 is a schematic view of the solar cell module according to this modification as viewed from the front side, and FIG. 18 is along the line XVIII-XVIII shown in FIG. 17 of the solar cell module according to this modification. FIG.

  As shown in FIGS. 17 and 18, in the solar cell module 1 </ b> E according to this modification, a slit-shaped lighting window portion 19 is formed in a portion other than the portion where the light projection window portion 18 is formed. Is. Such a solar cell module is generally called a see-through solar cell. The width of the daylighting window 19 is preferably set to a width of about 0.04 mm to 1 mm. The number of the daylighting window portions 19 may be appropriately designed in consideration of output as a solar cell module, unsatisfactoryness, and the like.

  FIG. 19 is a diagram showing another modification of the solar cell module according to the present embodiment, and is a schematic diagram when the solar cell module according to this modification is viewed from the front side. A solar cell module 1F shown in FIG. 19 is obtained by changing the solar cell module 1A prototyped in Embodiment 1 into a see-through solar cell module, and its structure is similar to that of the solar cell module 1E shown in FIGS. However, it differs from the solar cell module 1E shown in FIGS. 17 and 18 in that the light projecting window 18 is individually provided corresponding to the light emitting elements 22 arranged in an array.

(Embodiment 5)
FIG. 20 is a schematic cross-sectional view showing the structure of the end portion of the solar cell module according to Embodiment 5 of the present invention. In addition, the same code | symbol is attached | subjected in the figure about the part similar to the solar cell module in the above-mentioned Embodiment 1, and the description is not repeated here.

  As shown in FIG. 20, the thin film solar cell assembly 10 of the solar cell module 1H in the present embodiment is a thin film solar cell and an intermediate substrate 35 bonded to the back side of the thin film solar cell using an adhesive. A translucent insulating substrate. As the adhesive, a translucent adhesive is used. Therefore, the solar battery cell is sealed by the translucent adhesive layer 34. As the circuit board 21 of the light emitting element assembly 20, for example, a glass epoxy board is used, and the circuit board 21 is bonded to the back support substrate 27 via the adhesive layer 26, thereby forming the light emitting element assembly 20. Yes.

  In solar cell module 1H in the present embodiment, thin-film solar cell assembly 10 and light-emitting element assembly 20 formed in this way are fixed at the end via a spacer / adhesive layer as a frame. Specifically, for example, the spacer member 41 containing the desiccant 42 and a seal member 43 provided so as to surround the spacer member 41 are bonded and fixed, and a protective tape 44 as a protective member is attached to the outside thereof. As the desiccant 42, synthetic zeolite or the like is suitable, and as the spacer member 41, an aluminum alloy or the like is suitable. Further, when a two-layer structure is employed as the sealing material 43, butyl, polyisobutylene, etc. are suitable as the primary sealing material, and hot melt butyl, silicone, etc. are suitable as the secondary sealing material. Moreover, as the protective tape 44, a butyl tape or a waterproof tape generally used for building materials can be used. In some cases, it is possible to eliminate the primary sealing material and the protective tape.

  As described above, the thin-film solar cell assembly 10 and the light-emitting element assembly 20 are bonded via the spacer / adhesive layer as a frame, so that an air layer is formed between the thin-film solar cell assembly 10 and the light-emitting element assembly 20. 36 will be formed. With this configuration, a heat insulating layer can be formed by the air layer 36. Therefore, when the solar cell module 1H in the present embodiment is used as a composite glass type solar cell module, condensation and the like are prevented. Is possible.

  Further, as described above, the thin-film solar cell assembly 10 and the light-emitting element assembly 20 are joined to each other through the spacer / adhesive layer as a frame, so that the thin-film solar cell assembly 10 and the light-emitting element assembly 20 are separated. Therefore, the loss of material can be minimized, and when either one of the thin-film solar cell assembly 10 and the light-emitting element assembly 20 is damaged, the frame can be used as a frame. By cutting the seal by the spacer / adhesive layer, it is possible to replace only the damaged assembly.

  FIG. 21 is a schematic cross-sectional view showing the structure of the end portion of the solar cell module according to the modification based on the present embodiment. As shown in FIG. 21, in the solar cell module 1 </ b> I according to this modification, the end portion is sealed and fixed only by the frame body 45. In other words, the frame 45 is provided with holding portions 45a and 45b that sandwich and hold the thin-film solar cell assembly 10, and is also provided with holding portions 45c and 45d that sandwich and hold the light emitting element assembly 20, thereby Fixing can be performed. As the frame, for example, one made of an aluminum alloy can be used.

  FIG. 22 is a schematic cross-sectional view showing the structure of the end portion of the solar cell module according to another modification based on the present embodiment. As shown in FIG. 22, in the solar cell module 1 </ b> J according to the present modification, the above-described holding portions 45 a and 45 d are provided in the frame 45, and the holding portion is provided between the thin-film solar cell assembly 10 and the light emitting element assembly 20. The light emitting element assembly 20 is firmly attached to the frame body 45 by providing a hole 45e so as to penetrate the holding portion 45e and the holding portion 45d, and inserting and fastening a fastening member 46 such as a screw into the hole. It becomes possible to fix.

  The above-described embodiments disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a schematic diagram at the time of seeing the solar cell module in Embodiment 1 of this invention from the front side. It is a schematic cross section along the II-II line shown in FIG. It is a schematic cross section along the III-III line shown in FIG. It is a schematic diagram for demonstrating how large it is preferable to make a light projection window part in the case of aiming at improvement of illumination efficiency in the solar cell module according to Embodiment 1 of the present invention. In the Example based on Embodiment 1 of this invention, it is a figure which shows the manufacturing process at the time of actually prototyping a solar cell module. In the Example based on Embodiment 1 of this invention, it is a figure which shows the manufacturing process at the time of actually prototyping a solar cell module. In the Example based on Embodiment 1 of this invention, it is a figure which shows the manufacturing process at the time of actually prototyping a solar cell module. In the Example based on Embodiment 1 of this invention, it is a figure which shows the manufacturing process at the time of actually prototyping a solar cell module. It is a figure which shows the circuit structure of the light emitting element assembly which concerns on the Example based on Embodiment 1 of this invention. It is a schematic diagram at the time of seeing the electric light board manufactured in the Example based on Embodiment 1 of this invention from the front side. It is a schematic diagram at the time of seeing the solar cell module in Embodiment 2 of this invention from the front side. It is a schematic cross section of a part of the solar cell module according to Embodiment 2 of the present invention. It is a schematic diagram at the time of seeing the solar cell module in Embodiment 3 of this invention from the front side. It is a schematic cross section of a part of the solar cell module according to Embodiment 3 of the present invention. It is a schematic diagram at the time of seeing the solar cell module in Embodiment 4 of this invention from the front side. FIG. 16 is a schematic cross-sectional view along the line XVI-XVI shown in FIG. 15. It is the schematic diagram which looked at the solar cell module which concerns on the modification based on Embodiment 4 of this invention from the front side. It is a schematic cross section along the XVIII-XVIII line shown in FIG. It is the schematic diagram which looked at the solar cell module which concerns on the other modification based on Embodiment 4 of this invention from the front side. It is a schematic cross section which shows the structure of the edge part of the solar cell module in Embodiment 5 of this invention. It is a schematic cross section which shows the structure of the edge part of the solar cell module which concerns on the modification based on Embodiment 5 of this invention. It is a schematic cross section which shows the structure of the edge part of the solar cell module which concerns on the other modification based on Embodiment 5 of this invention.

Explanation of symbols

  1A-1J Solar cell module, 10 Thin film solar cell assembly, 11 Translucent insulating substrate, 12 Translucent conductive layer, 13 Photoelectric conversion layer, 14 Back electrode layer, 15-17 Groove, 18 Light projection window, 19 Daylighting window, 20 Light-emitting element assembly, 21, 28 Circuit board, 22 Light-emitting element, 23 Power supply, 24 Resistance, 26, 31, 32, 34 Adhesive layer, 27 Back support substrate, 33 Front support substrate, 35 Intermediate Substrate, 36 air layer, 41 spacer member, 42 desiccant, 43 sealing material, 44 protective tape, 45 frame, 45a-45e holding part, 46 fastening member.

Claims (15)

A thin-film solar cell assembly including a translucent insulating substrate, a translucent conductive layer, a photoelectric conversion layer, and a back electrode layer;
A light emitting element assembly including a light emitting element and a circuit board on which the light emitting element is mounted,
The light emitting element assembly is disposed such that a light emitting surface thereof faces a main surface opposite to a light receiving surface of the thin film solar cell assembly,
A portion of the photoelectric conversion layer and the back electrode layer that are opposed to the portion where the light emitting element is disposed are notched so that a light projecting window that transmits light emitted from the light emitting element is provided in the thin film solar cell. A solar cell module provided in the assembly.   The light projecting window portion has a size through which light emitted from at least an angle range defined by a directivity angle of the light emitting element among light emitted from the light emitting element is transmitted. Item 2. The solar cell module according to Item 1. A plurality of the light emitting elements are arranged in an array on the circuit board,
The solar cell module according to claim 1, wherein the light projecting window is individually provided corresponding to each of the plurality of light emitting elements. A plurality of the light emitting elements are arranged in an array on the circuit board,
The solar cell module according to claim 1 or 2, wherein the light projecting window is provided in a stripe shape corresponding to each row or each column of the plurality of light emitting elements arranged in an array. .   A part of the photoelectric conversion layer and a part of the back electrode layer corresponding to a part where the light emitting element is not disposed are cut out so that a part of the light irradiated on the light receiving surface is transmitted. The solar cell module according to claim 1, wherein a portion is provided in the thin film solar cell assembly.   The solar cell module according to any one of claims 1 to 5, wherein the thin-film solar cell assembly and the light-emitting element assembly are bonded with a translucent adhesive.   The solar cell module according to claim 6, wherein the translucent adhesive is an adhesive containing an ethylene vinyl acetate copolymer (EVA) resin as a main component.   The thin-film solar cell assembly and the light-emitting element assembly are joined to each other through a spacer at an end thereof, so that an air layer is provided between the thin-film solar cell assembly and the light-emitting element assembly. Item 6. The solar cell module according to any one of Items 1 to 5.   The solar cell module according to claim 1, wherein the circuit board is a light-transmitting substrate.   The solar cell module according to claim 9, wherein the circuit board is a glass substrate or a polyethylene terephthalate (PET) substrate.   The light-emitting element assembly includes a plurality of the circuit boards on which the light-emitting elements are mounted, and has a back-side support board that supports the plurality of circuit boards on the side opposite to the light-emitting surface side of the plurality of circuit boards. The solar cell module according to any one of claims 1 to 9.   The solar cell module according to claim 11, wherein the back-side support substrate is made of a translucent plate-like member.   The thin-film solar cell assembly includes a plurality of the light-transmitting insulating substrates and a front-side support substrate that supports the plurality of light-transmitting insulating substrates on the light-receiving surface side. The solar cell module in any one.   The solar cell module according to claim 13, wherein the front-side support substrate is made of a light-transmitting plate member.   The solar cell module according to any one of claims 1 to 14, wherein the thin-film solar cell assembly and the light-emitting element assembly are fixed via a frame.

Images