JP3919468B2 - Thin film solar cell module and thin film solar cell panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thin-film solar cell module and a thin-film solar cell panel in consideration of surface appearance.
[0002]
[Background Art and Problems to be Solved by the Invention]
Conventionally, the surface color of a solar cell module is limited to, for example, black or blue-violet when the solar cell is a crystal system, and brown when the solar cell is an amorphous system, and the panel surface (light receiving surface) is configured with one color. Usually it is. As a result, there has been a situation in which solar cell panels constituted by these solar cell modules are very dry and only give people an impression that they are not killed. Therefore, various ideas have been made.
[0003]
For example, in the case of a crystalline solar cell, a solar cell module has been invented in which the solar cells are colored by arranging solar cells at regular intervals and coloring the back surface sealing material or the like. However, the size of the solar battery cell itself is large, and when viewed from the light receiving surface side, that is, the front surface side, there is also a color of the cell itself, and the effect of coloring the back surface sealing material is not so large. Furthermore, when coloring the crystal cell itself, the appearance of the solar cell module is also excellent in the method of obtaining a solar cell module having a coloring effect due to the light interference effect by changing the film thickness of the antireflection film on the cell surface. I couldn't say that. Even in amorphous thin-film solar cell modules, light-transmissive solar cells are used to color the opposite side of the light-receiving surface, that is, the back side in various ways to give colors to the back side, such as letters and patterns. It was displayed. Recently, however, development of building material-integrated thin-film solar cell modules has become active, and design characteristics when viewed from the surface side are important for the purpose of improving the overall design of the building and harmonizing with the building landscape. It is becoming. However, the present state is that the above-described light-transmissive solar cell has not been colored and has a good design when viewed from the front side.
[0004]
For example, as shown in FIG. 12, in the thin film solar cell described in Japanese Utility Model Laid-Open No. 1-71453, a photoelectric conversion layer made of an amorphous Si-based semiconductor is formed after the transparent conductive film 102 is removed to draw characters and the like. Since 104 is formed, the removed portion 103 of the transparent conductive film 102 exhibits a reddish brown color, and the region other than the removed portion 103 exhibits a slightly dark reddish brown color. However, colors other than reddish brown cannot be shown, and it cannot be said that the appearance is excellent in design. In addition, since the transparent conductive film 102 is first removed, an electrically isolated region is likely to be generated. If the region is eliminated, wiring is complicated, and if such an isolated region is not formed from the beginning. In the process of manufacturing a thin film solar cell, the result is complicated.
[0005]
The present invention has been made to solve the above-described problems, and is a thin-film solar cell excellent in appearance and design having characters, symbols, patterns and the like colored in a desired color when viewed from the front side. It aims at providing a module and a thin film solar cell panel.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the thin-film solar cell module of the present invention comprises:
A transparent electrode layer, a photoelectric conversion layer, and a back electrode layer are laminated in this order on a transparent insulating substrate, and at least the back electrode layer and the photoelectric conversion layer among the transparent electrode layer, the photoelectric conversion layer, and the back electrode layer. A thin film solar cell having a plurality of openings therethrough;
An opaque back surface sealing material provided on the opposite side of the light receiving surface of the thin film solar cell,
In the thin film solar cell module in which the opening exhibits a desired color when viewed from the light receiving surface side,
The plurality of openings include a plurality of linear openings having different straight line widths or different distances between the straight lines, and display colors in gradation using these linear openings. .
With this configuration, the solar cell surface (light-receiving surface) can have an appearance that is in harmony with the frame material for the solar cell and the surrounding environment. Since an arbitrary color can be displayed, an excellent design can be provided.
[0007]
A plurality of the openings can be combined to form a pattern. The “pattern” referred to here includes various characters, various codes, various graphics, and combinations thereof.
[0008]
Since the width of the straight line or the distance between the straight lines is made different, the color changing in gradation is displayed from a color having a strong hue in the opening to a color having a strong hue in the photoelectric conversion layer itself. be able to.
[0009]
The plurality of openings may include openings having a discontinuous shape. Examples of discontinuous shapes include rectangles, squares, ellipses, and circles. You may combine these shapes suitably. The discontinuous shape can be given to the one that looks more colored in the entire solar cell even with the same aperture ratio as compared with the case of a straight line. Various patterns can be expressed.
[0010]
If a linear opening and such a discontinuous opening are combined, the degree of freedom in design is greatly improved.
[0011]
In order for human eyes to reliably recognize the color exhibited by the opening, the width of the opening is desirably 75 μm or more, and more desirably 150 μm or more. Here, the “width of the opening” means the width of the straight line when the opening has a straight shape, and the shorter length (diameter) when the opening has a discontinuous shape. .
[0012]
Considering the performance of the thin-film solar cell, the area ratio of the opening to the effective light receiving area of the thin-film solar cell is desirably 50% or less.
[0013]
In one embodiment, the color exhibited by the opening is the color of the opaque backside sealing material. In this case, a weather-resistant film such as a polyethylene terephthalate (hereinafter referred to as PET) film or a fluorine-based film colored in a desired color can be used as the back surface sealing material. Alternatively, the color of the metal contained in the back surface sealing material can be used for reasons such as moisture resistance and fire spread prevention. In any case, since the back surface sealing material is used as a so-called coloring material for the opening, the opening can be colored without complicating the manufacturing process.
[0014]
In one embodiment, the color exhibited by the opening is the color of an adhesive for bonding the back surface sealing material to the back electrode layer. As such an adhesive, there is a colored ethylene vinyl acetate (hereinafter referred to as EVA) film. Also in this case, the coloring of the opening can be realized without complicating the manufacturing process of the solar cell module.
[0015]
A desired color may be displayed on the opening by applying a colored resist film on the back electrode layer and on the opening. Since the resist film coating process may be used in the manufacturing process of thin film solar cells to prevent oxidation of the back electrode, coloring the openings with a colored resist obtained by adding a pigment to the resist complicates the manufacturing process. It is not a thing. Further, a paint may be used in place of the colored resist film. The paint has a wide variety of colors and is inexpensive and can be easily colored.
[0016]
The thin film solar cell module may have means for irregularly reflecting light on the opposite side (back side) of the light receiving surface. By irregularly reflecting the light on the back side, the degree of color of the thin-film solar cell itself can be reduced, and when characters are displayed, the characters can be confirmed more clearly even from a distance. Moreover, the light absorption amount in a photoelectric converting layer can be increased with the material and color used as a means for irregular reflection, and a characteristic can be improved. A metal can be used as a means for such irregular reflection. Conventionally, metal has been used for a part of the laminated back surface sealing material for reasons such as moisture resistance and fire spread prevention, so that the manufacturing process is not complicated. Moreover, you may use the weather resistant film processed into the grid | lattice form. For example, a PET film, a fluorine film, etc. are mentioned. Conventionally, since these are used as a back surface sealing material, the manufacturing process is not complicated.
[0017]
In the solar cell panel in which a large number of thin film solar cell modules are arranged in the vertical and horizontal directions, at least a part of these thin film solar cell modules is a thin film solar cell module having any one of the above-described configurations, thereby providing a panel surface. A desired pattern can be displayed on the screen.
[0018]
By combining solar cells having different aperture ratios within a range of 0 to 50% of the aperture area ratio (hereinafter referred to as aperture ratio) with respect to the effective light receiving area of the thin film solar cell, the panel area having a large aperture ratio is colored. By utilizing the fact that the color tone of the photoelectric conversion layer becomes strong in the region where the aperture ratio is small, the design can be expressed with a color having gradation (shading).
[0019]
Further, a pattern may be displayed on the front side (light receiving surface side) using thin film solar cell modules having different colors exhibited by the openings.
[0020]
By arbitrarily changing the color and aperture ratio of the opening of the thin-film solar cell module, it is possible to combine a variety of different colors and shades, and to express a more precise full-color design. .
[0021]
Since the operating current of thin-film solar cells with integrated cells changes in proportion to the area of a single cell, thin-film solar cells with different aperture ratios have an operating current that is equal to the aperture ratio when the number of integrated cells is the same. Depending on. Therefore, when these thin film solar cells having different aperture ratios are connected in series, the operating point of each thin film solar cell is shifted from the maximum operating point. Therefore, in a solar cell panel in which a large number of thin film solar cell modules having different aperture ratios are arranged in the vertical and horizontal directions, thin film solar cell modules having the same aperture ratio are connected in series, and the thin film solar cell modules having different aperture ratios are connected in series. Are connected in parallel, the maximum power of each thin film solar cell can be obtained.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. However, the illustrated embodiment is merely an example, and the present invention is not limited to the embodiment.
[0023]
< Reference example 1>
Hereinafter, with reference to FIGS. Reference example The thin film solar cell module 1 will be described. Figure 1 Reference example FIG. 2 is a cross-sectional view taken along the line II-II and a cross-sectional view taken along the line III-III of FIG. In these drawings, 1 is a transparent insulating substrate, 2 is a transparent conductive film as a transparent electrode layer, 3 is a photoelectric conversion layer, 4 is a back electrode layer, 5 is an adhesive material, 6 is an opaque back surface sealing material, 7 Is a separation line of the transparent conductive film 2, 8 is a separation line of the photoelectric conversion layer 3, 9 is a separation line of the back electrode layer 4, and 10 is an opening. A thin film solar cell 11 a is constituted by the transparent insulating substrate 1 to the back electrode layer 4. Moreover, the area | region of the thin film solar cell 11a mutually isolate | separated by the said separation line comprises the cell. This thin film solar cell module is manufactured as follows.
[0024]
First, a glass substrate (size: 650 mm × 455 mm) having a thickness of about 4.0 mm is used as the transparent insulating substrate 1, and the transparent conductive film 2 is formed on the glass substrate 1 by a thermal CVD method. ₂ (Tin oxide) was formed into a film. Next, the transparent conductive film 2 was patterned using a fundamental wave of a YAG laser. By making laser light enter from the glass surface, the transparent conductive film 2 is separated into strips, and a separation line 7 is formed.
[0025]
Thereafter, the substrate from which the transparent conductive film was separated was subjected to ultrasonic cleaning with pure water, and a hydrogenated amorphous silicon film as the photoelectric conversion layer 3 was formed by plasma CVD. The photoelectric conversion layer 3 includes three layers of p-type amorphous silicon carbide, i-type amorphous silicon, and n-type amorphous silicon, and the total thickness is about 100 nm to 600 nm. Next, patterning of the photoelectric conversion layer 3 was performed using a laser. By making laser light enter from the glass surface, the photoelectric conversion layer 3 is separated into strips, and a separation line 8 is formed. At this time, in order to avoid damage to the transparent conductive film 2 by the laser, it is preferable to use a second harmonic of a YAG laser having good transparency to the transparent conductive film 2 as the laser.
[0026]
Next, ZnO (zinc oxide) / Ag as the back electrode layer 4 was formed by magnetron sputtering. At this time, the thickness of the back electrode layer 4 is about 300 nm to 1 μm. Instead of ZnO, a highly light-transmitting film such as ITO or SnO 2 may be used, and instead of Ag, a metal having a high reflectance such as Al may be used. Further, the method of forming the back electrode layer 4 may be an electron beam evaporation method. Thereafter, the back electrode layer 4 was patterned using a laser. By making laser light enter from the glass surface, the back electrode layer 4 is separated into strips, and a separation line 9 is formed. At this time, similarly to the patterning of the photoelectric conversion layer 3, in order to avoid damage to the transparent conductive film 2 by the laser, a second harmonic of a YAG laser having good transparency of the transparent conductive film 2 is used for the laser. It is good.
[0027]
Next, the opening 10 was patterned using a fundamental wave of a YAG laser. Each opening 10 is a straight line continuous in a direction perpendicular to the direction in which the separation lines 7, 8, 9 extend, and the width of the straight line is 450 μm and the distance between the straight lines is 1.13 mm. Using the pattern mask 14 in which the portion 13 is processed by a laser, the transparent conductive film 2, the photoelectric conversion layer 3, and the back electrode layer 4 are removed by making laser light incident from the glass surface, and the separation lines 7, 8 are removed. , 9 are formed in a number of openings 10 arranged in the extending direction. The mask 14 may be made of a material such as stainless steel or iron that does not transmit laser light, but it is preferable to perform a surface treatment so that the mask does not diffusely reflect the fundamental wave of the YAG laser. In addition, it is necessary to consider that the pattern mask 14 itself is distorted by the fundamental wave energy of the YAG laser and has a thickness that does not cause processing damage. At this time, the processing direction of the straight line of the opening 10 may be parallel to the direction in which the separation lines 7, 8, and 9 extend, not parallel to each other, and using the second harmonic instead of the fundamental wave of the YAG laser, Only the photoelectric conversion layer 3 and the back electrode layer 4 may be removed to form the opening 10. Further, as a method of forming the opening 10, instead of using laser processing, it may be formed using a photoresist and a chemical etching process.
[0028]
Thereafter, ultrasonic cleaning was performed in pure water, and after drying, a bus bar for taking out electricity was attached to the positive electrode and the negative electrode.
[0029]
Then, using transparent EVA as the adhesive material 5, an opaque back surface sealing material 6 is adhered to the back surface of the thin film solar cell 11 a obtained by the above-described process using a vacuum laminating apparatus, as shown in FIGS. A laminate 11 having a cross-sectional structure was obtained. At this time, a white PET / aluminum / PET laminated film was used as the opaque back surface sealing material 6. At this time, the adhesive material 5 may be PVB (polyvinylbital) or the like. Further, as the opaque back surface sealing material 6, a laminated film of polyethylene monofluoride or the like may be used. When viewed from the front side, the opening 10 was white and the characters XYZ could be displayed. At this time, the opening portion 10 is provided in the character portion in the present embodiment, but the opening portion 10 may be provided in a region other than the character portion to make the character appear. As for the terminal, the positive electrode and the negative electrode were respectively removed from the holes of the opaque back surface sealing material 6 so that they could be taken out via a terminal box adhered to the back plate. Finally, an aluminum frame 12 was attached to the laminate 11 to complete a thin film solar cell module.
[0030]
Book Reference example Then, it is an example which the opening part 10 exhibits white, Comprising: It is possible to change a color according to harmony with the surrounding environment, an individual's hope, etc. Further, as a method for coloring the opening 10, the film of the opaque back surface sealing material 6 was colored, but EVA or the like which is the adhesive material 5 may be colored. At this time, the film of the back surface sealing material is preferably white that does not interfere with the color of EVA coloring. Moreover, you may make it exhibit a metallic color using the transparent weather resistance film, for example, a laminated film of transparent PET / metal / PET, as the opaque back surface sealing material 6. At this time, aluminum, silver, gold, a galvanized steel plate or the like is used as the metal. The frame of the solar cell module is preferably aluminum in consideration of the fact that it is commonly used and the cost, and the aluminum frame 12 is also used in this embodiment. Further, after forming the opening 10, a colored resist or paint may be applied on the back electrode layer 4 and in the opening 10. At this time, as a coating method, a spray method, a roll coater, or a printing method can be used.
[0031]
By the way, without using the pattern mask 14, laser processing is performed so that the line width of the opening 10 on the glass substrate is 25 μm, 50 μm, 75 μm, 100 μm, 125 μm, 150 μm, 200 μm, 300 μm, and 400 μm, and the opaque back surface. A thin-film solar cell module was prepared by the same method as described above except that black PET / aluminum / PET was used as the sealing material 6. As a result, it was 75 μm or more that a black color could be confirmed in the opening 10. In order to confirm the coloring of the opening 10 more clearly, it was 150 μm or more. From this experimental result, it was found that the line width of the opening 10 is preferably 75 μm or more, more preferably 150 μm or more. Furthermore, even when the opening 10 is formed in a discontinuous shape such as a rectangle or a circle, the colored color on the back side can be recognized if the shorter length (diameter) is 75 μm or more.
[0032]
<Example 1 >
FIG. 5 shows an example. 1 It is a front view of the thin film solar cell module which concerns on. Reference example In FIG. 1, the characters are displayed using the pattern mask 14, and the linear openings 10 in the character portion are formed to have the same width. 1 Then, without using the pattern mask 14, the linear openings 10 having different widths are used in combination. Specifically, with the area of 15 cm as one processing condition, the opening 10 was manufactured to have a width of 100 μm in the region 25a, a width of 500 μm in the region 25b, a width of 150 μm in the region 25c, and a width of 300 μm in the region 25d. At this time, the regions 25a to 25d having different line widths have the same aperture ratio. Others Reference example Same as 1. In this example, a thin film solar cell module having a striped pattern as a whole could be produced by changing the width of the straight line.
[0033]
<Example 2 >
FIG. 6 shows an example. 2 It is a front view of a thin film solar cell module. Without using the pattern mask 14, the width of the straight line of the opening 10 is made constant at 400 μm with a width of about 5 cm as one processing condition region, a region 15a having a distance between straight lines of 1 mm, and a region having a distance between straight lines of 2 mm. A region 15c having a distance between straight lines of 15b and a region 15d having a distance between straight lines of 8mm was prepared. Others Reference example Same as 1. By changing the distance between the straight lines, a thin-film solar cell module having a gradation design that looks white in the area where the distance between the straight lines is short and looks reddish brown in the area where the distance between the straight lines is long could be produced.
[0034]
< Reference example 2 >
FIG. Reference example 2 It is a front view of a thin film solar cell module. Without using the pattern mask 14, the opening 10 was processed by a laser so that the shape of the opening 10 became a circle having a diameter of about 175 μm, and the opening ratio was about 30%. Others Reference example Same as 1. By doing so, the whole surface of the thin film solar cell module became whiter. In the present embodiment, the shape of the opening 10 is a circle, but it may be an ellipse, a rectangle, a square, or the like, and these shapes may be combined as appropriate. Further, the combination of such a shape and a straight line may be different.
[0035]
< Reference example 3 >
Without using the pattern mask 14, the width of the straight line of the opening 10 is 400 μm, the distance between the straight lines is 1.13 mm, and the thin film solar using a laminated film of black PET / aluminum / PET as the opaque back surface sealing material 6 56 battery modules 16, similarly, the straight line width of the opening 10 is 400 μm and the distance between the straight lines is 1.13 mm. However, as an opaque back surface sealing material 6, a white PET / aluminum / PET laminated film 178 thin film solar cell modules 17 using the above were produced. The configuration of these thin film solar cell modules is otherwise Reference example Same as 1. And these thin film solar cell modules 16 and 17 were arranged in 13 * 18 as shown in FIG. 8, and the thin film solar cell panel made into the array structure was installed. In the example shown in FIG. 8, the thin film solar cell panel displays the letters ABC on the surface side.
[0036]
<Example 3 >
Without using the pattern mask 14, the width of the straight line of the opening is kept constant at 400 μm, the number of straight lines is changed, and the thin film solar cell module 18 with an aperture ratio of 0% and the thin film solar cell module with an aperture ratio of 15% 19, 52, 104, and 52 thin-film solar cell modules 20 having an aperture ratio of 30% were prepared, respectively. The configuration of these thin film solar cell modules is otherwise Reference example Same as 1. And the thin film solar cell modules 18-20 produced in this way were arranged in 13 * 16 as shown in FIG. 9, and the thin film solar cell panel comprised by the array was installed. In the example shown in FIG. 9, the thin-film solar cell panel displays a striped pattern by gradation color display on the surface side.
[0037]
<Example 4 >
As the opaque back surface sealing material 6, a PET having a red color and a white color was used. Moreover, the thin film solar cell module which changed the number of the opening parts 10 and set the aperture ratio to 5, 10, 15, 30% without using the pattern mask 14 was produced, respectively. The configuration of these thin film solar cell modules is otherwise Reference example Same as 1. 20 thin-film solar cell modules 21 with an aperture ratio of 30% and red PET color, 20 thin-film solar cell modules 22 with an aperture ratio of 10% and red PET color, white PET film with an aperture ratio of 30% and white 110 thin-film solar cell modules 23, 60 thin-film solar cell modules 24 with a white PET color with an aperture ratio of 15%, 30 thin-film solar cell modules 25 with a white-open PET color with an aperture ratio of 5%, A total of 240 sheets were used to install solar cell panels arranged in an array of 15 × 16 as shown in FIG. In the example shown in FIG. 10, the solar cell panel displays a symbol (〒) and a striped pattern on the surface side.
[0038]
By the way, the above embodiment 3 , 4 In, a solar cell array, that is, a solar cell panel is configured by using several types of thin film solar cells having different aperture ratios. Since the operating current of thin-film solar cells with integrated cells changes in proportion to the area of a single cell, thin-film solar cells with different aperture ratios have different operating currents depending on the aperture ratio when the number of integrated stages is the same. Different. Therefore, when these thin film solar cells having different aperture ratios are connected in series, the operating point of each thin film solar cell is shifted from the maximum operating point. Accordingly, in a solar cell panel in which a large number of thin film solar cell modules having different aperture ratios are arranged in the vertical and horizontal directions, in order to obtain the maximum power of each thin film solar cell, the thin film solar cell modules having the same aperture ratio. Are connected in series, and thin film solar cell modules having different aperture ratios are optimally connected in parallel.
[0039]
Further, as shown in FIG. 11, the thin film solar cell modules 31, 32, and 33 having different aperture ratios can be freely arranged vertically and horizontally, and the solar cell modules having the same aperture ratio are connected in series by the wiring 26. Connected, solar cell module group 41 (three solar cell modules 31, 31, 31 connected by wiring 26), solar cell module group 42 (three solar cell modules 32, 32, 32 to each other) And the solar cell module group 43 (three solar cell modules 33, 33, 33 connected by the wiring 26) are formed and connected in parallel. In this way, it is possible to provide a thin film solar cell panel that can freely display characters, patterns, and the like.
[0040]
Examples 3 , 4 The thin-film solar cell panel is manufactured using only the thin-film solar cell module having the opening 10, but a conventional thin-film solar cell module having no opening 10 (opening ratio 0%) may be combined.
[0041]
< Reference example 4 >
Reference example 4 In this solar cell module, EVA / transparent PET / EVA / aluminum foil (glossy) / EVA / PET are prepared in this order as the opaque back surface sealing material 6 and bonded to the thin film solar cell 11a using a vacuum laminator. I let you. With such a structure, wrinkles approach the aluminum foil during lamination, so that light can be diffusely reflected and air bubbles can be prevented from being mixed at the interface between the PET and the aluminum foil. Reference example 4 Is otherwise Reference example Same as 1. By irregularly reflecting, the character part representing XYZ became clearer. In particular, the effect is high in a place where sunlight is exposed outdoors. In addition, the photocurrent was improved by about 2% on average compared to the case of using an aluminum foil (with gloss) that does not diffusely reflect.
[0042]
In addition, although aluminum was used for the metal in the back surface sealing material 6, silver, chromium, gold, or the like may be used. However, aluminum is preferable in consideration of cost and reflectance. Moreover, you may use the laminated | multilayer film of the weather resistant film processed into the grid | lattice form as a material to make irregular reflection. For example, a PET film, a fluorine film, etc. are mentioned. At this time, the color of PET is preferably white with high reflectance. Also, Reference example 4 It goes without saying that the above-described effect can be obtained even when a plurality of thin film solar cell modules are arranged to form a thin film solar cell panel.
[0043]
Example 1 4 In FIG. 2, the photoelectric conversion layer has a single structure, but it may be laminated like a tandem structure or a triple structure. Further, the drawings showing the above embodiments are schematic views, and it goes without saying that the effects (designability) of the present invention are clearer in actual thin film solar cell modules and thin film solar cell panels.
[0044]
【The invention's effect】
As is clear from the above, according to the present invention, the color displayed through the opening formed in the thin film solar cell can be arbitrarily changed, and the shape of the opening or the opening ratio by the opening can be changed. By changing the color tone, even if it is the same color, it can be harmonized with the surrounding environment, people's eyes are softened, signs for advertising and advertising (company names, logos and cities Multi-functional thin film solar cell module and thin film solar cell panel to which a display function that can be variously devised can be realized. In addition, the present invention can be applied to a solar battery mounted on a battery charger or the like of a mobile phone to display the name of the owner. Therefore, the usage applications of the present invention are diverse and the utility value is high.
[Brief description of the drawings]
[Figure 1] One reference example Thin film solar cell module according to Overview of It is a schematic front view.
FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG.
3 is a schematic sectional view taken along line III-III in FIG.
FIG. 4 is a view showing a pattern mask used when manufacturing the thin film solar cell module.
FIG. 5 shows a thin film solar cell module according to the present invention. one It is a schematic front view of an Example.
FIG. 6 is a schematic front view of another example of the thin-film solar cell module according to the present invention.
[Fig. 7] Another reference example Thin film solar cell module according to Overview of It is a schematic front view.
[Fig. 8] One reference example Thin film solar panel according to Overview of It is a schematic front view.
FIG. 9 shows a thin film solar cell panel according to the present invention. one It is a schematic front view of an Example.
FIG. 10 shows a thin film solar cell panel according to the present invention. Another It is a schematic front view of the Example of.
FIG. 11 is a schematic diagram for explaining a method of connecting thin film solar cell modules in one embodiment of the thin film solar cell panel according to the present invention.
FIG. 12 is a schematic cross-sectional view showing the structure of a thin film solar cell using a conventional technique.
[Explanation of symbols]
1: Transparent insulating substrate
2: Transparent conductive film
3: Photoelectric conversion layer
4: Back electrode layer
5: Adhesive material
6: Opaque back surface sealing material
7: Transparent conductive film separation line
8: Photoelectric conversion layer separation line
9: Back electrode layer separation line
10: Opening
11a: thin film solar cell
11: Laminate including thin film solar cell
12: Aluminum frame
13: Character part
14: Pattern mask
18-23, 31-33: Thin film solar cell module
26: Wiring

Claims (10)

A transparent electrode layer, a photoelectric conversion layer, and a back electrode layer are laminated in this order on a transparent insulating substrate, and at least the back electrode layer and the photoelectric conversion layer among the transparent electrode layer, the photoelectric conversion layer, and the back electrode layer. A thin film solar cell having a plurality of openings therethrough;
An opaque back surface sealing material provided on the opposite side of the light receiving surface of the thin film solar cell,
In the thin film solar cell module in which the opening exhibits a desired color when viewed from the light receiving surface side,
The plurality of openings include a plurality of linear openings with different straight line widths or different distances between the straight lines, and the linear openings display colors in gradation. Thin film solar cell module.   The thin film solar cell module according to claim 1, wherein the plurality of openings are combined to form a pattern.   The thin film solar cell module according to claim 1, wherein an area ratio of the opening to an effective light receiving area of the thin film solar cell is 50% or less.   The color exhibited by the opening is the color of the opaque backside sealing material, the color of the adhesive for bonding the backside sealing material to the backside electrode layer, or the color applied to the backside electrode layer and the opening. The thin film solar cell module according to claim 1, wherein the color is a colored resist film or a paint color.   2. The thin film solar cell module according to claim 1, further comprising means for irregularly reflecting light on a side opposite to the light receiving surface. In a thin film solar cell panel formed by arranging a plurality of thin film solar cell modules,
The thin film solar cell panel according to claim 1, wherein at least a part of the plurality of thin film solar cell modules is the thin film solar cell module according to claim 1.   The thin film solar cell according to claim 6, wherein a pattern is displayed on the front side by combining different thin film solar cell modules in an area ratio of the opening to the effective light receiving area of the thin film solar cell in a range of 0 to 50%. Battery panel.   Thin film solar cell modules having the same area ratio of the opening to the effective light receiving area of the thin film solar cell are connected in series, and thin film solar cell modules having different area ratios of the opening to the effective light receiving area of the thin film solar cell are connected in parallel. The thin film solar cell panel according to claim 7, wherein   The thin film solar cell panel according to any one of claims 6 to 8, wherein a pattern is displayed on the front side using thin film solar cell modules having different colors exhibited by the openings. In a thin film solar cell panel formed by arranging a plurality of thin film solar cell modules,
At least some of the plurality of thin film solar cell modules are each
A transparent electrode layer, a photoelectric conversion layer, and a back electrode layer are laminated in this order on a transparent insulating substrate, and at least the back electrode layer and the photoelectric conversion layer among the transparent electrode layer, the photoelectric conversion layer, and the back electrode layer. A thin film solar cell having a plurality of openings therethrough;
An opaque back surface sealing material provided on the opposite side of the light receiving surface of the thin film solar cell,
The opening has a desired color when viewed from the light-receiving surface side,
The at least some thin film solar cell modules have different area ratios of the opening to the effective light receiving area of the thin film solar cells, and these thin film solar cell modules display colors in gradation ,
The plurality of openings of each of the at least some of the thin film solar cell modules have a linear shape, and the thin film solar cell module has different widths or distances between the thin film solar cell modules . A thin film solar cell panel, wherein the ratio of the area of the opening to the effective light receiving area is different between the thin film solar cell modules .

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