JP2008181688A - Solar cell device and building provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a solar cell device that can obtain transmitting light closer to natural light even if using a translucent solar cell transmitting visible light in a partial wavelength region. <P>SOLUTION: The solar cell device 10 is composed by vertically, horizontally, and alternately arraying two types of solar cell units 11 having different wavelength regions to be transmitted, that is, a short-wavelength transmission unit 13 and a long-wavelength transmission unit 14. Since each unit 13, 14 has the wavelength region to be transmitted that is different from each other, each visible light in a mutually different wavelength region mixedly exists in the visible light transmitting through the solar cell device 10. By this, a bias of the wavelength region in the transmitting light of the solar cell device 10 is reduced. As a result, it is possible to bring the transmitting light closer to natural light. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a solar cell device having translucency and a building including the solar cell device.

  In recent years, solar cells having translucency have been put into practical use. Conventionally, as such a translucent solar cell, a thin-film solar cell using a semiconductor thin film as a power generation element is known. In this thin film solar cell, light is transmitted by the following configuration, for example. One is a structure in which a slit is formed between a plurality of photoelectric conversion cells and light is transmitted through the slit (see Patent Document 1). The other is a configuration in which a gap is formed between solar cell individual segments in which a plurality of unit cells are integrated, and light is transmitted through the gap (see Patent Document 2). All of these have obtained translucency by leaking light from the gap formed between the power generation elements, and in order to improve the translucency performance (illumination degree), the occupied area of the gap must be increased. Don't be. However, if it does so, the occupation area of a power generation element will become small conversely, and electric power generation amount will fall. For this reason, in a thin film solar cell, there exists a problem that coexistence with translucency and power generation amount is difficult.

Thus, if the power generating element itself uses a light-transmitting solar battery, the above-described problems can be solved. Currently, dye-sensitized solar cells are being put into practical use as such solar cells. In this dye-sensitized solar cell, power generation is performed by utilizing a phenomenon that a sensitizing dye absorbs light such as sunlight or artificial light to be excited to emit electrons.
JP 2004-327901 A JP 2002-299666 A

  As described above, the problem of the thin-film solar cell can be solved by using a solar cell having a light transmitting property in the power generating element itself. However, in a solar cell that transmits a part of the wavelength region of incident visible light as in the case of using a dye-sensitized solar cell, the visible light transmitted through the solar cell is different from natural light. For this reason, there is a problem that an object irradiated with transmitted light has an unnatural color. In particular, when trying to use in a building such as a house, an object in the building has an unnatural color, which gives the user a feeling of strangeness. This problem is considered to be a major impediment to spreading the application of the solar cell to buildings.

  The present invention has been made in view of such problems, and even when a translucent solar cell that transmits a part of the wavelength region of incident visible light is used, transmitted light close to natural light is obtained. It is a main object to provide a solar cell device and a building including the solar cell device.

  Hereinafter, effective means for solving the above-described problems will be described while showing effects and the like as necessary.

  In the solar cell device of the present invention, a plurality of light transmission parts through which a part of the wavelength range of incident visible light is transmitted are arranged in parallel, and each of the light transmission parts is composed of a plurality of types having different wavelength ranges from each other. In addition, at least one of the light transmissive portions is constituted by a translucent solar cell.

  In this solar cell device, when visible light is incident on the light transmission part, a part of the wavelength region of the incident visible light is transmitted through the light transmission part. A plurality of light transmission parts are provided. Since each light transmissive part consists of a plurality of types having different wavelength regions to be transmitted, that is, having different light transmission characteristics, visible light in different wavelength regions is mixed in the transmitted light of the solar cell device. As a result, the transmitted light is less biased in the wavelength region in the visible light region, and as a result, the transmitted light can be made closer to natural light.

  If the different types of light transmitting parts are composed of a short wavelength transmitting part that transmits a short wavelength wavelength region and a long wavelength transmitting part that transmits a long wavelength wavelength region, A long wavelength region is mixed, and transmitted light can be made closer to natural light.

  In this case, it is preferable to set the wavelength region to be transmitted so that the wavelength region transmitted by the short wavelength transmission unit and the wavelength region transmitted by the long wavelength transmission unit overlap. Thereby, the incident visible light is transmitted over the entire visible light region, so that it can be made closer to natural light.

  If each of the light transmissive parts is constituted by the translucent solar cell, it is possible to secure a sufficient amount of power generation as a solar cell device including the translucent solar cell.

  At least any one of the light transmissive portions may be constituted by a filter portion. According to this configuration, although the amount of the translucent solar cell to be used is reduced, a relative decrease in the power generation amount is inevitable, but it is possible to provide a solar cell device that is inexpensive in terms of cost. Therefore, although installation of a light-transmitting solar cell device is required, it is suitable when it is desired to keep costs low.

  It is preferable that the whole including each light transmission part is configured as a flat unit. Thus, if a solar cell apparatus is formed in flat form, all the light transmissive parts will be provided with the incident surface facing the same direction, and the lighting property of a solar cell apparatus is improved. Further, the unitization of the solar cell device facilitates handling when the device is applied to buildings and other facilities.

  It is preferable that the light transmitting portions are arranged in a lattice shape and arranged so that adjacent light transmitting portions are of different types. By having such an arrangement configuration, visible light transmitted through adjacent light transmission portions becomes visible light in different wavelength regions. Thereby, the degree to which visible light in different wavelength regions is mixed is increased, and the transmitted light of the solar cell device can be made closer to natural light.

  It is preferable that a scattering means for scattering the transmitted visible light is provided on the emission side of each of the light transmission portions. By this scattering means, visible light that has passed through the light transmitting portion is scattered when it is emitted, so that the transmitted visible light is mixed immediately after emission. Thereby, the transmitted light can be brought close to natural light even at a position approaching the solar cell device.

  In the configuration in which the scattering means is provided as described above, the scattering means is preferably realized by an uneven shape. Thereby, in addition to the light scattering effect, the heat radiating effect can be obtained by increasing the surface area of the light transmitting portion. This effect is particularly remarkable when the light transmission part is formed of a translucent solar cell. This is because heat generated during power generation can be dissipated.

  The scattering means may be provided separately on the exit surface of the translucent solar cell, or the exit surface itself may have a scattering function. According to the latter, it is possible to maintain the same thickness as the configuration in which the scattering means is not provided.

  It is preferable that each of the light transmitting portions is configured as a unit having the same shape and the same dimensions. By combining unitized light transmitting portions as appropriate, a solar cell device having a free shape can be obtained, for example, a shape suitable for an application location. In addition, it is possible to appropriately change the arrangement configuration of the light transmitting portions. And if such an arrangement change is made, the mixing condition of visible light having different wavelength regions that have been transmitted through the respective light transmission parts is also changed, so that only the transmitted light of the solar cell device is brought close to natural light. Color rendering is also possible. Thereby, the desired transmitted light according to the application location is obtained. As mentioned above, according to this structure, the freedom degree of design of a solar cell apparatus can be raised.

  A submodule may be constituted by different types of light transmission parts, and a plurality of submodules may be assembled to constitute a solar cell device. By carrying out like this, the burden in the assembly | attachment operation | work of a solar cell apparatus can be reduced.

  The translucent solar cell is preferably a dye-sensitized solar cell. This is because the dye-sensitized solar cell has a remarkable effect of obtaining transmitted light close to natural light because the wavelength region of visible light transmitted differs depending on the sensitizing dye used.

  Each solar cell device configured as described above is suitable for use as part of a building facility. In this case, a part of the building equipment includes not only a place where sunlight hits but also a partition member in the building. For example, like a dye-sensitized solar cell, a translucent solar cell has a low rate of power generation reduction even with reflected light or scattered light that is not direct light, and the solar cell device is installed at a location where sunlight is directly applied It is not limited to.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a plan view of the solar cell device, and FIG. 2 is a cross-sectional view taken along line AA and BB in FIG. Since the cross-sectional structures of both the AA line and the BB line are the same, FIG. 2 is shown as a common cross-sectional view. Further, in FIG. 2, in order to make the illustration easy to understand, layers of a photo electrode 24 and a counter electrode 25 described later are illustrated as being thicker than actual.

  As shown in FIG. 1, the solar cell device 10 includes a plurality of solar cell units 11 and a main body frame 12 in which the solar cell units 11 are assembled in a lattice shape.

  Therefore, first, the solar cell unit 11 as a light transmitting portion will be described. In this embodiment, each solar cell unit 11 is a dye-sensitized solar cell. As shown in FIG. 2, each solar cell unit 11 has the same structure, the same shape, and the same dimension. Each solar cell unit 11 includes a pair of transparent substrates 21 and 22 and a sealing portion 23 interposed between the substrates 21 and 22.

  The pair of transparent substrates 21 and 22 are formed so as to form a square shape having the same size. In the present embodiment, transparent glass plates are used as the transparent substrates 21 and 22. On one transparent substrate (upper transparent substrate in FIG. 2) 21 of both transparent substrates, a photoelectrode (anode) 24 is formed on the surface opposite to the other transparent substrate 22. The side on which the photoelectrode 24 is formed is defined as the incident side. The photoelectrode 24 includes a transparent electrode formed on the transparent substrate 21 and a semiconductor electrode layer formed on the transparent substrate 21 (not shown). The semiconductor electrode layer is made of titanium oxide (TiO2) carrying a sensitizing dye.

  On the other transparent substrate (lower transparent substrate in FIG. 2) 22, a counter electrode (cathode) 25 is formed on a surface opposite to the incident-side transparent substrate 21. The side on which the counter electrode 25 is formed is defined as the emission side. The counter electrode 25 includes a transparent electrode formed on the transparent substrate 22 and a platinum layer formed on the transparent electrode (not shown).

  The sealing portion 23 is a frame body having a rectangular shape smaller than the transparent substrates 21 and 22 in plan view. The sealing portion 23 is sandwiched between the pair of transparent substrates 21 and 22 so that the inner peripheral space (the inner peripheral space of the frame) of the sealing portion 23 is sealed. An electrolyte 26 is sealed in the inner peripheral space of the sealing portion 23. Further, since the frame of the sealing portion 23 is formed smaller than the transparent substrates 21 and 22, as shown in FIG. 2, between the transparent substrates 21 and 22 and around the entire outer peripheral side of the sealing portion 23. A press-fit space 27 is formed.

The sensitizing dye is not particularly limited as long as it is excited by light in the visible light region and emits electrons. For example, metal complex dyes using various metals such as ruthenium (Ru), osmium (Os), iron (Fe), rhenium (Re), copper (Cu), platinum (Pt), methine dyes, mercurochrome dyes, xanthenes Organic dyes such as system dyes are appropriately used. As the electrolyte, an appropriate material such as a liquid electrolyte such as an electrolytic solution containing a redox couple (I ₃ ⁻ / 3I ⁻ ) of iodine, a polymer gel electrolyte, a solid electrolyte, or the like is used.

  Then, when sunlight or artificial light incident on the incident side of the solar cell unit 11 passes through the semiconductor electrode layer of the photoelectrode 24, the sensitizing dye absorbs a part of the wavelength in the visible light region and enters an excited state. Emits electrons. After these electrons are injected into the semiconductor electrode layer, they move to the counter electrode 25 through an electric circuit. The electrons that have moved to the counter electrode 25 are carried by holes or ions in the electrolyte 26 and return to the sensitizing dye in the semiconductor electrode layer. Such a process is repeated, and photoelectric conversion is performed in each solar cell unit 11.

  Here, in the present embodiment, the same number of two types of solar cell units 11 having different light transmission characteristics is used. Here, “different light transmission characteristics” means that the wavelength range of visible light absorbed by the sensitizing dye is different, and conversely, the wavelength range of visible light transmitted through the solar cell unit 11 is different. One has the property of transmitting light in the short wavelength region of the visible light region, and the other has the property of transmitting light in the long wavelength region. The transmitted wavelength region is set so that the short wavelength region and the long wavelength region overlap. This difference in properties is caused by the difference in the sensitizing dye used.

  The sensitizing dye to be used is not particularly limited as long as it has the above characteristics. In the following description, when the two types of solar cell units 11 are distinguished from each other, the solar cell unit 11 that transmits light in the short wavelength region is referred to as a “short wavelength transmission unit 13” as a short wavelength transmission unit. The solar cell unit 11 that transmits light in the wavelength region will be described separately from the “long wavelength transmission unit 14” as a long wavelength transmission unit. In FIG. 1, the difference in the light transmission characteristics is indicated by the difference in hatching interval. The shorter wavelength transmission unit 13 is the narrower one, and the long wavelength transmission unit 14 is the wider one.

  Next, the configuration of the main body frame 12 and what configuration the solar cell units 11 are assembled to the main body frame 12 will be described.

  The main body frame 12 is made of a light transmissive material. In this embodiment, a transparent acrylic resin is used. As shown in FIG. 1, the main body frame 12 includes an outer frame 31 having a rectangular frame shape, and a vertical beam 32 and a horizontal beam 33 provided inside the outer frame 31. The outer frame 31 is partitioned in a grid pattern. In the present embodiment, three vertical bars 32 and three horizontal bars 33 are provided, and a total of 16 opening portions 34 are formed. In the outer frame 31, the vertical beam 32, and the horizontal beam 33, a press-fit portion 35 is formed on an inner peripheral surface forming each opening portion 34 so as to protrude from the inner peripheral surface. Due to the press-fit portion 35, the outer frame 31 has a substantially T-shaped cross section, and the vertical bars 32 and 33 have a substantially cross-shaped cross section.

  Then, the press-fit portions 35 of the outer frame 31, the vertical beam 32, and the horizontal beam 33 are press-fitted into the press-fit spaces 27 formed in each solar cell unit 11, so that the solar cell unit 11 is inserted into each opening portion 34. Assembled.

  Although detailed illustration is omitted, the outer frame 31, the vertical beam 32, and the horizontal beam 33 are originally divided into a plurality of members, and the plurality of members are connected to each other while assembling each solar cell unit 11. Thus, the main body frame 12 is formed.

  In the present embodiment, eight short wavelength transmission units 13 and eight long wavelength transmission units 14 are prepared. The units 13 and 14 are arranged in a line in the vertical and horizontal directions, and are arranged alternately (in a lattice pattern) in the vertical and horizontal directions. If the adjacent units 13 and 14 are taken as a set and viewed as the hybrid unit portion 15, the solar cell device 10 is provided with a plurality (eight in this embodiment) of hybrid unit portions 15.

  As described above, the entire solar cell device 10 is configured as a flat unit. In addition, the transparent electrode of each solar cell unit 11 is electrically connected in the main body frame 12 (not shown), so that the current generated in each solar cell unit 11 is taken out of the solar cell device 10. It has become.

  Next, the effect | action of the solar cell apparatus 10 is demonstrated, referring FIG. FIG. 3 is a graph showing the light transmission characteristics, where the vertical axis indicates the light transmittance and the horizontal axis indicates the wavelength of the transmitted light.

  When sunlight or artificial light is inserted into the incident side of the solar cell device 10, the inserted light passes through the main body frame 12 as it is. On the other hand, in each solar cell unit 11, photoelectric exchange is performed using the inserted light. At this time, a part of the wavelength region of visible light is absorbed by the sensitizing dye, but visible light in the other region passes through the solar cell unit 11. As described above, since the two types of solar cell units 11 are used in this embodiment for the translucency characteristic that visible light in some wavelength regions is transmitted, each solar cell unit 11 has different characteristics. .

  FIG. 3A shows the light transmission characteristics of the short wavelength transmission unit 13. The short wavelength transmission unit 13 has a characteristic that there is an absorption peak of the sensitizing dye in the long wavelength region, and the wavelength of the long wavelength region in the visible light region is absorbed by the sensitizing dye. Thereby, the light transmitted through the short wavelength transmission unit 13 becomes a transmittance spectrum having a high transmittance T in the short wavelength region, and the transmitted light has a bluish color.

  FIG. 3B shows the light transmission characteristics of the long wavelength transmission unit 14. This long wavelength transmission unit 14 has a characteristic that there is an absorption peak of the sensitizing dye in the short wavelength region, and the wavelength in the short wavelength region of the visible light region is absorbed by the sensitizing dye. Thereby, the light transmitted through the long wavelength transmission unit 14 becomes a transmittance spectrum having a high transmittance T in the long wavelength region, and the transmitted light has a reddish color.

  And the light transmission characteristic of the hybrid unit part 15 which consists of these both units is shown in FIG.3 (c). In the hybrid unit section 15, the light transmission characteristics of the short wavelength transmission unit 13 and the long wavelength transmission unit 14 are combined. That is, the transmittance T3 of the entire hybrid unit portion 15 is ½ of the sum (T1 + T2) of the transmittance T1 of the short wavelength transmission unit 13 and the transmittance T2 of the long wavelength transmission unit 14 at a specific wavelength λ. . Thus, the visible light transmitted through the hybrid unit 15 is flattened without the transmittance spectrum being biased to either the short wavelength region or the long wavelength region, and the transmitted light is close to natural light.

  As described above in detail, the present embodiment has the following excellent effects.

  A plurality of solar cell units 11 having two kinds of light transmission characteristics, that is, a short wavelength transmission unit 13 and a long wavelength transmission unit 14 are arranged in parallel. When visible light enters each of the units 13 and 14, a part of the wavelength region of the incident visible light is transmitted. Since each unit 13 and 14 has a different wavelength range to be transmitted, visible light transmitted through the solar cell device 10 is mixed with visible light in different wavelength ranges. Thereby, the bias of the wavelength region of the visible light transmitted through the solar cell device 10 is relaxed, and as a result, the transmitted light can be brought close to natural light.

  The short wavelength transmission unit 13 and the long wavelength transmission unit 14 are arranged in a line in the vertical and horizontal directions, and are alternately arranged in the vertical and horizontal directions. For this reason, the visible light which permeate | transmitted the adjacent solar cell unit 11 turns into visible light of a mutually different wavelength range. Thereby, the degree to which the visible light of a different wavelength range mixes is raised, and the transmitted light of the solar cell apparatus 10 can be brought closer to natural light.

  Since the entire solar cell device 10 is configured as a flat unit, all the solar cell units 11 are provided with the transparent substrate 21 on the incident side facing the same direction. Sexuality is enhanced. Thereby, it can contribute to ensuring the electric power generation amount of the solar cell apparatus 10. Moreover, the unitization of the solar cell device 10 facilitates handling when the solar cell device 10 is applied to the building 51 and its peripheral equipment as will be described later.

  The embodiment described above may be modified as follows.

  (1) As the transparent substrates 21 and 22, in addition to the glass plate described above, a light-transmitting synthetic resin material such as an acrylic resin or a polycarbonate resin can also be used.

  (2) As the main body frame 12, in addition to the acrylic resin described above, a light-transmitting synthetic resin material such as polycarbonate resin, styrene resin, or epoxy resin, glass, or the like can be used. When a synthetic resin material is used, it may be reinforced with glass fiber. Further, in the case where both the transparent substrates 21 and 22 and the main body frame 12 are made of a synthetic resin material, the flexible solar cell device 10 can be obtained if the synthetic resin material is made flexible. The main body frame 12 is not necessarily required to have optical transparency.

  (3) The semiconductor electrode layer is not particularly limited as long as it is a metal oxide that functions as a semiconductor. In addition to the above-described titanium oxide, for example, zinc oxide (ZnO), tin oxide (SnO2), zirconium oxide (ZrO2) or the like may be used.

  (4) Light scattering means may be provided on the exit side of the solar cell device 10. Here, the characteristic of the said embodiment is that the light transmitted through the short-wavelength transmission unit 13 and the light transmitted through the long-wavelength transmission unit 14 are mixed and close to natural light in the hybrid unit section 15. The effect that the light is mixed in this way is easily obtained if it is far from the solar cell device 10, whereas it is difficult to obtain if it is close to the solar cell device 10. In this respect, by providing the light scattering means, the light transmitted through the units 13 and 14 is scattered and emitted, and is mixed immediately after the emission. For this reason, even if it approaches the solar cell apparatus 10, the transmitted light close | similar to natural light can be obtained.

  The light scattering means is not particularly limited as long as it can scatter transmitted light. For example, as shown in FIG. 4, the light scattering means is provided on the emission surface of the emission-side transparent substrate 22 (the surface on which the counter electrode 25 is not formed). It is conceivable to provide a scattering plate 41 having an uneven shape. Further, the emission surface of the transparent substrate 22 on the emission side may be formed to have an uneven shape. In addition, since such a concavo-convex shape increases the surface area, the effect of radiating heat generated in the battery unit including the electrodes 24 and 25 and the electrolyte 26 can be enhanced. Furthermore, it is good also as what has a light-scattering effect | action as a characteristic of transparent substrate 22 itself, without processing a shape and giving a scattering function.

  The above points are the same even when a synthetic resin material is used instead of a glass plate. Light may be scattered by processing the shape or dispersing resin particles in the resin layer. .

  (5) In the above embodiment, the solar cell unit 11 is used as the two types of light transmission parts having different wavelength regions to be transmitted. However, the same effect can be obtained by combining the solar cell unit 11 and the filter unit. It is done. That is, as shown in FIG. 5, the hybrid unit portion 43 is configured by using a filter portion 42 as a light transmission portion having the same light transmission characteristics as that of one solar cell unit 11. Certainly, the amount of power generation is relatively reduced by using the filter unit 42 having no power generation function. However, there is no change in that transmitted light close to natural light can be obtained, and the cost is reduced by reducing the number of solar cell units 11 in terms of cost. Therefore, although installation of the solar cell device 10 having translucency is required, it is suitable when it is desired to keep the cost low. FIG. 5 shows an example in which the hybrid unit unit 43 is configured by the long wavelength transmission unit 14 and the filter unit 42 having an absorption peak in the long wavelength region of visible light.

  (6) In the above embodiment, the hybrid unit portion 15 is configured using the solar cell unit 11 having two types of light transmission characteristics, but is hybridized using the solar cell unit 11 having more types of light transmission characteristics. You may comprise a unit part. By increasing the number of types in this way, it becomes possible to obtain transmitted light that is closer to natural light.

  (7) In the above embodiment, the solar cell device 10 is configured by assembling the individual solar cell units 11 to the main body frame 12, but one submodule is configured by the plurality of solar cell units 11. You may comprise the solar cell apparatus 10 by combining multiple. For example, it is conceivable to configure the hybrid unit sections 15 and 43 as submodules. By carrying out like this, the burden in the assembly | attachment operation | work of the solar cell apparatus 10 can be reduced.

  (8) Since each solar cell unit 11 has the same structure and is configured as a unit having the same shape and the same dimensions, the solar cell device 10 having a different shape by changing the number of the solar cell units 11 is used. It is good. Moreover, you may change the arrangement | sequence structure of each solar cell unit 11 suitably. If such a change is made, the mixing condition of visible light having different wavelength regions is also changed, so that the color rendering of transmitted light can be performed. Thereby, the desired transmitted light according to the application location is obtained.

  Next, an application example of the solar cell device 10 will be described with reference to FIG. FIG. 6 shows a schematic configuration of the building and its peripheral equipment.

(A) Application example to top light A top light 53 is provided on a part of the roof 52 of the building 51. The solar cell device 10 is used as the top light 53. In this case, the solar cell device 10 is attached so that the incident side is the outdoor side and the emission side is the indoor side.

  The top light 53 configured as described above is suitable for the installation environment of the solar cell device 10 because it is in an environment where sunlight is inserted. In the first place, the top light 53 is installed for the purpose of taking natural light from the sun indoors. For this reason, if the solar cell apparatus 10 of this embodiment which can make transmitted light close to natural light, it can be installed without impairing its purpose.

(B) Application Example to Glass Window A glass window 55 is provided on a part of the outer wall 54 of the building 51. The solar cell device 10 is used for the glass window 55. In this case, as partly enlarged and illustrated, the glass window 55 is composed of a pair of glass plates 56 and the solar cell device 10 held between the two glass plates 56. And the glass window 55 is attached so that the incident side of the solar cell apparatus 10 may become an outdoor side, and an output side may become an indoor side.

  The thus configured glass window 55 is also suitable for the installation environment of the solar cell device 10 because it is in an environment where sunlight is inserted. And since the transmitted light of the solar cell device 10 is close to natural light, unnaturalness when the transmitted light hits an object such as an indoor floor or furniture can be alleviated, and the uncomfortable feeling given to the user can be reduced. . For this reason, it can contribute to the spread of application of the dye-sensitized solar cell to the building 51.

  In addition, since the dye-sensitized solar cell is not limited to direct light, and the degree to which power generation efficiency decreases even with reflected light or scattered light, the installation location of the glass window 55 using the solar cell device 10 is not directly affected by sunlight. It is not limited to the environment to plug.

(C) Application example to partition member In the building 51, partition members 57 such as partition walls, doors, and shojis for partitioning rooms are provided. When the indoor window 58 is provided in the partition member 57, the solar cell device 10 is used for the indoor window 58. In this case, the solar cell device 10 is held between the pair of glass plates 56 in the same manner as the indoor window 58 is applied to the glass window 55. When applied to the indoor window 58, the incident side of the solar cell device 10 may be provided toward any room among the rooms partitioned by the partition member 57. This is because the dye-sensitized solar cell has a low rate of power generation reduction even with indirect light, and it is not essential to transmit direct light.

  Even in the indoor window 58 configured in this way, the transmitted light of the solar cell device 10 is close to natural light, so that unnaturalness when the transmitted light hits an object such as an indoor floor or furniture can be alleviated. .

(D) Application example to Balconi Balconi 59 is provided on the outer wall 54 of the upper floor portion of the building 51. The solar cell device 10 is used as the face material 60 of the balconi 59. Also in this case, the solar cell device 10 is held between the pair of glass plates 56 as in the application to the glass window 55. The solar cell device 10 is attached so that the incident side is the outside of the balcony 59 and the emission side is the inside of the balconi 59.

  Since the balconi 59 is often installed in an environment where sunlight is inserted, application to them is suitable for the installation environment of the solar cell device 10. And since the transmitted light is made close to natural light, the solar cell apparatus 10 can relieve the unnaturalness of the light transmitted to the inside of the balconi 59.

(E) Other application examples In addition to the application examples described above, the present invention can also be applied to glass curtain walls (book walls), roof tiles, floor tiles, glass louvers, and the like. Moreover, it is also possible to apply to peripheral equipment of the building 51 such as the roof 61a of the carport 61 provided outside the building 51 and the face material 62a of the outer groove fence 62. Further, it can be applied to a sunroof of a vehicle such as an automobile.

The top view of a solar cell apparatus. FIG. 2 is a cross-sectional view taken along line AA and BB in FIG. 1. It is the graph which showed the light transmission characteristic of the solar cell unit, (a) is the light transmission characteristic of a short wavelength transmission unit, (b) is the light transmission characteristic of a long wavelength transmission unit, (c) is the light transmission characteristic of a hybrid unit part. The characteristics are shown. Sectional drawing of the solar cell unit which provided the light-scattering board. The top view which showed a part of solar cell apparatus using a filter part. Schematic of the building and its surrounding facilities.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Solar cell apparatus, 11 ... Solar cell unit as a light transmission part, 12 ... Main body frame, 13 ... Short wavelength transmission unit as a short wavelength transmission part, 14 ... Long wavelength transmission unit as a long wavelength transmission part, 41 ... Scattering plate as scattering means, 42: filter section as light transmitting section, 51: building, 53: top light, 55: glass window, 58: indoor window, 57: partition member, 59a: balconi face material.

Claims (11)

A plurality of light transmission parts through which a part of the wavelength region of the incident visible light is transmitted are arranged in parallel,
Each of the light transmission parts is composed of a plurality of types having different wavelength regions to be transmitted,
A solar cell device, wherein at least one of the light transmissive portions is formed of a translucent solar cell.   The different types of light transmissive portions are composed of a short wavelength transmissive portion that transmits a short wavelength region and a long wavelength transmissive portion that transmits a long wavelength region. 1. The solar cell device according to 1.   3. The solar cell device according to claim 1, wherein each of the light transmissive portions is constituted by the translucent solar cell.   3. The solar cell device according to claim 1, wherein at least one of the light transmissive portions includes a filter portion.   5. The solar cell device according to claim 1, wherein the entirety including the light transmission parts is configured as a flat unit.   6. The solar cell device according to claim 1, wherein the light transmission parts are arranged in a lattice shape and are arranged so that adjacent light transmission parts are of different types.   7. The solar cell device according to claim 1, wherein scattering means for scattering the transmitted visible light is provided on an emission side of each of the light transmission portions.   The solar cell device according to any one of claims 1 to 7, wherein each of the light transmission portions is configured as a unit having the same shape and the same dimensions.   The solar cell device according to any one of claims 1 to 8, wherein a submodule is configured by different types of light transmitting portions, and a plurality of the submodules are assembled.   The solar cell device according to claim 1, wherein the translucent solar cell is a dye-sensitized solar cell.   The solar cell device according to any one of claims 1 to 10 is provided on a wall or roof that is exposed to natural light or artificial light so that light transmitted through the solar cell device reaches an indoor or a separate room. A building characterized by that.

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