Perovskite solar cell to be installed on indoor side wall or ceiling, and installation method

Abstract

To provide a solar cell aiming at extending a life by a method different from changing a chemical composition or the like.SOLUTION: The solar battery includes a sealing part 12 for sealing a photoelectric conversion region 11, and a power generation part 11A provided in the photoelectric conversion region 11, and is installed with a light receiving surface facing the indoor side. For example, in the case of solar cells installed on ceilings, it is preferable that the solar cells have a weight such that the mass of the ceiling-surface-constituting members including the solar cells is equal to or less than 2kg / m2.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to perovskite solar cells that are installed on the side walls or ceilings of rooms, and to installation methods. [Background technology]

[0002] In recent years, perovskite solar cells have been attracting attention as a new solar cell that can replace existing silicon solar cells. In Patent Document 1, SnO is used as the electron transport layer. 2 and SnO 2 The electron transport layer contains a mixture of oxides other than the oxide, thereby achieving a longer life. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-130980 Summary of the Invention [Problem to be solved by the invention]

[0004] However, improving the life span by changing the chemical composition or the like requires a great deal of effort and time. Improving the lifespan is considered to be an issue facing solar cells, not just perovskite solar cells.

[0005] The present disclosure has been made in light of these circumstances, and one of its objectives is to provide a solar cell that aims to extend its lifespan using a method other than changing the chemical composition, etc. [Means for solving the problem]

[0006] The solar cell of the present disclosure is a solar cell installed on a side wall or ceiling inside a room, The solar cell is a sealing portion that seals the photoelectric conversion region; a power generation section provided in the photoelectric conversion region, The light receiving surface is placed facing the indoor side. [Effects of the Invention]

[0007] According to the present disclosure, a solar cell is provided that aims to extend its lifespan by a method other than changing the chemical composition or the like. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a back view of the back surface side, located opposite the light-receiving surface of the perovskite solar cell of the first embodiment according to the present disclosure, viewed from the front. [Figure 2] FIG. 1 is a front view of a light-receiving surface of a perovskite solar cell according to a first embodiment of the present disclosure. [Figure 3] FIG. 3 is a cross-sectional view of the perovskite solar cell taken along line AA in FIG. 2. [Figure 4] FIG. 1 is a diagram showing a state in which a perovskite solar cell is installed on an indoor ceiling in a first embodiment according to the present disclosure. [Figure 5] FIG. 2 is a diagram specifically illustrating a method (installation procedure) for installing a perovskite solar cell on an indoor ceiling according to the first embodiment of the present disclosure. [Figure 6] FIG. 10 is a diagram showing a state in which a perovskite solar cell according to a second embodiment of the present disclosure is installed on a side wall inside a room. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, modes for carrying out the invention (hereinafter referred to as "embodiments") will be described in detail with reference to the accompanying drawings. It should be noted that the same elements are denoted by the same numbers or symbols throughout the description of the embodiments.

[0010] However, not all numbers or symbols are assigned to all drawings, and in consideration of ease of viewing the drawings, numbers or symbols may be omitted in some drawings.

[0011] <<First Embodiment>> A solar cell to be installed on an indoor ceiling according to a first embodiment of the present disclosure and an installation method for installing the solar cell on an indoor ceiling will be described with reference to FIGS. 1 to 5. FIG.

[0012] In the following, a case where the solar cell is a perovskite solar cell 10 will be described. However, the solar cell does not have to be limited to a perovskite solar cell 10, and may be any solar cell provided with a power generation section 11A that is capable of generating power when installed indoors. For example, the solar cell may be a dye-sensitized solar cell in which the power generation section 11A includes a titanium oxide nanoparticle film coated with a dye and an electrolyte.

[0013] FIG. 1 is a back view of the back surface side, located opposite the light-receiving surface of a perovskite solar cell 10 according to a first embodiment of the present disclosure, viewed from the front. FIG. 2 is a front view of the light-receiving surface of the perovskite solar cell 10 of the first embodiment according to the present disclosure. FIG. 3 is a cross-sectional view of the perovskite solar cell 10 taken along line AA in FIG. 2, with the upper side of the figure being the light-receiving surface side and the lower side being the back surface side located opposite the light-receiving surface.

[0014] [Perovskite solar cells 10] As shown in Figure 1, the perovskite solar cell 10 comprises a photoelectric conversion region 11, a sealing portion 12 that seals the photoelectric conversion region 11, a power generation portion 11A having a perovskite layer 11A3 (see Figure 3) provided in the photoelectric conversion region 11, and an electrical wiring connection portion 13 provided on the back side of the sealing portion 12, which is opposite the light-receiving surface of the photoelectric conversion region 11.

[0015] (Photoelectric conversion area 11) As shown in FIG. 3, the photoelectric conversion region 11 is a region where a power generating section 11A having a perovskite layer 11A3 is disposed, thereby converting light into electricity.

[0016] In this embodiment, one power generation section 11A is arranged in the photoelectric conversion region 11, but there is no limit to the number of power generation sections 11A that can be arranged, and the number of power generation sections 11A to be arranged can be determined according to the size of the photoelectric conversion region 11 required for the perovskite solar cell 10.

[0017] "Power Generation Unit 11A" The power generation unit 11A includes a first electrode 11A1 (anode) provided on the back surface opposite the light-receiving surface, an electron transport layer 11A2 provided on the first electrode 11A1, a perovskite layer 11A3 serving as a photoelectric conversion layer provided on the electron transport layer 11A2, a hole transport layer 11A4 provided on the perovskite layer 11A3, a translucent second electrode 11A5 (cathode) provided on the hole transport layer 11A4, and a translucent base material 11A6 provided on the second electrode 11A5.

[0018] (1) First electrode 11A1: The first electrode 11A1 is an electrode for extracting electrons generated in the perovskite layer 11A3, and is connected to a wiring (not shown) for extracting a current. For example, the first electrode 11A1 can be made of an opaque metal material that functions as a general electrode, but a transparent electrode material may also be used.

[0019] (2) Electron transport layer 11A2: The electron transport layer 11A2 is a layer that allows electrons generated in the perovskite layer 11A3 to move to the first electrode 11A1, while preventing holes generated in the perovskite layer 11A3 from moving to the first electrode 11A1, and contains, for example, a halogen compound or a metal oxide.

[0020] (3) Perovskite layer 11A3: The perovskite layer 11A3 is a layer that absorbs light and performs photoelectric conversion, and contains a perovskite compound.

[0021] (4) Hole transport layer 11A4: The hole transport layer 11A4 is a layer that allows holes generated in the perovskite layer 11A3 to move to the second electrode 11A5, while preventing electrons generated in the perovskite layer 11A3 from moving to the second electrode 11A5, and can be made of, for example, a metal oxide.

[0022] (5) Second electrode 11A5: The second electrode 11A5 is an electrode that functions as a cathode, and is connected to a wiring (not shown). Second electrode 11A5 is made of a transparent electrode material such as indium tin oxide (ITO) or fluorine-doped tin oxide (FTO) in order to allow light from the light-receiving surface to pass through to perovskite layer 11A3.

[0023] (6) Base material 11A6: The substrate 11A6 is a starting material for forming the second electrode 11A5, the hole transport layer 11A4, the perovskite layer 11A3, the electron transport layer 11A2, and the first electrode 11A1, and is made of a translucent material to allow light from the light-receiving surface to pass through to the perovskite layer 11A3. For example, quartz glass, polyethylene terephthalate, etc. can be suitably used.

[0024] (Sealing portion 12) The sealing portion 12 comprises a back sheet 12A provided on the back surface opposite the light-receiving surface at a distance from the first electrode 11A1, a translucent barrier sheet 12B provided on the light-receiving surface side at a distance from the substrate 11A6, a translucent sealant 12C filled between the back sheet 12A and the barrier sheet 12B and the power generation portion 11A, and an outer edge material 12D provided along the entire outer edge so as to seal the gap at the outer peripheral edges of the back sheet 12A and the barrier sheet 12B. The above-described configuration of the sealing section 12 is merely an example, and the configuration is not limited to this, and it is sufficient if the configuration can appropriately protect the power generation section 11A from, for example, moisture.

[0025] In this embodiment, as will be described later, the perovskite solar cell 10 is used as a ceiling panel for a system ceiling.

[0026] On the other hand, since the perovskite solar cell 10 can be made thin enough to be bendable, the thickness of the back sheet 12A, for example, may be set to an appropriate thickness in order to obtain the strength required for installation as a ceiling panel.

[0027] The required strength varies depending on the size of the ceiling panel to be used, but for example, a back sheet 12A having a thickness that provides sufficient strength to prevent bending when installed in the target system ceiling may be used.

[0028] Furthermore, in order to obtain the required strength, rather than increasing the thickness of the backsheet 12A, the perovskite solar cell 10 may be provided on the backsheet 12A side and equipped with a plate for adjusting strength, and the plate may be fixed (for example, adhesively fixed) to the backsheet 12A side.

[0029] In addition, when a strength adjustment plate is provided as described above, the electrical wiring connection portion 13 may be provided on the strength adjustment plate, or an opening may be provided in the strength adjustment plate at a position corresponding to the electrical wiring connection portion 13 so that the electrical wiring connection portion 13 protrudes from the strength adjustment plate to the back side.

[0030] Furthermore, in the above-mentioned perovskite solar cell 10, the electrical wiring connection part 13 is provided on the sealing part 12 (back sheet 12A) on the back side, which is located opposite the light-receiving surface, so by installing the light-receiving surface facing the indoor side, the electrical wiring connection part 13 can be installed in the attic.

[0031] Therefore, firstly, there is no structure such as the electrical wiring connection part 13 on the indoor side of the ceiling, which improves the appearance.

[0032] Furthermore, an electrical cable is connected to the electrical wiring connection part 13 to conduct the electricity generated by the perovskite solar cell 10 from the electrical wiring connection part 13 to a relay box, power conditioner, etc. However, if the electrical wiring connection part 13 is located on the indoor side of the ceiling, not only is it time-consuming to install a cable rack to handle the electrical cable, but it also looks unsightly.

[0033] However, if the electrical wiring connection part 13 is located above the ceiling as in this embodiment, the electrical cable can be routed along the ceiling, which not only improves the appearance but also significantly reduces the effort required for wiring.

[0034] (Electrical wiring connection part 13) As described above, the electrical wiring connection part 13 is a connection part to which an electrical cable is connected for conducting the power generated by the perovskite solar cell 10 to a relay box, a power conditioner, or the like.

[0035] In this embodiment, the electrical wiring connection portion 13 has a lead wire (not shown) for connecting the electrical cable to the electrical cable, but the electrical wiring connection portion 13 may not have a lead wire and may instead have a terminal for directly connecting the tip of the electrical cable.

[0036] Incidentally, when used as a ceiling panel, it is preferable that it is lightweight in case it falls, and it is preferable that the perovskite solar cell 10 to be installed on a ceiling has a weight that does not fall under the category of a specific ceiling.

[0037] Specifically, since the perovskite solar cell 10 installed on the ceiling does not fall under the category of a specific ceiling, the mass of the ceiling components including the perovskite solar cell 10 is 2 kg / m 2 It is preferable that the weight is equal to or less than the above.

[0038] For example, a ceiling component including perovskite solar cells 10 includes, in addition to the perovskite solar cells 10, a main T-bar 22, a cross T-bar 23, etc., which will be described later.

[0039] Therefore, for example, the main T-bar 22, cross T-bar 23, etc., which will be described later, have a load of 1 kg / m 2 If there is a mass of 10 perovskite solar cells, the weight of 1 kg / m 2 If the mass of the ceiling component including the perovskite solar cell 10 is less than 2 kg / m 2 The weight will be as follows:

[0040] Furthermore, when used as a ceiling panel, taking into consideration the balance with the base material of the system ceiling, the outer dimensions (length and width) of the perovskite solar cell 10 are preferably 600 mm square, 640 mm square, 600 mm x 1200 mm, 750 mm x 1500 mm, etc.

[0041] Next, a method for installing the perovskite solar cell 10 on the ceiling of a room will be described. FIG. 4 is a diagram showing a state in which the perovskite solar cell 10 according to the first embodiment of the present disclosure is installed on the ceiling of an indoor room. FIG. 5 is a diagram specifically illustrating a method (installation procedure) for installing the perovskite solar cell 10 on an indoor ceiling according to the first embodiment of the present disclosure.

[0042] As shown in FIG. 4, perovskite solar cells 10 used as ceiling panels are installed on the ceiling of a room, for example, alternately with ordinary ceiling panels. This creates a contrast on the ceiling, making for a more attractive installation.

[0043] In recent years, some people prefer chic black ceiling colors, and the entire ceiling panel may be made of perovskite solar cells 10.

[0044] When the perovskite solar cell 10 is installed with its light-receiving surface facing indoors, it receives light from windows and lights and generates electricity.

[0045] For example, silicon-based solar cells have difficulty generating electricity in such weak light, but perovskite solar cell 10 has the characteristic of being able to generate electricity even in weak light such as 1000 lux or 200 lux, so it can generate electricity even when installed on the ceiling.

[0046] The perovskite solar cell 10 can generate electricity even under weak light such as that described above, which means that it can generate electricity even under low illuminance such as indoor LED lighting. Therefore, even at night, power is generated while the lights are on, and although the amount of power generated is naturally less than that used to turn on the lights, some of the power used to turn on the lights can be recovered, which contributes to energy conservation.

[0047] Furthermore, perovskite solar cells 10 are subject to deterioration and a shortened lifespan due to exposure to ultraviolet rays, heat, and humidity, but as described above, installing them indoors can significantly reduce such effects, thereby extending their lifespan.

[0048] In other words, because indoors is not as harsh an environment as outdoors, it is possible to significantly reduce the deterioration of solar cells, and even solar cells other than perovskite solar cell 10 are expected to have a longer lifespan.

[0049] Next, a method (installation procedure) for installing the perovskite solar cell 10 on the indoor ceiling will be specifically described. In this embodiment, the ceiling is a grid-type system ceiling, but it may also be a line-type system ceiling.

[0050] The installation method for installing perovskite solar cells 10 on an indoor ceiling includes a base material installation step of installing base material 20 for the system ceiling shown in Figure 5, a solar cell installation step of installing perovskite solar cells 10 on base material 20 of the installed system ceiling, and a connection step of connecting an electrical cable (not shown) to the electrical wiring connection portion 13 of perovskite solar cells 10.

[0051] (Base material installation step) The base material installation step includes a base fixing step in which the base of the hanging bolt 21 is fixed to the ceiling, and a frame formation step in which a T-bar or the like (main T-bar 22, cross T-bar 23, etc.) is attached to the tip of the hanging bolt 21 to form a frame for installing the ceiling panel.

[0052] 5, detailed connection structures for connecting the tips of the hanging bolts 21 to the T-bars and the like (main T-bars 22, cross T-bars 23, etc.) are omitted from the illustration. Furthermore, in FIG. 5, detailed connection structures for connecting T-bars (main T-bar 22, cross T-bar 23, etc.) are not shown. However, details such as the connection structure, which are omitted in FIG. 5, do not need to be special and may be the same as commercially available base materials.

[0053] After the base material 20 is installed in this manner, the solar cell installation step is carried out. It is also possible to replace the ceiling panels of an existing system ceiling with the perovskite solar cell 10 of this embodiment, in which case the base material 20 has already been installed, so the base material installation step may be omitted.

[0054] (Solar cell installation steps) In the case of a grid-type system ceiling, the structure requires only placing a ceiling panel on the frame body, so the solar cell installation step is to install the perovskite solar cell 10 by fitting it into the frame body of the base material 20, as shown by the arrow in Figure 5.

[0055] (Connection step) Once the installation of the perovskite solar cells 10 is complete, a connection step is carried out in which electrical cables (not shown) are connected to the electrical wiring connection parts 13 of each perovskite solar cell 10, and the installation is then completed.

[0056] The connection step may be performed before the perovskite solar cell 10 is installed by fitting it into the frame of the base material 20, or may be performed each time one perovskite solar cell 10 is installed by fitting it into the frame of the base material 20.

[0057] As can be understood from the above explanation of the installation method, if the perovskite solar cell 10 deteriorates after installation, only the deteriorated part of the perovskite solar cell 10 needs to be replaced, and the replacement work is also extremely simple, as it only requires removing the perovskite solar cell 10 which is fitted as a ceiling panel.

[0058] As explained above, in the method of installing the perovskite solar cell 10 on the indoor ceiling, the mass of the ceiling surface components including the perovskite solar cell 10 is 2 kg / m 2 It is preferable to use items that weigh less than this, so that they do not fall under the specified ceiling.

[0059] <<Second embodiment>> Next, a solar cell to be installed on an indoor side wall and an installation method for installing the solar cell on an indoor side wall according to a second embodiment of the present disclosure will be described with reference to FIG. In the second embodiment, as in the first embodiment, the solar cell is a perovskite solar cell 10.

[0060] However, similar to the first embodiment, the solar cell is not limited to the perovskite solar cell 10, and may be any solar cell provided with a power generation section 11A that is capable of generating power when installed indoors.

[0061] FIG. 6 is a diagram showing a state in which a perovskite solar cell 10 according to a second embodiment of the present disclosure is installed on a side wall inside a room.

[0062] In addition, since Figure 6 shows the perovskite solar cell 10 installed with its light-receiving surface facing indoors, the electrical wiring connection part 13 provided on the back side opposite the light-receiving surface is not shown.

[0063] In the second embodiment, the configuration of the perovskite solar cell 10 itself may be the same as in the first embodiment, with only the installation aspect being the main difference. Therefore, the following description will mainly focus on the installation aspect, and explanations of parts that are the same as in the first embodiment may be omitted.

[0064] As shown in Figure 6, when installing a perovskite solar cell 10 on a side wall inside a room, it is preferable to install it on a partition wall commonly found in conference rooms, for example, so that the light-receiving surface of the perovskite solar cell 10 faces inside the room.

[0065] For example, an opening for installing the perovskite solar cell 10 is provided in the partition wall, and the perovskite solar cell 10 is fitted and fixed to both sides of the partition wall so that the electrical wiring connection part 13 (not shown) is located inside the partition wall. That is, the light receiving surface is set facing the indoor side, so that the electrical wiring connection part 13 is set inside the side wall.

[0066] For fixing purposes, a through hole for passing a bolt may be provided in the sealing portion 12 outside the photoelectric conversion region 11, and a nut for threading the bolt may be fixed to the partition wall side.

[0067] Conversely, a male thread structure may be provided on the partition wall side, and the male thread structure may be passed through a through hole and a nut may be screwed onto the part of the male thread structure that protrudes inside the room.

[0068] The ceiling side of the partition wall is left open, and the electrical cable wired above the ceiling is pulled inward through the opening on the ceiling side of the partition wall and connected to the electrical wiring connection part 13 (not shown) on the inside of the partition wall.

[0069] Specifically, the installation can be carried out in the following order: first, an electrical cable is connected to the electrical wiring connection part 13 (not shown), and then the perovskite solar cell 10 is fixed to the partition wall.

[0070] Even in this aspect of the second embodiment, the perovskite solar cell 10 is installed indoors, so the perovskite solar cell 10 is less susceptible to the effects of ultraviolet light, heat, moisture, and the like, and has a longer lifespan.

[0071] Furthermore, in the example shown in Figure 6, the room has no windows, so the effect of installing perovskite solar cell 10 is mainly energy savings. However, if the solar cell is installed in a room with some windows, electricity generated using sunlight as energy will also be added, resulting in a positive energy balance during the day when lights are not in use.

[0072] Although the present disclosure has been described above based on specific embodiments, it should be understood that the present disclosure is not limited to the above embodiments.

[0073] For example, a partition wall has been shown as a specific example of a side wall inside a room on which the perovskite solar cell 10 is installed, but the side wall inside the room on which the perovskite solar cell 10 is installed does not need to be limited to a partition wall.

[0074] The sidewall is not limited to a removable sidewall such as a partition wall, but may be any sidewall that can form an inset portion into which the perovskite solar cell 10 can be installed.

[0075] The perovskite solar cell 10 may also be mounted on a partition that can be used to place at the end of a room to act as a movable room wall.

[0076] Specifically, a hole may be drilled on the rear surface of the partition to allow access to the electrical wiring connection portion 13, and the perovskite solar cell 10 may be provided on the front surface of the partition.

[0077] The front surface of the partition can then be placed facing the indoor side, with the light-receiving surface of the perovskite solar cell 10 facing the indoor side.

[0078] As such, the present disclosure also encompasses modifications and improvements to the embodiments within its technical scope, which will be apparent to those skilled in the art from the claims. [Explanation of symbols]

[0079] 10 Perovskite solar cell, 11 Photoelectric conversion region, 11A Power generation section, 11A1 First electrode, 11A2 Electron transport layer, 11A3 Perovskite layer, 11A4 Hole transport layer, 11A5 Second electrode, 11A6 Substrate, 12 Sealing section, 12A Back sheet, 12B Barrier sheet, 12C Sealant, 12D Outer edge material, 13 Electrical wiring connection section, 20 Base material, 21 Hanging bolt, 22 Main T-bar, 23 Cross T-bar

Claims

1. A solar cell installed on a side wall or ceiling inside a room, The solar cell is a sealing portion that seals the photoelectric conversion region; a power generation section provided in the photoelectric conversion region, A solar cell that is installed with the light-receiving surface facing the indoor side.

2. The solar cell installed on the ceiling, The solar cell is configured such that the mass of the ceiling surface component including the solar cell is 2 kg / m ２ 10. The solar cell of claim 1, having a weight of:

3. An installation method for installing solar cells on a ceiling in a room, comprising: a solar cell installation step of installing the solar cell on a base material of an installed system ceiling; The solar cell is a sealing portion that seals the photoelectric conversion region; a power generation section provided in the photoelectric conversion region, In the installation step, the light receiving surface is installed facing the indoor side.

4. The mass of the ceiling surface component including the solar cell is 2 kg / m ２ The installation method according to claim 3, wherein an object having a weight of not more than 1000 kg is used.

5. The installation method according to claim 3 or 4, wherein the system ceiling is a grid-type system ceiling.

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