Perovskite solar cell

Abstract

The utility model discloses a perovskite solar cell which comprises a bottom electrode layer, a light absorption transmission layer and a top electrode layer which are stacked. The first scribing groove divides the bottom electrode layer into a bottom electrode part and at least two bottom electrodes, and the second scribing groove divides the light absorption transmission layer into a light absorption transmission part and at least two light absorption transmission units; and the top electrode layer is divided into a top electrode part and at least two top electrodes by the third scribing groove. The top electrode part is positioned on the outer side of the top electrode of the sub-cell at the first end part, the light absorption transmission part is positioned on the outer side of the light absorption transmission unit of the sub-cell at the second end part, and the bottom electrode part is positioned on the outer side of the bottom electrode of the sub-cell at the second end part. According to the technical scheme of the utility model, the boundary of the first sub-cell and the sub-cell at the second end part which are connected in series can be conveniently positioned, the width of the first sub-cell and the effective width of the sub-cell at the second end part which are connected in series are ensured to be consistent with the effective width of other sub-cells, and the conversion efficiency of the perovskite solar cell is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field especially relates to a kind of perovskite solar cells. BACKGROUND

[0002] In recent years, perovskite solar cells have developed rapidly, and industrialization has been continuously advancing. In particular, the efficiency of large-area perovskite solar cell modules has been continuously improving.

[0003] A perovskite solar cell typically includes a substrate layer, a bottom electrode layer, an electron transport layer, a perovskite light-absorbing layer, a hole transport layer, and a top electrode layer stacked in order. The perovskite solar cell is provided with a first scribe groove, a second scribe groove, and a third scribe groove to divide the perovskite solar cell into a plurality of series-connected sub-cells. When an electrode lead is provided to the bottom electrode layer, the excess film layer at the boundary of the first end sub-cell and the second end sub-cell needs to be removed by a clean edge process to facilitate subsequent electrode connection and other operations.

[0004] However, the existing perovskite solar cell has the problem that the clean edge machine cannot accurately position the boundary of the first end sub-cell and the second end sub-cell when providing an electrode lead to the bottom electrode layer, resulting in inconsistent effective widths of the first sub-cell and the second end sub-cell with other sub-cells. SUMMARY

[0005] The utility model provides a kind of perovskite solar cell, it is convenient to position the boundary of the first end sub-cell and the second end sub-cell, ensure that the width of the first sub-cell and the width of the second end sub-cell are consistent with the effective width of other sub-cells, avoid the problems such as the decrease of output current, the reduction of fill factor, even the charge cannot be exported due to inconsistent width, so as to improve the conversion efficiency of perovskite solar cell.

[0006] The utility model discloses a perovskite solar cell, comprising: the bottom electrode layer, light absorption transmission layer and top electrode layer of laminated arrangement, perovskite solar cell still includes first scribe groove, second scribe groove and third scribe groove to divide perovskite solar cell into at least two series connection sub -cell, first scribe groove penetrates bottom electrode layer and separates bottom electrode layer into bottom electrode part and at least two bottom electrode, second scribe groove penetrates light absorption transmission layer and separates light absorption transmission layer into light absorption transmission part and at least two light absorption transmission unit, third scribe groove penetrates top electrode layer and separates top electrode layer into top electrode part and at least two top electrode, sub -cell includes bottom electrode, light absorption transmission unit and top electrode, top electrode part is located in the outside of the top electrode of the sub -cell of first end part, light absorption transmission part is located in the outside of the light absorption transmission unit of the sub -cell of second end part, and bottom electrode part is located in the outside of the bottom electrode of the sub -cell of second end part, the side of the bottom electrode of the sub -cell of first end part is provided with first electrode lead-out wire, and the side of bottom electrode part is provided with second electrode lead-out wire.

[0007] Optionally, the bottom electrode of the sub -cell of first end part includes first electrode lead-out part, and the first electrode lead-out part is free of the light absorption transmission layer and the top electrode layer thereon; the bottom electrode part includes second electrode lead-out part, and the second electrode lead-out part is free of the light absorption transmission layer and the top electrode layer thereon; the first electrode lead-out wire is arranged on the first electrode lead-out part, and the second electrode lead-out wire is arranged on the second electrode lead-out part.

[0008] Optionally, the vertical distance between the first electrode lead-out wire and the second electrode lead-out wire and the top electrode layer is 0.5-2 mm; and / or, a gap is arranged between the first electrode lead-out wire and the sub -cell of first end part, a gap is arranged between the second electrode lead-out wire and the sub -cell of second end part, a gap is arranged between the first electrode lead-out wire and the top electrode part, and a gap is arranged between the second electrode lead-out wire and the light absorption transmission part.

[0009] Optionally, the width of the top electrode part is less than the width of the top electrode; and / or, the width of the light absorption transmission part is less than the width of the light absorption transmission unit.

[0010] Optionally, the width of the top electrode part is 0.5-2 mm, and the outer side edge of the light absorption transmission unit of the sub -cell of first end part is aligned with the outer side edge of the top electrode part; and / or, the width of the light absorption transmission part is 0.5-2 mm, and the outer side edge of the top electrode of the sub -cell of second end part is aligned with the outer side edge of the light absorption transmission part.

[0011] Optionally, the light absorption transmission unit fills the first scribe groove; and / or, the top electrode fills the second scribe groove and is overlapped with the bottom electrode or the bottom electrode part.

[0012] Optionally, the sub -cells are arranged in a straight line along the same direction, and the third scribe groove, the first scribe groove and the second scribe groove corresponding to the same sub -cell are arranged in sequence along the sub -cell arrangement direction.

[0013] Optionally, the light-absorbing transport layer comprises an electron transport layer, a perovskite light-absorbing layer and a hole transport layer arranged in sequence, or the light-absorbing transport layer comprises a hole transport layer, a perovskite light-absorbing layer and an electron transport layer arranged in sequence.

[0014] Optionally, the perovskite solar cell further comprises a substrate, and the bottom electrode layer, the light-absorbing transport layer and the top electrode layer are arranged on one side of the substrate.

[0015] Optionally, the sub-cells at the first end and the sub-cells at the second end are the two outermost sub-cells of the perovskite solar cell.

[0016] The perovskite solar cell provided by the embodiment of the present application comprises a bottom electrode layer, a light-absorbing transport layer and a top electrode layer arranged in sequence. The first, second and third scribe grooves are arranged on the bottom electrode layer, the light-absorbing transport layer and the top electrode layer respectively, so that the cutting of the electrodes and the series connection of the positive and negative electrodes of adjacent sub-cells are realized, thereby obtaining a series-connected perovskite module. In addition, the third scribe groove arranged on the outer edge of the sub-cell at the first end and the first and second scribe grooves arranged on the outer edge of the sub-cell at the second end play a positioning role in the battery structure, so that the excess film layer can be accurately removed by the edge cleaning machine in the preparation process, the effective width of the sub-cell at the first end and the effective width of the sub-cell at the second end are ensured to be consistent with the effective width of other sub-cells, the problems of reduced output current, reduced fill factor or non-conduction of the circuit caused by inconsistent width are avoided, and the conversion efficiency of the perovskite solar cell is improved.

[0017] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0019] Figure 1 is a partial structure schematic diagram of a perovskite solar cell provided by the embodiment of the present application;

[0020] Figure 2 is a partial structure schematic diagram of another perovskite solar cell provided by the embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0022] It should be noted that the terms "first end portion", "second end portion" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0023] Figure 1 is a partial structure schematic diagram of a perovskite solar cell provided by an embodiment of the present application. As shown in the figure, Figure 1 The perovskite solar cell comprises a bottom electrode layer 1, a light absorption transmission layer 2 and a top electrode layer 3 which are stacked.

[0024] The perovskite solar cell further comprises a first scribing groove 4, a second scribing groove 5 and a third scribing groove 6 to divide the perovskite solar cell into at least two series-connected sub-cells 7.

[0025] The first scribing groove 4 penetrates through the bottom electrode layer 1 and separates the bottom electrode layer 1 into a bottom electrode portion 11 and at least two bottom electrodes 12, the second scribing groove 5 penetrates through the light absorption transmission layer 2 and separates the light absorption transmission layer 2 into a light absorption transmission portion 21 and at least two light absorption transmission units 22, and the third scribing groove 6 penetrates through the top electrode layer 3 and separates the top electrode layer 3 into a top electrode portion 31 and at least two top electrodes 32; the sub-cell 7 comprises the bottom electrode 12, the light absorption transmission unit 22 and the top electrode 32.

[0026] The top electrode portion 31 is located outside the top electrode 32 of the sub-cell 7 at the first end portion, the light absorption transmission portion 21 is located outside the light absorption transmission unit 22 of the sub-cell 7 at the second end portion, and the bottom electrode portion 11 is located outside the bottom electrode 12 of the sub-cell 7 at the second end portion. One side of the bottom electrode 12 of the sub-cell 7 at the first end portion is provided with a first electrode lead-out wire 8, and one side of the bottom electrode portion 11 is provided with a second electrode lead-out wire 9.

[0027] Specifically, the first end sub-cell 7 includes a first side and a second side, the first side is provided with the second sub-cell 7 in series, the second side is not provided with the second sub-cell 7 in series, and the top electrode part 31 is arranged on the second side of the first end sub-cell 7. The outer side of the light absorption transmission part 21 and the bottom electrode part 11 is the same, and will not be repeated here. It can be understood that the first end sub-cell 7 and the second end sub-cell 7 are the two outermost sub-cells 7 of the perovskite solar cell.

[0028] The material of the bottom electrode layer 1 is not specifically limited in the embodiment of the utility model, and only needs to have transparency and conductivity. A person skilled in the art can select a suitable material according to the need. Exemplarily, the material of the bottom electrode layer 1 can be at least one of indium tin oxide (ITO), doped tin dioxide (FTO), zinc oxide (ZnO), indium gallium zinc oxide (IGZO) and graphene and its derivatives.

[0029] The thickness of the bottom electrode layer 1 is not particularly limited in the embodiment of the utility model, and can be appropriately set according to the conductive material used. Exemplarily, the thickness of the bottom electrode layer 1 can range from 40 nm to 500 nm.

[0030] In some embodiments, the first scribe groove 4 is arranged through the bottom electrode layer 1, so as to divide the whole bottom electrode layer 1 into independent bottom electrodes 12, that is, to form a corresponding circuit pattern on the bottom electrode layer 1.

[0031] The light absorption transmission layer 2 can include an electron transmission layer, a perovskite light absorption layer and a hole transmission layer arranged in sequence. Alternatively, the light absorption transmission layer 2 can include a hole transmission layer, a perovskite light absorption layer and an electron transmission layer arranged in sequence. Optionally, the second scribe groove 5 is arranged through the light absorption transmission layer 2, so as to divide the large-area light absorption transmission layer 2 into a plurality of light absorption transmission units 22, and the bottom electrodes 12 and the top electrodes 32 between the sub-cells can be connected in series through the second scribe groove 5.

[0032] The material of the top electrode layer 3 is not particularly limited in the embodiments of the present application, and can be any material having conductivity. Exemplarily, the material of the top electrode layer 3 can be a metal material, including any one or a combination of at least two of Ag, Au, Al, Cr, Ni or Ti, and a typical but non-limiting combination includes a combination of Ag and Au, a combination of Al and Cr, a combination of Ni and Ti, a combination of Au, Ag and Al, a combination of Cr, Ni and Ti, a combination of Ag, Au, Al and Cr, a combination of Al, Cr, Ni and Ti, or a combination of Ag, Au, Al, Cr, Ni and Ti. In the above, Ag refers to silver, Au refers to gold, Al refers to aluminum, Cr refers to chromium, Ni refers to nickel, and Ti refers to titanium. Exemplarily, the material of the top electrode layer 3 can also include a conductive oxide, including but not limited to indium tungsten oxide (IWO), indium tin oxide (ITO), indium zinc oxide (IZO) and the like, and a combination of a conductive oxide material and a metal material.

[0033] The thickness of the top electrode layer 3 is not particularly limited in the embodiments of the present application, and can be appropriately set according to the conductive material used. Exemplarily, the thickness of the top electrode layer 3 is 10-400 nm, for example, can be 10 nm, 30 nm, 50 nm, 60 nm, 80 nm, 100 nm, 200 nm, 300 nm or 400 nm, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0034] In some embodiments, the width of the first scribe groove 4 is 10-100 μm, for example, can be 10 μm, 30 μm, 50 μm, 60 μm, 80 μm or 100 μm, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0035] In some embodiments, the width of the second scribe groove 5 is 15-400 μm, for example, can be 15 μm, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm or 400 μm, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0036] In some embodiments, the width of the third scribe groove 6 is 15-300 μm, for example, can be 15 μm, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm or 300 μm, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0037] The bottom electrode part 11 is part of the bottom electrode layer 1, located outside the bottom electrode 12 of the sub-cell at the second end. As part of the bottom electrode layer 1, the second electrode lead-out part 130 of the bottom electrode part 11 is directly connected to the second electrode lead-out wire 9, avoiding damage to the film layer and electrode lead wire caused by direct contact between the second electrode lead-out wire 9 and the top electrode layer 3. Thus, the stability of the perovskite solar cell structure can be enhanced, the output stability of the cell can be improved, and problems such as structural damage or poor lead wire contact during manufacturing, transportation, and use can be prevented.

[0038] The light absorption transmission part 21 is part of the light absorption transmission layer 2, located outside the light absorption transmission unit 22 of the sub-cell 7 at the second end. The light absorption transmission part 21, together with the first and second scribe grooves 4 and 5, determines the boundary of the sub-cell 7 at the second end, preventing the edge cleaner from positioning the boundary of the sub-cell 7 at the second end when the second electrode lead-out wire 9 is set to the bottom electrode layer 1, and thus preventing the effective film layer of the sub-cell 7 at the second end from being removed, resulting in inconsistent effective widths of the sub-cell 7 at the second end and other sub-cells 7, causing the circuit to fail to conduct. The light absorption transmission part 21 can also serve as a barrier to external environmental factors, protecting the structure and performance of the sub-cell.

[0039] The top electrode part 31 is part of the top electrode layer 3, located outside the top electrode 32 of the sub-cell at the first end. The top electrode part 31, together with the third scribe groove 6, determines the boundary of the sub-cell 7 at the first end, preventing the edge cleaner from positioning the boundary of the sub-cell 7 at the first end when the first electrode lead-out wire 8 is set to the bottom electrode layer 1, and thus preventing the effective film layer of the sub-cell 7 at the first end from being removed, resulting in inconsistent effective widths of the sub-cell 7 at the first end and other sub-cells 7. At the same time, the top electrode part 31 can also provide some protection for the sub-cell 7 at the first end, reducing the impact of external environmental factors and improving the stability of the perovskite solar cell.

[0040] For example, for a perovskite solar cell structure of Figure 1 , the setting of the first and second scribe grooves 4 and 5 and the light absorption transmission part 21 for the sub-cell at the second end can prevent the edge cleaner from removing the effective functional layer of the sub-cell 7 at the second end due to inaccurate positioning, thus affecting the series connection of the sub-cell 7 at the second end and the second electrode lead-out part 130, and avoiding circuit non-conduction. Similarly, the setting of the third scribe groove 6 and the top electrode part 31 can prevent the edge cleaner from positioning the boundary of the sub-cell at the first end, resulting in inconsistent effective widths of the sub-cell at the first end and other sub-cells, eliminating the problems of reduced output current due to narrow width or increased internal resistance and reduced fill factor due to wide width.

[0041] Based on the above embodiments, further referring to Figure 1Optionally, the width of the top electrode portion 31 is less than the width of the top electrode 32; and the width of the light absorption transmission portion 21 is less than the width of the light absorption transmission unit 22.

[0042] On the basis of the above-mentioned embodiments, with reference to Figure 1 Optionally, the first electrode lead-out wire 8 is located at one side of the top electrode 32 of the sub-cell away from the first end portion of the top electrode portion 31, and the second electrode lead-out wire 9 is located at one side of the light absorption transmission unit 22 of the sub-cell away from the second end portion of the light absorption transmission portion 21.

[0043] The perovskite solar cell provided by the embodiment of the utility model, including the bottom electrode layer, the light absorption transmission layer and the top electrode layer which are stacked, through setting the first scribe groove, the second scribe groove and the third scribe groove respectively in the bottom electrode layer, the light absorption transmission layer and the top electrode layer, the cutting of electrode and the series connection of adjacent sub-cell positive and negative poles are realized, so that the series connection perovskite module is obtained. Secondly, the third scribe groove set on the outer side edge of the sub-cell of the first end portion and the first scribe groove and the second scribe groove set on the outer side edge of the sub-cell of the second end portion play the positioning role in the battery structure, the excess film layer can be accurately removed by the edge cleaning machine in the preparation process, the effective width of the sub-cell of the first end portion and the effective width of the sub-cell of the second end portion are guaranteed to be consistent with the effective width of other sub-cells, the problems such as the decrease of output current, the decrease of filling factor or the non-conduction of circuit caused by the inconsistent width are avoided, and the conversion efficiency of the perovskite solar cell is improved.

[0044] On the basis of the above-mentioned embodiments, with reference to Figure 1 Optionally, the bottom electrode 12 of the sub-cell of the first end portion includes a first electrode lead-out portion 110, the first electrode lead-out portion 110 protrudes from the light absorption transmission unit 22 and the top electrode 32 of the sub-cell of the first end portion, and protrudes from the top electrode portion 31. The bottom electrode portion 11 includes a second electrode lead-out portion 120, the second electrode lead-out portion 130 protrudes from the light absorption transmission unit 22 and the top electrode 32 of the sub-cell of the second end portion, and protrudes from the light absorption transmission portion 21.

[0045] Optionally, the bottom electrode 12 of the sub-cell of the first end portion comprises a first electrode lead-out part 110, and no light-absorbing transmission layer and top electrode layer are arranged above the first electrode lead-out part 110. The bottom electrode part 11 comprises a second electrode lead-out part 120, and no light-absorbing transmission layer and top electrode layer are arranged above the second electrode lead-out part 120. The first electrode lead-out wire 8 is arranged on the first electrode lead-out part 110, and the second electrode lead-out wire 9 is arranged on the second electrode lead-out part 130. By arranging the first electrode lead-out part 110 and the second electrode lead-out part 130, a clear mounting position is provided for the first electrode lead-out wire 8 and the second electrode lead-out wire 9. This makes the connection of the electrode lead-out wire more convenient and accurate, and reduces the possibility of connection errors. In the manufacturing process, the electrode lead-out wire can be more easily positioned on the electrode lead-out part, improving production efficiency and product quality.

[0046] Specifically, the functions of the first electrode lead-out wire 8 and the second electrode lead-out wire 9 are to lead out the current generated by each sub-cell to an external circuit. The material of the first electrode lead-out wire 8 and the second electrode lead-out wire 9 is not specifically limited in the embodiment of the utility model, as long as it has electrical conductivity. For example, the material of the first electrode lead-out wire 8 and the second electrode lead-out wire 9 can be metal (such as copper, aluminum, etc.) or conductive polymer (such as polyacetylene, polyaniline, etc.).

[0047] In the embodiment of the utility model, the first electrode lead-out wire 8 and the second electrode lead-out wire 9 are both arranged on the bottom electrode layer 1. Since the bottom electrode layer 1 is generally very firm and stable, the electrode lead-out wire (including the first electrode lead-out wire 8 and the second electrode lead-out wire 9) is arranged on it, which can avoid contact with the top electrode layer 3 of the perovskite solar cell and thus avoid damage to the top electrode layer 3. At the same time, when the perovskite solar cell is encapsulated, since the electrode lead-out wire is away from the light-absorbing transmission layer 2, water and oxygen can be prevented from penetrating into the light-absorbing transmission layer 2 along the electrode lead-out wire, thereby improving the stability of the perovskite solar cell.

[0048] Based on the above embodiment, reference is continued to Figure 1 Optionally, the vertical distance between the first electrode lead-out wire 8 and the second electrode lead-out wire 9 and the top electrode layer 3 is 0.5-2 mm. And / or, a gap is arranged between the first electrode lead-out wire 8 and the sub-cell 7 of the first end portion, a gap is arranged between the second electrode lead-out wire 9 and the sub-cell of the second end portion 7, a gap is arranged between the first electrode lead-out wire 8 and the top electrode part 31, and a gap is arranged between the second electrode lead-out wire 9 and the light-absorbing transmission part 21. The appropriate vertical distance between the electrode lead-out wire and the top electrode layer 3 and the gap between the sub-cell and the electrode lead-out wire can reduce the risk of leakage and short circuit caused by mispositioning of the electrode lead-out wire, improve electrical safety and production yield; on the other hand, it can increase the packaging distance between the electrode lead-out wire and the effective functional layer, and improve the stability of the battery.

[0049] Further, the width of the top electrode part 31 is 0.5-2mm, and the outer edge of the light-absorbing transmission unit 22 of the sub-cell at the first end part is aligned with the outer edge of the top electrode part 31. And / or, the width of the light-absorbing transmission part 21 is 0.5-2mm, and the outer edge of the top electrode of the sub-cell at the second end part is aligned with the outer edge of the light-absorbing transmission part 21.

[0050] Table 1

[0051]

[0052] Table 1 shows the influence of the width d0 of the light-absorbing transmission part 21, the width d1 of the top electrode part 31, and the vertical distance d2 between the electrode lead-out line position and the top electrode layer 3 on the performance of the perovskite solar cell. Among them, Voc is the open-circuit voltage, Jsc is the short-circuit current, FF is the fill factor, and Eff is the photoelectric conversion efficiency. The above examples comprehensively consider the perovskite solar cell efficiency and the wet heat aging decay rate, and the performance is best when d0, d1 and d2 are within the limit range, and the photoelectric conversion efficiency or stability will decay when exceeding the limit range.

[0053] On the basis of the above examples, reference is continued to Figure 1 Optionally, the light-absorbing transmission unit 22 fills the first scribe groove 4. The top electrode 32 fills the second scribe groove 5 and is overlapped with the bottom electrode 12 or the bottom electrode part 11, which can ensure good electrical contact between the sub-cells. This continuous conductive path is conducive to the transmission of electric charge, reduces resistance, and improves the fill factor and efficiency of the cell.

[0054] On the basis of the above examples, reference is continued to Figure 1 Optionally, the sub-cells 7 are arranged in a straight line in the same direction, and the third scribe groove 6, the first scribe groove 4 and the second scribe groove 5 corresponding to the same sub-cell 7 are arranged in turn along the arrangement direction of the sub-cells 7. The straight-line arrangement of the sub-cells 7 makes the current path more definite, and the current flows through each sub-cell 7 in turn along the straight-line direction. This arrangement is simple in process and easy to produce, and facilitates quality inspection during production. When electrical problems such as short circuit or open circuit occur, it is easy to troubleshoot.

[0055] Figure 2 is another partial structure schematic diagram of a perovskite solar cell provided by the embodiments of the present application. As shown in Figure 2 Optionally, the perovskite solar cell further comprises a substrate 10, and the bottom electrode layer 1, the light-absorbing transmission layer 2 and the top electrode layer 3 are arranged on one side of the substrate 10.

[0056] Specifically, the substrate 10 can provide a buffering, protecting or supporting effect for the perovskite solar cell. Optionally, the substrate is a rigid substrate or a flexible substrate. For example, the substrate can be a flexible substrate, and the material of the flexible substrate can be polyimide (PI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET) or the like, or a mixed material of the above materials. The substrate 10 can also be a rigid substrate formed of a material such as glass.

[0057] The above detailed description does not constitute a limitation on the protection scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A perovskite solar cell, characterized by, The application relates to a perovskite solar cell. The perovskite solar cell comprises a bottom electrode layer, a light-absorbing transmission layer and a top electrode layer which are arranged in a stack. The perovskite solar cell further comprises a first scribe groove, a second scribe groove and a third scribe groove to divide the perovskite solar cell into at least two series-connected sub-cells. The first scribe groove penetrates the bottom electrode layer and separates the bottom electrode layer into a bottom electrode part and at least two bottom electrodes, the second scribe groove penetrates the light-absorbing transmission layer and separates the light-absorbing transmission layer into a light-absorbing transmission part and at least two light-absorbing transmission units, and the third scribe groove penetrates the top electrode layer and separates the top electrode layer into a top electrode part and at least two top electrodes. The top electrode part is located outside the top electrode of the sub-cell at a first end, the light-absorbing transmission part is located outside the light-absorbing transmission unit of the sub-cell at a second end, and the bottom electrode part is located outside the bottom electrode of the sub-cell at the second end. One side of the bottom electrode of the sub-cell at the first end is provided with a first electrode lead-out wire, and one side of the bottom electrode part is provided with a second electrode lead-out wire.

2. The perovskite solar cell according to claim 1, characterized in that, The bottom electrode of the sub-cell at the first end comprises a first electrode lead-out part, and the first electrode lead-out part is free of the light-absorbing transmission layer and the top electrode layer thereon; the bottom electrode part comprises a second electrode lead-out part, and the second electrode lead-out part is free of the light-absorbing transmission layer and the top electrode layer thereon. The first electrode lead-out wire is arranged on the first electrode lead-out part, and the second electrode lead-out wire is arranged on the second electrode lead-out part. 3.The perovskite solar cell of claim 1, wherein, The vertical distance between the first electrode lead-out wire, the second electrode lead-out wire and the top electrode layer is 0.5-2 mm. The first electrode lead-out wire and the sub-cell at the first end are provided with a gap, the second electrode lead-out wire and the sub-cell at the second end are provided with a gap, the first electrode lead-out wire and the top electrode part are provided with a gap, and the second electrode lead-out wire and the light-absorbing transmission part are provided with a gap. 4.The perovskite solar cell of claim 1, wherein, The width of the top electrode part is smaller than the width of the top electrode, and the width of the light-absorbing transmission part is smaller than the width of the light-absorbing transmission unit. 5.The perovskite solar cell of claim 1, wherein, The width of the top electrode part is 0.5-2 mm, and the outer side edge of the light-absorbing transmission unit of the sub-cell at the first end is aligned with the outer side edge of the top electrode part. The width of the light-absorbing transmission part is 0.5-2 mm, and the outer side edge of the top electrode of the sub-cell at the second end is aligned with the outer side edge of the light-absorbing transmission part. 6.The perovskite solar cell of claim 1, wherein, The light-absorbing transmission unit fills the first scribe groove, and the top electrode fills the second scribe groove and overlaps the bottom electrode or the bottom electrode part.

7. The perovskite solar cell according to claim 1, characterized in that, The sub-cells are arranged in a straight line in the same direction, and the third scribe groove, the first scribe groove and the second scribe groove corresponding to the same sub-cell are arranged in sequence along the arrangement direction of the sub-cells. 8.The perovskite solar cell of claim 1, wherein, The light-absorbing transport layer comprises an electron transport layer, a perovskite light-absorbing layer and a hole transport layer which are sequentially stacked, or the light-absorbing transport layer comprises the hole transport layer, the perovskite light-absorbing layer and the electron transport layer which are sequentially stacked. 9.The perovskite solar cell of claim 1, wherein, A substrate is further included, and the bottom electrode layer, the light-absorbing transport layer and the top electrode layer are arranged on one side of the substrate. 10.The perovskite solar cell of claim 1, wherein, The sub-cells at the first end and the sub-cells at the second end are the two outermost sub-cells of the perovskite solar cell.

Images