A double-sided flexible perovskite solar cell module and its manufacturing method

Abstract

The present invention provides a double-sided flexible perovskite solar cell module and a manufacturing method thereof, comprising: 1) providing a transparent flexible substrate with a copper film, etching the copper film into a plurality of bottom electrode circuits of each unit by a roll-to-roll etching process, wherein the bottom electrode circuit of each unit includes an edge main grid line and an internal fine grid line; 2) forming a plurality of through holes, depositing a conductive material in the through holes to form a back electrode; 3) sequentially depositing a hole transport layer, a perovskite light absorption layer, an electron transport layer and a transparent oxide conductive layer; 4) printing a top electrode grid line; 5) cutting into a plurality of separated solar cell units; 6) bonding with a conductive adhesive to form a series perovskite solar cell module. The copper film and bottom electrode circuit process of the present invention is suitable for continuous production in a roll-to-roll manner, and then a flexible component is formed by cutting and stacking, so that the shape and size of the component can be designed by etching the circuit, and the component area shape design is highly flexible, and zero "dead zone" can be achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic cells, and in particular relates to a double-sided flexible perovskite solar cell assembly and a manufacturing method thereof. Background Art

[0002] At present, with the increasingly severe global ecological environment and energy shortage problems, solar photovoltaic power generation has received widespread attention from all countries. In recent years, a new battery technology called "perovskite solar cell" has attracted widespread attention from scientific researchers, and its battery conversion efficiency has increased rapidly in just a few years. Perovskite is a material with the same crystal structure as the mineral calcium titanium oxide (CaTiO3). Perovskite cells are new solar cells that use organic-inorganic composite perovskite materials as light-absorbing materials and cooperate with electron and hole transport. As the third-generation solar cell technology, perovskite cells have the advantages of high conversion efficiency, low production cost, good flexibility, clean and cheap, and have promising application prospects in photovoltaics, new energy, consumer electronics and other fields.

[0003] In the laboratory, the efficiency of small-area perovskite solar cells has reached 24.2%. It has commercial value. Perovskite is made by low-temperature process, and the thin film structure is suitable for large-area flexible components. At present, the perovskite process for large-area components on glass uses laser scribing similar to CIGS solar cells to form small units in series. However, when this solution is used for flexible devices, since there is only a micron-level disconnection between the top electrodes of the units, it is easy to form a short circuit when bending, and the stability of the perovskite film layer is poor, and it is difficult to use photoresist to achieve insulation between the top electrodes.

[0004] Therefore, providing a new double-sided flexible perovskite solar cell module and a method for manufacturing the same is a problem that needs to be solved by those skilled in the art. Summary of the invention

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a double-sided flexible perovskite solar cell module and a method for manufacturing the same, so as to solve the problems in the prior art that the shape of the single solar cell and the area of ​​the module are difficult to change according to the specific application occasions, and the top electrode is prone to short circuit.

[0006] To achieve the above-mentioned and other related purposes, the present invention provides a method for manufacturing a double-sided flexible perovskite solar cell module, the manufacturing method at least comprising:

[0007] 1) providing a transparent flexible substrate with a copper film on the surface, and etching the copper film to form bottom electrode circuits of multiple units through a roll-to-roll etching process, wherein the bottom electrode circuit of each unit includes an edge main grid line and an internal fine grid line electrically connected to the main grid line;

[0008] 2) forming a plurality of through holes in the transparent flexible substrate to expose the main grid lines, and depositing a conductive material in the through holes to form a back electrode;

[0009] 3) depositing a hole transport layer, a perovskite light absorption layer, an electron transport layer and a transparent oxide conductive layer covering the bottom electrode circuit on the surface of the transparent flexible substrate in sequence;

[0010] 4) printing a top electrode grid line on the surface of the transparent oxide conductive layer to form a full roll perovskite solar cell;

[0011] 5) cutting the whole roll of perovskite solar cells into a plurality of separate perovskite solar cell units according to the unit by die-cutting;

[0012] 6) Adhere the back electrode in each of the perovskite solar cell units to the top electrode grid line in the next adjacent perovskite solar cell unit using conductive adhesive, thereby forming a series-connected perovskite solar cell module.

[0013] Optionally, the transparent flexible substrate is a polyimide substrate or a polyethylene naphthalate substrate.

[0014] Optionally, the hole transport layer is one of PEDOT:PSS, Spiro-OMeTAD, TPD, PTAA, P3HT, and PCPDTBT, and is formed by coating or continuous evaporation.

[0015] Optionally, the perovskite light absorption layer has a thickness of 100 nm to 1000 nm and is an ABX3 structure compound, wherein A is CH3NH3 + 、NH2-CH=NH2 + 、C4H9NH3 + , Cs + , K + Or Na + One or a combination of, B is Pb 2+ Sn 2+ ,Ge 2+ , Mn 2+ , Cu 2+ One or a combination of, X is Cl - Br - ,I - One or a combination of the foregoing, wherein the perovskite light absorbing layer is formed by a slit coating method.

[0016] Optionally, the electron transport layer is a fullerene derivative or metal phthalocyanine, has a thickness of 100 to 500 nm, and is prepared by coating or continuous evaporation.

[0017] Optionally, the transparent oxide conductive layer is one of ITO, FTO, IWO, and IZO, and is formed by a continuous sputtering method.

[0018] Optionally, the top electrode grid line is formed by screen printing a low-temperature curing paste, and the low-temperature curing conductive paste is one of conductive silver paste, conductive copper paste, conductive nickel paste, conductive silver-coated copper paste, conductive silver-coated nickel paste, and conductive gold paste.

[0019] Optionally, in step 6), the perovskite solar cell units fixed by bonding form an overlapping structure, and the total overlapping area is less than 2% of the total area of ​​the perovskite solar cell assembly.

[0020] Optionally, the conductive adhesive is a solvent-free thermal curing conductive adhesive, and the resistivity after curing is less than 10 -3 Ωcm.

[0021] The present invention also provides a double-sided flexible perovskite solar cell module manufactured using any of the above-mentioned methods for manufacturing a double-sided flexible perovskite solar cell module.

[0022] As described above, the double-sided flexible perovskite solar cell assembly and the manufacturing method thereof of the present invention have the following beneficial effects:

[0023] 1) The present invention adopts a roll-to-roll coating process and an etching process to form a bottom electrode circuit on a substrate. The roll-to-roll technology can be produced continuously, greatly improving the production efficiency of the battery and reducing the production cost.

[0024] 2) The substrate of the present invention is a transparent flexible substrate, which can be cut and stacked to form a flexible component, eliminating the need for laser scribing and preventing top electrode short circuit. In addition, the shape and size of the single cell can be designed by etching the bottom electrode circuit, and the component can receive light on both sides. The area and shape have higher design flexibility, no dead zone, and are easy to cut, making it suitable for applications in various occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figures 1 to 9 The schematic diagram is a structural diagram showing the various steps of the method for making a double-sided flexible perovskite solar cell module of the present invention. Fig. 9 This is a schematic diagram of the double-sided flexible perovskite solar cell module of the present invention.

[0026] Fig.10 This is an overall schematic diagram of the double-sided flexible perovskite solar cell module of the present invention.

[0027] Component number description

[0028] 1 Copper film

[0029] 2 Transparent flexible substrate

[0030] 3 Bottom electrode circuit

[0031] 31 Busbar

[0032] 32 fine lines

[0033] 4 Through holes

[0034] 5 Back electrode

[0035] 6 Hole Transport Layer

[0036] 7 Perovskite light absorption layer

[0037] 8 Electron transport layer

[0038] 9 Transparent oxide conductive layer

[0039] 10 Top electrode grid line

[0040] 11 Conductive adhesive

[0041] 100 Perovskite Solar Cells DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0043] Please refer to the attached drawings. It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0044] like Figures 1 to 9 As shown, the present invention provides a method for manufacturing a double-sided flexible perovskite solar cell module, and the manufacturing method at least comprises the following steps:

[0045] First, execute step 1), such as Figure 1 As shown, a transparent flexible substrate 2 having a copper film 1 attached to the surface is provided, such as Figure 2 As shown, the copper film 1 is etched by a roll-to-roll etching process to form bottom electrode circuits 3 of multiple units, and the bottom electrode circuit 3 of each unit includes an edge main grid line 31 and an internal fine grid line 32 electrically connected to the main grid line 31 .

[0046] As an example, the transparent flexible substrate 2 is a polyimide substrate or a polyethylene naphthalate substrate. Of course, the transparent flexible substrate 2 can also be made of other suitable materials, which is not limited here.

[0047] The copper film 1 is formed on the transparent flexible substrate 2 by roll-to-roll coating, and the copper film 1 is etched by roll-to-roll etching. The roll-to-roll technology can achieve continuous production, greatly improve the production efficiency of the battery, and reduce the production cost.

[0048] The main grid lines 31 are located at the edge of each cell, and the fine grid lines 32 are located inside each cell. The main grid lines 31 and the fine grid lines 32 in the cell are electrically connected, and the bottom electrode lines 3 of adjacent cells are not electrically connected.

[0049] The position, shape and size of the main grid line 31 at the edge can define the area and shape of each solar cell unit, for example, it can be a square, a circle or relatively parallel lines. In this embodiment, the shape of the main grid line 31 is a group of relatively parallel lines, which is more convenient for subsequent cutting. The arrangement of the fine grid lines 32 is not limited, for example, it can be arranged in parallel, or arranged radially with the midpoint as the center, etc., which is not limited here. The fine grid lines 32 are used to collect photocurrent, and the collected photocurrent is collected to the main grid lines 31.

[0050] Then execute step 2), such as Figure 3 As shown, a plurality of through holes 4 exposing the main grid lines 31 are formed in the transparent flexible substrate 2. Figure 4 As shown, a conductive material is deposited in the through hole 4 to form a back electrode 5.

[0051] As an example, a laser may be used to punch holes in the transparent flexible substrate 2 to form a plurality of continuously distributed through holes 4, and the shapes of the through holes 4 are set according to specific requirements, including but not limited to circular, square, triangular, etc. The positions of the through holes 4 correspond to the positions of the main grid lines 31. The conductive material deposited in the through holes 4 forms an electrical connection with the main grid lines 31.

[0052] As an example, the conductive material includes but is not limited to a combination of one or more of silver, aluminum, gold, copper and nickel. In this embodiment, the conductive material is electroplated copper.

[0053] Then execute step 3), such as Figure 5 As shown, a hole transport layer 6 , a perovskite light absorption layer 7 , an electron transport layer 8 and a transparent oxide conductive layer 9 covering the bottom electrode circuit 3 are sequentially deposited on the surface of the transparent flexible substrate 2 .

[0054] As an example, the hole transport layer 6 is one of PEDOT:PSS, Spiro-OMeTAD, TPD, PTAA, P3HT, and PCPDTBT, and is formed by coating or continuous evaporation. In this embodiment, the hole transport layer 6 is PEDOT:PSS.

[0055] As an example, the perovskite light absorbing layer 7 has a thickness of 100 nm to 1000 nm and is an ABX3 structure compound, wherein A is CH3NH3 + 、NH2-CH=NH2 + 、C4H9NH3 + , Cs + , K + Or Na + One or a combination of, B is Pb 2+ Sn 2+ ,Ge 2+ , Mn 2 + , Cu 2+ One or a combination of, X is Cl - Br - ,I - One or a combination of the foregoing, wherein the perovskite light absorbing layer 7 is formed by a slit coating method. In this embodiment, the thickness of the perovskite light absorbing layer 7 is 500 nm, and the perovskite light absorbing layer is KSnCl3.

[0056] As an example, the electron transport layer 8 is a fullerene derivative or metal phthalocyanine, with a thickness of 100-500 nm, and is prepared by coating or continuous evaporation. In this embodiment, the thickness of the electron transport layer 8 is 300 nm.

[0057] As an example, the transparent oxide conductive layer 9 is one of ITO, FTO, IWO, and IZO, and is formed by a continuous sputtering method. In this embodiment, the transparent oxide conductive layer 9 is ITO.

[0058] Then execute step 4), such as Figure 6 As shown, a top electrode grid line 10 is printed on the surface of the transparent oxide conductive layer 9 to form a full roll perovskite solar cell.

[0059] As an example, the top electrode grid line 10 is formed by screen printing a low-temperature curing paste, and the low-temperature curing conductive paste is one of conductive silver paste, conductive copper paste, conductive nickel paste, conductive silver-coated copper paste, conductive silver-coated nickel paste, and conductive gold paste. In this embodiment, the low-temperature curing conductive paste is conductive silver paste.

[0060] Then execute step 5), such as Figure 7 and Figure 8 As shown, the whole roll of perovskite solar cells is cut into a plurality of separate perovskite solar cell units 100 by unit by die-cutting.

[0061] In this step, follow the Figure 7 The whole roll of perovskite solar cell can be cut into a plurality of separate perovskite solar cell units 100 by cutting the dotted line portion shown in FIG. Figure 8 .

[0062] Based on the flexible characteristics of the components, the present invention adopts a die-cutting method to cut the perovskite solar cell, which is simple and convenient to operate and suitable for large-scale production.

[0063] Finally, execute step 6), such as Fig. 9 As shown, the back electrode 5 in each perovskite solar cell unit 100 is bonded and fixed to the top electrode grid line 10 in the next adjacent perovskite solar cell unit 100 using a conductive adhesive 11, thereby forming the perovskite solar cell module connected in series.

[0064] The perovskite solar cell units 100 are stacked to form an overlapping structure. Under the premise of ensuring the bonding strength, the overlapping area of ​​the overlapping structure should be as small as possible to achieve no dead zone. As an example, in this step, the perovskite solar cell units 100 fixed by bonding form an overlapping structure, and the total overlapping area is less than 2% of the total area of ​​the perovskite solar cell module.

[0065] like Fig.10 It is a schematic diagram of the whole assembly, and it can be clearly seen that the perovskite solar cell assembly with an overlapping structure is formed by the perovskite solar cell units 100 connected in series.

[0066] As an example, the conductive adhesive 11 is a solvent-free thermal curing conductive adhesive, and the resistivity after curing is less than 10 -3 Ωcm.

[0067] This embodiment also provides a double-sided flexible perovskite solar cell module manufactured using any of the above-mentioned methods for manufacturing a double-sided flexible perovskite solar cell module.

[0068] In summary, the present invention provides a double-sided flexible perovskite solar cell module and a manufacturing method thereof, comprising: 1) providing a transparent flexible substrate with a copper film, etching the copper film into a plurality of bottom electrode circuits of each unit by a roll-to-roll etching process, wherein the bottom electrode circuit of each unit includes an edge main grid line and an internal fine grid line; 2) forming a plurality of through holes, depositing a conductive material in the through holes to form a back electrode; 3) sequentially depositing a transparent hole transport layer, a perovskite light absorption layer, an electron transport layer and a transparent oxide conductive layer; 4) printing a top electrode grid line; 5) cutting into a plurality of separated perovskite solar cell units; 6) bonding with a conductive adhesive to form a series-connected perovskite solar cell module. The present invention adopts a roll-to-roll coating process and an etching process to form a bottom electrode circuit on a substrate, and the roll-to-roll technology can be produced continuously, greatly improving the production efficiency of the battery and reducing the production cost. Since the substrate is a transparent flexible substrate, a flexible component can be formed by cutting and stacking. In addition, the shape and size of the single cell can be designed by etching the bottom electrode circuit. The component is illuminated on both sides, and the design flexibility of the area shape is higher, there is no dead area, and it is easy to cut, which is suitable for applications in various occasions.

[0069] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0070] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for manufacturing a double-sided flexible perovskite solar cell module, characterized in that: The production method at least comprises: 1) providing a transparent flexible substrate with a copper film on the surface, and etching the copper film to form bottom electrode circuits of multiple units through a roll-to-roll etching process, wherein the bottom electrode circuit of each unit includes an edge main grid line and an internal fine grid line electrically connected to the main grid line; 2) forming a plurality of through holes in the transparent flexible substrate to expose the main grid lines, and depositing a conductive material in the through holes to form a back electrode; 3) depositing a hole transport layer, a perovskite light absorption layer, an electron transport layer and a transparent oxide conductive layer covering the bottom electrode circuit on the surface of the transparent flexible substrate in sequence; 4) printing a top electrode grid line on the surface of the transparent oxide conductive layer to form a full roll perovskite solar cell; 5) cutting the whole roll of perovskite solar cells into a plurality of separate perovskite solar cell units according to the unit by die-cutting; 6) Adhere the back electrode in each of the perovskite solar cell units to the top electrode grid line in the next adjacent perovskite solar cell unit using conductive adhesive, thereby forming a series-connected perovskite solar cell module.

2. The method for manufacturing a double-sided flexible perovskite solar cell module according to claim 1, characterized in that: The transparent flexible substrate is a polyimide substrate or a polyethylene naphthalate substrate.

3. The method for manufacturing a double-sided flexible perovskite solar cell module according to claim 1, characterized in that: The hole transport layer is one of PEDOT:PSS, Spiro-OMeTAD, TPD, PTAA, P3HT, and PCPDTBT, and is formed by coating or continuous evaporation.

4. The method for manufacturing a double-sided flexible perovskite solar cell module according to claim 1, characterized in that: The perovskite light absorption layer has a thickness of 100 nm to 1000 nm and is an ABX3 structure compound, wherein A is CH3NH3 + 、NH2-CH=NH2 + 、C4H9NH3 + , Cs + , K + Or Na + One or a combination of, B is Pb 2+ Sn 2+ ,Ge 2+ , Mn 2+ , Cu 2+ One or a combination of, X is Cl - Br - ,I - One or a combination of the foregoing, wherein the perovskite light absorbing layer is formed by a slit coating method.

5. The method for manufacturing a double-sided flexible perovskite solar cell module according to claim 1, characterized in that: The electron transport layer is a fullerene derivative or metal phthalocyanine, has a thickness of 100 to 500 nm, and is prepared by coating or continuous evaporation.

6. The method for manufacturing a double-sided flexible perovskite solar cell module according to claim 1, characterized in that: The transparent oxide conductive layer is one of ITO, FTO, IWO and IZO, and is formed by a continuous sputtering method.

7. The method for manufacturing a double-sided flexible perovskite solar cell module according to claim 1, characterized in that: The top electrode grid line is formed by screen printing a low-temperature curing paste, and the low-temperature curing conductive paste is one of conductive silver paste, conductive copper paste, conductive nickel paste, conductive silver-coated copper paste, conductive silver-coated nickel paste, and conductive gold paste.

8. The method for manufacturing a double-sided flexible perovskite solar cell module according to claim 1, characterized in that: In step 6), the perovskite solar cell units fixed by bonding form an overlapping structure, and the total overlapping area is less than 2% of the total area of ​​the perovskite solar cell assembly.

9. The method for manufacturing a double-sided flexible perovskite solar cell module according to claim 1, characterized in that: The conductive adhesive is a solvent-free thermal curing conductive adhesive, and the resistivity after curing is less than 10 -3 Ωcm.

10. A double-sided flexible perovskite solar cell module manufactured by the method for manufacturing a double-sided flexible perovskite solar cell module according to any one of claims 1 to 9.

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