Laminated cell and preparation method thereof

Abstract

The embodiment of the invention provides a laminated cell and a preparation method of the laminated cell, the laminated cell comprises a top cell unit, a bottom cell unit and a composite layer located between the top cell unit and the bottom cell unit, the composite layer has a first surface facing the top cell unit along the thickness direction of the laminated cell, and the first surface is provided with a second surface facing the bottom cell unit. A first passivation isolation layer is arranged on the first surface, and the surface area of the first passivation isolation layer is smaller than that of the first surface. By arranging the first passivation isolation layer on the first surface, the separation effect on the perovskite layer and the composite layer can be improved, the phenomenon of contact between the perovskite layer and the composite layer is reduced, and the possibility of electric leakage of the laminated cell is remarkably reduced, so that the working performance of the laminated cell is ensured. And the surface area of the first passivation isolation layer is smaller than that of the first surface, so that carriers can circulate between the hole transport layer and the composite layer, and normal use of the laminated cell is ensured.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic cells, and in particular to a laminated cell and a method for preparing the laminated cell. Background Art

[0002] The stacked battery is generally composed of three parts stacked in sequence: a top battery unit with a wide bandgap, a composite layer, and a bottom battery with a narrow bandgap. The top battery unit includes a perovskite layer and a hole transport layer arranged in sequence. The hole transport layer is in contact with the composite layer, and can also play a role in separating the perovskite layer and the composite layer to avoid contact between the perovskite layer and the composite layer. However, in actual use, the hole transport layer cannot completely separate the perovskite layer and the composite layer, which easily causes the perovskite layer to contact the composite layer, resulting in leakage, which greatly reduces the performance of the stacked battery. Summary of the invention

[0003] In view of this, the present application provides a stacked battery and a method for preparing the stacked battery, so as to solve the technical problem in the prior art that the perovskite layer in the stacked battery is easy to contact with the composite layer, resulting in leakage of the stacked battery.

[0004] In a first aspect, the present application provides a stacked battery, comprising a top battery cell, a bottom battery cell, and a composite layer located between the top battery cell and the bottom battery cell; along the thickness direction of the stacked battery, the composite layer has a first surface facing the top battery cell, and a first passivation isolation layer is arranged on the first surface; the surface area of ​​the first passivation isolation layer is smaller than the surface area of ​​the first surface.

[0005] In this embodiment, by providing the first passivation isolation layer on the first surface, the separation effect of the perovskite layer and the composite layer can be improved, the contact between the perovskite layer and the composite layer can be reduced, and the possibility of leakage of the laminated battery can be significantly reduced, thereby ensuring the working performance of the laminated battery. And the surface area of ​​the first passivation isolation layer is smaller than the surface area of ​​the first surface, so that the first passivation isolation layer does not completely cover the first surface, thereby preventing the first passivation isolation layer from completely separating the hole transport layer and the composite layer, so that carriers can flow between the hole transport layer and the composite layer, ensuring that the laminated battery can be used normally.

[0006] In a specific embodiment, the first passivation isolation layer includes a plurality of isolation portions disposed at intervals.

[0007] In a specific embodiment, the top battery unit includes a stacked perovskite layer and a hole transport layer, and the isolation portion includes a combination of any one or more of a first isolation portion, a second isolation portion and a third isolation portion, wherein the thickness of the first isolation portion is less than the thickness of the hole transport layer, the thickness of the second isolation portion is equal to the thickness of the hole transport layer, and the thickness of the third isolation portion is greater than the thickness of the hole transport layer; the second isolation portion and the third isolation portion are in contact with the perovskite layer.

[0008] In a specific embodiment, the bottom battery unit includes an amorphous silicon layer connected to the composite layer, the amorphous silicon layer has a second surface facing the composite layer, and the second surface is provided with a second passivation isolation layer; the surface area of ​​the second passivation isolation layer is smaller than the surface area of ​​the second surface, and the thickness of the second passivation isolation layer is smaller than the thickness of the composite layer.

[0009] In a specific embodiment, the thickness of the first passivation isolation layer is 0.1 nm-200 nm, and / or the thickness of the second passivation isolation layer is 0.1 nm-30 nm.

[0010] In a specific embodiment, the first passivation isolation layer and the second passivation isolation layer include at least one of a metal oxide and a non-metal oxide.

[0011] In a specific embodiment, the ratio of the surface area of ​​the first passivation isolation layer to the surface area of ​​the first surface is 0.01-0.8, and / or the ratio of the surface area of ​​the second passivation isolation layer to the surface area of ​​the second surface is 0.01-0.8.

[0012] In a second aspect, the present application provides a method for preparing a stacked battery, the method for preparing the stacked battery comprising:

[0013] preparing a bottom battery cell;

[0014] preparing a composite layer on top of the bottom battery cell;

[0015] Prepare a first passivation isolation layer on the first surface of the composite layer, and make the surface area of ​​the first passivation isolation layer smaller than the surface area of ​​the first surface;

[0016] A top battery cell is fabricated on the composite layer and the first passivation isolation layer.

[0017] In a specific embodiment, after preparing the bottom battery unit and before preparing the composite layer, the method for preparing the stacked battery includes:

[0018] Preparing a second passivation isolation layer on the second surface of the bottom battery unit, wherein the surface area of ​​the second passivation isolation layer is smaller than the surface area of ​​the second surface;

[0019] When preparing the composite layer, the method for preparing the laminated battery specifically includes:

[0020] The composite layer is prepared on the second surface and the second passivation isolation layer, so that the composite layer covers the second passivation isolation layer.

[0021] In a specific embodiment, when the first passivation isolation layer is prepared on the first surface of the composite layer, the method for preparing the stacked battery specifically includes:

[0022] Spin coating an oxide solution on the first surface of the composite layer to obtain the first passivation isolation layer;

[0023] When preparing the second passivation isolation layer on the second surface of the bottom battery unit, the preparation method of the stacked battery specifically includes:

[0024] Spin coating an oxide solution on a second surface of the bottom battery unit to obtain the second passivation isolation layer;

[0025] The particle size of the oxide solution is 10 nm-200 nm, the spin coating speed is 2000 rpm-8000 rpm, and the solubility of the oxide solution is 0.2 wt%-20 wt%.

[0026] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 It is a schematic diagram of the structure of a stacked battery;

[0029] Figure 2 A schematic diagram of the structure of a stacked battery provided in this application in a specific embodiment;

[0030] Figure 3 A schematic diagram of the structure of the laminated battery provided in the present application in another specific embodiment;

[0031] Figure 4This is a schematic structural diagram of a stacked battery provided in the present application in yet another specific embodiment.

[0032] Reference numerals:

[0033] 1- Laminated battery;

[0034] 11- top battery unit;

[0035] 111-hole transport layer;

[0036] 112-perovskite layer;

[0037] 113-electron transport layer;

[0038] 114- buffer layer;

[0039] 115-transparent conductive oxide layer;

[0040] 12- bottom battery cell;

[0041] 121- single crystal silicon layer;

[0042] 122-amorphous silicon layer;

[0043] 123-intrinsic amorphous silicon layer;

[0044] 124- second surface;

[0045] 13-composite layer;

[0046] 131- first surface;

[0047] 14-a first passivation isolation layer;

[0048] 141-Isolation Department;

[0049] 141a-first isolation part;

[0050] 141b- second isolation part;

[0051] 141c-third isolation section;

[0052] 15- a second passivation isolation layer;

[0053] 16-Metal electrode. DETAILED DESCRIPTION

[0054] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0055] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0056] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0057] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0058] Tandem cells are usually composed of a top cell unit with a wide bandgap and a bottom cell unit with a narrow bandgap, which enables them to match the absorption of the sunlight spectrum, thereby enabling the photoelectric conversion efficiency to exceed 34%. Figure 1 As shown, along the thickness direction of the laminated battery 1, the top battery unit 11 and the bottom battery unit 12 are arranged in sequence, and a composite layer 13 is also arranged between the top battery unit 11 and the bottom battery unit 12. The laminated battery 1 usually uses a conductive oxide film (such as indium tin oxide, indium zinc oxide) as the middle composite layer 13, and carriers can be recombined in the composite layer 13.

[0059] Among them, the top battery unit 11 can be a perovskite battery, and the bottom battery unit 12 can be a crystalline silicon battery. Along the thickness direction of the stacked battery 1, the top battery unit 11 includes a transparent conductive oxide layer 115, a buffer layer 114, an electron transport layer 113, a perovskite layer 112 and a hole transport layer 111 stacked in sequence. The hole transport layer 111 is in contact with the composite layer 13. While transferring charge to the composite layer 13, it can also play a role in separating the perovskite layer 112 and the composite layer 13 to avoid contact between the perovskite layer 112 and the composite layer 13. However, due to the thin thickness of the hole transport layer 111 (the thickness is usually 10nm), during the actual use of the stacked battery 1, the hole transport layer 111 is prone to form a discontinuous structure, resulting in the inability to completely separate the perovskite layer 112 and the composite layer 13, so that the perovskite layer 112 in some areas is in contact with the composite layer 13, causing leakage in the stacked battery 1, greatly reducing the working performance of the stacked battery 1.

[0060] To solve the above technical problems, Figure 2As shown, an embodiment of the present application provides a laminated battery 1, comprising a top battery cell 11, a bottom battery cell 12, and a composite layer 13 located between the top battery cell 11 and the bottom battery cell 12, wherein along the thickness direction of the laminated battery 1, the composite layer 13 has a first surface 131 facing the top battery cell 11, a first passivation isolation layer 14 is disposed on the first surface 131, and a surface area of ​​the first passivation isolation layer 14 is smaller than a surface area of ​​the first surface 131.

[0061] In this embodiment, by providing the first passivation isolation layer 14 on the first surface 131, the separation effect of the perovskite layer 112 and the composite layer 13 can be improved, the contact phenomenon between the perovskite layer 112 and the composite layer 13 can be reduced, and the possibility of leakage of the laminated battery 1 can be significantly reduced, thereby ensuring the working performance of the laminated battery 1. In addition, the surface area of ​​the first passivation isolation layer 14 is smaller than the surface area of ​​the first surface 131, so that the first passivation isolation layer 14 does not completely cover the first surface 131, thereby preventing the first passivation isolation layer 14 from completely separating the hole transport layer 111 and the composite layer 13, so that carriers can flow between the hole transport layer 111 and the composite layer 13, and ensuring that the laminated battery 1 can be used normally.

[0062] The first passivation isolation layer 14 includes at least one of metal oxide and non-metal oxide. For example, when the first passivation isolation layer 14 is composed of metal oxide, it can be aluminum oxide, yttrium oxide, ytterbium oxide, silicon oxide and other materials. When the first passivation isolation layer 14 is composed of non-metal oxide, it can be silicon-based oxide material. When the first passivation isolation layer 14 is composed of metal oxide and non-metal oxide, it can be a mixed material of the above-mentioned metal oxide and non-metal oxide.

[0063] In a specific embodiment, Figure 2 As shown, the first passivation isolation layer 14 may include a plurality of isolation portions 141 disposed at intervals.

[0064] In this embodiment, when the hole transport layer 111 is a discontinuous structure, there are defective positions in the hole transport layer 111, and the multiple isolation parts 141 can separate the composite layer 13 and the perovskite layer 112 at the region corresponding to the defective position of the hole transport layer 111. In addition, the multiple isolation parts 141 of the first passivation isolation layer 14 are arranged at intervals, so that the possibility of the isolation parts 141 being located at the defective region is increased, and the separation effect of the composite layer 13 and the perovskite layer 112 is further improved.

[0065] In the above embodiment, Figure 3As shown, the isolation portion 141 may include a combination of any one or more of a first isolation portion 141a, a second isolation portion 141b and a third isolation portion 141c, wherein the thickness of the first isolation portion 141a is less than the thickness of the hole transport layer 111, the thickness of the second isolation portion 141b is equal to the thickness of the hole transport layer 111, the thickness of the third isolation portion 141c is greater than the thickness of the hole transport layer 111, and the second isolation portion 141b and the third isolation portion 141c are in contact with the perovskite layer 112.

[0066] In this embodiment, the thickness of the first isolation portion 141a is made smaller than the thickness of the hole transport layer 111, so that the hole transport layer 111 can completely cover the first isolation portion 141a, so that the first isolation portion 141a can not only fill the defective positions of the hole transport layer 111, but also reduce the influence of the first isolation portion 141a on the carrier conduction rate.

[0067] The thickness L1 of the first isolation portion 141 a satisfies 0.1 nm<L1<10 nm. For example, the thickness L1 of the first isolation portion 141 a may be 0.1 nm, 3 nm, 7 nm, 9 nm, etc.

[0068] The thickness of the second isolation portion 141b is made equal to the thickness of the hole transport layer 111, so that the top surface of the second isolation portion 141b can contact the perovskite layer 112, so that the first passivation isolation layer 14 can not only separate the composite layer 13 and the perovskite layer 112, but also passivate the perovskite layer 112, so as to improve the working performance of the top battery unit 11.

[0069] The thickness L2 of the second isolation portion 141 b is 10 nm.

[0070] The thickness of the third isolation portion 141c is made greater than the thickness of the hole transport layer 111, so that the perovskite layer 112 can cover part of the third isolation layer 141c structure, thereby increasing the contact area between the perovskite layer 112 and the third isolation portion 141c, and can further enhance the passivation effect of the third isolation portion 141c on the perovskite layer 112, thereby further enhancing the working performance of the top battery unit 11.

[0071] The thickness L3 of the third isolation portion 141c satisfies 10nm<L3<200nm. For example, the thickness L3 of the third isolation portion 141c may be 12nm, 50nm, 150nm, 180nm, etc.

[0072] In a specific embodiment, Figure 3As shown, when the isolation portion 141 of the first passivation isolation layer 14 includes any two or more combinations of the first isolation portion 141a, the second isolation portion 141b and the third isolation portion 141c, the first passivation isolation layer 14 can not only separate the perovskite layer 112 and the composite layer 13, but also have a passivation effect on the top battery unit 11, thereby significantly improving the working performance of the stacked battery 1.

[0073] In the above embodiment, the first passivation isolation layer 14 may be Figure 2 and Figure 3 The discontinuous structure shown may also be a continuous structure (not shown in the figure), as long as the surface area of ​​the first passivation isolation layer 14 is smaller than the surface area of ​​the first surface 131 .

[0074] The ratio of the surface area of ​​the first passivation isolation layer 14 to the surface area of ​​the first surface 131 may be 0.01-0.8. This allows the first passivation isolation layer 14 to separate the composite layer 13 and the perovskite layer 112 while avoiding affecting the normal flow of carriers in the laminated battery 1, thereby ensuring that the laminated battery 1 can operate normally. For example, the ratio of the surface area of ​​the first passivation isolation layer 14 to the surface area of ​​the first surface 131 may be 0.01, 0.3, 0.5, 0.8, etc.

[0075] In a specific embodiment, Figure 4 As shown, the bottom battery cell 12 may include an amorphous silicon layer 122 connected to the composite layer 13, the amorphous silicon layer 122 has a second surface 124 facing the composite layer 13, the second surface 124 is provided with a second passivation isolation layer 15, the surface of the second passivation isolation layer 15 is smaller than the surface area of ​​the second surface 124, and the thickness of the second passivation isolation layer 15 is less than the thickness of the composite layer 13.

[0076] In this embodiment, the second passivation isolation layer 15 can have a passivation effect on the amorphous silicon layer 122 to improve the working performance of the bottom battery unit 12. At the same time, the surface area of ​​the second passivation isolation layer 15 is smaller than the surface area of ​​the second surface 124, so as to avoid the second passivation isolation layer 15 completely separating the amorphous silicon layer 122 and the composite layer 13, thereby ensuring the normal flow of carriers in the laminated battery 1, and the thickness of the second passivation isolation layer 15 is smaller than the thickness of the composite layer 13, so that the composite layer 13 can cover the second passivation isolation layer 15, thereby avoiding the second passivation isolation layer 15 from affecting the recombination process of carriers inside the composite layer 13, thereby ensuring that the laminated battery 1 can be used normally.

[0077] The second passivation isolation layer 15 includes at least one of metal oxide and non-metal oxide. For example, when the second passivation isolation layer 15 is composed of metal oxide, it can be aluminum oxide, yttrium oxide, ytterbium oxide, silicon oxide and other materials. When the second passivation isolation layer 15 is composed of non-metal oxide, it can be silicon-based oxide material. When the second passivation isolation layer 15 is composed of metal oxide and non-metal oxide, it can be a mixed material of the above-mentioned metal oxide and non-metal oxide.

[0078] In addition, the thickness L4 of the second passivation isolation layer 15 satisfies 0.1nm<L4<30nm, and while having a passivation effect on the bottom battery unit 12, it can also prevent the second passivation isolation layer 15 from affecting the recombination of carriers in the recombination layer 13, ensuring that the laminated battery 1 can be used normally. For example, the specific thickness L4 of the second passivation isolation layer 15 can be 0.1nm, 10nm, 20nm, 29nm, etc.

[0079] In the above embodiment, the second passivation isolation layer 15 may be Figure 4 The discontinuous structure shown may also be a continuous structure (not shown in the figure), as long as the surface area of ​​the second passivation isolation layer 15 is smaller than the surface area of ​​the second surface 124 .

[0080] The ratio of the surface area of ​​the second passivation isolation layer 15 to the surface area of ​​the second surface 124 may be 0.01-0.8. This allows the second passivation isolation layer 15 to passivate the amorphous silicon layer 122 while avoiding affecting the normal flow of carriers in the laminated battery 1, thereby ensuring that the laminated battery 1 can operate normally. For example, the ratio of the surface area of ​​the second passivation isolation layer 15 to the surface area of ​​the second surface 124 may be 0.01, 0.3, 0.5, 0.8, etc.

[0081] The present application also provides a method for preparing the laminated battery 1. Figures 2 to 3 As shown, the preparation method of the laminated battery 1 includes but is not limited to the following steps:

[0082] S11: preparing a bottom battery unit 12;

[0083] S12: preparing a composite layer 13 on top of the bottom battery unit 12;

[0084] S13: preparing a first passivation isolation layer 14 on the first surface 131 of the composite layer 13, and making the surface area of ​​the first passivation isolation layer 14 smaller than the surface area of ​​the first surface 131;

[0085] S14 : preparing a top battery unit 11 on the composite layer 13 and the first passivation isolation layer 14 .

[0086] In this embodiment, by preparing the first passivation isolation layer 14 on the first surface 131 and making the surface area of ​​the first passivation isolation layer 14 smaller than the surface area of ​​the first surface 131, the first passivation isolation layer 14 can not only separate the perovskite layer 112 and the composite layer 13, but also avoid the first passivation isolation layer 14 affecting the normal flow of carriers in the stacked battery 1.

[0087] In a specific embodiment, Figure 4 As shown, after preparing the bottom battery unit 12 and before preparing the composite layer 13, the preparation method S11 of the laminated battery 1 is specifically as follows:

[0088] S111: preparing a bottom battery unit 12;

[0089] S112 : preparing a second passivation isolation layer 15 on the second surface 124 of the bottom battery cell 12 , wherein the surface area of ​​the second passivation isolation layer 15 is smaller than the surface area of ​​the second surface 124 .

[0090] When preparing the composite layer 13, the preparation method S12 of the laminated battery 1 is specifically as follows:

[0091] S121 : preparing a composite layer 13 on the second surface 124 and the second passivation isolation layer 15 , so that the composite layer 13 covers the second passivation isolation layer 15 .

[0092] In this embodiment, by preparing the second passivation isolation layer 15 on the second surface 124 and making the surface area of ​​the second passivation isolation layer 15 smaller than the surface area of ​​the second surface 124, the second passivation isolation layer 15 can not only play a passivation effect on the bottom battery unit 12, but also prevent the second passivation isolation layer 15 from affecting the normal flow of carriers in the laminated battery 1. In addition, a composite layer 13 is prepared on the second surface 124 and the second passivation isolation layer 15, so that the composite layer 13 covers the second passivation isolation layer 15, and the second passivation isolation layer 15 is prevented from affecting the recombination of carriers in the composite layer 13, thereby ensuring the normal use of the laminated battery 1.

[0093] In the above embodiment, Figures 2 to 4 As shown, when preparing the first passivation isolation layer 14 on the first surface 131 of the composite layer 13, the preparation method S13 of the laminated battery 1 is specifically as follows:

[0094] S131 : spin coating an oxide solution on the first surface 131 of the composite layer 13 to obtain a first passivation isolation layer 14 .

[0095] In the above embodiment, Figure 4 As shown, when the second passivation isolation layer 15 is prepared on the second surface 124 of the bottom battery unit 12, the preparation method S112 of the laminated battery 1 is specifically as follows:

[0096] S1121 : spin-coating an oxide solution on the second surface 124 of the bottom battery unit 12 to obtain the second passivation isolation layer 15 .

[0097] In this embodiment, when the first passivation isolation layer 14 and the second passivation isolation layer 15 are prepared by spin coating, the discontinuous structure can be controlled by controlling the particle size of the oxide solution and the rotation speed during spin coating to meet the use requirements of the stacked battery 1.

[0098] In the above embodiments, Figures 2 to 4 As shown, to ensure that the first passivation isolation layer 14 and the second passivation isolation layer 15 are discontinuous structures, the particle size of the oxide solution is 10nm-200nm, the rotation speed during spin coating is 2000rpm-8000rpm, and the solubility of the oxide solution is 0.2wt%-20wt%.

[0099] In this embodiment, the particle size of the oxide solution is 10nm-200nm, the rotation speed during spin coating is 2000rpm-8000rpm, and the solubility of the oxide solution is 0.2wt%-20wt%, so that the first passivation isolation layer 14 can be a discontinuous structure, so that the first passivation isolation layer 14 can not only have a separation effect on the composite layer 13 and the perovskite layer 112, but also avoid the first passivation isolation layer 14 affecting the flow of carriers in the laminated battery 1. At the same time, the second passivation isolation layer 15 can be a discontinuous structure, so that the second passivation isolation layer 15 can not only have a passivation effect on the bottom battery unit 12, but also avoid the second passivation isolation layer 15 affecting the flow of carriers in the laminated battery 1.

[0100] At the same time, if Figure 3 As shown, when preparing the first passivation isolation layer 14, by changing the particle size of the oxide solution, the rotation speed during spin coating and the solubility of the oxide solution, it is also possible to prepare isolation portions 141 with different thicknesses.

[0101] Specifically, when preparing the first isolation portion 141a, the particle size of the oxide solution is 10nm-30nm, the rotation speed during spin coating is 5000rpm-8000rpm, and the solubility of the oxide solution is 0.2wt%-2wt%, so that the thickness of the first isolation portion 141a is less than the thickness of the hole transport layer 111.

[0102] When preparing the second isolation portion 141b, the particle size of the oxide solution is 30nm-50nm, the rotation speed during spin coating is 3000rpm-8000rpm, and the solubility of the oxide solution is 0.2wt%-10wt%, so that the thickness of the second isolation portion 141b is equal to the thickness of the hole transport layer 111.

[0103] When preparing the third isolation portion 141c, the particle size of the oxide solution is 50nm-200nm, the rotation speed during spin coating is 2000rpm-8000rpm, and the solubility of the oxide solution is 0.2wt%-20wt%, so that the thickness of the third isolation portion 141c is greater than the thickness of the hole transport layer 111.

[0104] In a specific embodiment, taking the bottom battery unit in the stacked battery as an N-type crystalline silicon battery as an example, the preparation method of the stacked battery specifically includes but is not limited to the following steps:

[0105] Step 1: placing an N-type single crystal silicon substrate in a potassium hydroxide solution for etching, and obtaining an N-type single crystal silicon layer with a thickness of 150 μm after cleaning;

[0106] Step 2: On the front side of the N-type single crystal silicon layer, an intrinsic amorphous silicon layer and an N-type amorphous silicon layer are sequentially deposited by plasma enhanced chemical vapor deposition to obtain an intrinsic amorphous silicon layer with a thickness of 5 nm and an N-type intrinsic amorphous silicon layer with a thickness of 10 nm;

[0107] Step 3: On the back side of the N-type single crystal silicon layer, an intrinsic amorphous silicon layer and a P-type amorphous silicon layer are sequentially deposited by plasma enhanced chemical vapor deposition to obtain an intrinsic amorphous silicon layer with a thickness of 5 nm and a P-type intrinsic amorphous silicon layer with a thickness of 10 nm;

[0108] Step 4: magnetron sputtering indium tin oxide on the P-type amorphous silicon layer to obtain a conductive layer with a thickness of 100 nm;

[0109] Step 5: magnetron sputtering indium tin oxide on the N-type amorphous silicon layer to obtain a composite layer with a thickness of 30 nm;

[0110] Step 6: Spin-coating an oxide solution on the composite layer to obtain a first passivation isolation layer;

[0111] Step 7: Spin-coat polyethylene glycol monomethyl ether on the composite layer and the first passivation isolation layer to obtain a 10 nm hole transport layer;

[0112] Step 8: Spin-coat the perovskite precursor solution on the hole transport layer, extract with ethyl acetate, and anneal at 120° C. for 15 minutes to obtain a hole transport layer of 800 nm;

[0113] Step 9: Prepare a 15 nm electron transport layer on the perovskite layer by thermal evaporation;

[0114] Step 10: Prepare a 20 nm tin dioxide buffer layer on the electron transport layer by atomic layer deposition;

[0115] Step 11: Prepare a 40nm transparent conductive film on the buffer layer using a DC power supply;

[0116] Step 12: Prepare metal electrodes on the front and back surfaces of the stacked battery by thermal evaporation.

[0117] In the above embodiment, when it is necessary to prepare a second passivation isolation layer, step 2 specifically includes:

[0118] Step 2.1: On the front side of the N-type single crystal silicon layer, an intrinsic amorphous silicon layer and an N-type amorphous silicon layer are sequentially deposited by plasma enhanced chemical vapor deposition to obtain an intrinsic amorphous silicon layer with a thickness of 5 nm and an N-type intrinsic amorphous silicon layer with a thickness of 10 nm;

[0119] Step 2.2: Spin-coat an oxide solution on the N-type intrinsic amorphous silicon layer to obtain a second passivation isolation layer.

[0120] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A laminated battery, characterized in that: The stacked battery (1) comprises a top battery unit (11), a bottom battery unit (12), and a composite layer (13) located between the top battery unit (11) and the bottom battery unit (12); Along the thickness direction of the laminated battery (1), the composite layer (13) has a first surface (131) facing the top battery unit (11), and a first passivation isolation layer (14) is provided on the first surface (131); The surface area of ​​the first passivation isolation layer (14) is smaller than the surface area of ​​the first surface (131).

2. The laminated battery according to claim 1, characterized in that: The first passivation isolation layer (14) comprises a plurality of isolation portions (141) arranged at intervals.

3. The laminated battery according to claim 2, characterized in that: The top battery unit (11) comprises a stacked perovskite layer (112) and a hole transport layer (111), and the isolation portion (141) comprises a combination of any one or more of a first isolation portion (141a), a second isolation portion (141b) and a third isolation portion (141c), wherein the thickness of the first isolation portion (141a) is less than the thickness of the hole transport layer (111), the thickness of the second isolation portion (141b) is equal to the thickness of the hole transport layer (111), and the thickness of the third isolation portion (141c) is greater than the thickness of the hole transport layer (111); The second isolation portion (141b) and the third isolation portion (141c) are in contact with the perovskite layer (112).

4. The laminated battery according to claim 2, characterized in that: The bottom battery unit (12) comprises an amorphous silicon layer (122) connected to the composite layer (13), the amorphous silicon layer (122) having a second surface (124) facing the composite layer (13), and the second surface (124) is provided with a second passivation isolation layer (15); The surface area of ​​the second passivation isolation layer (15) is smaller than the surface area of ​​the second surface (124), and the thickness of the second passivation isolation layer (15) is smaller than the thickness of the composite layer (13).

5. The laminated battery according to claim 4, characterized in that: The thickness of the first passivation isolation layer (14) is 0.1 nm-200 nm, and / or the thickness of the second passivation isolation layer (15) is 0.1 nm-30 nm.

6. The laminated battery according to claim 4, characterized in that: The first passivation isolation layer (14) and the second passivation isolation layer (15) contain at least one of a metal oxide and a non-metal oxide.

7. The laminated battery according to claim 4, characterized in that: The ratio of the surface area of ​​the first passivation isolation layer (14) to the surface area of ​​the first surface (131) is 0.01-0.8, and / or the ratio of the surface area of ​​the second passivation isolation layer (15) to the surface area of ​​the second surface (124) is 0.01-0.

8.

8. A method for preparing a laminated battery, for preparing the laminated battery (1) according to any one of claims 1 to 7, characterized in that: The method for preparing the stacked battery (1) comprises: preparing a bottom battery cell (12); Preparing a composite layer (13) on top of the bottom battery cell (12); Preparing a first passivation isolation layer (14) on the first surface (131) of the composite layer (13), and making the surface area of ​​the first passivation isolation layer (14) smaller than the surface area of ​​the first surface (131); A top battery unit (11) is prepared on the composite layer (13) and the first passivation isolation layer (14).

9. The method for preparing a laminated battery according to claim 8, characterized in that: After preparing the bottom battery unit (12) and before preparing the composite layer (13), the method for preparing the laminated battery (1) comprises: Preparing a second passivation isolation layer (15) on the second surface (124) of the bottom battery unit (12), wherein the surface area of ​​the second passivation isolation layer (15) is smaller than the surface area of ​​the second surface (124); When preparing the composite layer (13), the method for preparing the stacked battery (1) specifically comprises: The composite layer (13) is prepared on the second surface (124) and the second passivation isolation layer (15), so that the composite layer (13) covers the second passivation isolation layer (15).

10. The method for preparing a laminated battery according to claim 9, characterized in that: When preparing the first passivation isolation layer (14) on the first surface (131) of the composite layer (13), the method for preparing the stacked battery (1) specifically comprises: Spin coating an oxide solution on the first surface (131) of the composite layer (13) to obtain the first passivation isolation layer (14); When preparing the second passivation isolation layer (15) on the second surface (124) of the bottom battery unit (12), the method for preparing the stacked battery (1) specifically comprises: Spin coating an oxide solution on the second surface (124) of the bottom battery unit (12) to obtain the second passivation isolation layer (15); The particle size of the oxide solution is 10 nm-200 nm, the spin coating speed is 2000 rpm-8000 rpm, and the solubility of the oxide solution is 0.2 wt%-20 wt%.

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