Perovskite solar cell

Abstract

The utility model discloses a perovskite solar cell, which relates to the photovoltaic field and comprises a conductive substrate, a Bragg reflection layer, a perovskite layer, a hole transport layer and a metal electrode layer, and the conductive substrate, the Bragg reflection layer, the perovskite layer, the hole transport layer and the metal electrode layer are sequentially arranged from bottom to top. The perovskite solar cell has the advantages that by optimizing the composition of each layer of the perovskite solar cell, the full absorption of light and the efficient photo-generated charge separation are realized, and the photoelectric conversion efficiency and the stability are improved.

Description

Technical Field

[0001] The utility model relates to the photovoltaic field, in particular to a perovskite solar cell. Background Art

[0002] With the growing demand for renewable energy, solar cell technology has become a hot topic of research. Perovskite solar cells, with their excellent photoelectric conversion efficiency, low manufacturing cost, and ease of large-scale production, hold enormous potential for development in the photovoltaic field. After decades of research, the photoelectric conversion efficiency of single-junction perovskite solar cells has increased from 3.8% in 2009 to 26.14% in 2023. Compared to first-generation silicon-based solar cells and second-generation thin-film solar cells, perovskite solar cells represent the third generation of solar cells, thanks to their high photoelectric conversion efficiency, low manufacturing cost, and flexibility. However, practical applications of perovskite solar cells still present several challenges, such as low light absorption efficiency, poor charge transfer performance, and poor stability. Therefore, optimizing the structural design of perovskite solar cells to improve their photoelectric conversion efficiency and stability has become a crucial research topic. Utility Model Content

[0003] The technical problem to be solved by the utility model is to improve the photoelectric conversion efficiency and stability of perovskite solar cells.

[0004] The utility model solves the above technical problems through the following technical means: a perovskite solar cell includes a conductive substrate, a Bragg reflection layer, a perovskite layer, a hole transport layer and a metal electrode layer, wherein the conductive substrate, Bragg reflection layer, perovskite layer, hole transport layer and metal electrode layer are arranged in sequence from bottom to top.

[0005] As an optimized technical solution, the Bragg reflection layer includes a SnO2 layer, a TiO2 layer and a SnO2 layer arranged in sequence from bottom to top.

[0006] As an optimized technical solution, the thickness of each layer of the Bragg reflection layer is 9.5 to 10.5 nm, and the thickness of the perovskite layer is 950 to 1050 nm.

[0007] As an optimized technical solution, the thickness of each layer of the Bragg reflection layer is 14.5-15.5 nm, and the thickness of the perovskite layer is 1450-1550 nm.

[0008] As an optimized technical solution, the perovskite solar cell further includes a protective layer, and the protective layer is disposed above the metal electrode layer.

[0009] As an optimized technical solution, the thickness of the hole transport layer is 19.5 to 20.5 nm, the thickness of the metal electrode layer is 115 to 125 nm, and the thickness of the protective layer is 9.5 to 10.5 nm.

[0010] As an optimized technical solution, the protective layer adopts Al2O3.

[0011] As an optimized technical solution, the conductive substrate adopts FTO glass.

[0012] As an optimized technical solution, the metal electrode layer adopts a silver electrode.

[0013] As an optimized technical solution, the hole transport layer adopts Spiro-OMeTAD.

[0014] The advantages of the present invention are:

[0015] 1. By optimizing the composition of each layer of perovskite solar cells, sufficient light absorption and efficient photogenerated charge separation are achieved, thereby improving the photoelectric conversion efficiency and stability.

[0016] 2. By optimizing the thickness of each layer of perovskite solar cells, full absorption of light and efficient separation of photogenerated charges are further achieved, thereby improving the photoelectric conversion efficiency and stability.

[0017] 3. By introducing a protective layer, the impact of environmental factors on battery performance is reduced, the weather resistance and stability of perovskite solar cells are enhanced, and the service life of perovskite solar cells is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a perovskite solar cell according to a first embodiment of the present invention.

[0019] Figure 2 This is a schematic structural diagram of a three-perovskite solar cell according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0021] Example 1

[0022] like Figure 1As shown, this embodiment discloses a perovskite solar cell, including a conductive substrate 1, a Bragg reflection layer 2, a perovskite layer 3, a hole transport layer 4 and a metal electrode layer 5.

[0023] The conductive substrate 1, Bragg reflection layer 2, perovskite layer 3, hole transport layer 4 and metal electrode layer 5 are arranged in sequence from bottom to top; the conductive substrate 1 adopts FTO glass, which is composed of a special glass substrate and a layer of wide-bandgap material FTO film, and the FTO film is composed of tin oxide (SnO2) and fluorine (F); the Bragg reflection layer 2 includes a SnO2 layer, a TiO2 layer and a SnO2 layer arranged in sequence from bottom to top, and the thickness of each layer is 9.5 to 10.5 nm. The Bragg reflection layer 2 can replace the electron transport layer; the thickness of the perovskite layer 3 is 950 to 1050 nm; the hole transport layer 4 adopts Spiro-OMeTAD, and the thickness of the hole transport layer 4 is 19.5 to 20.5 nm. The metal electrode layer 5 adopts a silver electrode, and the thickness of the metal electrode layer 5 is 115 to 125 nm.

[0024] The perovskite solar cell manufacturing method is as follows: first depositing a Bragg reflection layer 2 on a conductive substrate 1, then depositing a perovskite layer 3, then coating a hole transport layer 4 on the perovskite layer 3, and finally vapor-depositing a metal electrode layer 5 on the hole transport layer 4 to obtain a perovskite solar cell. By optimizing the thickness and composition of each layer, sufficient light absorption and efficient photogenerated charge separation are achieved, thereby improving the photoelectric conversion efficiency and stability.

[0025] Example 2

[0026] The difference between this embodiment and the first embodiment is that: based on the first embodiment, the thickness of each layer of the Bragg reflector 2 is 14.5 to 5.5 nm. Based on the first embodiment, the thickness of each layer of the Bragg reflector 2 is adjusted to achieve more efficient reflection and focusing of light; at the same time, the thickness of the perovskite layer 3 is increased to 1450 to 1550 nm, thereby improving the effective utilization rate of light and the photocurrent output; this embodiment achieves higher photoelectric conversion efficiency and stability by further optimizing the thickness and composition of each layer.

[0027] Example 3

[0028] like Figure 2 As shown, the difference between this embodiment and the first embodiment is that the perovskite solar cell further includes a protective layer 6, and the protective layer 6 is provided above the metal electrode layer 5. The protective layer 6 is made of Al2O3, and the thickness of the protective layer 6 is 9.5 to 10.5 nm. By introducing the protective layer 6, the influence of environmental factors on the battery performance is reduced, the weather resistance and stability of the perovskite solar cell are enhanced, and the service life of the perovskite solar cell is improved.

[0029] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A perovskite solar cell, characterized in that: The invention comprises a conductive substrate, a Bragg reflection layer, a perovskite layer, a hole transport layer and a metal electrode layer, wherein the conductive substrate, the Bragg reflection layer, the perovskite layer, the hole transport layer and the metal electrode layer are arranged in sequence from bottom to top.

2. The perovskite solar cell according to claim 1, wherein: The Bragg reflection layer includes a SnO2 layer, a TiO2 layer and a SnO2 layer arranged in sequence from bottom to top.

3. The perovskite solar cell according to claim 2, wherein: The thickness of each layer of the Bragg reflection layer is 9.5-10.5 nm, and the thickness of the perovskite layer is 950-1050 nm.

4. The perovskite solar cell according to claim 2, wherein: The thickness of each layer of the Bragg reflection layer is 14.5-15.5 nm, and the thickness of the perovskite layer is 1450-1550 nm.

5. The perovskite solar cell according to claim 1, wherein: The perovskite solar cell further includes a protective layer, and the protective layer is disposed above the metal electrode layer.

6. The perovskite solar cell according to claim 5, wherein: The thickness of the hole transport layer is 19.5 to 20.5 nm, the thickness of the metal electrode layer is 115 to 125 nm, and the thickness of the protective layer is 9.5 to 10.5 nm.

7. The perovskite solar cell according to claim 5, wherein: The protective layer is made of Al2O3.

8. The perovskite solar cell according to claim 1, wherein: The conductive substrate is made of FTO glass.

9. The perovskite solar cell according to claim 1, wherein: The metal electrode layer is a silver electrode.

10. The perovskite solar cell according to claim 1, wherein: The hole transport layer is made of Spiro-OMeTAD.

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