CN-122003014-A - Perovskite solar cell and design method of interface fusion layer of perovskite solar cell

CN122003014ACN 122003014 ACN122003014 ACN 122003014ACN-122003014-A

Abstract

The application discloses a perovskite solar cell and a design method of an interface fusion layer thereof, and belongs to the technical field of photovoltaics. The solar cell comprises an electron transport layer, an interface fusion layer, a perovskite film, a hole transport layer and an electrode which are arranged in a stacked mode, wherein the interface fusion layer is of an organic-inorganic hybrid perovskite structure formed by reacting an organic compound in the electron transport layer with lead iodide in the perovskite film. The organic-inorganic hybrid perovskite structure formed by the reaction of the organic compound in the electron transport layer and the lead iodide in the perovskite film is arranged between the electron transport layer and the perovskite film, so that the bonding toughness can be enhanced, the generation of transverse cracks in the mechanical bending process can be effectively inhibited, and the mechanical stability of the flexible perovskite solar cell is improved.

Inventors

ZHANG JINXIA
LIU BING
WANG JIXUE
XU DONGSHENG
LI QI
LI XIAOLEI
TAN HAIREN
SUN PEIJUN
Zhong Zhehan
HAO LIZHONG

Assignees

电力规划总院有限公司
南京大学
北京大学

Dates

Publication Date: 20260508
Application Date: 20250527

Claims (10)

1. The perovskite solar cell is characterized by comprising an electron transport layer, an interface fusion layer, a perovskite film, a hole transport layer and an electrode which are stacked, wherein the interface fusion layer is an organic-inorganic hybrid perovskite structure formed by reacting an organic compound in the electron transport layer with lead iodide in the perovskite film.
2. The perovskite solar cell of claim 1 wherein the organic compound comprises one of phenethylammonium iodide, benzyl ammonium iodide, methyl ammonium hydroiodide, formamidine hydroiodide.
3. An interface fusion layer design method of a perovskite solar cell, which is characterized by comprising the following steps: Mixing an organic compound and a tin oxide nanocrystalline solution to obtain a first solvent, wherein the organic compound can react with lead iodide to form an organic-inorganic hybrid perovskite structure; preparing an electron transport layer based on the first solvent; spin-coating a perovskite precursor solution on the electron transport layer to form a perovskite thin film and an interface fusion layer positioned between the electron transport layer and the perovskite thin film, wherein the interface fusion layer is formed by the reaction of the organic compound and lead iodide in the perovskite thin film; And stacking the electron transport layer, the interface fusion layer, the perovskite thin film, the hole transport layer and the electrode to obtain the perovskite solar cell.
4. The method of claim 3, wherein the organic compound comprises one of phenethyl ammonium iodide, benzyl ammonium iodide, methyl ammonium hydroiodide, formamidine hydroiodide.
5. The method of any one of claims 3 or 4, wherein the preparing an electron transport layer based on the first solvent comprises: dropwise adding the first solvent to the flexible conductive substrate; And spin-coating the first solvent on the surface of the flexible conductive substrate under a first rotating speed condition, and performing first annealing after the spin-coating is completed to obtain the electron transport layer, wherein the duration of the spin-coating is 25s-35s, and the first rotating speed is 2400rpm-2600rpm.
6. The method of claim 5, wherein the first anneal is at a temperature in the range of 100 ℃ to 120 ℃ and has a duration in the range of 1h to 2h.
7. The method of any one of claims 3 or 4, wherein spin-coating a perovskite precursor solution on the electron transport layer to form a perovskite thin film and an interfacial fusion layer between the electron transport layer and the perovskite thin film, comprising: dropwise adding the perovskite precursor solution into the electron transport layer; Carrying out first spin coating on the perovskite precursor solution on the surface of the electron transport layer under the condition of a second rotating speed, wherein the second rotating speed is 800rpm-1200rpm, and the duration of the first spin coating is 6s-10s; carrying out second spin coating on the perovskite precursor solution on the surface of the electron transport layer under the condition of a third rotating speed, wherein the third rotating speed is 3500-4500 rpm, and the duration of the second spin coating is 25-35 s; Annealing the electron transport layer after the second spin coating is completed, so as to form the perovskite film and the interface fusion layer on the electron transport layer.
8. The method of claim 7, wherein before annealing the electron transport layer after the second spin-coating is completed to form the perovskite thin film and the interfacial fusion layer on the electron transport layer, the method further comprises: and dropwise adding an antisolvent anisole on the surface of the coating of the electron transport layer within 8-12 s before the second spin coating process is finished.
9. The method of claim 7, wherein annealing the electron transport layer after the second spin-coating is completed to form the perovskite thin film and the interfacial fusion layer on the electron transport layer comprises: And annealing the electron transport layer subjected to the second spin coating in a first temperature interval to form the perovskite film and the interface fusion layer on the electron transport layer, wherein the first temperature interval is 100-120 ℃.
10. The method according to any one of claims 3 or 4, wherein the volume ratio between dimethylformamide DMF and dimethylsulfoxide DMSO in the perovskite precursor solution is 4:1 to 9:1.

Description

Perovskite solar cell and design method of interface fusion layer of perovskite solar cell Technical Field The application belongs to the technical field of photovoltaics, and particularly relates to a perovskite solar cell and a design method of an interface fusion layer of the perovskite solar cell. Background Perovskite solar cells have a wide application prospect due to their excellent light absorption capacity, high carrier mobility, long diffusion distance and low-cost solution processing characteristics, and have been rapidly developed in the photovoltaic field in recent years. In the prior art, as a method for stabilizing a perovskite/hole transport layer interface by a multidentate chelate biomaterial and a preparation method of a formal photovoltaic device (CN 117545285A), a carbon-based perovskite solar cell based on an interface engineering strategy and a preparation method thereof (CN 118660464A), a preparation method of a perovskite solar cell with a directional interface modification layer (CN 119365042A), a perovskite solar cell and a preparation method thereof, a photovoltaic system (CN 119343021A), and a perovskite solar cell disclosed in patents such as a perovskite solar cell (CN 119604118A), the perovskite film, particularly the interface between the perovskite film and the electron transport layer, is easy to crack in a mechanical bending process, so that the mechanical stability of the flexible perovskite device is poor, and the service life is reduced. Disclosure of Invention The embodiment of the application aims to provide a perovskite solar cell and a design method of an interface fusion layer thereof, which can solve the problem of poor mechanical stability of the current perovskite solar cell. In a first aspect, an embodiment of the present application provides a perovskite solar cell, including an electron transport layer, an interface fusion layer, a perovskite thin film, a hole transport layer, and an electrode that are stacked, where the interface fusion layer is an organic-inorganic hybrid perovskite structure formed by reacting an organic compound in the electron transport layer with lead iodide in the perovskite thin film. Optionally, the organic compound comprises one of phenethylammonium iodide, benzyl ammonium iodide, methyl ammonium hydroiodide, formamidine hydroiodide. In a second aspect, an embodiment of the present application provides a method for designing an interface fusion layer of a perovskite solar cell, where the method includes: Mixing an organic compound and a tin oxide nanocrystalline solution to obtain a first solvent, wherein the organic compound can react with lead iodide to form an organic-inorganic hybrid perovskite structure; preparing an electron transport layer based on the first solvent; spin-coating a perovskite precursor solution on the electron transport layer to form a perovskite thin film and an interface fusion layer positioned between the electron transport layer and the perovskite thin film, wherein the interface fusion layer is formed by the reaction of the organic compound and lead iodide in the perovskite thin film; And stacking the electron transport layer, the interface fusion layer, the perovskite thin film, the hole transport layer and the electrode to obtain the perovskite solar cell. Optionally, the organic compound comprises one of phenethylammonium iodide, benzyl ammonium iodide, methyl ammonium hydroiodide, formamidine hydroiodide. Optionally, the preparing an electron transport layer based on the first solvent includes: dropwise adding the first solvent to the flexible conductive substrate; And spin-coating the first solvent on the surface of the flexible conductive substrate under a first rotating speed condition, and performing first annealing after the spin-coating is completed to obtain the electron transport layer, wherein the duration of the spin-coating is 25s-35s, and the first rotating speed is 2400rpm-2600rpm. Optionally, the temperature interval of the first annealing is 100 ℃ to 120 ℃, and the duration of the first annealing is 1h to 2h. Optionally, spin-coating a perovskite precursor solution on the electron transport layer to form a perovskite thin film and an interface fusion layer between the electron transport layer and the perovskite thin film, including: dropwise adding the perovskite precursor solution into the electron transport layer; Carrying out first spin coating on the perovskite precursor solution on the surface of the electron transport layer under the condition of a second rotating speed, wherein the second rotating speed is 800rpm-1200rpm, and the duration of the first spin coating is 6s-10s; carrying out second spin coating on the perovskite precursor solution on the surface of the electron transport layer under the condition of a third rotating speed, wherein the third rotating speed is 3500-4500 rpm, and the duration of the second spin coating is 25-35 s; Annealing the electron transport laye