Method for preparing high-efficiency flexible perovskite solar cell through buried interface treatment

Abstract

The invention provides a method for preparing a high-efficiency flexible perovskite solar cell through bottom-buried interface treatment, and belongs to the technical field of solar cells. A tin dioxide layer containing ammonium formate is introduced between a tin dioxide electron transport layer and a 3D organic-inorganic hybrid perovskite thin film, so that the oxygen vacancy defect of the tin dioxide electron transport layer is reduced, and the performance of the solar cell is improved. The electron mobility is increased; and meanwhile, the formate ions participate in the subsequent film forming process of the 3D organic-inorganic hybrid perovskite thin film, so that the morphology of the thin film is improved, the defect state density is reduced, the unfavorable tensile stress is released, and the photoelectric efficiency, the environmental stability, the mechanical stability and other properties of the flexible perovskite solar cell are further improved.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a method for preparing a high-efficiency flexible perovskite solar cell by buried bottom interface treatment. Background technique [0002] Organic-inorganic hybrid perovskite (perovskite) materials are very suitable for the preparation of flexible perovskite solar cell devices due to their low cost, light weight, low fabrication temperature, and excellent optoelectronic properties, and their derivatives can be used in wearable bionics Electronic devices, handheld electronic devices, and various military equipment. So far, flexible perovskite solar cell devices have developed rapidly in terms of efficiency. In Chinese and foreign literature reports, flexible single-junction perovskite solar cells have increased from 2.62% in 2013 to 21.73% in 2021, while flexible calcium Titanite solar cells also broke through the 21% efficiency mark in tandem designs. [0003] ...

AI Technical Summary

Problems solved by technology

[0003] However, the flexible perovskite solar cells so far require a lower preparation temperature and the poor ability of flexible substrates to block water and oxygen, which is easy to cause phase transition and decomposition of perovskite materials, resulting in flexible perovskite solar cells. There is a significant gap between the device and the current rigid device made on the glass substrate in terms of photoelectric conversion efficiency and environmental stability, which hinders the further industrialization and commercialization of flexible perovskite solar cells.

[0004] At the same time, the lower preparation temperature will lead to the quality of the perovskite film deposited on the flexible material is not as good as the rigid one, the density of defect states will increase, the non-radiative recombination at the interface will be serious, and the carrier dynamics of the transport layer will be poor.

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