Method for preparing inorganic tin-based perovskite solar cell by physical vapor deposition

Abstract

The invention relates to a method for preparing an inorganic tin-based perovskite solar cell by physical vapor deposition. The inorganic tin-based perovskite solar cell is successively composed of a flexible polyimide conductive substrate, a tin-based perovskite CsSnI3 layer and an ultrathin metal-based transparent conductive film. The method includes the steps of 1) cleaning the substrate, 2) preparing a hole transport layer CuI by radio frequency magnetron sputtering, 3) preparing the tin-based perovskite CsSnI3 layer by vapor deposition, 4) preparing an electron transport layer ZnO by radiofrequency magnetron sputtering and 5) preparing the ultrathin metal-based transparent conductive film by a continuous magnetron sputtering method to form the inorganic tin-based perovskite solar cell. An absorption layer film prepared by the method has good crystallinity and easy-to-control morphology, the efficiency of the perovskite solar cell is improved, the stability of the perovskite solarcell is enhanced, the sensitivity of the perovskite solar cell to temperature and humidity is reduced, and at the same time, heavy metal pollution is effectively avoided.

Description

Technical field [0001] The invention relates to the technical field of perovskite solar cells, in particular to a method for preparing inorganic tin-based perovskite solar cells by adopting a physical vapor deposition method. Background technique [0002] Perovskite solar cells are solar cells with organic or inorganic metal halides with a perovskite structure as the absorption layer. Since 2012, the photoelectric conversion rate of perovskite solar cells has been continuously improved. The research team of British scientist Snaith adopted a low-temperature process and used mesoscopic loose insulation Al 2 O 3 The thin film is used as the electron transport layer in the perovskite solar cell, with organic perovskite CH 3 NH 3 PbI 3 As the absorption layer, with phenylbutyrate (PCMB-BCP) as the hole transport layer, the photoelectric conversion rate of the planar heterojunction cell prepared can be as high as 15.9%. However, this battery still has the following problems to be solv...

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Problems solved by technology

However, there are still the following problems to be solved in this battery: (1) organic perovskite CH 3 NH 3 PB 3 Poor stability, sensitive to temperature and humidity changes; (2) The use of heavy metal lead compounds may cause pollution to the environment; (3) The preparation of mesoscopic metal oxides requires high temperatures above 500 ° C, which limits the use of organic flexible substrates ; (4) The chemical solution method is often used in the preparation process, which makes it difficult to control the thickness and roughness of the film; (5) The organic hole transport material is expensive

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