A kind of perovskite solar cell and preparation method thereof

Abstract

The invention provides a perovskite solar cell and a preparation method thereof. The perovskite solar cell comprises a substrate and an electron transport layer, a CsPbI layer disposed on the substrate in sequence 3 Perovskite layer, hole transport layer and metal electrode; The CsPbI 3 The preparation method of the perovskite layer is as follows: firstly, CsI and PbI are vapor-deposited simultaneously by dual heat sources. 2 Solid powder particles, one-step preparation of CsPbI 3 Precursor thin film; then adopt the step type annealing process to form the film. The present invention can directly prepare high-quality CsPbI in one step by utilizing dual-source co-evaporation 3 Compared with the widely used one-step spin coating method, this method is not only simple to operate, but also more suitable for obtaining high-purity, large-area films, and can control the thickness and shape of the film. At the same time, the gradient thermal annealing treatment can precisely control the growth of the crystal, reduce the defect density, and then construct high-quality CsPbI 3 film.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a perovskite solar cell and a preparation method thereof. Background technique [0002] In recent years, organic-inorganic hybrid perovskite solar cells have attracted the interest of researchers due to their advantages such as low band gap, high carrier mobility and high light absorption, but the most advanced organic lead halide perovskite The efficiency of solar cells (certified) has reached more than 70% of the theoretical limit, and the efficiency of all-inorganic CsPbI is very high X Br 3-X The cells were below 60 percent of their theoretical limit, highlighting their potential for greater efficiency gains. Compared with the organic-nonpolar hybrid perovskite (100°C), the all-inorganic perovskite has excellent thermal stability, and its heat-resistant temperature can reach more than 300°C. Therefore, the many advantages of all-inorganic perovskite materials make them...

AI Technical Summary

Problems solved by technology

However, there are still some problems that need to be overcome in all-inorganic perovskite solar cells, such as poor crystallization quality of the perovskite layer and sensitivity to humidity, resulting in poor stability of the battery device, and the efficiency needs to be further improved, etc.

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