Method for improving growth quality of perovskite crystal and solar cell device

The invention discloses a method for improving the growth quality of perovskite crystal and a solar cell device. According to the method, a crystallized perovskite polycrystalline film is covered with an alcoholic solution of an inorganic salt; the grain sizes are increased; and meanwhile, the photoelectric properties of the polycrystalline film are improved. The solar cell device disclosed by the invention comprises a substrate, a transparent anode, a hole transport layer, a perovskite polycrystalline film layer, an electron transport layer, a hole blocking layer and a cathode which are sequentially superposed. By the method disclosed by the invention, the perovskite crystal can grow to 4-5 times that of the prior art in size; the process is simple; crystallization is quick; the stability and the repetition rate are high; the degree of dependency on the environment is low; and the cost is low. 本发明公开了种提高钙钛矿晶体生长质量的方法及太阳能电池器件，该方法为：将无机盐的醇溶液覆盖于已结晶的钙钛矿多晶薄膜上，使其晶粒尺寸变大，同时多晶薄膜的光电性能提高。本发明的太阳能电池器件包括依次叠加的基片、透明阳极、空穴传输层、钙钛