全无机卤素钙钛矿CsPbCl3 的CVD制备及其离子交换的研究

Inorganic halide perovskite has become a hot new semiconductor material in recent years and has received widespread attention in the fields of optoelectronics, new energy, and other fields. Researchers have been committed to preparing high-quality inorganic halide perovskite single crystal materials. How to achieve high-quality growth of perovskite single crystals has always been an urgent problem to overcome. This paper introduces a method for preparing halogenated inorganic perovskite CsPbCl3 and CsPbBr3 by chemical vapor deposition (CVD). Combining microscope and spectral characterization, it was found that the perovskite material with a lamellar structure exhibited prominent luminescence at the edges and had high luminous efficiency. In addition, the wavelength corresponding to the curve peak in the PL image is consistent with previous reports. Scanning electron microscope (SEM) images show that the surface of perovskite is smooth and of high quality. Energy dispersive spectroscopy (EDS) images show that the three elements are uniformly distributed in perovskite single crystals. Finally, the prepared CsPbCl3 and CsPbBr3 single crystal materials were used for liquid phase and gas phase ion exchange, respectively, and good experimental results were achieved, enabling continuous adjustable spectrum and band gap of perovskite. Perovskite ion exchange in local space has high ion exchange efficiency, simple exchange conditions, and short exchange time, providing a new research idea for the study of ion exchange of perovskite.