Epitaxial growth of perovskite single crystal photodiode array based on space limitation method

Organic inorganic composite perovskite has the advantages of high carrier mobility, long carrier lifetime, and long carrier diffusion length as a new type of optoelectronic material, which is widely used in solar cells, light-emitting diodes, photodetectors, and other fields. Besides, the photoelectric performance of organic inorganic composite perovskite single crystals have been further improved due to their few defects and no grain boundaries, which indicates that single crystal research is of great significance. In recent years, various organic inorganic composite perovskite single crystal diodes have been continuously reported, and there is a trend towards further development towards arrays. However, most of the existing research is on the same type of photodiode array, which has not formed multichannel photodetection devices. Therefore, this paper uses the space limitation method to epitaxial grow $2 * 2 \mathrm{MAPbBr}_{3}$ single crystals on MAPbCl
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single crystal substrate to form a single crystal photodiode array, aiming to lay the foundation for achieving multi-channel photoelectric detection in the future.