基于二维钙钛矿异质结的高性能光电探测器

fter entering the 21st century, science and technology are developing at a rapid pace, and the consumption of traditional fossil fuels is also increasing during the development process. There is an urgent need for sustainable and clean energy represented by solar energy to replace fossil fuels. Perovskite materials have excellent photovoltaic properties, as well as strong photoluminescence and electroluminescence properties, which make them show great potential in the semiconductor field. Through the antisolvent vapor-assisted recrystallization method, two-dimensional halide perovskite single crystal materials were directly prepared, and a variety of heterojunction devices were built. Through energy band structure analysis and comparison of experimental rePreparation of 2D perovskite materials and research on heterojunction devicessults, it is proved that the (PEA)2PbI4/CsPbBr3 heterojunction photodetector has outstanding stability and high detection rate. In addition, analysis of the experimental results shows that the energy band structure of the heterojunction is Type-II staggered energy band. This structure is very conducive to the separation and transportation of photogenerated carriers and is more suitable for use as a photodetector. Finally, the device obtained Larger and more stable photocurrent, detection rate reaching 10^13 Jones level, and larger optical switching ratio.