卤化物钙钛矿单晶及光电探测器:研究进展和挑战

Halide Perovskite Single Crystals and Photodetectors:Research Progress and Challenges

近年来,由于金属卤化物钙钛矿材料展现出了优异的光学和电学特性(如高吸收系数、长载流子扩散长度、小激子结合能、高缺陷容限、可调带隙等性质),以及其具有低成本的溶液制备工艺,使其在光探测、光电转换和光发射等领域取得了巨大的科研进展。与钙钛矿多晶薄膜相比,钙钛矿单晶具有更长的载流子寿命、更高的载流子迁移率、更长的扩散长度、更低的陷阱密度等优势,从而促进了近十几年来钙钛矿单晶制备和优化的相关研究,并将高质量卤化物钙钛矿单晶广泛应用在光探测等重要应用领域。在这篇综述中,我们聚焦基于不同形式、不同化学组分卤化物钙钛矿单晶(包括单晶块体和单晶薄膜)的光电探测器技术领域的最新进展,首先系统综述了卤化物钙钛矿单晶的制备和优化进展,重点关注了三元阳离子杂化钙钛矿单晶的最新进展,然后全面介绍了基于钙钛矿单晶的各类型光电探测器研究现状,最后总结了卤化物钙钛矿单晶光电探测器研究领域目前面临的挑战并进行了展望,有望推动该领域的快速进步和发展。

In recent years,metal halide perovskite materials have made great scientific progress in the field of light detection,photoelectric conversion,and light emission due to their excellent optical and electrical properties(such as high absorption coefficient,long carrier diffusion length,small exciton binding energy,high defect tolerance,and adjustable band gap,etc.),and low-cost solution preparation process.In recent decades,scientific research on the preparation and optimization of perovskite single crystals has been promoted driven by their advantages compared to polycrystalline perovskite films.These advantages include longer carrier lifetime,higher carrier mobility,longer diffusion length,and lower trap density.High-quality halide perovskite single crystals have been widely used in important applications such as photodetection.This review focuses on the recent advancements in photodetector technology using various forms and chemical compositions of halide perovskite single crystals,including single crystal bulks and single crystal thin films.Firstly,we systematically review the preparation and optimization progress of halide perovskite single crystals,with a focus on the latest progress in triple cations hybrid perovskite single crystals.After that,a comprehensive introduction was given to the research status of various types of photodetectors based on perovskite single crystals.Finally,the current challenges and future development prospects in the research field of halide perovskite single crystal photodetector are summarized in order to promote rapid progress and development in this field.