High-Performance Planar-Type Photodetector on (100) Facet of MAPbI ₃ Single Crystal

Abstract

Recently, the discovery of organometallic halide perovskites provides promising routes for fabricating optoelectronic devices with low cost and high performance. Previous experimental studies of MAPbI ₃ optoelectronic devices, such as photodetectors and solar cells, are normally based on polycrystalline films. In this work, a high-performance planar-type photodetector fabricated on the (100) facet of a MAPbI ₃ single crystal is proposed. We demonstrate that MAPbI ₃ photodetector based on single crystal can perform much better than that on polycrystalline-film counterpart. The low trap density of MAPbI ₃ single crystal accounts for the higher carrier mobility and longer carrier diffusion length, resulted in a significant performance increasement of MAPbI ₃ photodetector. Compared with similar planar-type photodetectors based on MAPbI ₃ polycrystalline film, our MAPbI ₃ single crystal photodetector showed excellent performance with good stability and durability, broader response spectrum to near-infrared region, about 10 ² times higher responsivity and EQE, and approximately 10 ³ times faster response speed. These results may pave the way for exploiting high-performance perovskites photodetectors based on single crystal.