Perovskite single crystals are prominent semiconductor materials due to their high carrier mobility, long carrier diffusion length, and large absorption coefficient. They can be used as optoelectronic functional materials for narrowband or broadband photodetectors. In this report, the photodetection band tunability was achieved by doping MAPbX₃(MA=methylammonium, X=Cl/Br/I) perovskite single crystals with sub-nano carbon dots (MAPbX₃-C). The sub-nano size and good dispersibility of the carbon dots ensured controllable doping. The absorption of the sub-nano carbon dots and trap states in the MAPbX₃-C single crystals resulted in the special responsivity spectrum features.

钙钛矿单晶由于其高载流子迁移率、长载流子扩散长度和大吸收系数而成为突出的半导体材料。它们可用作窄带或宽带光电探测器的光电功能材料。在这份报告中，光电探测带可调性是通过掺杂具有亚纳米碳点 (MAPbX _{3 -C) 的 MAPbX 3} (MA=甲基铵，X=Cl/Br/I) 钙钛矿单晶实现的。碳点的亚纳米尺寸和良好的分散性确保了可控掺杂。_{MAPbX 3} -C单晶中亚纳米碳点和陷阱态的吸收导致了特殊的响应光谱特征。