Tuning Photodetection Band of MAPbX3(X=Cl/Br/I) Perovskite Single Crystals by Sub-nano Carbon Dot Doping

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 MAPbX 3 (MA=methylammonium, X=Cl/Br/I) perovskite single crystals with sub-nano carbon dots (MAPbX 3 -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 MAPbX 3 -C single crystals resulted in the special responsivity spectrum features.