摘要
The controversy over the origin of the broadband emission peaks of the double perovskite Cs2AgInCl6 and its family series is a major issue in the academic world today,affecting their application in practical devices.Through theoretical calculations and femtosecond transient absorption spectroscopy,it has been confirmed that broadband emission comes from radiative transitions in intrinsic energy gaps in organic inorganic hybrid systems.Furthermore,the photodetectors based on double perovskite nanocrystals have dual-band photoresponsivity.Finally,the visible-light-driven photodetectors have higher responsivity and detectability,indicating that visiblelight-driven nanocrystal-dye-based optoelectronic devices have significant advantage.In particular,this is the first photodetector of double perovskites driven by visible light.Our study shows that visible-lightdriven double perovskite nanocrystal composite systems can provide a revolutionary solution for new photovoltaic energy sources.
基金
the National Natural Science Foundation of China(grant nos.21873068,21573229,and 21422309)
G.J.Z.also gratefully acknowledges the financial support from the Double First-Rate and Peiyang Scholar Projects(Tianjin University)
the Open Research Funds of State Key Laboratory of Bioelectronics(Southeast University).
