Affiliation:
1. School of Physics and Electronic Science Engineering Research Center of Nanophotonics and Advanced Instrument Ministry of Education East China Normal University Shanghai 200062 China
Abstract
AbstractHere robust Pb‐S covalency is successfully incorporated into CsPbI3 heterojunction by introducing a new zwitterionic organosulfide‐halide perovskite on top of CsPbI3. Cysteamine (CYS: +NH3(CH2)2S−) will react with PbCl2 and form a new 3D perovskite with much shallower fermi level on CsPbI3 surface, constructing an efficient CsPbI3/[CYS][PbCl2] heterojunction. As a result, interfacial energy loss can be significantly inhibited and device open‐circuit voltage (Voc) is increased to over 1.20 V with champion efficiency of 20.38% in inverted CsPbI3 perovskite solar cells (PSCs). Besides, the intrinsic moisture and phase stability of [CYS][PbCl2] perovskite will effectively stabilize the CsPbI3 beneath owing to its robust Pb‐S covalency. PSCs with [CYS][PbCl2] exhibit significantly improved stability, whether in moist air or under continuous maximum power point (MPP) tracking.
Funder
National Basic Research Program of China
Fundamental Research Funds for the Central Universities
National Natural Science Foundation of China
National Science Fund for Distinguished Young Scholars
Natural Science Foundation of Shanghai Municipality