Abstract
Inorganic Cs2SnI6 perovskite has exhibited substantial potential for light harvesting due to its exceptional optoelec-tronic properties and remarkable stability in ambient conditions.The charge transport characteristics within perovskite films are subject to modulation by various factors,including crystalline orientation,morphology,and crystalline quality.Achieving preferred crystalline orientation and film morphology via a solution-based process is challenging for Cs2SnI6 films.In this work,we employed thiourea as an additive to optimize crystal orientation,enhance film morphology,promote crystallization,and achieve phase purity.Thiourea lowers the surface energy of the(222)plane along the<111>direction,confirmed by x-ray diffraction,x-ray photoelectron spectroscopy,ultraviolet photoelectron spectroscopy studies,and den-sity functional theory calculations.Varying thiourea concentration enables a bandgap tuning of Cs2SnI6 from 1.52 eV to 1.07 eV.This approach provides a novel method for utilizing Cs2SnI6 films in high-performance optoelectronic devices.
基金项目
National Natural Science Foundation of China(12174275)
National Natural Science Foundation of China(62174113)
National Natural Science Foundation of China(61874139)
National Natural Science Foundation of China(61904201)
National Natural Science Foundation of China(11875088)
Guangdong Basic and Applied Basic Research Foundation(2019B1515120057)
NETL
NSTL
万方数据