Motivated by the success of methylammonium lead iodide,substantial efforts have been made to search for moisture-and air-stable metal halide perovskites(MHPs)for various optoelectronic applications.Lowering the struct...Motivated by the success of methylammonium lead iodide,substantial efforts have been made to search for moisture-and air-stable metal halide perovskites(MHPs)for various optoelectronic applications.Lowering the structural dimensionality in 2D and quasi-2D MHPs greatly increases the stability,but the simultaneously lowered electronic dimensionality leads to less efficient and large anisotropic charge carrier separation and transport.Herein,we report the construction and characterization of three 3D MHP analogs APb_(2)I_(6)(A=linear alkyl-diammonium cation)displaying balanced high stability and isotropic photoresponse.Single-crystal-based devices exhibit on/off ratios of photocurrent higher than 1.0×10^(3) in all three crystallographic directions and ultra-long device stability(>12 months)at 40%relative humidity.The enhanced stability and quasi-isotropic photoresponse are ascribed to the specific choice of the cations and the genuine 3D electronic dimensionality.This type of 3D MPH analog is expected to be a promising candidate for fabricating high-performance optoelectronic devices.展开更多
基金financially supported by the National Natural Science Foundation of China(Grants 21991144 and 21875035)。
文摘Motivated by the success of methylammonium lead iodide,substantial efforts have been made to search for moisture-and air-stable metal halide perovskites(MHPs)for various optoelectronic applications.Lowering the structural dimensionality in 2D and quasi-2D MHPs greatly increases the stability,but the simultaneously lowered electronic dimensionality leads to less efficient and large anisotropic charge carrier separation and transport.Herein,we report the construction and characterization of three 3D MHP analogs APb_(2)I_(6)(A=linear alkyl-diammonium cation)displaying balanced high stability and isotropic photoresponse.Single-crystal-based devices exhibit on/off ratios of photocurrent higher than 1.0×10^(3) in all three crystallographic directions and ultra-long device stability(>12 months)at 40%relative humidity.The enhanced stability and quasi-isotropic photoresponse are ascribed to the specific choice of the cations and the genuine 3D electronic dimensionality.This type of 3D MPH analog is expected to be a promising candidate for fabricating high-performance optoelectronic devices.
