卤化物
钙钛矿(结构)
化学
电导率
价(化学)
分子
氧化还原
轨道能级差
兴奋剂
载流子
无机化学
化学物理
作者
Roc Matheu,Feng Ke,Aaron Breidenbach,Nathan Wolf,Young Lee,Zhenxian Liu,Linn Leppert,Yu Lin,Hemamala Karunadasa
标识
DOI:10.1002/anie.202202911
摘要
As halide perovskites and their derivatives are being developed for numerous optoelectronic applications, controlling their electronic doping remains a fundamental challenge. Herein, we describe a novel strategy of using redox-active organic molecules as stoichiometric electron acceptors. The cavities in the new expanded perovskite analogs (dmpz)[Sn2 X6 ], (X=Br- (1Br) and I- (1I)) are occupied by dmpz2+ (N,N'-dimethylpyrazinium), with the LUMOs lying ca. 1 eV above the valence band maximum (VBM). Compressing the metal-halide framework drives up the VBM in 1I relative to the dmpz LUMO. The electronic conductivity increases by a factor of 105 with pressure, reaching 50(17) S cm-1 at 60 GPa, exceeding the high-pressure conductivities of most halide perovskites. This conductivity enhancement is attributed to an increased hole density created by dmpz2+ reduction. This work elevates the role of organic cations in 3D metal-halides, from templating the structure to serving as charge reservoirs for tuning the carrier concentration.
科研通智能强力驱动
Strongly Powered by AbleSci AI