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Double free:A Promising Route toward Moisture-Stable Hypotoxic Hybrid Perovskites

CCS Chemistry 2022年第4期4卷 1273-1283页

作者： Guang-Ning Liu Ruo-Yu Zhao Rang-Dong Xu Cuncheng Li Guo-Cong Guo School of Chemistry and Chemical Engineering University of JinanJinanShandong 250022 State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian 350002

The moisture instability and toxicity of lead have hindered the development of lead organometal halide perovskites(Pb-OHPs).Similar to Pb-OHPs,OHPs based on Pb-free elements,including Group VA metals Bi and Sb(denoted as M),exhibit optoelectronic properties due to their isoelectronic configuration and close chemistry of the lone-pair ns^(2) ***,M-OHPs are mostly based on hydrophilic protonated organic countercations and possess low structural dimensionalities,which affect the moisture stability and disrupt continuous carrier transport,***,we demonstrate a“double-free”strategy to realize the rational synthesis of moisture-stable hypotoxic hybrid perovskites.A hydrogen-bond-free alkylated countercation was assembled with Pb-free OHP bearing an extended structure in one *** a proof of concept,two double-free M-OHPs are synthesized,which show greatly improved moisture and photostability compared to their corresponding hydrogen-bond OHPs and the extensively studied MA_(3)M_(2)X_(9)(MA=CH_(3)NH_(3)^(+)).The photoconduction behaviors of both double-free OHPs display short rise and decay recovery time and exhibit excellent photocurrent ***,(1-methyl-4-phenylpyridin-1-ium)BiI_(4)(Me4ppi-BiI_(4))displays a comparable switching on/off ratio with MA_(3)Bi_(2)I_(9),and can endure 75% relative humidity(RH)for at least 243 *** photophysical property measurements and theoretical calculations show that this remarkable photoconversion performance results from the relatively low exciton binding energy and greatly improved carrier mobility and concentration.

关键词： bismuth halide crystal structure hydrogen-bond-free inorganic-organic hybrid photoconductor

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