Phase Transition and Band Gap Regulation by Halogen Substituents on the Organic Cation in Organic–Inorganic Hybrid Perovskite Semiconductors
作者:Ying‐Jie Cao、Lin Zhou、Lei He、Ping‐Ping Shi、Qiong Ye、Da‐Wei Fu
DOI:10.1002/chem.202001266
日期:2020.11.6
hybrid materials have received widespread attention. In particular, hybrid lead halide perovskite‐type semiconductors are very attractive owing to their great flexibility in band gap engineering. Here, by using precise molecular modifications, three one‐dimensional perovskite‐type semiconductor materials are designed and obtained: [Me3PCH2X][PbBr3] (X=H, F, and Cl for compounds 1, 2, and 3, respectively)
在过去的十年中,混合材料受到了广泛的关注。尤其是,混合卤化钙钛矿型半导体因其在带隙工程中的巨大灵活性而极具吸引力。这里,通过使用精确的分子修饰,三个一维钙钛矿型半导体材料被设计和获得:我3 PCH 2 X] [PbBr 3 ](X = H,F,和Cl为化合物 1,2,和3, 分别)。在[Me 4 P] +中引入较重的卤素原子(F或Cl)增加了阳离子翻滚运动所需的势能垒,从而实现了相变温度从低温(192 K)到室温(285 K)和高温(402.3 K)的转变。此外,沿着H→F→Cl系列,光学带隙显示出3.176 eV,3.215 eV和3.376 eV的扩展趋势,这归因于结构畸变的形成。