Rigid Amine-Induced Pseudo-3 D Lead-Free Bismuth Halide Perovskite with an Improved Band Edge for Visible-Light Absorption
Rigid Amine-Induced Pseudo-3 D Lead-Free Bismuth Halide Perovskite with an Improved Band Edge for Visible-Light Absorption
复制标题
刚性胺诱导的伪 3D 无铅卤化铋钙钛矿，具有改进的可见光吸收带边缘
DOI：
10.1002/cssc.202000282
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发表时间：
2020
期刊：
影响因子：
8.4
通讯作者：
Gao Ziwei
中科院分区：
文献类型：
--
作者：
Wang Yanyan;Wen Rui;Liu Yuanyuan;Bi Le-Yu;Yang Mingming;Sun Huaming;Zheng Yan-Zhen;Zhang Guofang;Gao Ziwei
由于铋有机金属卤化物钙钛矿的毒性较低，最近被研究作为铅钙钛矿太阳能电池吸收剂的潜在替代品。然而，带隙的缩小仍然是其实际应用的关键挑战。所有已知的铋基钙钛矿都具有较大的带隙，因此可见光吸收较弱。这项研究涉及一种新型、无铅、伪 3D 钙钛矿光电材料，(MV)BiI5(MV2+=甲基紫精)。伪3 D金属卤素钙钛矿结构是通过I⋅⋅⋅I接触连接[BiI5]2+单元构建的。 MV作为刚性有机胺，位于每个平行六面体的中心，以平衡电荷并稳定结构。 (MV)BiI5具有1.48 eV的窄带隙，并且比具有1 D结构的(MV)BiCl5具有更好的光响应性。 (MV)BiI5是第一个带隙能量与(CH3NH3)PbI3相当的Bi基钙钛矿化合物，这对于光电应用来说是令人鼓舞的。这项研究将为设计性能与 APbX3 吸收剂相当的伪 3D Bi 基钙钛矿开辟一条潜在途径。
Bismuth organometal halide perovskites have recently been investigated as potential substitutes for lead perovskite solar‐cell absorbers because of their lower toxicity. However, the narrowing of the band gap remains a crucial challenge for their practical application. All known Bi‐based perovskites have large band gaps, thereby affording weak visible‐light absorption. This study concerns a novel, lead‐free, pseudo‐3 D perovskite optoelectronic material, (MV)BiI5(MV2+=methyl viologen). The pseudo‐3 D metal‐halogen perovskite‐like structure is constructed by connecting [BiI5]2+units via I⋅⋅⋅I contacts. MV, as a rigid organic amine, is located at the center of each parallelepiped to balance the charge and stabilize the structure. (MV)BiI5has a narrow band gap of 1.48 eV and a better photoresponse than (MV)BiCl5with a 1 D structure. (MV)BiI5is the first Bi‐based perovskite compound with a band gap energy comparable with (CH3NH3)PbI3, which is encouraging for optoelectronic applications. This research will open a potential pathway for the design of pseudo‐3 D Bi‐based perovskites with performances comparable with APbX3absorbers.