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Rigid Amine‐Induced Pseudo‐3 D Lead‐Free Bismuth Halide Perovskite with an Improved Band Edge for Visible‐Light Absorption
Author(s) -
Wang Yanyan,
Wen Rui,
Liu Yuanyuan,
Bi LeYu,
Yang Mingming,
Sun Huaming,
Zheng YanZhen,
Zhang Guofang,
Gao Ziwei
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202000282
Subject(s) - perovskite (structure) , halide , band gap , bismuth , chemistry , absorption (acoustics) , absorption edge , materials science , hypsochromic shift , absorption band , electronic band structure , optoelectronics , photochemistry , inorganic chemistry , crystallography , optics , organic chemistry , condensed matter physics , physics , composite material , fluorescence
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)BiI 5 (MV 2+ =methyl viologen). The pseudo‐3 D metal‐halogen perovskite‐like structure is constructed by connecting [BiI 5 ] 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)BiI 5 has a narrow band gap of 1.48 eV and a better photoresponse than (MV)BiCl 5 with a 1 D structure. (MV)BiI 5 is the first Bi‐based perovskite compound with a band gap energy comparable with (CH 3 NH 3 )PbI 3 , 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 APbX 3 absorbers.