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Incorporating Guanidinium as Perovskitizer‐Cation of Two‐Dimensional Metal Halide for Crystal‐Array Photodetectors
Author(s) -
Pan Xiong,
Chen Huaixi,
Lu Lei,
Han Shiguo,
Ma Yu,
Wang Jiaqi,
Guo Wuqian,
Xu Haojie,
Luo Junhua,
Sun Zhihua
Publication year - 2021
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.202100425
Subject(s) - photodetection , responsivity , perovskite (structure) , photodetector , halide , materials science , photoelectric effect , density functional theory , crystal (programming language) , crystal structure , metal , band gap , semiconductor , crystallography , metal halides , optoelectronics , chemistry , inorganic chemistry , computational chemistry , computer science , programming language , metallurgy
Two‐dimensional (2D) hybrid perovskites are recently emerging as a potential family of semiconductors for versatile optoelectronic applications. Currently, the “perovskitizer” moieties are rigidly limited to small‐size cations, while few 2D metal‐halides containing guanidinium cations inside perovskite cages have been studied for photodetection. Herein, we present a new 2D hybrid perovskite, ( i ‐BA) 2 (G)Pb 2 I 7 (where G is guanidinium and i ‐BA is isobutylammonium), which adopts a bilayered framework of {GPb 2 I 7 }. Single‐crystal structure analyses disclose that G cations act as the perovskitizer, confined in the flexible perovskite cages formed by the distorted PbI 6 octahedra. Such inorganic sheets are crucial to the superior semiconducting properties and optical bandgap, as verified by the density functional theory calculation. Furthermore, its planar crystal‐array photodetector shows fascinating photoelectric performance, including a quite low dark current (∼4.6×10 −11 A), a large current switching ratio (∼1.0×10 3 ), and a notable photo‐responsivity of ∼0.72 A W −1 , suggesting great potential of ( i ‐BA) 2 (G)Pb 2 I 7 for photodetection.