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Exploring Lead‐Free Hybrid Double Perovskite Crystals of (BA) 2 CsAgBiBr 7 with Large Mobility‐Lifetime Product toward X‐Ray Detection
Author(s) -
Xu Zhiyun,
Liu Xin,
Li Yaobin,
Liu Xitao,
Yang Tao,
Ji Chengmin,
Han Shiguo,
Xu Yadong,
Luo Junhua,
Sun Zhihua
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201909815
Subject(s) - halide , materials science , figure of merit , wafer , optoelectronics , perovskite (structure) , electron mobility , crystallography , chemistry , inorganic chemistry
Halide double perovskites have recently bloomed as the green candidates for optoelectronic applications, such as X‐ray detection. Despite great efforts, the exploration of promising organic–inorganic hybrid double perovskites toward X‐ray detection remains unsuccessful. Now, single crystals of the lead‐free hybrid double perovskite, (BA) 2 CsAgBiBr 7 (BA + is n‐butylammonium), featuring the unique 2D multilayered quantum‐confined motif, enable quite large μτ (mobility‐lifetime) product up to 1.21×10 −3 cm 2 V −1 . This figure‐of‐merit realized in 2D hybrid double perovskites is unprecedented and comparable with that of CH 3 NH 3 PbI 3 wafers. (BA) 2 CsAgBiBr 7 crystals also exhibit other intriguing attributes for X‐ray detection, including high bulk resistivity, low density of defects and traps, and large X‐ray attenuation coefficient. Consequently, a vertical‐structure crystal device under X‐ray source yields a superior sensitivity of 4.2 μC Gy air −1 cm −2 .