维数之咒
钙钛矿(结构)
材料科学
卤化物
探测器
光伏系统
单层
光电子学
铁电性
纳米技术
光学
物理
计算机科学
结晶学
化学
无机化学
电介质
电气工程
工程类
机器学习
作者
Chengmin Ji,Yezhan Li,Xitao Liu,Yaxing Wang,Tingting Zhu,Qin Chen,Lina Li,Shuao Wang,Junhua Luo
标识
DOI:10.1002/anie.202108145
摘要
Abstract Halide hybrid perovskites are attracting considerable attention as highly promising candidates for directly sensing X‐ray radiation, but it is challenging to realize passive X‐ray detection without an external power supply. However, the bulk photovoltaic effect (BPVE) in ferroelectrics promotes the independent separation of photoexcited carriers. Herein, by dimensionality reconstruction of a pure‐two‐dimensional (P‐2D) monolayered perovskite (CH 3 OC 3 H 9 N) 2 PbBr 4 , we obtained a quasi‐two‐dimensional (Q‐2D) ferroelectric (CH 3 OC 3 H 9 N) 2 CsPb 2 Br 7 . Converting P‐2D into Q‐2D perovskite stimulates a significant BPVE associated with robust ferroelectricity, as well as an enhanced mobility lifetime product. These features show the potential of the first passive X‐ray detector based on ferroelectrics with an impressive sensitivity up to 410 μC Gy −1 cm −2 at zero bias, which is even superior to the value of the state‐of‐the‐art α‐Se detector operated at relatively high bias.
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