材料科学
钙钛矿(结构)
铁电性
功勋
卤化物
光电子学
极化(电化学)
电压
探测器
灵敏度(控制系统)
纳米技术
X射线探测器
光学
电介质
电气工程
物理
无机化学
电子工程
化学
结晶学
工程类
物理化学
作者
Chengmin Ji,Sasa Wang,Yaxing Wang,Huaixi Chen,Lina Li,Yan Sui,Shuao Wang
标识
DOI:10.1002/adfm.201905529
摘要
Abstract X‐ray detectors with high sensitivity are of great significance in both civil and military fields. Over the past decades, great efforts have been made to improve the sensitivity in conventional inorganic materials, but mainly at the cost of increasing the energy consumption with a quite high operating voltage. Developing photosensitive ferroelectrics directly as detector materials may be a conceptually new strategy in view of the strong ferroelectric spontaneous polarization ( P s ) that assists photoinduced carriers separation and transport. A high‐performance X‐ray detector in 2D hybrid halide perovskite ferroelectric (C 4 H 9 NH 3 ) 2 (C 2 H 5 NH 3 ) 2 Pb 3 Br 10 ( BA 2 EA 2 Pb 3 Br 10 ) ( P s = 5 µC cm −2 ) is fabricated and exhibits an ultrahigh X‐ray sensitivity up to 6.8 × 10 3 µC Gy air −1 cm −2 even at a relatively low operating voltage, which is over 300‐fold larger than that of state‐of‐the‐art α‐Se X‐ray detectors. Such a brilliant figure‐of‐merit is largely attributed to the superior mobility–lifetime products associated with the strong ferroelectric polarization of BA 2 EA 2 Pb 3 Br 10 . As pioneering work, these findings inform the exploration of hybrid halide perovskite ferroelectrics toward high‐performance photoelectronic devices.
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