High-performance 110 kVp hard x-ray detector based on all-crystalline-surface passivated perovskite single crystals  

作　　者：Juyoung Ko Beomjun Park Jangwon Byun Sandeep Pandey Ajin Jo Joo-Hong Lee Wonho Lee Jin-Wook Lee Nam-Gyu Park Man-Jong Lee 

机构地区：[1]Department of Chemistry,Konkuk University,Seoul,Republic of Korea [2]Advanced Crystal Material/Device Research Center,Konkuk University,Seoul,Republic of Korea [3]Health Science Research Center,Korea University,Seoul,Republic of Korea [4]Department of Nano Engineering and Department of Nano Science and Technology,SKKU Advanced Institute of Nanotechnology(SAINT),Sungkyunkwan University,Suwon,Republic of Korea [5]SKKU Institute of Energy Science&Technology(SIEST),Sungkyunkwan University,Suwon,Republic of Korea [6]Department of Health and Environmental Science,Korea University,Seoul,Republic of Korea [7]School of Chemical Engineering,Center for Antibonding Regulated Crystals,Sungkyunkwan University,Suwon,Republic of Korea

出　　处：《InfoMat》2024年第8期97-110,共14页信息材料（英文）

基　　金：Agency for Defense Development,Grant/Award Number:UI220006TD;Defense Acquisition Program Administration(DAPA),Grant/Award Number:912765601;Korea Institute of Energy Technology Evaluation and Planning,Grant/Award Number:RS-2023-00237035。

摘　　要：Halide perovskite single crystals(SCs)have attracted much attention for their application in high-performance x-ray detectors owing to their desirable properties,including low defect density,high mobility–lifetime product(μτ),and long carrier diffusion length.However,suppressing the inherent defects in perovskites and overcoming the ion migration primarily caused by these defects remains a challenge.This study proposes a facile process for dipping Cs0.05FA0.9MA0.05PbI3 SCs synthesized by a solution-based inverse temperature crystallization method into a 2-phenylethylammonium iodide(PEAI)solution to reduce the number of defects,inhibit ion migration,and increase x-ray sensitivity.Compared to conventional spin coating,this simple dipping process forms a two-dimensional PEA2PbI4 layer on all SC surfaces without further treatment,effectively passivating all surfaces of the inherently defective SCs and minimizing ion migration.As a result,the PEAI-treated perovskite SC-based x-ray detector achieves a record x-ray sensitivity of 1.3×10^(5)μC Gyair^(-1) cm^(-2) with a bias voltage of 30 V at realistic clinical dose rates of 1–5 mGy s^(-1)(peak potential of 110 kVp),which is 6 times more sensitive than an untreated SC-based detector and 3 orders of magnitude more sensitive than a commercialα-Se-based detector.Furthermore,the PEAI-treatedperovskite SC-based x-ray detector exhibits a low detection limit(73 nGy s^(-1)),improved x-ray response,and clear x-ray images by a scanning method,highlighting the effectiveness of the PEAI dipping approach for fabricating next-generation x-ray detectors.

关 键 词：2D PEA2PbI4 layers clinical dose rates perovskite single crystals phenethylammonium iodide(PEAI) surface passivation x-ray sensitivity 

分 类 号：TN21[电子电信—物理电子学]