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

InfoMat 2024年第8期6卷 97-110页

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 Department of Chemistry Konkuk UniversitySeoulRepublic of Korea Advanced Crystal Material/Device Research Center Konkuk UniversitySeoulRepublic of Korea Health Science Research Center Korea UniversitySeoulRepublic of Korea Department of Nano Engineering and Department of Nano Science and Technology SKKU Advanced Institute of Nanotechnology(SAINT)Sungkyunkwan UniversitySuwonRepublic of Korea SKKU Institute of Energy Science&Technology(SIEST) Sungkyunkwan UniversitySuwonRepublic of Korea Department of Health and Environmental Science Korea UniversitySeoulRepublic of Korea School of Chemical Engineering Center for Antibonding Regulated CrystalsSungkyunkwan UniversitySuwonRepublic of Korea

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 ***,suppressing the inherent defects in perovskites and overcoming the ion migration primarily caused by these defects remains a *** 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 *** 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 *** 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 ***,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

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