钝化
材料科学
离子
分析化学(期刊)
纳米技术
化学
色谱法
有机化学
图层(电子)
作者
Yilong Song,Liqi Li,Weihui Bi,Mingwei Hao,Yifei Kang,Anran Wang,Zisheng Wang,Hanming Li,Xiaohui Li,Yanjun Fang,Deren Yang,Qingfeng Dong
出处
期刊:Research
[AAAS00]
日期:2020-01-01
卷期号:2020
被引量:59
标识
DOI:10.34133/2020/5958243
摘要
Organic-inorganic halide perovskites (OIHPs) are recognized as the promising next-generation X-ray detection materials. However, the device performance is largely limited by the ion migration issue of OIHPs. Here, we reported a simple atomistic surface passivation strategy with methylammonium iodide (MAI) to remarkably increase the ion migration activation energy of CH 3 NH 3 PbI 3 single crystals. The amount of MAI deposited on the crystal surface is finely regulated by a self-assemble process to effectively suppress the metallic lead defects, while not introducing extra mobile ions, which results in significantly improved dark current stability of the coplanar-structure devices under a large electric field of 100 V mm -1 . The X-ray detectors hence exhibit a record-high sensitivity above 700,000 μ C Gy air ‐ 1 cm ‐2 under continuum X-ray irradiation with energy up to 50 keV, which enables an ultralow X-ray detection limit down to 1.5 nGy air s -1 . Our findings will allow for the dramatically reduced X-ray exposure of human bodies in medical imaging applications.
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