Detection of X-ray photons by solution-processed organic-inorganic perovskites.
Detection of X-ray photons by solution-processed organic-inorganic perovskites.
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DOI：
10.1038/nphoton.2015.82
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发表时间：
2015-07
期刊：
影响因子：
35
通讯作者：
Heiss W
中科院分区：
文献类型：
--
作者：
Yakunin S;Sytnyk M;Kriegner D;Shrestha S;Richter M;Matt GJ;Azimi H;Brabec CJ;Stangl J;Kovalenko MV;Heiss W
基于常规固态半导体的集成固态X射线光子探测器的发展，使得血管造影术和计算机断层扫描等实时医疗诊断工具从基于照相底片的射线照相术得以演进。最近，对于在可见光和近红外光谱区域工作的光电器件，溶液处理的有机和无机半导体也引起了极大的关注。在此我们展示了利用这种廉价半导体通过直接的光子 - 电流转换来灵敏检测X射线光子的可能性。特别是甲基铵碘化铅钙钛矿（CH₃NH₃PbI₃）由于含有重的Pb和I原子，为X射线提供了快速光响应和高吸收截面的令人瞩目的组合。介绍了溶液处理的光电二极管以及光电导体，它们展现出高的X射线灵敏度值（高达25 µC mGy空气⁻¹ cm⁻³）和响应度（1.9×10⁴个载流子/光子），与当前固态技术所获得的值相当。
The evolution of real-time medical diagnostic tools such as angiography and computer tomography from radiography based on photographic plates was enabled by the development of integrated solid-state X-ray photon detectors, based on conventional solid-state semiconductors. Recently, for optoelectronic devices operating in the visible and near infrared spectral regions, solution-processed organic and inorganic semiconductors have also attracted immense attention. Here we demonstrate a possibility to use such inexpensive semiconductors for sensitive detection of X-ray photons by direct photon-to-current conversion. In particular, methylammonium lead iodide perovskite (CH3NH3PbI3) offers a compelling combination of fast photoresponse and a high absorption cross-section for X-rays, owing to the heavy Pb and I atoms. Solution processed photodiodes as well as photoconductors are presented, exhibiting high values of X-ray sensitivity (up to 25 µC mGyair-1 cm-3) and responsivity (1.9×104 carriers/photon), which are commensurate with those obtained by the current solid-state technology.