Sensitive X-ray detectors made of methylammonium lead tribromide perovskite single crystals
Sensitive X-ray detectors made of methylammonium lead tribromide perovskite single crystals
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DOI：
10.1038/nphoton.2016.41
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发表时间：
2016-05-01
期刊：
影响因子：
35
通讯作者：
Huang, Jinsong
中科院分区：
文献类型：
--
作者：
Wei, Haotong;Fang, Yanjun;Huang, Jinsong
混合钙钛矿单晶的大迁移率和载流子寿命以及Pb、I和Br的高原子序数使它们成为X射线和伽马射线探测的理想选择。在这里，我们报告了一个敏感的X射线探测器制成的甲基铵溴化铅钙钛矿单晶。通过减少体缺陷和钝化表面陷阱，实现了1.2 × 10（-2）cm（2）V（-1）的高迁移率寿命积和64 cm s（-1）的极小表面电荷复合速度。厚度为2-3 mm的单晶器件在连续X射线能量高达50 keV的辐照下，在接近零偏压下显示出16.4%的探测效率。最低可探测的X射线剂量率为0.5 μ戈伊（空气）s（-1），灵敏度为80 μ C戈伊（空气）（-1）cm（-2），比α-Se X射线探测器所达到的灵敏度高四倍。这允许对于许多医疗和安全检查应用减少施加到人体的辐射剂量。
The large mobilities and carrier lifetimes of hybrid perovskite single crystals and the high atomic numbers of Pb, I and Br make them ideal for X-ray and gamma-ray detection. Here, we report a sensitive X-ray detector made of methylammonium lead bromide perovskite single crystals. A record-high mobility-lifetime product of 1.2 x 10(-2) cm(2) V-1 and an extremely small surface charge recombination velocity of 64 cm s(-1) are realized by reducing the bulk defects and passivating surface traps. Single-crystal devices with a thickness of 2-3 mm show 16.4% detection efficiency at near zero bias under irradiation with continuum X-ray energy up to 50 keV. The lowest detectable X-ray dose rate is 0.5 mu Gy(air) s(-1) with a sensitivity of 80 mu C Gy(air)(-1) cm(-2), which is four times higher than the sensitivity achieved with alpha-Se X-ray detectors. This allows the radiation dose applied to a human body to be reduced for many medical and security check applications.