Polycrystalline Perovskite X-ray Detectors

Logan J. Forth, H. Gibbard, Stephanie Biddlecombe, Isabel Braddock, C. Crean, J. C. Khong, Mingqing Wang, R. Speller, K. Choy, P. Sellin, R. Moss
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Abstract

Metal-halide perovskite materials have begun to attract much attention recently for their potential use in radiation detection applications. This interest is mainly due to their favourable semi-conductive properties, high electron density, ease of manufacture and relatively low cost compared to popular detector materials. In this paper we investigate inorganic caesium lead bromide (CsPbBr3). Polycrystalline powder samples were produced by solution growth and simple ‘sandwich’ devices were fabricated. The powder was manually ground and then pressed to form pellets of a few mm thickness. Gold planar electrodes were deposited on the top and bottom perovskite surfaces by evaporation and were connected to an external circuit. We have made comparative measurements of the photoluminescence (PL), dark current and temporal radiation response. The PL measurements showed stable emissions centred at 525 nm for CsPbBr3’ which is typical of these materials and within a useful range for this application. A CsPbBr3 device was exposed to X-rays and demonstrates a good increase in photocurrent over the dark current under both positive and negative bias with a sensitivity of 33.8 µCGy−1aircm−2and the temporal response was determined to be ~40 ms by measuring the photocurrent decay after X-ray illumination.
多晶钙钛矿x射线探测器
近年来,金属卤化物钙钛矿材料因其在辐射探测中的潜在应用而备受关注。这种兴趣主要是由于其良好的半导电性能,高电子密度,易于制造和相对较低的成本与流行的探测器材料相比。本文研究了无机溴化铯铅(CsPbBr3)。通过溶液生长制备了多晶粉末样品,并制作了简单的“三明治”装置。粉末被人工磨碎,然后压成几毫米厚的颗粒。金平面电极通过蒸发沉积在钙钛矿的上下表面,并与外部电路相连。我们进行了光致发光(PL)、暗电流和时间辐射响应的对比测量。PL测量显示CsPbBr3 '的稳定发射集中在525 nm,这是这些材料的典型特征,并且在该应用的有用范围内。将CsPbBr3器件暴露在x射线下,在正偏置和负偏置下,光电流都比暗电流有较好的增加,灵敏度为33.8µCGy−1aircm−2,通过测量x射线照射后的光电流衰减,确定了时间响应为~40 ms。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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