Park Beomjun, Ko Juyoung, Byun Jangwon, Pandey Sandeep, Park Byungdo, Kim Jeongho, Lee Man-Jong
Department of Chemistry, Konkuk University, Seoul 05029, Republic of Korea.
Advanced Crystal Material/Device Research Center, Konkuk University, Seoul 05029, Republic of Korea.
Nanomaterials (Basel). 2023 Jul 25;13(15):2157. doi: 10.3390/nano13152157.
Perovskite single crystals are actively studied as X-ray detection materials with enhanced sensitivity. Moreover, the feasibility of using perovskites for self-powered devices such as photodetectors, UV detectors, and X-ray detectors can significantly expand their application range. In this work, the charge carrier transport and photocurrent properties of MAPbBr single crystals (MSCs) are improved by the mechanochemical surface treatment using glycerin combined with an additional electrode design that forms an ohmic contact. The sensitivity of MSC-based detectors and pulse shape generated by X-rays are enhanced at various bias voltages. The synthesized MSC detectors generate direction-dependent photocurrents, which indicate the presence of a polarization-induced internal electric field. In addition, photocurrent signals are produced by X-rays with energies greater than 1 MeV under a zero-bias voltage. This work demonstrates a high application potential of perovskites as self-powered detectors for X-rays with energies exceeding 1 MeV.
钙钛矿单晶作为具有增强灵敏度的X射线检测材料正受到积极研究。此外，将钙钛矿用于光探测器、紫外线探测器和X射线探测器等自供电器件的可行性可以显著扩大其应用范围。在这项工作中，通过使用甘油的机械化学表面处理结合形成欧姆接触的附加电极设计，改善了MAPbBr单晶（MSCs）的电荷载流子传输和光电流特性。在各种偏置电压下，基于MSC的探测器的灵敏度和由X射线产生的脉冲形状都得到了增强。合成的MSC探测器产生方向依赖性光电流，这表明存在极化诱导的内部电场。此外，在零偏置电压下，能量大于1 MeV的X射线会产生光电流信号。这项工作证明了钙钛矿作为能量超过1 MeV的X射线自供电探测器具有很高的应用潜力。
