Wang Xin, Xu Yubing, Pan Yuzhu, Chai Shunjie, Wu Jie, Zhao Jingda, Li Yuwei, Zhao Zhiwei, Li Qing, Wu Jun, Chen Jing, Bae Byung Seong, Zhou Jianming, Zhu Ying, Lei Wei, Xu Xiaobao
School of Electronic Science and Engineering, Southeast University, Nanjing 210000, China.
Department of Electronics &Display Engineering, Hoseo University, Hoseo Ro 79, Asan City, Chungnam 31499, Republic of Korea.
ACS Appl Mater Interfaces. 2024 Mar 6;16(9):12106-12114. doi: 10.1021/acsami.4c00432. Epub 2024 Feb 27.
Solution-processed lead halide perovskite single crystals (LHPSCs) are believed to have great potential in gamma-ray spectroscopy. However, obtaining low-defect LHPSCs from a solution at low temperatures is difficult compared to obtaining Bridgman single crystals such as CdTe and Si. Herein, noise from the intrinsic defects of LHPSCs is considered as the main problem hindering their gamma-ray detection performance. By isolating the defect-induced holes in LHPSCs via energy barriers, we show that NIN photodiodes based on three types of LHPSCs, i.e., MAPbBr (MA = CHNH), MAPbBrCl, and cascade LHPSCs, have demonstrated good energy resolution in the range of 6.7-10.3% for 662 keV Cs gamma-ray photons. The noise for >10 mm devices is low, in the order of 340-860 electrons, and the electron collection efficiency reaches 23-43%. These results pave the way for obtaining low-cost, large, high energy-resolution gamma-ray detectors at room temperature (300 K).
溶液法制备的卤化铅钙钛矿单晶（LHPSCs）被认为在伽马射线光谱学中具有巨大潜力。然而，与获得诸如碲化镉和硅等布里奇曼单晶相比，在低温下从溶液中获得低缺陷的LHPSCs是困难的。在此，LHPSCs固有缺陷产生的噪声被认为是阻碍其伽马射线探测性能的主要问题。通过能量势垒隔离LHPSCs中缺陷诱导的空穴，我们表明基于三种类型的LHPSCs（即MAPbBr（MA = CHNH）、MAPbBrCl和级联LHPSCs）的NIN光电二极管对于662 keV铯伽马射线光子在6.7 - 10.3%的范围内表现出良好的能量分辨率。对于大于10毫米的器件，噪声较低，约为340 - 860个电子，并且电子收集效率达到23 - 43%。这些结果为在室温（300 K）下获得低成本、大面积、高能量分辨率的伽马射线探测器铺平了道路。
