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Enhancing Gamma-Ray Spectral Resolution in Perovskite CsPbBr3 Detectors through Dark Current Reduction with Guard Ring Electrodes
ACS Photonics ( IF 6.5 ) Pub Date : 2024-08-29 , DOI: 10.1021/acsphotonics.4c00768 Nannan Shen 1 , Tingting Gao 1 , Xiao Ouyang 2 , Khasim Saheb Bayikadi 3 , Zhiyu Duan 4 , Bao Xiao 1 , Xuchang He 1 , Yuquan Wang 1 , Haoming Qin 1 , Qihao Sun 1 , Luyao Wang 1 , Yifei Lai 1 , Xueping Liu 1 , Ruohan Ren 1 , Mercouri G. Kanatzidis 3 , Yihui He 1
ACS Photonics ( IF 6.5 ) Pub Date : 2024-08-29 , DOI: 10.1021/acsphotonics.4c00768 Nannan Shen 1 , Tingting Gao 1 , Xiao Ouyang 2 , Khasim Saheb Bayikadi 3 , Zhiyu Duan 4 , Bao Xiao 1 , Xuchang He 1 , Yuquan Wang 1 , Haoming Qin 1 , Qihao Sun 1 , Luyao Wang 1 , Yifei Lai 1 , Xueping Liu 1 , Ruohan Ren 1 , Mercouri G. Kanatzidis 3 , Yihui He 1
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Halide perovskites, considered a new generation of semiconductors, have demonstrated notable advancements in nuclear radiation detection, highlighting their cost-effectiveness in fabrication. However, great challenges can arise from crystal edge effects associated with imperfect surface status, likely resulting in high surface leakage currents and incomplete charge collections, which greatly impede the obtaining of excellent spectroscopic capability. In this work, a guard ring configuration for shielding edge effects was designed on a perovskite CsPbBr3 detector for spectral optimization and long-term stabilization. The implementation of a guard ring resulted in significantly decreased and stable leakage currents passing through the central collecting electrode. As a result, the bulk leakage current from the active region was reduced by approximately 80%. Consequently, the 122 and 136 keV photopeaks in 57Co γ-ray spectra were well resolved, with an energy resolution improvement from ∼9.8 to 4.8% at 122 keV. Notably, the low energy tailing of the photopeak has been greatly weakened by reducing the edge effects.
中文翻译：
通过保护环电极降低暗电流来提高钙钛矿 CsPbBr3 探测器的伽马射线光谱分辨率
卤化物钙钛矿被认为是新一代半导体，在核辐射检测方面表现出了显着的进步，凸显了其制造成本效益。然而，与不完美的表面状态相关的晶体边缘效应可能会带来巨大的挑战，可能导致高表面漏电流和不完整的电荷收集，这极大地阻碍了优异光谱能力的获得。在这项工作中，在钙钛矿 CsPbBr 3探测器上设计了用于屏蔽边缘效应的保护环配置，以实现光谱优化和长期稳定性。保护环的实施导致通过中心收集电极的漏电流显着降低且稳定。结果，有源区的体漏电流减少了约 80%。因此， 57 Co γ 射线光谱中的 122 和 136 keV 光峰得到了很好的分辨率，122 keV 下的能量分辨率从 ∼9.8% 提高到 4.8%。值得注意的是，通过减少边缘效应，光峰的低能拖尾已被大大削弱。
更新日期：2024-08-29
中文翻译：
通过保护环电极降低暗电流来提高钙钛矿 CsPbBr3 探测器的伽马射线光谱分辨率
卤化物钙钛矿被认为是新一代半导体，在核辐射检测方面表现出了显着的进步，凸显了其制造成本效益。然而，与不完美的表面状态相关的晶体边缘效应可能会带来巨大的挑战，可能导致高表面漏电流和不完整的电荷收集，这极大地阻碍了优异光谱能力的获得。在这项工作中，在钙钛矿 CsPbBr 3探测器上设计了用于屏蔽边缘效应的保护环配置，以实现光谱优化和长期稳定性。保护环的实施导致通过中心收集电极的漏电流显着降低且稳定。结果，有源区的体漏电流减少了约 80%。因此， 57 Co γ 射线光谱中的 122 和 136 keV 光峰得到了很好的分辨率，122 keV 下的能量分辨率从 ∼9.8% 提高到 4.8%。值得注意的是，通过减少边缘效应，光峰的低能拖尾已被大大削弱。
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