TY - JOUR
T1 - Ion Migration Suppression via Doping Multivalent Cations in Perovskite for High Thermal Stability X-ray Detectors
AU - Feng, Xiaolong
AU - Zhang, Lu
AU - Feng, Xiaofeng
AU - You, Jiaxue
AU - Pi, Jiacheng
AU - Zeng, Hanqing
AU - Chu, Depeng
AU - Xue, Chengzhi
AU - Zhao, Ke
AU - Jia, Shilong
AU - Tong, Pengda
AU - Jin, Zhiwen
AU - Liu, Yucheng
AU - Jen, Alex K.-Y.
AU - Liu, Shengzhong Frank
PY - 2025/2/14
Y1 - 2025/2/14
N2 - CsPb2Br5 single crystals (SCs) are promising for X-ray detection due to their high absorption, excellent photoelectric properties, and stability. However, thermal stress in high-temperature environments accelerates ion migration within perovskite structures, leading to degraded performance. In this study, we investigate the effects of Cr3+ doping, which induces lattice contraction and distortion due to its small ionic radius and strong electrophilic properties. This increases the formation energy of Br vacancies and activation energy for ion migration, enhancing the crystal’s resistance to thermal stress. As a result, Cr-doped CsPb2Br5 exhibits a high μτ value of 5.46 × 10-3 cm2 V-1, a lower temperature coefficient of resistance (−1.58 × 10-2 °C-1), and excellent ion migration resistance at 70 °C. These improvements lead to a high sensitivity of 7183.5 μC Gyair-1 cm-2 and a low detection dose rate of 11.5 nGyair s-1, with stable performance in X-ray imaging at elevated temperatures, making it suitable for complex environments. © 2025 American Chemical Society.
AB - CsPb2Br5 single crystals (SCs) are promising for X-ray detection due to their high absorption, excellent photoelectric properties, and stability. However, thermal stress in high-temperature environments accelerates ion migration within perovskite structures, leading to degraded performance. In this study, we investigate the effects of Cr3+ doping, which induces lattice contraction and distortion due to its small ionic radius and strong electrophilic properties. This increases the formation energy of Br vacancies and activation energy for ion migration, enhancing the crystal’s resistance to thermal stress. As a result, Cr-doped CsPb2Br5 exhibits a high μτ value of 5.46 × 10-3 cm2 V-1, a lower temperature coefficient of resistance (−1.58 × 10-2 °C-1), and excellent ion migration resistance at 70 °C. These improvements lead to a high sensitivity of 7183.5 μC Gyair-1 cm-2 and a low detection dose rate of 11.5 nGyair s-1, with stable performance in X-ray imaging at elevated temperatures, making it suitable for complex environments. © 2025 American Chemical Society.
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U2 - 10.1021/acsenergylett.4c03201
DO - 10.1021/acsenergylett.4c03201
M3 - RGC 21 - Publication in refereed journal
SN - 2380-8195
VL - 10
SP - 685
EP - 695
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 2
ER -