journal article·2025-02-14

Ion Migration Suppression via Doping Multivalent Cations in Perovskite for High Thermal Stability X-ray Detectors

Xiaolong Feng, Lu Zhang, Xiaofeng Feng, Jiaxue You, Jiacheng Pi, Hanqing Zeng, Depeng Chu, Chengzhi Xue, Ke Zhao, Shilong Jia, Pengda Tong, Zhiwen Jin, Yucheng Liu, Alex K.-Y. Jen, Shengzhong Frank Liu

ACS Energy Letters· Volume 10· Issue 2
Publisher page

Abstract

CsPb 2 Br 5 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 Cr 3+ 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 CsPb 2 Br 5 exhibits a high μτ value of 5.46 × 10 –3 cm 2 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 Gy air – 1 cm – 2 and a low detection dose rate of 11.5 nGy air s – 1, with stable performance in X-ray imaging at elevated temperatures, making it suitable for complex environments.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · Magnetic and transport properties of perovskites and related materials · Electronic and Structural Properties of Oxides

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering

Shaanxi Normal University

First Affiliated Hospital of Harbin Medical University

Department of Materials Science and Engineering, Hong Kong Institute for Clean Energy

City University of Hong Kong

Northwestern Polytechnical University, Institute of Flexible Electronics

MOE Key Laboratory of Cluster Science, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering

Beijing Institute of Technology

School of Physical Science and Technology & College of Chemistry and Chemical Engineering & Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education

Lanzhou University

Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy

Dalian Institute of Chemical Physics, Chinese Academy of Sciences

Center of Materials Science and Optoelectronics Engineering

University of Chinese Academy of Sciences

CNNP Optoelectronics Technology

Funding

Natural Science Basic Research Program of Shaanxi Province · Fundamental Research Funds for the Central Universities · National Natural Science Foundation of China · Shaanxi Normal University · Higher Education Discipline Innovation Project

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