X‐Ray Irradiation Fluence‐Dependent Carrier Transport Capacity of MAPbBr3 Single Crystal

Author:

Luo Xiuting1,Gao Lei1,Sun Jia‐Lin2,Li Qiang1,Yan Qingfeng1ORCID

Affiliation:

1. Engineering Research Centre of Advanced Rare Earth Materials (Ministry of Education), Department of Chemistry Tsinghua University Beijing 100084 China

2. Department of Physics Tsinghua University Beijing 100084 China

Abstract

AbstractSignificant progress is achieved in the development of hybrid lead halide perovskite‐based X‐ray detectors. An in‐depth understanding of the impact of X‐ray irradiation on charge carrier behaviors is essential to assess the long‐term operational reliability of these devices. In this study, high‐quality methylammonium lead bromide (MAPbBr3) single crystals with good environmental stability are grown by an inverse temperature method, and the evolution of their carrier transport capacity is investigated by tracking the optoelectronic properties of MAPbBr3 single crystal devices under X‐ray irradiation with different fluence. Notably, the carrier transport capacity is enhanced when the X‐ray fluence is between 1.2 × 1017 and 1.8 × 1017 photons, as evidenced by improved optoelectronic properties and reduced trap state density. Conversely, a larger X‐ray fluence of 3.6 × 1017 photons causes unrepaired decomposition of the MAPbBr3 single crystals and severe degradation of their carrier transport capacity. These findings provide valuable insights for the application of hybrid lead perovskite single crystals in X‐ray detection, emphasizing the importance of optimizing X‐ray fluence levels for sustained device performance.

Funder

National Natural Science Foundation of China

China Postdoctoral Science Foundation

Publisher

Wiley

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