Heterointerface Design of Perovskite Single Crystals for High-Performance X-Ray Imaging

Xiaojie Zhang, Depeng Chu, Binxia Jia, Zeqin Zhao, Jiacheng Pi, Zhou Yang, Yaohui Li, Jinglu Hao, Ruixin Shi, Xiaofeng Dong, Yuqian Liang, Jiangshan Feng, Adel Najar, Yucheng Liu, Shengzhong Liu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Metal halide perovskite single crystals (MHP-SCs) are known for their facile fabrication into large sizes using inexpensive solution methods. Owing to their combination of large mobility-lifetime products and strong X-ray absorption, they are considered promising materials for efficient X-ray detection. However, they suffer from large dark currents and severe ion migration, which limit their sensitivity and stability in critical X-ray detection applications. Herein, a heterointerface design is proposed to reduce both the dark current and ion migration by forming a heterojunction. In addition, the carrier transport performance is significantly improved using heterointerface engineering by designing a gradient band structure in the SCs. The SC heterojunction detectors exhibit a high sensitivity of 3.98 × 105 µC Gyair−1 cm−2 with a low detection limit of 12.2 nGyair s−1 and a high spatial resolution of 10.2 lp mm−1 during imaging. These values are among the highest reported for state-of-the-art MHP X-ray detectors. Moreover, the detectors show excellent stability under continuous X-ray irradiation and maintainclear X-ray imaging after 240 d. This study provides novel insights into the design and fabrication of X-ray detectors with high detection efficiency and stability, which are beneficial for developing inexpensive, high-resolution X-ray imaging equipment.

Original languageEnglish
Article number2305513
JournalAdvanced Materials
Volume36
Issue number3
DOIs
Publication statusPublished - Jan 18 2024

Keywords

  • X-ray detection
  • halide perovskite
  • heterointerface design
  • single crystal

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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