Constant-Pressure Atmosphere Engineering Induced δ-α Phase Transition in FAPbI3 Single Crystal for X-Ray Detection
Abstract
The lead halide perovskite single crystals (SCs) have already emerged as a series of star materials for solar cells, lasers and detectors due to the complete crystal structure, fewer defects and grain boundaries. Previous studies have demonstrated that MASCN gas can convert delta-FAPbI3 films into alpha-FAPbI3 below the phase transition temperature. However, applying this strategy to the exploration of FAPbI3 SCs remains a challenge. Herein, we designed a constant-pressure gas diffusion setup to treat delta-FAPbI3 SCs with MASCN vapor, successfully obtaining photoactive alpha-FAPbI3 SCs with enhanced optoelectronic properties. X-ray detectors based on the processed SCs exhibited significantly improved performance, achieving a high sensitivity of 4.46 x 104 mu C Gyair -1 cm-2, a ratio of sensitivity to dark current density as high as 1.06 x 1012 mu s Gyair -1, and a detection limit as low as 150 nGyair s-1. Furthermore, due to the strong polarizing nature of sulfur, some SCN- ions formed stable bonds with Pb2+ in the crystal lattice, thereby enhancing the environmental stability of FAPbI3. The processed SCs maintained their phase purity without degradation after one month of storage in ambient conditions. This work offers a new strategy for repurposing delta-FAPbI3 SCs and advances the development of perovskite SC X-ray detectors.
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BibTeX
@article{jin2026constantpressure,
title = {{Constant-Pressure Atmosphere Engineering Induced δ-α Phase Transition in FAPbI3 Single Crystal for X-Ray Detection}},
author = {Gang Jin and Guangya Zheng and Xiaoqing Liu and Hong Li and Jiaqi Liu and Yinsheng Xu and Xianghua Zhang and Mengling Xia and Jiang Tang},
journal = {Advanced Optical Materials},
year = {2026},
month = sep,
doi = {10.1002/adom.202503807},
url = {https://hal.science/hal-05512577v1},
note = {CC BY-NC 4.0},
}
RIS
TY - JOUR
TI - Constant-Pressure Atmosphere Engineering Induced δ-α Phase Transition in FAPbI3 Single Crystal for X-Ray Detection
AU - Gang Jin
AU - Guangya Zheng
AU - Xiaoqing Liu
AU - Hong Li
AU - Jiaqi Liu
AU - Yinsheng Xu
AU - Xianghua Zhang
AU - Mengling Xia
AU - Jiang Tang
PY - 2026
DA - 2026/09/03
JO - Advanced Optical Materials
DO - 10.1002/adom.202503807
UR - https://hal.science/hal-05512577v1
AB - The lead halide perovskite single crystals (SCs) have already emerged as a series of star materials for solar cells, lasers and detectors due to the complete crystal structure, fewer defects and grain boundaries. Previous studies have demonstrated that MASCN gas can convert delta-FAPbI3 films into alpha-FAPbI3 below the phase transition temperature. However, applying this strategy to the exploration of FAPbI3 SCs remains a challenge. Herein, we designed a constant-pressure gas diffusion setup to treat delta-FAPbI3 SCs with MASCN vapor, successfully obtaining photoactive alpha-FAPbI3 SCs with enhanced optoelectronic properties. X-ray detectors based on the processed SCs exhibited significantly improved performance, achieving a high sensitivity of 4.46 x 104 mu C Gyair -1 cm-2, a ratio of sensitivity to dark current density as high as 1.06 x 1012 mu s Gyair -1, and a detection limit as low as 150 nGyair s-1. Furthermore, due to the strong polarizing nature of sulfur, some SCN- ions formed stable bonds with Pb2+ in the crystal lattice, thereby enhancing the environmental stability of FAPbI3. The processed SCs maintained their phase purity without degradation after one month of storage in ambient conditions. This work offers a new strategy for repurposing delta-FAPbI3 SCs and advances the development of perovskite SC X-ray detectors.
SN - 2195-1071
ER -