Nucleation-controlled Growth of Superior Lead-Free Perovskite Cs3Bi2I9 Single-Crystals for High-Performance X-ray Detection
Yunxia ZHANG a, Yucheng Liu a, Zhuo Xu a, Shengzhong Liu a
a Shaanxi Key Laboratory for Advanced Energy Devices; Shaanxi Engineering Lab for Advanced Energy Technology; Institute for Advanced Energy Materials; School of Materials Science and Engineering, Shaanxi Normal University, Xi’an 710119, China.
nanoGe Perovskite Conferences
Proceedings of International online conference on Hybrid materials and optoelectronic devices (HYBRIDOE)
Online, Spain, 2020 December 15th - 17th
Organizers: Xueqing Xu, Baomin Xu, Hin-Lap (Angus) Yip and Xinhua Zhong
Oral, Yunxia ZHANG, presentation 046
Publication date: 4th December 2020

The organic-inorganic hybrid lead halide perovskites have emerged as a series of star materials for solar cells, lasers and detectors. However, the issues raised by the toxic lead element and marginal stability due to the volatile organic components have severely limited their potential applications. In this regard, the all-inorganic, lead-free perovskite Cs3Bi2I9 with advantages of high atomic number elements, high resistivity, and long-term environmental stability, is expected to be an ideal candidate for X-ray detectors. Herein, we developed a nucleation-controlled method to grow large size high-quality Cs3Bi2I9 perovskite single crystals (PSCs). Using the technique, we have harvested some centimeter-sized single crystals and achieved high device performance. It is found that the X-ray detectors based on the Cs3Bi2I9 PSCs exhibit not only high sensitivity as much as 1652.3 μC Gyair-1 cm-2 but also very low detectable dose rate 130 nGyair s-1, both are desired in medical diagnostics. In addition, its outstanding thermal stability inspires us to develop a high temperature X-ray detector with stable response at up to 100 oC. Furthermore, the Cs3Bi2I9 PSCs exhibit high X-ray imaging capability thanks to its negligible signal drifting and extremely high stability. This may pave a way for them to be used in more advanced radiation imaging, sensing and energy harvesting.

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