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Liu Shengzhong team's Work on perovskite single-crystals published on Nature Communications

2020-05-17

 

On may 8, Shaanxi Normal Universitys research team led by School of Materials Science and Engineering Prof. Liu Shengzhong published their work in lead-free perovskite Cs3Bi2I9 single-crystals for high-performance X-ray detection on Nature Communications (volume 11, article number: 2304 (2020)).

The research article is titled Nucleation-controlled growth of superior lead-free perovskite Cs3Bi2I9 single-crystals for high-performance X-ray detection (https://www.nature.com/articles/s41467-020-16034-w), with SMSE doctoral candidate Zhang Yunxia and Prof. Liu Yucheng as co-first authors, and Prof. Liu Shengzhong (Frank) as correspondence author.

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 work, they developed a nucleation-controlled solution method to grow large size high-quality Cs3Bi2I9 perovskite single crystals (PSCs).

Using the technique, they harvested some centimeter-sized single crystals and achieved high device performance. They find that X-ray detectors based on PSCs exhibit high sensitivity of 1652.3 μC Gyair−1 cm−2 and very low detectable dose rate of 130 nGyair s−1, both desired in medical diagnostics. In addition, its outstanding thermal stability inspired them to develop a high temperature X-ray detector with stable response at up to 100 ℃. Furthermore, PSCs exhibit high X-ray imaging capability thanks to its negligible signal drifting and extremely high stability.


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