Abstract
Metal halide perovskites have fascinated the research community over the past decade, and demonstrated unprecedented success in optoelectronics. In particular, perovskite single crystals have emerged as promising candidates for ionization radiation detection, due to the excellent opto-electronic properties. However, most of the reported crystals are grown in organic solvents and require high temperature. In this work, we develop a low-temperature crystallization strategy to grow CsPbBr3 perovskite single crystals in water. Then, we carefully investigate the structure and optoelectronic properties of the crystals obtained, and compare them with CsPbBr3 crystals grown in dimethyl sulfoxide. Interestingly, the water grown crystals exhibit a distinct crystal habit, superior charge transport properties and better stability in air. We also fabricate X-ray detectors based on the CsPbBr3 crystals, and systematically characterize their device performance. The crystals grown in water demonstrate great potential for X-ray imaging with enhanced performance metrics.
Highlights
Metal halide perovskites have fascinated the research community over the past decade, and demonstrated unprecedented success in optoelectronics
We systematically characterize the crystal structure and optoelectronic properties, and compare water-grown single crystals (SCs) with their counterparts grown in dimethyl sulfoxide (DMSO)
It has been well recognized in the field that the optimal solvents to grow SCs via the inverse-temperature crystallization (ITC) method are gamma-butyrolactone (GBL) and dimethylformamide (DMF) for I− and Br− based organicinorganic hybrid perovskites, respectively[26]
Summary
Metal halide perovskites have fascinated the research community over the past decade, and demonstrated unprecedented success in optoelectronics. Different from the heating up process in the DMSO method, the crystal structure and composition of the products grown in water can be precisely controlled by adjusting the ratio of CsBr and PbBr2 (Supplementary Fig. 1a).
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