Reproducible high-quality perovskite single crystals by flux-regulated crystallization with a feedback loop.

Controlling the linear growth rate, a critical factor that determines crystal quality, has been a challenge in solution-grown single crystals due to complex crystallization kinetics influenced by multiple parameters. Here we introduce a flux-regulated crystallization (FRC) method to directly monitor and feedback-control the linear growth rate, circumventing the need to control individual growth conditions. When applied to metal halide perovskites, the FRC maintains a stable linear growth rate for over 40 h in synthesizing CH ₃ NH ₃ PbBr ₃ and CsPbBr ₃ single crystals, achieving outstanding crystallinity (quantified by a full width at half-maximum of 15.3 arcsec in the X-ray rocking curve) in a centimetre-scale single crystal. The FRC is a reliable platform for synthesizing high-quality crystals essential for commercialization and systematically exploring crystallization conditions, maintaining a key parameter-the linear growth rate-constant, which enables a comprehensive understanding of the impact of other influencing factors.
Competing Interests: Competing interestsM.I.S. is a co-founder of AY-Sensor Inc. which commercializes perovskite single crystals for radiation detection applications. The other authors declare no competing interests.
(© The Author(s) 2024.)