High-Entropy Design for 2D Halide Perovskite

作者：Yan Song, Shun Lan, Bingbing Yang, Yunpeng Zheng, Zhifang Zhou, Ce‐Wen Nan, Yuanhua Lin · 发表于：Journal of the American Chemical Society · 年份：2024 · DOI：10.1021/jacs.4c01882 · 被引用次数：41 · 研究领域：Perovskite Materials and Applications、Solid-state spectroscopy and crystallography、2D Materials and Applications

Hybrid halide perovskites are good candidates for a range of functional materials such as optical electronic and photovoltaic devices due to their tunable band gaps, long carrier diffusion lengths, and solution processability. However, the instability in moisture/air, the toxicity of lead, and rigorous reaction setup or complex postprocessing have long been the bottlenecks for practical application. Herein, we present a simultaneous configurational entropy design at A-sites, B-sites, and X-sites in the typical (CHA) 2 PbBr 4 two-dimensional (2D) hybrid perovskite. Our results demonstrate that the high-entropy effect favors the stabilization of the hybrid perovskite phase and facilitates a simple crystallization process without precise control of the cooling rate to prepare regular crystals. Moreover, high-entropy 2D perovskite crystals exhibit tunable energy band gaps, broadband emission, and a long carrier lifetime. Meanwhile, the high-entropy composition almost maintains the initial crystal structure in deionized water for 18 h while the original (CHA) 2 PbBr 4 crystal mostly decomposes, suggesting obviously improved humidity stability. This work offers a facile approach to synthesize humidity-stable hybrid perovskites under mild conditions, accelerating relevant preparation of optoelectronics and light-emitting devices and facilitating the ultimate commercialization of halide perovskite.