A Ternary Solvent Method for Large-Sized Two-Dimensional Perovskites

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• 作者：Dr. Junnian Chen ; Dr. Lin Gan ; Dr. Fuwei Zhuge ; Dr. Huiqiao Li ; Dr. Jizhong Song ; Prof. Dr. Haibo Zeng and Prof. Dr. Tianyou Zhai
• 刊名：Angewandte Chemie International Edition
• 出版年：2017
• 出版时间：February 20, 2017
• 年：2017
• 卷：56
• 期：9
• 页码：2390-2394
• 全文大小：4428K
• ISSN：1521-3773

文摘

Recent reports demonstrate that a two-dimensional (2D) structural characteristic can endow perovskites with both remarkable photoelectric conversion efficiency and high stability, but the synthesis of ultrathin 2D perovskites with large sizes by facile solution methods is still a challenge. Reported herein is the controlled growth of 2D (C₄H₉NH₃)₂PbBr₄ perovskites by a chlorobenzene-dimethylformide-acetonitrile ternary solvent method. The critical factors, including solvent volume ratio, crystallization temperature, and solvent polarity on the growth dynamics were systematically studied. Under optimum reaction condition, 2D (C₄H₉NH₃)₂PbBr₄ perovskites, with the largest lateral dimension of up to 40 μm and smallest thickness down to a few nanometers, were fabricated. Furthermore, various iodine doped 2D (C₄H₉NH₃)₂PbBr_xI_4−x perovskites were accessed to tune the optical properties rationally.