A Strategy toward New Low-Dimensional Hybrid Halide Perovskites with Anionic Spacers

作者：Zhao, Yizhou; Zhang, Siyu; Lu, Yue; Lan, Shangui; Zhu, Cheng; Xiao, Jiawen; Zai, Huachao; Sui, Manling; Li, Dehui; Zhou, Huanping; Li, Yujing^*; Chen, Qi^*

来源：Small, 2019, 15(6): 1804152.

DOI：10.1002/smll.201804152

• halide perovskites
• low-dimensional materials
• nanocrystals
• photoluminescence

The low-dimensional halide perovskites have received enormous attention due to their unique photovoltaic and optoelectronic performances. Periodic spacers are used to inhibit the growth of 3D perovskite and fabricate a 2D counterpart with layered structure, mostly based on organic/inorganic cations. Herein, by introducing organic anions (e.g., pentanedioic acid (PDA) and hexanedioic acid (HDA) simultaneously), leaf-shaped (Cs3Pb2Br5)(2)(PDA-HDA) microplates with low-dimensional structure are synthesized. They also exhibit significant photoluminescence (PL) centered at 540 nm with a narrow emission peak. The synthesis of single crystals of Pb(PDA) and Pb(HDA) allows to further clarify the crystal structure of (Cs3Pb2Br5)(2)(PDA-HDA) perovskite and its structural evolution mechanism. Moreover, the cooperative introduction of dicarboxylic acid pairs with appropriate lengths is thermodynamically favored for the low-dimensional perovskite crystallization. The temperature-dependent PL indicates a V-shaped Stokes shift with elevated temperature that could be associated with the localization of excitons in the inorganic layers between organic dicarboxylic acid molecules. This work demonstrates low-dimensional halide perovskite with anionic spacers, which also opens up a new approach to the growth of low-dimensional organic-inorganic hybrid perovskite crystals.

• 出版日期2019-2
• 单位北京大学; 北京理工大学; 北京工业大学; 华中科技大学