Polar Solvent Induced Lattice Distortion of Cubic CsPbI3 Nanocubes and Hierarchical Self-Assembly into Orthorhombic Single-Crystalline Nanowires

• DOI: 10.1021/jacs.8b05949
• Publication Date: 2018-08-15T23:34:33Z
• Authors: Jian-Kun Sun; Sheng Huang; Xiao-Zhi Liu; Quan Xu; Qing-Hua Zhang; Wen-Jie Jiang; Ding-Jiang Xue; Jia-Chao Xu; Jing-Yuan Ma; Jie Ding; Qian-Qing Ge; Lin Gu; Xiao-Hong Fang; Hai-Zheng Zhong; Jin-Song Hu; Li-Jun Wan
• Keywords: 2. Zero hunger; 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 7. Clean energy; 0104 chemical sciences

Despite the recent surge of interest in inorganic lead halide perovskite nanocrystals, there are still significant gaps in their stability disturbance and the understanding of their destabilization, assembly, and growth processes. Here, we discover that polar solvent molecules can induce the lattice distortion of ligand-stabilized cubic CsPbI3, leading to the phase transition into orthorhombic phase, which is unfavorable for photovoltaic applications. Such lattice distortion triggers the dipole moment on CsPbI3 nanocubes, which subsequently initiates the hierarchical self-assembly of CsPbI3 nanocubes into single-crystalline nanowires. The systematic investigations and in situ monitoring on the kinetics of the self-assembly process disclose that the more amount or the stronger polarity of solvent can induce the more rapid self-assembly and phase transition. These results not only elucidate the destabilization mechanism of cubic CsPbI3 nanocrystals, but also open up opportunities to synthesize and store cubic CsPbI3 for their practical applications in photovoltaics and optoelectronics.