Ren Kuankuan, Wang Jian, Liu Kong, Huang Yanbin, Sun Yang, Azam Muhammad, Jin Peng, Wang Zhijie, Qu Shengchun, Wang Zhanguo
Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences Beijing 100083 China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences Beijing 100049 China.
RSC Adv. 2019 Jun 25;9(34):19772-19779. doi: 10.1039/c9ra01689a. eCollection 2019 Jun 19.
Controllable growth of perovskite nanowires is very important for various applications in optical and electrical devices. Although significant progress has been achieved in the solution method, a deep understanding of the mechanics of growing perovskite nanowires is still lacking. Herein, we developed an electrochemical method for growing the perovskite nanowires and studied the growth processes systematically. The initial nucleation and crystal growth could be controlled by simply varying the additive solvents, thus leading to two stable size ratio distributions of the perovskite nanowires. Further, with compositional engineering, the bandgap of the perovskites could be tuned from 1.59 eV to 3.04 eV. All the as-grown perovskite nanowires displayed a unique structure with high crystallization quality, contributing to a very high responsivity of 2.1 A W and a large on/off ratio of 5 × 10 for the photodetectors based on the CHNHPbBr nanowires. All of these findings demonstrate that the optimized solution method offers a new approach to synthesize perovskite nanowires for applications in photoelectric devices.
钙钛矿纳米线的可控生长对于光学和电气设备中的各种应用非常重要。尽管在溶液法方面已经取得了重大进展，但对钙钛矿纳米线生长机制仍缺乏深入了解。在此，我们开发了一种用于生长钙钛矿纳米线的电化学方法，并系统地研究了生长过程。通过简单改变添加剂溶剂可以控制初始成核和晶体生长，从而导致钙钛矿纳米线出现两种稳定的尺寸比分布。此外，通过成分工程，钙钛矿的带隙可以从1.59 eV调谐到3.04 eV。所有生长的钙钛矿纳米线都呈现出具有高结晶质量的独特结构，这使得基于CHNHPbBr纳米线的光电探测器具有2.1 A W的非常高的响应度和5×10的大开关比。所有这些发现表明，优化的溶液法为合成用于光电器件的钙钛矿纳米线提供了一种新方法。
