Reversible Transformation between CsPbBr3 Perovskite Nanowires and Nanorods with Polarized Optoelectronic Properties. (26th March 2021)

• Record Type: Journal Article
• Authors: Wang, Yongkai; Liu, Xiaoyu; He, Qiqian; Chen, Gaoyu; Xu, Dongdong; Chen, Xudong; Zhao, Wenbo; Bao, Jianchun; Xu, Xiangxing; Liu, Junli; Wang, Xun
• Is Part Of: Advanced functional materials. Volume 31:Number 22(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-03-26
• Subjects: morphology transformation -- perovskite nanorods -- perovskite nanowires -- photodetector -- polarized optoelectronic property; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202011251
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: CsPbX3 (X = Cl, Br, I) perovskite nanowires and nanorods are important 1D and quasi 1D semiconductor nanomaterials. They have shown significant prospect in optic and optoelectronic applications, especially for their adaptability to flexible devices, good carrier transport performance, polarized absorption, and emission properties. Due to the high dependence of the property to the morphology, it is crucial to develop synthesis methods with continuous diameter and length tunability of the 1D/quasi 1D perovskites. In this report, a feasibly room temperature synthesis method was developed for ultrathin CsPbX3 (X = Cl, Br, I) perovskite nanowires. By aging the CsPbBr3 nanowires (≈2*500 nm) under ambient condition with proper concentration and time, the nanowires are transformed to nanorods with controllable diameter and length. Reversibly, the nanorods can be transformed back to nanowires. Equilibrium mechanism is adopted to understand the morphology evolution, and hopefully could be generally applied to many other nano materials. The polarized optoelectronic properties of the nanowires and nanorods are interpreted by a model based on the two‐channel anisotropies measurement. Polarized light detectors constructed by oriented assembled nanowires are fabricated to demonstrate their application potentials. Abstract : A room temperature synthesis method of ultrathin CsPbX3 (X = Cl, Br, I) perovskite nanowires is developed. Based on the controllable equilibrium of nanocrystals in solution, reversible transform between CsPbBr3 nanowires and nanorods are revealed. The assembled perovskite nanowires/nanorods films show outstanding polarized optoelectronic properties. Polarized light detectors are fabricated to demonstrate their application potentials.