Phase Engineering for Stability of CsPbI3 Nanowire Optoelectronics

Dengji Li; Pengshan Xie; Yuxuan Zhang; You Meng; Yancong Chen; Yini Zheng; Weijun Wang; Di Yin; Bowen Li; Zenghui Wu; Changyong Lan; SenPo Yip; Dangyuan Lei; Fu-Rong Chen; Johnny C. Ho

doi:10.1002/adfm.202314309

Author(s)

Yancong Chen
Weijun Wang
Di Yin
Bowen Li
Zenghui Wu
Changyong Lan
SenPo Yip
Dangyuan Lei
Fu-Rong Chen
Johnny C. Ho

Related Research Unit(s)

Department of Materials Science and Engineering

Detail(s)

Original language	English
Journal / Publication	Advanced Functional Materials
Online published	31 Jan 2024
Publication status	Published - 22 May 2024

Link(s)

DOI	DOI https://doi.org/10.1002/adfm.202314309 Final Published version
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Attachment(s)	Documents 221469687.pdf Final Published version, 2.51 MB, PDF Publisher's Copyright Statement This full text is made available under CC-BY-NC-ND 4.0. https://creativecommons.org/licenses/by-nc-nd/4.0/
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85183606660&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(a55ce571-1b66-4b2e-a75d-83fe7e6e2b8b).html

Abstract

Zinc (Zn) has arisen as a significant suppressor of vacancy formation in halide perovskites, establishing its pivotal role in defect engineering for these materials. Herein, the Zn-catalyzed vapor-liquid-solid (VLS) route is reported to render black-phase CsPbI₃ nanowires (NWs) operationally stable at room temperature. Based on first-principle calculations, the doped Zn²⁺ can not only lead to the partial crystal lattice distortion but also reduce the formation energy (absolute value) from the black phase to the yellow phase, improving the stability of the desired black-phase CsPbI₃ NWs. A series of contrast tests further confirm the stabilization effect of the Zn-doped strategy. Besides, the polarization-sensitive characteristics of black-phase CsPbI₃ NWs are revealed. This work highlights the importance of phase stabilization engineering for CsPbI₃ NWs and their potential applications in anisotropic optoelectronics. © 2024 The Authors. Advanced Functional Materials published by Wiley-VCH GmbH.