Ultra‐Long Carrier Lifetime of Spiral Perovskite Nanowires Realized through Cooperative Strategy of Selective Etching and Passivation

• Published in: Small (Weinheim an der Bergstrasse, Germany) Germany), 2024-11, Vol.20 (45), p.e2404861-n/a
• Main Authors: Zheng, Cheng, He, Jia, Liu, Wei, Liu, Zhiwen, Xu, Linfeng, Cao, Zetan, Jiao, Chuangwei, Chen, Bin
• Format: Article
• Language: English
• Subjects: Carrier lifetime; Chemical synthesis; Cooperative control; CsPbBr3 perovskite; Dislocation density; Etchants; Etching; Grain boundaries; grain boundary; Lifetime; ligand engineering; Ligands; Morphology; Nanowires; Optoelectronics; Perovskites; spiral nanowires; Twisting; ultra‐long carrier lifetime
• ISSN: 1613-6810; 1613-6829; 1613-6829
• DOI: 10.1002/smll.202404861

Spiral inorganic perovskite nanowires (NWs) possess unique morphologies and properties that allow them highly attractive for applications in optoelectronic and catalytic fields. In popular solution‐based synthesis methodology, however, challenges persist in simultaneously achieving precise and facile control over morphological twisting and fantastic carrier lifetimes. Here, a cooperative strategy of concurrently employing selective etching and ligand engineering is applied to facilitate the formation of spiral CsPbBr3 perovskite NWs with an ultralong carrier lifetime of ≈2 µs. Specifically, a novel amine of 1‐(p‐tolyl)ethanamine is introduced to functionalize as both a selective etchant and the source of forming an effective ligand to passivate the exposed facets, favoring the structural twisting and the enhancement of carrier lifetimes. The twisting behaviors are dependent on the etch ratios, which are essentially associated with the densities of grain boundaries and dislocations in the NWs. The ultralong carrier lifetime and long‐term stability of the spiral NWs open up new possibilities for all‐inorganic perovskites in optoelectronic and photocatalytic fields, while the cooperative synthesis strategy paves the way for exploring complex spiral structures with tunable morphology and functionality. Through a cooperative approach of selective etching and ligand engineering by introducing a novel amine, spiral CsPbBr3 perovskite nanowires with an ultra‐long carrier lifetime of ≈2 µs are achieved. This strategy enables the fabrication and modulation of complex spiral perovskite structures with specific exposed facets as well as enhanced functionality and stability.