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Lead halide perovskite nanowires stabilized by block copolymers for Langmuir-Blodgett assembly
Nano Research ( IF 9.9 ) Pub Date : 2020-03-09 , DOI: 10.1007/s12274-020-2717-9
Hao Liu , Martin Siron , Mengyu Gao , Dylan Lu , Yehonadav Bekenstein , Dandan Zhang , Letian Dou , A. Paul Alivisatos , Peidong Yang

Abstract

The rapid development of solar cells based on lead halide perovskites (LHPs) has prompted very active research activities in other closely-related fields. Colloidal nanostructures of such materials display superior optoelectronic properties. Especially, one-dimensional (1D) LHPs nanowires show anisotropic optical properties when they are highly oriented. However, the ionic nature makes them very sensitive to external environment, limiting their large scale practical applications. Here, we introduce an amphiphilic block copolymer, polystyrene-block-poly(4-vinylpyridine) (PS-P4VP), to chemically modify the surface of colloidal CsPbBr3 nanowires. The resulting core-shell nanowires show enhanced photoluminescent emission and good colloidal stability against water. Taking advantage of the stability enhancement, we further applied a modified Langmuir-Blodgett technique to assemble monolayers of highly aligned nanowires, and studied their anisotropic optical properties.



中文翻译:

嵌段共聚物稳定的卤化钙钛矿铅纳米线用于Langmuir-Blodgett组装

摘要

基于卤化钙钛矿(LHPs)的太阳能电池的快速发展促使在其他密切相关领域的研究活动非常活跃。这种材料的胶体纳米结构显示出优异的光电性能。特别是,一维(1D)LHPs纳米线在高度取向时显示出各向异性的光学特性。然而,离子性质使它们对外部环境非常敏感,限制了它们的大规模实际应用。在这里,我们介绍一种两亲性嵌段共聚物,聚苯乙烯-嵌段-聚(4-乙烯基吡啶)(PS-P4VP),以化学修饰胶体CsPbBr 3的表面纳米线。所得的核-壳纳米线显示出​​增强的光致发光发射和对水的良好胶体稳定性。利用稳定性增强的优势,我们进一步应用了改良的Langmuir-Blodgett技术来组装高度对齐的纳米线单层,并研究了它们的各向异性光学特性。

更新日期:2020-03-09
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