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Issue 22, 2017
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Surface passivation of mixed-halide perovskite CsPb(BrxI1−x)3 nanocrystals by selective etching for improved stability

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Abstract

In recent years, there has been an unprecedented rise in the research of halide perovskites because of their important optoelectronic applications, including photovoltaic cells, light-emitting diodes, photodetectors and lasers. The most pressing question concerns the stability of these materials. Here faster degradation and PL quenching are observed at higher iodine content for mixed-halide perovskite CsPb(BrxI1−x)3 nanocrystals, and a simple yet effective method is reported to significantly enhance their stability. After selective etching with acetone, surface iodine is partially etched away to form a bromine-rich surface passivation layer on mixed-halide perovskite nanocrystals. This passivation layer remarkably stabilizes the nanocrystals, making their PL intensity improved by almost three orders of magnitude. It is expected that a similar passivation layer can also be applied to various other kinds of perovskite materials with poor stability issues.

Graphical abstract: Surface passivation of mixed-halide perovskite CsPb(BrxI1−x)3 nanocrystals by selective etching for improved stability

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Publication details

The article was received on 21 Feb 2017, accepted on 24 Mar 2017 and first published on 30 Mar 2017


Article type: Paper
DOI: 10.1039/C7NR01287J
Citation: Nanoscale, 2017,9, 7391-7396
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    Surface passivation of mixed-halide perovskite CsPb(BrxI1−x)3 nanocrystals by selective etching for improved stability

    Q. Jing, M. Zhang, X. Huang, X. Ren, P. Wang and Z. Lu, Nanoscale, 2017, 9, 7391
    DOI: 10.1039/C7NR01287J

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