Issue 22, 2017

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

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

Supplementary files

Article information

Article type
Paper
Submitted
21 Feb 2017
Accepted
24 Mar 2017
First published
30 Mar 2017

Nanoscale, 2017,9, 7391-7396

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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