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Issue 4, 2018
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Surface engineering for improved stability of CH3NH3PbBr3 perovskite nanocrystals

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Abstract

Organohalide perovskite nanocrystals (NCs) with a variety of nano-scale structures and morphologies have shown promising potential owing to their size- and composition-dependent optoelectronic properties. Despite extensive studies on their size-dependent optical properties, a lack of understanding on their morphological transformation and the relevant stability issues limits a wide range of applications. Herein, we hypothesize a mechanism for the morphological transformation of perovskite NCs, which leads to dissolving NCs and forming microscale rectangular grains, resulting in a reduction of photoluminescence. We found that the morphological transformation from nanocrystal solids to microscale rectangular solids occurs via Ostwald ripening. A surface treatment with a surfactant suppresses the transformation, resulting in nearly monodisperse NCs with a square shape (∼20 nm edge size), and thus improves the stability of NC solution, as well as their photoluminescence performance and quantum yield (PLQY = 82%). Furthermore, we employed similar amine derivatives to investigate the effect of a molecular architecture (i.e. steric hindrance) on perovskite NC stability, which exhibited much enhanced PLQY (93%). These experimental results provide new insights into the fundamental relationship between the physical properties and the structure of perovskite nanocrystals required to understand their diverse optoelectronic properties.

Graphical abstract: Surface engineering for improved stability of CH3NH3PbBr3 perovskite nanocrystals

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Publication details

The article was received on 03 Sep 2017, accepted on 14 Dec 2017 and first published on 14 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR06547G
Citation: Nanoscale, 2018,10, 1885-1891
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    Surface engineering for improved stability of CH3NH3PbBr3 perovskite nanocrystals

    A. Kirakosyan, S. Yun, S. Yoon and J. Choi, Nanoscale, 2018, 10, 1885
    DOI: 10.1039/C7NR06547G

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