Issue 4, 2018

Surface engineering for improved stability of CH3NH3PbBr3 perovskite nanocrystals

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

Supplementary files

Article information

Article type
Paper
Submitted
03 sep. 2017
Accepted
14 dic. 2017
First published
14 dic. 2017

Nanoscale, 2018,10, 1885-1891

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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