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Issue 21, 2020
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Synthetic factors affecting the stability of methylammonium lead halide perovskite nanocrystals

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Abstract

Lead halide perovskite nanocrystals (PNCs) have emerged as promising candidates for use in optoelectronic devices. Significant focus has been directed towards optimising synthetic conditions to obtain PNCs with tunable emission properties. However, the reproducible production of stable PNC dispersions is also crucial for fabrication and scale-up of these devices using liquid deposition methods. Here, the stability of methylammonium lead halide (MAPbX3 where X = Br, I) PNCs produced via the ligand-assisted reprecipitation process is explored. We have focussed on understanding how different combinations of specific synthetic factors – dilution, halide source and ratio as well as capping-ligand concentration – affect the stability of the resultant PNC dispersion. Photoluminescence spectroscopy, transmission electron microscopy and dynamic light scattering studies revealed that subtle changes in the reaction conditions lead to significant changes in the particle morphology and associated optical properties, often with catastrophic consequences on stability. This study highlights the importance of designing PNC dispersions in order to make more efficient and reliable optoelectronic devices.

Graphical abstract: Synthetic factors affecting the stability of methylammonium lead halide perovskite nanocrystals

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Supplementary files

Article information


Submitted
24 Apr 2020
Accepted
14 May 2020
First published
22 May 2020

This article is Open Access

Nanoscale, 2020,12, 11694-11702
Article type
Paper

Synthetic factors affecting the stability of methylammonium lead halide perovskite nanocrystals

B. McKenna, A. Shivkumar, B. Charles and R. C. Evans, Nanoscale, 2020, 12, 11694
DOI: 10.1039/D0NR03227A

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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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    [Original citation] - Published by The Royal Society of Chemistry.

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