Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 27th March 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 29, 2018
Previous Article Next Article

Correlating nano black spots and optical stability in mixed halide perovskite quantum dots

Author affiliations

Abstract

Lead trihalide perovskite nanomaterials are widely studied due to their remarkable optoelectronic properties. Despite their outstanding and demonstrated potential, these materials have been kept from practical application due to their crippling instability in ambient conditions. From electron microscopy studies of this series of quantum dots (QDs) we demonstrate that the onset of degradation in optical properties coincides with the appearance of nano black spots (NBSs) on the QDs. Elemental mapping using electron microscopy revealed the NBSs to be areas with higher concentration of lead. We have looked at the possible mechanisms to explain NBSs and found that they may arise due to two very different pathways. The first one is due to crystal growth initiated by excess reactants and the second is due to chemical degradation of the QD surface. Further we have invoked the well known geometrical stability criterion for perovskites, Goldschmidt's tolerance factor to predict the appearance of NBSs and the onset of optical instability of CsPbBr3−xIx QDs. This correlation can be used as a criterion to aid the selection of more optically stable perovskite QDs for practical applications.

Graphical abstract: Correlating nano black spots and optical stability in mixed halide perovskite quantum dots

Back to tab navigation

Supplementary files

Publication details

The article was received on 02 Mar 2018, accepted on 29 Jun 2018 and first published on 11 Jul 2018


Article type: Paper
DOI: 10.1039/C8TC01040D
Citation: J. Mater. Chem. C, 2018,6, 7803-7813

  •   Request permissions

    Correlating nano black spots and optical stability in mixed halide perovskite quantum dots

    Y. Ko, P. Prabhakaran, M. Jalalah, S. Lee, K. Lee and J. Park, J. Mater. Chem. C, 2018, 6, 7803
    DOI: 10.1039/C8TC01040D

Search articles by author

Spotlight

Advertisements