Journal article

Visualizing Phase Segregation in Mixed-Halide Perovskite Single Crystals

Wenxin Mao, Christopher R Hall, Anthony SR Chesman, Craig Forsyth, Yi-Bing Cheng, Noel W Duffy, Trevor A Smith, Udo Bach

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | WILEY-V C H VERLAG GMBH | Published : 2019

Abstract

Mixed organolead halide perovskites (MOHPs), CH3 NH3 Pb(Brx I1-x )3 , have been shown to undergo phase segregation into iodide-rich domains under illumination, which presents a major challenge to their development for photovoltaic and light-emitting devices. Recent work suggested that phase-segregated domains are localized at crystal boundaries, driving investigations into the role of edge structure and the growth of larger crystals with reduced surface area. Herein, a method for growing large (30×30×1 μm3 ) monocrystalline MAPb(Brx I1-x )3 single crystals is presented. The direct visualization of the growth of nanocluster-like I-rich domains throughout the entire crystal revealed that grain..

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Grants

Awarded by CSIRO through their OCE Science Leader Fellowship program


Funding Acknowledgements

This work was financially supported by the Australian Research Council Centre of Excellence in Exciton Science. We gratefully acknowledge financial support from the Australian Government through the Australian Renewable Energy Agency and the Australian Centre for Advanced Photovoltaics, CSIRO through their OCE Science Leader Fellowship program (CE170100026 and DP160104575). We also thank Prof. Paul Mulvaney, Dr. Asaph Widmer-Cooper, Dr. Stefano Bernardi, and Dr. Weijian Chen for useful discussions. We also acknowledge use of the facilities and the assistance of Dr. Amelia Liu at the Monash Centre for Electron Microscopy.