Visualizing Phase Segregation in Mixed-Halide Perovskite Single Crystals.

Autor: Mao W; Department of Chemical Engineering, Monash University, Clayton, Victoria, Australia.; Australian Research Council Centre of Excellence in Exciton Science, Australia., Hall CR; Australian Research Council Centre of Excellence in Exciton Science, Australia.; School of Chemistry, University of Melbourne, Parkville, Victoria, 3010, Australia., Chesman ASR; Australian Research Council Centre of Excellence in Exciton Science, Australia.; CSIRO Manufacturing, Clayton, Victoria, Australia.; Melbourne Centre for Nanofabrication, Victoria, Australia., Forsyth C; School of Chemistry, Monash University, Clayton, Victoria, Australia., Cheng YB; Australian Research Council Centre of Excellence in Exciton Science, Australia.; Department of Materials and Science Engineering, Monash University, Clayton, Victoria, 3800, Australia., Duffy NW; CSIRO Energy, Clayton, Victoria, Australia., Smith TA; Australian Research Council Centre of Excellence in Exciton Science, Australia.; School of Chemistry, University of Melbourne, Parkville, Victoria, 3010, Australia., Bach U; Department of Chemical Engineering, Monash University, Clayton, Victoria, Australia.; Australian Research Council Centre of Excellence in Exciton Science, Australia.; Melbourne Centre for Nanofabrication, Victoria, Australia.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2019 Feb 25; Vol. 58 (9), pp. 2893-2898. Date of Electronic Publication: 2019 Jan 18.
DOI: 10.1002/anie.201810193
Abstrakt: Mixed organolead halide perovskites (MOHPs), CH 3 NH 3 Pb(Br x I 1-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 μm 3 ) monocrystalline MAPb(Br x I 1-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 boundaries are not required for this transformation. Narrowband fluorescence imaging and time-resolved spectroscopy provided new insight into the nature of the phase-segregated domains and the collective impact on the optoelectronic properties.
(© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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