TY - JOUR

T1 - Facet-controlled preparation of hybrid perovskite microcrystals in the gas phase and the remarkable effect on optoelectronic properties

AU - Kollek, T.

AU - Polarz, S.

N1 - Funding Information: We thank the Baden-Wurttemberg Foundation for financial support (project SUPERSOL; program Biomimetic Materials Synthesis) and the collaborative research center SFB1214 (Anisotropic Particles as Building Blocks: Tailoring Shape, Interactions and Structures) which is financed by the DFG. Publisher Copyright: © 2017 The Royal Society of Chemistry. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.

PY - 2017

Y1 - 2017

N2 - Within only a few years, hybrid perovskites have become one of the most intriguing semiconductors in different light-harvesting and light-emitting applications. Their optimization for targeting technological implementation can only be achieved if one gathers knowledge of their fundamental material properties and how they are influenced by factors like composition, particle size, and shape. Not only is shaping hybrid perovskite particles difficult, but capping agents binding to crystal surfaces might influence the intrinsic properties as well. We present a new aerosol-assisted crystallization with a liquid single-source precursor for making shaped CH 3NH 3PbBr 3 crystals with "naked facets". The formation of microcrystals with either predominant (001) facets or the less favorable (011) facets is achieved. We were able to assemble the particles in a defined orientation on a substrate to investigate the facet influence on the optical properties. We find not only a pronounced influence on the lifetime of the photo-generated charge carriers, but also a shift in the photoluminescence energy, and, using confocal fluorescence spectroscopy, a facet-dependent local enhancement of the fluorescence features. Our study demonstrates that the particle shape is an important tool to modify the properties of hybrid perovskites for optoelectronic applications.

AB - Within only a few years, hybrid perovskites have become one of the most intriguing semiconductors in different light-harvesting and light-emitting applications. Their optimization for targeting technological implementation can only be achieved if one gathers knowledge of their fundamental material properties and how they are influenced by factors like composition, particle size, and shape. Not only is shaping hybrid perovskite particles difficult, but capping agents binding to crystal surfaces might influence the intrinsic properties as well. We present a new aerosol-assisted crystallization with a liquid single-source precursor for making shaped CH 3NH 3PbBr 3 crystals with "naked facets". The formation of microcrystals with either predominant (001) facets or the less favorable (011) facets is achieved. We were able to assemble the particles in a defined orientation on a substrate to investigate the facet influence on the optical properties. We find not only a pronounced influence on the lifetime of the photo-generated charge carriers, but also a shift in the photoluminescence energy, and, using confocal fluorescence spectroscopy, a facet-dependent local enhancement of the fluorescence features. Our study demonstrates that the particle shape is an important tool to modify the properties of hybrid perovskites for optoelectronic applications.

UR - http://www.scopus.com/inward/record.url?scp=85027271398&partnerID=8YFLogxK

U2 - 10.1039/c7ce00839b

DO - 10.1039/c7ce00839b

M3 - Article

VL - 19

SP - 4615

EP - 4621

JO - CRYSTENGCOMM

JF - CRYSTENGCOMM

SN - 1466-8033

IS - 31

ER -