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Facet-Controlled Preparation of Hybrid Perovskite Microcrystals in the Gas Phase and the Remarkable Effect on Optoelectronic Properties

Abstract

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 fundamental material properties and how they are influenced by factors like composition, particle size and shape. Shaping hybrid perovskite particles is not only difficult, 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 CH3NH3PbBr3 crystals with "naked facets". The formation of microcrystals with either predominant (001) facet or the less favorable (011) facet is achieved. We were able to assemble the particles with a defined orientation on a substrate to investigate the facet influence on the optical properties. There is not only pronounced influence on the lifetime of photo-generated charge carriers, but we also find a shift in photoluminescence energy, and, using confocal fluorescence spectroscopy, a facet-dependent local enhancement of fluorescence features. Our study demonstrates that particle shape is an important tool to modify the properties of hybrid perovskites for optoelectronic applications.

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Publication details

The article was received on 04 May 2017, accepted on 06 Jul 2017 and first published on 07 Jul 2017


Article type: Paper
DOI: 10.1039/C7CE00839B
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Facet-Controlled Preparation of Hybrid Perovskite Microcrystals in the Gas Phase and the Remarkable Effect on Optoelectronic Properties

    T. Kollek and S. Polarz, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE00839B

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