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Crystallographic orientation propagation in metal halide perovskite thin films

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Abstract

Metal halide perovskites have achieved remarkable efficiency in solar cells. However, the origin and impact of preferential crystallographic orientation of thin films are still not well understood. In this work, using in situ grazing-incidence X-ray scattering, we show that a preferential crystallographic orientation of a thin ‘seed’ layer (∼65 nm) on top of a thick (∼350 nm) randomly oriented film can propagate through the entire film. The thin cubic (100) oriented layer on top was formed by using a simple solution based treatment with methylammonium chloride (MACl) on randomly oriented methylammonium lead iodide (MAPbI3) films. Upon thermal annealing, the cubic (100) orientation propagates through the entire MAPbI3 film underneath which eventually cools down to tetragonal (110) orientation at room temperature. The treatment results in significantly improved solar cell power conversion efficiency, highlighting the importance of controlling the crystallographic orientation of grains.

Graphical abstract: Crystallographic orientation propagation in metal halide perovskite thin films

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Publication details

The article was received on 12 Mar 2017, accepted on 07 Apr 2017 and first published on 11 Apr 2017


Article type: Communication
DOI: 10.1039/C7TA02203D
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Crystallographic orientation propagation in metal halide perovskite thin films

    A. Z. Chen, B. J. Foley, J. H. Ma, M. R. Alpert, J. S. Niezgoda and J. J. Choi, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA02203D

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