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Issue 17, 2017
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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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Supplementary files

Article information


Submitted
12 Mar 2017
Accepted
07 Apr 2017
First published
11 Apr 2017

J. Mater. Chem. A, 2017,5, 7796-7800
Article type
Communication

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, 5, 7796
DOI: 10.1039/C7TA02203D

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