Influence of the orientation of methylammonium lead iodide perovskite crystals on solar cell performance

Docampo, P. , Hanusch, F. C., Giesbrecht, N., Angloher, P., Ivanova, A. and Bein, T. (2014) Influence of the orientation of methylammonium lead iodide perovskite crystals on solar cell performance. APL Materials, 2(8), 081508. (doi: 10.1063/1.4890244)

Abstract

Perovskite solar cells are emerging as serious candidates for thin film photovoltaics with power conversion efficiencies already exceeding 16%. Devices based on a planar heterojunction architecture, where the MAPbI3 perovskite film is simply sandwiched between two charge selective extraction contacts, can be processed at low temperatures (<150 °C), making them particularly attractive for tandem and flexible applications. However, in this configuration, the perovskite crystals formed are more or less randomly oriented on the surface. Our results show that by increasing the conversion step temperature from room temperature to 60 °C, the perovskite crystal orientation on the substrate can be controlled. We find that films with a preferential orientation of the long axis of the tetragonal unit cell parallel to the substrate achieve the highest short circuit currents and correspondingly the highest photovoltaic performance.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Docampo, Dr Pablo
• Authors: Docampo, P., Hanusch, F. C., Giesbrecht, N., Angloher, P., Ivanova, A., and Bein, T.
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: APL Materials
• Publisher: AIP Publishing
• ISSN: 2166-532X
• ISSN (Online): 2166-532X
• Published Online: 25 July 2014
• Copyright Holders: Copyright © 2014 The Authors
• First Published: First published in APL Materials 2(8): 081508
• Publisher Policy: Reproduced under a Creative Commons License