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

Pablo Docampo, Fabian C. Hanusch, Nadja Giesbrecht, Philipp Angloher, Alesja Ivanova, Thomas Bein

Research output: Contribution to journalArticleResearchpeer-review

78 Citations (Scopus)

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.

Original languageEnglish
Article number081508
Number of pages6
JournalAPL Materials
Volume2
Issue number8
DOIs
Publication statusPublished - 25 Jul 2014
Externally publishedYes

Cite this