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Lookup NU author(s): Dr Pablo Docampo
Efficient perovskite solar cells can be produced by a wide variety of different methods. Previous results show that controlling the film morphology is critical to enhance the efficiency of the prepared devices. Here, grazing-incidence wide-angle X-ray scattering (GIWAXS) is used to study the morphology and especially the orientation distribution of CH3NH3PbI3 (MAPI) perovskite films prepared by five typical methods. We find that the investigated one-step methods produce non-oriented films, while the two-step deposition methods produce varying degrees of orientation depending on the method chosen to convert the highly oriented PbI2 precursor, providing direct evidence for different perovskite conversion mechanisms. In particular, we show that the morphology and crystal orientation of MAPI films is tunable by varying the spin-coating temperature and by adding chloride to the conversion solution. By relating the precursor morphology to the resulting MAPI film morphology, we link the observed preferential orientations to specific conversion mechanisms, thereby establishing GIWAXS as an important tool toward a rational development of new synthesis methods.
Author(s): Oesinghaus L, Schlipf J, Giesbrecht N, Song L, Hu Y, Bein T, Docampo P, Müller-Buschbaum P
Publication type: Article
Publication status: Published
Journal: Advanced Materials Interfaces
Year: 2016
Volume: 3
Issue: 19
Print publication date: 06/10/2016
Online publication date: 11/08/2016
Acceptance date: 11/08/2016
Date deposited: 02/11/2016
ISSN (electronic): 2196-7350
Publisher: Wiley - V C H Verlag GmbH & Co. KGaA
URL: http://dx.doi.org/10.1002/admi.201600403
DOI: 10.1002/admi.201600403
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