The Influence of Water Vapor on the Stability and Processing of Hybrid Perovskite Solar Cells Made from Non-Stoichiometric Precursor Mixtures
File(s)
Author(s)
Type
Journal Article
Abstract
We investigated the influence of moisture on methylammonium lead iodide perovskite (MAPbI3) films and solar cells derived from non-stoichiometric precursor mixtures. We followed both the structural changes under controlled air humidity through in situ X-ray diffraction, and the electronic behavior of devices prepared from these films. A small PbI2 excess in the films improved the stability of the perovskite compared to stoichiometric samples. We assign this to excess PbI2 layers at the perovskite grain boundaries or to the termination of the perovskite crystals with Pb and I. In contrast, the MAI-excess films composed of smaller perovskite crystals showed increased electronic disorder and reduced device performance owing to poor charge collection. Upon exposure to moisture followed by dehydration (so-called solvent annealing), these films recrystallized to form larger, highly oriented crystals with fewer electronic defects and a remarkable improvement in photocurrent and photovoltaic efficiency.
Date Issued
2016-09-14
Date Acceptance
2016-09-01
Citation
Chemsuschem, 2016, 9 (18), pp.2699-2707
ISSN
1864-564X
Publisher
Wiley
Start Page
2699
End Page
2707
Journal / Book Title
Chemsuschem
Volume
9
Issue
18
Copyright Statement
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the accepted version of the following article: M. L. Petrus, Y. Hu, D. Moia, P. Calado, A. M. A. Leguy, P. R. F. Barnes, P. Docampo, ChemSusChem 2016, 9, 2699., which has been published in final form at http://dx.doi.org/10.1002/cssc.201600999.
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Grant Number
EP/J002305/1
Subjects
Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Chemistry
Science & Technology - Other Topics
non-stoichiometric
perovskite
solar cells
stability
water vapor
CH3NH3PBI3 PEROVSKITE
HIGH-PERFORMANCE
DEGRADATION
EFFICIENCY
HUMIDITY
FILMS
IODIDE
PASSIVATION
DEPOSITION
EXPOSURE
Organic Chemistry
0399 Other Chemical Sciences
Publication Status
Published