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The Influence of Water Vapor on the Stability and Processing of Hybrid Perovskite Solar Cells Made from Non‐Stoichiometric Precursor Mixtures

Lookup NU author(s): Dr Pablo Docampo

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Abstract

We investigated the influence of moisture on CH₃NH₃PbI₃ perovskite films and solar cells derived from non-stoichiometric precursor mixtures. We followed both the structural changes under controlled air humidity viain-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 lead and iodine. In contrast, the MAI-excess films composed of smaller perovskite crystals showed increased electronic disorder and reduced device performance due to poor charge collection. Upon exposure to moisture followed by dehydration (“solvent annealing”), these films recrystallized to form larger, highly oriented crystals with fewer electronic defects and a remarkable improvement in photocurrent and photovoltaic efficiency.

Publication metadata

Author(s): Petrus ML, Hu Y, Moia D, Calado P, Leguy A, Barnes PRF, Docampo P

Publication type: Article

Publication status: Published

Journal: ChemSusChem

Year: 2016

Volume: 9

Issue: 18

Pages: 2699-2707

Print publication date: 22/09/2016

Online publication date: 14/09/2016

Acceptance date: 14/09/2016

Date deposited: 28/09/2016

ISSN (print): 1864-5631

ISSN (electronic): 1864-564X

Publisher: Wiley

URL: http://dx.doi.org/10.1002/cssc.201600999

DOI: 10.1002/cssc.201600999

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