The Influence of Water Vapor on the Stability and Processing of Hybrid Perovskite Solar Cells Made from Non-Stoichiometric Precursor Mixtures.
ChemSusChem
; 9(18): 2699-2707, 2016 Sep 22.
Article
em En
| MEDLINE
| ID: mdl-27624589
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 inâ
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.
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01-internacional
Base de dados:
MEDLINE
Assunto principal:
Óxidos
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Fontes de Energia Elétrica
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Energia Solar
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Vapor
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Titânio
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Compostos de Cálcio
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article