Petrus, M. L., Hu, Y., Moia, D., Calado, P., Leguy, A. M. A., Barnes, P. R. F. and Docampo, P. (2016) The influence of water vapor on the stability and processing of hybrid perovskite solar cells made from non-stoichiometric precursor mixtures. Chemsuschem, 9(18), pp. 2699-2707. (doi: 10.1002/cssc.201600999) (PMID:27624589)
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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.
| Item Type: | Articles |
|---|---|
| Additional Information: | The authors acknowledge Dr. Steffen Schmidt for the preparation of the SEM images and Prof. Thomas Bein and Johannes Schlipf for valuable discussions. The authors acknowledge funding from the German Federal Ministry of Education and Research (BMBF) under the agreement number 0SF0516B, the Bavarian Ministry of the Environment and Consumer Protection, the Bavarian Network “Solar Technologies Go Hybrid”, and the DFG Excellence Cluster Nanosystems Initiative Munich (NIM). P.D. acknowledges support from the European Union through the award of a Marie Curie Intra‐European Fellowship. P.C., D.M., and P B. are grateful to the UK Engineering and Physical Sciences Research Council for financial support (grants EP/J002305/1, EP/M025020/1, EP/G037515/1 and EP/M014797/1). Special Issue: Stability of Perovskite Solar Cells & Devices |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Docampo, Dr Pablo |
| Authors: | Petrus, M. L., Hu, Y., Moia, D., Calado, P., Leguy, A. M. A., Barnes, P. R. F., and Docampo, P. |
| College/School: | College of Science and Engineering > School of Chemistry |
| Journal Name: | Chemsuschem |
| Publisher: | Wiley |
| ISSN: | 1864-5631 |
| ISSN (Online): | 1864-564X |
| Published Online: | 14 September 2016 |
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