Oxygen Degradation in Mesoporous Al2O3/CH3NH3PbI3‐xClx Perovskite Solar Cells: Kinetics and Mechanisms

Advanced Energy Materials - Tập 6 Số 13 - 2016
Andrew J. Pearson1, Giles E. Eperon2,3, Paul E. Hopkinson4,5, Severin N. Habisreutinger2, Jacob Tse‐Wei Wang2, Henry J. Snaith2, Neil C. Greenham1
1Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK
2Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
3Present Address: Department of Chemistry, University of Washington Seattle, Washington 98195, United States.
4Centre for Advanced Materials Universität Heidelberg Heidelberg 69120 Germany
5Kirchhoff‐Institut für Physik Universität Heidelberg Heidelberg 69120 Germany

Tóm tắt

The rapid pace of development for hybrid perovskite photovoltaics has recently resulted in promising figures of merit being obtained with regard to device stability. Rather than relying upon expensive barrier materials, realizing market‐competitive lifetimes is likely to require the development of intrinsically stable devices, and to this end accelerated aging tests can help identify degradation mechanisms that arise over the long term. Here, oxygen‐induced degradation of archetypal perovskite solar cells under operation is observed, even in dry conditions. With prolonged aging, this process ultimately drives decomposition of the perovskite. It is deduced that this is related to charge build‐up in the perovskite layer, and it is shown that by efficiently extracting charge this degradation can be mitigated. The results confirm the importance of high charge‐extraction efficiency in maximizing the tolerance of perovskite solar cells to oxygen.

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Advanced Energy Materials

Tập 6 Số 13

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