Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Solar cell devices based on the perovskite methylammonium lead iodide (MAPbI3) have become a key light harvesting element showing excitingly high photo-conversion efficiencies. To account for key features responsible for such performances, not only electronic, but also ionic transport properties of MAPbI3 need to be considered. In addition, ion transport is known to be relevant for the degradation kinetics of most materials. To measure and separate these transport contributions not only in the dark, but also under illumination, we performed electrochemical studies by using various techniques such as transference number measurements, Faradaic experiments, permeation studies, stoichiometric variations, Hall effect experiments and the use of blocking electrodes. As a result we report, for the first time, a clear enhancement of the ionic conductivity by more than 2 orders of magnitude in MAPbI3 upon illumination.[3] Furthermore, we discuss these striking findings in the context of defect chemical models and transport experiments previously reported by our group.[2,3] Based on these experimental results, we also propose a mechanism for the photo-enhanced ion conduction. As a last point, we show that this surprising effect leads to a previously unconsidered decomposition path for MAPbI3 and related compounds.
References
[1] G. Y. Kim, A. Senocrate, T. –Y. Yang, G. Gregori, M. Grätzel, J. Maier, Nature Mater. (2018), doi:10.1038/s41563-018-0038-0.
[2] T. -Y. Yang, G. Gregori, N. Pellet, M. Grätzel, J. Maier, Angew. Chemie Int. Ed. (2015), 54, 7905–7910.
[3] A. Senocrate, I. Moudrakovski, G. Y. Kim, T. –Y. Yang, G. Gregori, M. Grätzel, J. Maier, Angew. Chemie Int. Ed. (2017), 56, 1-6.
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