Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.240
Publication date: 18th July 2019
Lead halide perovskites are mixed ionic and electronic semiconductors.1, 2 Whilst the electronic properties have been characterized early on in this emerging photovoltaic field the actual role of migrating ions still remains under debate.3 In this presentation, it is described how migrating ions can totally modify the charge carrier injection/extraction properties of the external contacts. It will be shown that under an applied electrical field ions migrate in single crystal MAPbBr3 and they react with Au leading to formation of gold halides as detected by XPS and Raman spectroscopy.4 Alternatively, the J-V response is totally modified as a consequence of the change in the injection barriers. The behavior/chemical reaction is reversible and is connected with the hysteresis observed during J-V cycling. Similarly, non-desired recombination pathways can be avoided by the presence of extrinsic ions like Li+ or K+ that may be introduced at the external contacts.5 The kinetics of formation of the ionic double layer seems to be at the heart of the chemical reactivity as detected by impedance spectroscopy.6
A.G. thanks financial support by Ministerio de Ciencia, Innovación y Universidades of Spain under project (MAT2016-76892-C3-1-R) and MICINN for a Ramón y Cajal Fellowship (RYC-201416809). University Jaume I is also acknowledged for financial support (UJI-B2017-32).
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