Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.262
Publication date: 7th February 2022
Lead halide perovskite absorber materials have attracted enormous attention from academia and industry due to their fascinating optoelectronic characteristics featuring multiple possible applications. In particular, the solution-processed perovskite solar cells demonstrated certified power conversion efficiencies of >25.5% thus coming very close to the best crystalline silicon solar cells. Low operational stability of perovskite solar cells is currently the main obstacle to their practical implementation.
Overcoming stability issues requires a very deep understanding of the compositional and structural dynamics of the perovskite absorber materials under the action of stress factors such as light, heat and electric field. Furthermore, the impact of defects and impurities on such dynamics is of crucial importance. These aspects remain insufficiently investigated, whereas many of the proposed aging pathways are still controversial.
In this lecture, we will discuss compositional and structural inhomogeneities in solution-cast thin films of classical 3D and mixed-dimensional 2D/3D perovskites as revealed by advanced microscopy: SEM, AFM, KPFM and IR s-SNOM. A particular focus will be made on the light-induced phase segregation effects induced by both anion and cation (de)mixing. Furthermore, we will consider typical impurities present in the perovskite absorber films, their localization, effects on the grain boundaries and impact on the operational stability of solar cells.
This work was funded by Russian Science Foundation (project 19-73-30020). PAT also acknowledges the support from EU’s Horizon 2020 ERA-Chair project ExCEED, grant agreement No 952008.
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