Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.044
Publication date: 23rd September 2021
A number of empirical additive and surface passivation treatments have been reported to improve the performance and stability of halide perovskite semiconductors. However, our mechanistic understanding of how these treatments affect the perovskite structures if often lagging, in part due to the wide range of perovskite formulations and growth conditions in use. We explore the effects of difference treatments on several different perovskite formulations, from the role of large A-site cations, to Lewis bases, and protonated forms of basic species. Using hyperspectral photoluminescence and nano-infrared microscopy, we show that compositional heterogeneity is ubiquitous in many perovskite formulations and that this compositional heterogeneity is in turn influenced by multiple surface treatment routes. Ultimately, we demonstrate surface recombination velocities < 10 cm/s and show that we can preserve high quality interfaces even in contact with electron and hole extraction layers.
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