Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.140
Publication date: 23rd September 2021
The functional properties of halide perovskite semiconductors at the mirco and nanoscales are heterogeneous,1 and there is a need to understand how these properties (electrical, chemical, etc.)2 affect overall photovoltaic (PV) performance. In this presentation, we begin by showing a variety of nanoscale microscopy methods that have been applied to perovskite solar cells to investigate the local properties of single-junction devices. These results reveal that the charge carrier dynamics in perovskites depend on the incident photon energy 3 and passivated perovskite films can exhibit chemical heterogeneities due to the inclusion of additives that subsequently affect the electrical response in three dimensions.2
Not only are perovskites complex on their own (as a thin film or single-junction device), but when embedded within a textured multi-junction solar cell, the interplay between device architecture and material performance introduces new challenges. It is not well understood how the local light-matter interactions of the perovskite material behave when incorporated into this type multijunction configuration. Therefore, we present optoelectronic microscopy measurements correlated with optical simulations of perovskite on textured c-Si solar cells. We measure the photon out-coupling of the perovskite material and find both a spectral and spatial dependence on the geometrical patterning which dominates any grain-to-grain variation.4 Such heterogeneity reveals the importance of the underlying c-Si texture design, suggesting that tuning the surface morphology could lead to a homogenization of the perovskite’s PL emission.
I would like to thank the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement no. 841265, as well as funding from the Engineering and Physical Sciences Research Council (EP/R023980/1), the EPSRC “Centre for Advanced Materials for Integrated Energy Systems (CAM-IES)” EP/ P007767/1, and Cambridge Royce facilities grant EP/ P024947/1.
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