Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.052
Publication date: 11th July 2022
Halide perovskite semiconductors are generating enormous excitement for next-generation photovoltaics in both single junction and tandem device forms. Their performance is striking given that these absorber layers are rife with heterogeneity on the nanoscale in their structural, chemical and optoelectronic properties. Here, I will describe how this heterogeneity impacts not just performance but also operational stability of halide perovskite solar cells. Nanoscale trap clusters are present in the absorber layers that act as unwanted non-radiative recombination sites [1] and sites of instability [2] -- and thus must be removed. These trap clusters relate to phase impurities [3] and form in regions that are not stabilised by octahedral tilt [4]. Furthermore, interfaces impact local recombination and instability pathways, both on a local scale and on a macroscopic scale. I will outline how appropriate passivation and compositional control can mitigate these issues, and provide a pathway to realise highly efficient and stable perovskite solar cells.