Nanoscale heterogeneity in halide perovskites: the good, the bad and the ugly
Samuel Stranks a
a University of Cambridge, JJ Thomson Avenue, Cambridge, United Kingdom
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Keynote, Samuel Stranks, presentation 020
Publication date: 20th April 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 delve into these nanoscale features by presenting recent works employing multimodal microscopy techniques to understand relationships between these properties, and their link to device performance and stability. I will give examples where we find the heterogeneity beneficial for performance, where chemical heterogeneity is able to funnel charge carriers away from deep traps [1]. However, nanoscale trap clusters are present in these absorbers that act as unwanted non-radiative recombination sites [2] and sites of instability (arXiv:2107.09549) -- 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]. This interplay between the good, the bad and the ugly -- and appropriate management of these effects -- will dictate commercial prospects of these promising technologies.



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