Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
The relaxation of above-gap (‘hot’) carriers is responsible for major efficiency losses in present-day solar cells, and involves a complex interplay between carrier-carrier and carrier-phonon coupling. Unravelling the mechanisms of cooling is therefore an essential step for both understanding and developing emerging photovoltaic materials. Perovskite nanomaterials are an exciting class of compounds because they offer facile and broad optoelectronic tunability by size, dimensionality and composition. Here, we aim to elucidate the effects of these properties on carrier cooling by employing ultrafast pump-push-probe spectroscopy. This three-pulse technique allows cooling to be isolated from a melee of other excited state processes, while also allowing independent control over the hot and cold (band-edge) carrier subpopulations. These experiments show that while carrier cooling is generally indifferent to nanocrystal size in moderately confined systems, intriguing results are obtained upon altering the shape of the nanocrystal, and are also influenced greatly by material composition.
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