Lundi 11 avril 2022 à 11 h.
INSP – Sorbonne Université – 4 place Jussieu – 75005 Paris – Barre 12-22, 4e étage, salle 426
Akshay Rao (Cavendish Laboratory, University of Cambridge)
Abstract
The performance of devices based on next-generation electronic and energy materials is underpinned by the dynamics and transport of particles and quasi-particles such as electrons and holes, excitons and ions. Understanding how transport occurs in these often disorder materials is a major scientific challenge, which can provide both fundamental insights but also holds the promise to improve device performance far above current levels. In this talk I will introduce some of our recent efforts in the area of time-resolved optical microscopy, with which we can now track excited states in 3D with temporal resolution below 10fs and spatial precision below 5nm. This opens a new window into the direct observation of quantum transport across a range of materials. I will highlight recent results including evidence for room temperature exciton condensates in the excitonic insulator Ta2NiSe5, coherent charge transport in metal halide perovskites and new energy transport regimes in molecular semiconductors. I will also briefly touch upon our work using optical scatting microscopy for the operando tracking of ion dynamics in battery electrodes.
References
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6. Zhang et al., Nature Materials, 2022, DOI: 10.1038/s41563-022-01204-6
