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Departamento de Física de la Materia Condensada

Seminario: "Transient Microscopy: Visualizing the Flow of Energy"

Transient Microscopy: Visualizing the Flow of Energy
Dpto. de Física de la Materia Condensada
Prof. Ferry Prins. Facultad de Ciencias, UAM
Evento online, MS-TEAMS, “Seminarios del Departamento”

Energy transport plays a central role in all of light harvesting and light emitting technologies. Understanding how material properties affect the flow of energy requires a careful evaluation of the local energetic landscape and structural morphology. This challenge has become particularly relevant with the emergence of increasingly efficient nanostructured semiconductors, which are characterised by complex morphologies and exhibit greatly varying degrees of energetic and structural disorder. Moreover, mobile energy carriers in these materials can take on many forms, including free charges, bound electron-hole pairs (i.e. excitons), and thermal transport through phonon modes. To capture the complexity of energy transport in these systems, new tools that can correlate the structural diversity with energy transport characteristics are needed.

In this talk I will highlight the recent development of transient microscopy techniques1,2, capable of directly visualizing excited state energy transport with high spatial (few nanometers) and temporal (sub-nanosecond) resolution. Thanks to this development, a rich variety of deviations from conventional diffusion has already been revealed, providing detailed information on the influence of structural features on the local energy transport characteristics.3 In the second part of the talk, I will present our own most recent contribution to this field where we use transient microscopy to measure the exciton transport characteristics in layered metal-halide perovskites.4

1. Akselrod, Prins, Poulikakos, Lee, Weidman et al. Nano Letters, 2014, 14, 3556

2. Akselrod, Deotare, Thomspson, Lee, Tisdale et al. Nature Communications, 2014, 5, 3646

3. Ginsberg and Tisdale, Ann. Rev. Phys. Chem. , 2020, 71, 1-30

4. Seitz, Magdaleno, Alcazar-Cano, Melendez, Lubbers et al. Nature Communications, 2020, 11, 2035


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