Long-range exciton transport is a key challenge in achieving efficient solar energy harvesting in both organic solar cells and photosynthetic systems. Self-assembled molecular aggregates provide the potential for attaining long-range exciton transport through strong intermolecular coupling. However, there currently lacks an experimental tool to directly characterize exciton transport in space and in time to elucidate mechanisms. Here we report a direct visualization of exciton diffusion in molecular aggregates by transient absorption microscopy with ~ 200 fs time resolution and ~ 50 nm spatial precision. The methods presented here establish a direct approach for unraveling the mechanisms and main parameters underlying exciton transport in large molecular assemblies.

Direct imaging of exciton transport in molecular aggregates by ultrafast microscopy

2019 Fall National Meeting

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