Dendritic molecules demonstrate a broad variety of transfer processes under different geometric and coupling regimes, which can be utilized in photovoltaic applications. In this work, coherent energy and charge transfer processes were investigated in different oligothiophene dendritic systems functionalized with diketopyrrolopyrrole (DPP) groups. Time-resolved spectroscopy in solution and two-photon interferometric near-field microscopy in the solid-phase have allowed us to compare coherent transport properties in solution and in organic films with high time (~50 fs) and space resolution (~40 nm). For the first time, high-resolution time-resolved spectroscopy and interferometric microscopy techniques have been compared to investigate ultrafast coherent dynamics. Investigation of coherent dynamics in photovoltaic organic materials is important as related to longer exciton diffusion length and to power conversion efficiency. Optical excitation dynamics with fast time resolution and high spatial resolution have been investgated to better underestand the local transport dynamics in these systems. Interferometric near-field optical microscopy allows to monitor fast coherent processes in the excited state at nanoscale resolution.<br/>Differences in the excited state coherent dynamics have been found in films compared to solution phase. Interestingly, the dendron structure has shown higher charge delocalization in the solid-phase due to stronger intra- and inter-molecular couplings contribution compared to the dendrimer system. We believe that these findings could be used to better understand and to improve the potential of this promising class of organic macromolecules for light harvesting applications.

Coherent energy and charge transport processes in oligothiophene dendrimers probed in solution and in the solid state with time-resolved spectroscopy and microscopy methods

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.