Dresden 2020 – wissenschaftliches Programm
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CPP 96.2: Vortrag
Donnerstag, 19. März 2020, 15:15–15:30, ZEU 260
Strongly anisotropic charge transport in crystalline polymer-based materials — •Petros Skopelitis, Michel Panhans, Sebastian Hutsch, Thorsten Arnold, and Frank Ortmann — Center for Advancing Electronics Dresden, TU Dresden, 01062 Dresden
The description of charge transport in polymer materials is complicated by the effect of electron-phonon coupling, electronic anisotropy and uncertain transport mechanism. Here we focus on the relation between intrachain and interchain transport of polymer materials and study crystalline PBTTT-C14 as a model system. We derived an expression for the Kubo formalism that combines coherent and incoherent transport in different directions. The validity of the traditional hopping formula for the mobility is studied and compared to the formula we derived from the Kubo formalism. Various intrinsic aspects of the PBTTT-C14 system are studied and analysed, such as phase coherence, diffusivity and mobility edges. The insights we acquired from the analysis made it possible for us to calculate, within the assumptions of our framework, the transfer integrals in the direction of the alkyl chains in PBTTT-C14, using experimental measurements for conductivity and mobile carrier density as input.