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Modeling p-type charge transport in thienoacene analogs of pentacene

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Abstract

The charge transport properties of two fused-ring thienoacenes, (a) the syn-isomer of dibenzo-thieno-dithiophene (DBTDT), packing in the solid state with a π–π stacking arrangement and also known as bis-benzo-thieno-thiophene (BBTT) and (b) C6-DBTDT, an alkylated derivative, packing in the more conventional herring-bone arrangement, are investigated computationally in the framework of the non-adiabatic hopping mechanism. Charge transfer rate constants are computed within the Marcus–Levich–Jortner formalism including a single effective mode treated quantum mechanically and are injected in a kinetic Monte Carlo scheme to propagate the charge carrier in the crystal. Charge mobilities are computed at room temperature with and without the influence of an electric field and are shown to compare very well with the measured mobilities in single-crystal devices. Both systems show an almost 1D charge transport with C6-DBTDT displaying about a ten times larger mobility value, in agreement with experiment. It is shown that the role of the HOMO-1 orbital is not relevant for BBTT, while it might contribute to a more marked 2D charge transport character for C6-DBTDT.

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Correspondence to Fabrizia Negri.

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Published as part of the special collection of articles “CHITEL 2015 - Torino - Italy”.

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Canola, S., Pecoraro, C. & Negri, F. Modeling p-type charge transport in thienoacene analogs of pentacene. Theor Chem Acc 135, 33 (2016). https://doi.org/10.1007/s00214-015-1757-9

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  • DOI: https://doi.org/10.1007/s00214-015-1757-9

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