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Electron coupling to intra- and inter-molecular vibrational modes isinvestigated in models appropriate to single crystal organic semiconductors,such as oligoacenes. Focus is on spectral and transport properties of thesesystems beyond perturbative approaches. The interplay between differentcouplings strongly affects the temperature band renormalization that is theresult of a subtle equilibrium between opposite tendencies: band narrowing dueto interaction with local modes, band widening due to electron coupling to nonlocal modes. The model provides an accurate description of the mobility asfunction of temperature: indeed, it has the correct order of magnitude, at lowtemperatures, it scales as a power-law $T^{-\delta}$ with the exponent $\delta$larger than unity, and, at high temperatures, shows an hopping behavior with asmall activation energy.

Effects of electron coupling to intra- and inter-molecular vibrational modes on the transport properties of single crystal organic semiconductors