Abstract
Abstract Carrier mobilities for α-terthienyl (α-3T) have been directly determined by dispersing the oligomer in an inert polycarbonate matrix. Over the temperature and concentration ranges studied, hole mobilities (μ h) are found to increase with applied electric field (F) according to In(μ h)α F 1/2. The results may be successfully analysed using a recently developed theory of hopping within a Gaussian distribution of localized states of energetic width [sgrave]. A comparison of [sgrave] values deduced from the thermal variation of zero-field mobilities ([sgrave] T ), and those calculated from time-of-flight lineshapes ([sgrave] LS), indicates that [sgrave]LS< [sgrave] T , and it is consequently necessary to invoke a self-localization energy E p ≈ 0.45eV for the oxidized oligomer state. Concentration studies subsequently suggest that for dilute doping, where the average inter-oligomer separation distance ρ exceeds 11 A, polaron hopping is non-adiabatic and controlled by wavefunction overlap for which a l...
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