Charge-carrier transport in a paradigmatic semicrystalline polymer semiconductor (P3HT) is important for both fundamental understanding and applications. In samples with enhanced structural disorder due to ad-hoc point defects, the mobility displays rich behavior as a function of electric field (F) and temperature (T ). At low T , the mobility increases with the applied field but upon further increasing T, the field-dependence becomes shallower. Eventually, at the highest T considered, the slope changes sign and the mobility then decreases with the field. This phenomenon can be interpreted with our model as a result of the competition between intra-chain conductive-like transport (which slows down on increasing F) and interchain activated transport (which is faster at higher F). The former is controlling at high T where inter-chain hops are strictly limited to nearest-neighbour monomers on adjacent chains. At low-T, instead, inter-chain hops to distant sites are allowed and control the positive correlation of the mobility with the field.
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