We find that the calculated mobilities are comparable to the experimentally measured values (𝜇 𝑒𝑥𝑝 ~1 -10 cm 2 /Vs) for polymers with high 〈𝜇〉; these high-mobility polymers primarily consist of fused aromatic rings and the average length of the structural repeating unit per monomer (𝑙 𝑆𝑅𝑈 ) is mostly ≥ 8 Å (see Fig. ; indacenodithiophene (IDT) and cyclopentadithiophene (CDT) based copolymers also have disordered microstructures in the bulk). However, the experimentally observed mobilities are much larger than the calculated ones for polymers with low 〈𝜇〉. It is likely that for polymers that reside at the lower end of the computed mobility values, inter-chain hopping has to be considered within the transport model which has been ignored in the present model. In connection, we also observe that majority of the polymers in this latter category usually form large aggregates in the bulk with significant intermolecular 𝜋 -𝜋 stacking between polymer chains , and therefore, inter-chain hopping may be as frequent as of intra-chain hopping in these systems.