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The performance of organic semiconductor devices is linked to highly-orderednanostructures of self-assembled molecules and polymers. We employ many-bodyperturbation theory and study the excited states in bulk compolymers. Wediscover that acceptors in the polymer scaffold introduce a, hithertounrecognized, conduction impurity band. The donor units are surrounded byconjugated bands which are only mildly perturbed by the presence of acceptors.Along the polymer axis, mutual interactions among copolymer strands hinderefficient band transport, which is, however, strongly enhanced acrossindividual chains. We find that holes are most effectively transported in the$\pi-\pi$ stacking while electrons in the impurity band follow the edge-to-edgedirections. The copolymers exhibit regions with inverted transport polarity, inwhich electrons and holes are efficiently transported in mutually orthogonaldirections.

Quasiparticles and Band Transport in Organized Nanostructures of Donor-Acceptor Copolymers