However, comparing with results where the proton is attached in position 2 * , which is equivalent to position 2 but is further away from the edge of the oligomer modelled, we find very similar electronic behavior as in Proton-1 with a positive polaron induced in the center of the PCPDT-BT conjugated chain. Therefore, we conclude that polaron formation in Proton-2 is mostly hindered by the nearby edge of the oligomer modelled, which would be a very rare case to occur in experiments with long polymer chains. The precise positioning of the proton in the donor unit and relative positioning to the adjacent acceptor unit appears to have only little influence on the polaron formation.