shows that an optimized doping state is crucial to guarantee the high conductivity of the system. Therefore, one would have to reduce the PTBT polymer to decrease or oxidate to increase the amount of doped anions. By comparing σ b along the main transport direction for positive and negative N , we see that p-doping is favorable compared to n-doping since it leads to higher conductivities. This is the opposite for charge transport along the a-, and c-direction.