To investigate the charge transfer in protonated PCPDT-BT, our method of choice is spin-unrestricted density functional theory (DFT) allowing for broken spin symmetry, which was previously used successfully in predicting charge densities as well as structure and spectroscopic properties also of doped conjugated polymers. For a more detailed discussion we refer the reader to one of our earlier papers. In the present work, electronic states are described by a 6-31G** basis set with the rangeseparated cam-B3LYP functional. Molecular van der Waals interaction is covered at the level of Grimme's D3 dispersion correction with Becke-Johnson damping. Time-dependent DFT (TD-DFT) is employed to calculate vertical excitation energies. Solutions are modelled by the conductor-like polarizable continuum model (C-PCM) with chlorobenzene as solvent. All calculations are done with GAUSSIAN16. The Multiwfn software is used to analyze the Atomic Dipole Moment Corrected Hirshfeld charge and the density of states by the Hirshfeld method.