Abstract
Through specific marker bands, IR and Raman spectra of chemically doped polyconjugated polymers allow investigation of doping and monitoring of its effectiveness. The vibrational modes associated with the doping-induced features provide information about the polymer units affected by the transferred charge and the structure relaxation associated with the formation of the polaron. Here, we doped the P(NDI2OD-T2) copolymer with three differently substituted 1H-benzimidazoles, which allow for doping in solution, leading to an increase of conductivity values up to four orders of magnitude. Careful inspection of the IR and Raman spectra of P(NDI2OD-T2) while varying the dopant concentration and the kind of dopant proves that the polaron markers are almost independent from the dopant species. The IR intensity of the polaron markers is a very sensitive probe of charge delocalization upon doping: for n-doped P(NDI2OD-T2), these bands show absorption intensities of the same strength as those of the pristine specie...
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