Abstract
Resonant Raman scattering (RRS) and photoinduced absorption (PA) measurement in polythiophene are reported. The RRS is analyzed by the amplitude mode model modified to include an additive extrinsic component Δ e. For polythiophene we obtain a ld gap 2 Δ = 2.2 eV and 2 Δ e = 0.22 eV. The dominant photo-carriers generated with an above the gap excitation are charged bipolarons with two correlated electronic PA bands at 0.45 eV and 1.25 eV and several IR active vibrations. The PA spectrum yields for the bipolaron mass M ≅ m e in good agreement with theoretical predictions.
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