Photogeneration of Confined Soliton Pairs (Bipolarons) in Polythiophene.
CALIFORNIA UNIV SANTA BARBARA INST FOR POLYMERS AND ORGANIC SOLIDS
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From photoinduced absorption and light induced electron spin resonance, we demonstrate that the dominant photocarriers generated in polythiophene with excitation above the energy gap E sub g are charged bipolarons spin zero. The observation of bipolarons B superscript 2 or - rather than polarons P superscript or - as the dominant photoexcitations demonstrates that the Coulomb contribution ot the bipolaron eneergy U sub B is sufficeitly small that P superscript or - P superscrit or - yields B superscript or -2. From the analysis of the spectra, we find U sub B E sub g yields 0.12. approx. Author
- Electricity and Magnetism
- Nuclear Physics and Elementary Particle Physics