Photoinduced Bipolaron Bands and Vibrational Modes in Poly(isothianaphtene)
Photoinduced absorption studies of poly(isothianaphtene) (PITN) in an extended spectral range, including electronic bands as well as vibrational modes, are presented for the first time. The narrow bandgap conjugated polymer PITN, which is derived from polythiophene by fusing a benzene ring to the thiophene ring in the monomer, exhibits photoinduced absorption spectra which are characteristic of the polythiophene (PT) family (e.g. PT and poly(3-methylthiophene), P3MT). Namely, the photoinduced absorption spectrum is composed of infrared active vibration (IRAV) absorption bands typical of charged defects in conjugated polymers, and two well defined midgap electronic absorption bands, at 0.33 and 0.68 eV. Similar to the case of the polymers PT and P3MT, we tentatively assign the photoinduced absorption bands to bipolarons.
KeywordsBenzene Tungsten Thiophene Poly Thiophene
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- 11.J. Poplawski, E. Ehrenfreund, K. Cromack, A.J. Epstein, A.J. Frank: Synth. Met., in pressGoogle Scholar