Photoinduced absorption study of sexithiophene; evidence for photogeneration of polarons

J. Poplawskp, E. Ehrenfreund, J. Cornil, J. L. Bredas, R. Pughc, M. Ibrahim, A. J. Frank

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


We have studied films of neutral 6T using photoinduced absorption spectroscopy. Two pairs of strong and weak narrow absorption lines are observed at 0.80 (strong), 0.96 (weak) and 1.54 (s), 1.68 (w) eV, respectively. They are very similar in energy, width and shape to those found in the radical cation 6T+. We therefore assign them to long lived photoinduced polarons (radical ions). The observed polaron spectrum is in very good agreement with energy level calculations of 6T. In addition, there is a weak separate line at 1.1 eV that is close in energy to the position of the dication related band (1.2 eV).

Original languageEnglish (US)
Pages (from-to)407-413
Number of pages7
JournalMolecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
Issue number1
StatePublished - Nov 1994
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the US-Israel Binational Science Foundation (BSF 89-322), and by the fund for the promotion of research at the Technion. One of us, JC, is an Aspirant of the Belgian National Fund for Scientific Research (FNRS). The work in Mons is partly supported by the Belgian Government “Programme d’Impulsion en Technologie de 1’Information (IT/SC/22)” and “Pble d’Attraction Interuniversitaire en Chimie Supramoldculaire et Catalyse” , European Commission, FNRS/PRFC, and an IBM Academic Joint Study.

ASJC Scopus subject areas

  • Condensed Matter Physics


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