Devizis, A., Serbenta, A., Peckus, D., Thiessen, A., Alle, R., Meerholz, K., Hertel, D. and Gulbinas, V. (2010). Electric field assisted charge carrier photogeneration in poly(spirobifluorene-co-benzothiadiazole). J. Chem. Phys., 133 (16). MELVILLE: AMER INST PHYSICS. ISSN 1089-7690

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Abstract

The dynamics of charge carrier generation in poly (spirobifluorene-co-benzothiadiazole) was investigated by electric field-induced fluorescence quenching and differential absorption measurements. Three different time domains of carrier generation have been identified: an ultrafast phase, a subnanosecond phase, and an entire lifetime phase. The charge generation efficiencies during the first and second phases were found to be almost independent of temperature, being about 25% and 10%, respectively, at an applied electric field of 1.3 x 10(6) V/cm, while the generation efficiency during the third phase increases from 2% at 80 K to 10% at room temperature. The results of transient spectroscopy measurements and quantum chemical calculations suggest an intramolecular charge transfer for about 1 ps from the alkoxy-substituted fluorene side group to the benzothiadiazole subunit of the main chain. The formation and evolution of the resulting charge transfer states determine the way of charge carrier generation. (C) 2010 American Institute of Physics. [doi:10.1063/1.3493589]

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Devizis, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Serbenta, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Peckus, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Thiessen, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Alle, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meerholz, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hertel, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gulbinas, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-494082
DOI: 10.1063/1.3493589
Journal or Publication Title: J. Chem. Phys.
Volume: 133
Number: 16
Date: 2010
Publisher: AMER INST PHYSICS
Place of Publication: MELVILLE
ISSN: 1089-7690
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
POLYMER; DISSOCIATION; EFFICIENCY; SPIROCONJUGATION; FLUORESCENCE; POLYFLUORENE; SEPARATION; INJECTION; EXCITONS; BEHAVIORMultiple languages
Chemistry, Physical; Physics, Atomic, Molecular & ChemicalMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/49408

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