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Ultrafast Spectroscopic Study of Photoinduced Electron Transfer in an Oligo(thienylenevinylene):Fullerene Composite
Author(s) -
Hwang I.W.,
Xu Q.H.,
Soci C.,
Chen B.,
Jen A. K.Y.,
Moses D.,
Heeger A. J.
Publication year - 2007
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200600267
Subject(s) - photoinduced electron transfer , materials science , ultrafast laser spectroscopy , photochemistry , thiophene , electron transfer , fullerene , femtosecond , photoconductivity , spectroscopy , optoelectronics , organic chemistry , optics , chemistry , laser , physics , quantum mechanics
Abstract Photoinduced electron transfer and competing processes have been studied in composites of an oligo(thienylenevinylene) (OTV), comprised of ten dibuthoxyl‐thiophene units separated by vinylene units, and a C 60 derivative, [6,6]‐phenyl‐C 61 butyric acid methyl ester (PCBM), by using femtosecond transient absorption spectroscopy and sub‐nanosecond transient photoconductivity. We find that in OTV:PCBM the photoexcitations decay primarily via intrachain relaxation rather than photoinduced electron transfer from OTV to PCBM. The electron‐transfer process requires ca. 14 ps; larger by more than two orders of magnitude than the required time observed in conjugated‐polymer:C 60 composites, and also larger than the 0.6 ps singlet‐state lifetime in OTV. These observations indicate that the quantum efficiency for photoinduced electron transfer in OTV:PCBM is less than 5 %.