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Phys. Rev. Lett. 89, 107401 (2002) [4 pages]

Dynamics of the Electric Field-Assisted Charge Carrier Photogeneration in Ladder-Type Poly(Para-Phenylene) at a Low Excitation Intensity

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Vidmantas Gulbinas1, Yuri Zaushitsyn3, Villy Sundström3, Dirk Hertel2, Heinz Bässler2, and Arkady Yartsev3
1Institute of Physics, A. Gostauto 12, 2600, Vilnius, Lithuania
2Institute of Physical, Nuclear and Macromolecular Chemistry and Material Science Center, Philipps-University, Hans-Meerwein-Strasse, 35032 Marburg, Germany
3Department of Chemical Physics, Lund University, Box 124, SE-221 00 Lund, Sweden

Received 9 November 2001; published 14 August 2002

Electric field-assisted charge carrier photogeneration in a ladder-type methyl-substituted poly(paraphenylene) was investigated by ultrafast absorption spectroscopy at low excitation intensity. The dissociation of excitons into electron-hole pairs occurs from the vibrationally relaxed excited state throughout its lifetime and is caused by the applied electric field, rather than by existence of special “dissociation sites.” These findings are of importance for material choice in device applications.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.107401
DOI:
10.1103/PhysRevLett.89.107401
PACS:
78.47.+p, 78.55.Kz, 78.66.Qn
 
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