NDLI: Photogeneration of polarons in sexithiophene oligomers

Content Provider	IEEE Xplore Digital Library
Author	Poplawski, J. Ehrenfreund, E. Pugh, R. Ibrahim, M. Frank, A.J. Cornil, J. Bredas, J.L.
Copyright Year	1994
Description	Author affiliation: Universite de Mons-Hainaut (Poplawski, J.)
Abstract	Summary form only given. We have studied films of neutral 6T in order to compare the electronic structure of its photoexcited state with that of the radical cations and dications, on one hand, and with the photogenerated defects observed for the neutral polythiophene. Using the photoinduced absorption spectroscopy, we have found two strong absorption bands very similar in energy (0.80 and 1.54 eV) and shape (both have distinct vibronic shoulders) to those found for the radical cation 6T/sup middot/+/. In addition, there is a very weak separate band (at 1.1 eV) close in energy to the position of the dication related band (1.2 eV). Photoinduced infrared active vibrations were also observed, confirming that these defects are charged. Good agreement with the calculated transitions of the oligothiophene radical cations is obtained. We conclude from our measurements that in the time domain of our steady state measurements (I msec), most of the photogenerated defects are polarons (radical cations). We further conclude that, at least in the 6T oligomer, the characteristic absorption of the polaron contains two strong transitions, whereas that of bipolaron (dication) contains only a single band.
Starting Page	42
Ending Page	42
File Size	103549
Page Count	1
File Format	PDF
DOI	10.1109/STSM.1994.834699
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-07-24
Publisher Place	Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spectroscopy Absorption Raman scattering Doping Conductivity Resonance Laser excitation Time measurement Solid state circuits Polymers
Content Type	Text
Resource Type	Article

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