Polarized doping-induced infrared absorption in highly oriented conjugated polymers

We present polarized, doping-induced absorption spectra obtained from conjugated polymers oriented by gel-processing in ultrahigh molecular weight polyethylene. Upon doping with iodine vapor, both poly(2-methoxy, 5-(2 ′ -ethyl)-hexyloxy) paraphenylene vinylene), MEH-PPV, and poly (3-octyl thiophene)...

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Bibliographic Details
Published in:Chemical physics letters 2001-02, Vol.335 (1), p.23-26
Main Authors: Miller, E.Kirk, Brabec, Christoph J., Neugebauer, Helmut, Heeger, Alan J., Serdar Sariciftci, N.
Format: Article
Language:English
Subjects:
Applied sciences
Electrical, magnetic and optical properties
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
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Summary:We present polarized, doping-induced absorption spectra obtained from conjugated polymers oriented by gel-processing in ultrahigh molecular weight polyethylene. Upon doping with iodine vapor, both poly(2-methoxy, 5-(2 ′ -ethyl)-hexyloxy) paraphenylene vinylene), MEH-PPV, and poly (3-octyl thiophene), P3OT, show absorption features in the mid-infrared (the infrared-active vibrational (IRAV) modes and the low energy electronic absorption) that are strongly polarized parallel to the chain axis. All observed features have predominantly parallel polarization. We suggest that carrier-induced and electrode-induced losses in electrically pumped waveguide structures could be greatly reduced by using highly oriented films, with molecular axes orthogonal to the electric field polarization of the waveguide mode.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(01)00008-2