NDLI: Polarons in conducting polymers

Content Provider	IEEE Xplore Digital Library
Author	Conwell, E.M. Mizes, H.A.
Copyright Year	1994
Description	Author affiliation: Xerox Webster Research Center (Conwell, E.M.)
Abstract	Summary form only given. We have setup an SSH type of hamiltonian for PPV by choosing a set of t/sub 0/, the transfer integral, /spl prop/ (=/spl part/t/sub 0/ / /spl part/u/) and K, the elastic constant, to match the known PPV valence band width, /sp 1/ energy gap and aimerization within 1%. with these parameters, for long chains the polaron level is 0.18 eV form the band edge, the top bipolaron level 0.53 eV from the edge. Interchain coupling should be dominated by the coupling between the 3 C's that are closest to H's on the nearest neighbor chain. Determining the parameters for these couplings to match the LDA calculated transverse banwidth, /sub 1/ we find that the polaron is not destabilized by interchain coupling as it is in(CH)/sub x/ for the P2/sub 1/a structure. Studies of picosecond photoinduced absorption (PA) in PPV lead to the conclusion that polaron pairs, P/sub +/ and P/sub -/, are generated in larger numbers than singlet excitons./sub 2/ We have calculated the properties of these pairs using the SSH type hamiltonian described above. The binding energy of air of long chains is /spl tilde/0.35 eV. The peaks of the optical absorption of such found to agree well with the observed PA. We have also calculated the in (CH)/sub x/ and find good agreement with the observed PA for that to single polarons. We suggest that photogeneration of polaron pairs predominates over that of single polarons in conducting polymers, accounting for the paucity of evidence for the photogeneration of single polarons.
Starting Page	238
Ending Page	238
File Size	91860
Page Count	1
File Format	PDF
DOI	10.1109/STSM.1994.835211
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	Absorption Pain Photonic band gap Ionization Geometrical optics Linear discriminant analysis Nonlinear optics Optical polymers Nearest neighbor searches
Content Type	Text
Resource Type	Article

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