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Proceedings Paper

Photoinduced absorption of conducting polymer-C60 composites
Author(s): Esther M. Conwell; Howard A. Mizes; Jerry Perlstein
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Paper Abstract

Experimental studies of photoinduced absorption, PA, have been carried out by several groups on composites of C60 with conducting polymers such as poly[2-methoxy, 5-(ethyl hexyloxy) -p- phenylene vinylene], MEH-PPV, to understand the quenching of photoluminescence and increase of photoconductivity caused by the addition of small amounts of C60. To account for the observed PA it is first necessary to know where the C60 molecules sit relative to the MEH-PPV chains. We found with the use of a Monte Carlo cooling algorithm that the most probable position of the C60 is in a channel formed by the alkoxy side chains, its center approximately 10 angstrom from that of the MEH-PPV backbone. We identify the PA peak seen in MEH-PPV as the transition between the lower and upper levels of a polaron coupled to one of opposite sign on a neighboring chain. Calculations are carried out for the energy levels of neutral C60 and C60- using a tight binding Hamiltonian with the parameters obtained by Harigaya. To determine the effect on the levels of the Coulomb interaction between C60- and a positively charged polaron, P+, on MEH-PPV we use coupled equations. Finally, we suggest that the peak of the PA in the composite is due to transitions between the two polaron levels of a free P+ on MEH-PPV. Additional PA features in the composite can be identified as due to C60- and neutral C60.

Paper Details

Date Published: 8 December 1995
PDF: 12 pages
Proc. SPIE 2530, Fullerenes and Photonics II, (8 December 1995); doi: 10.1117/12.228106
Show Author Affiliations
Esther M. Conwell, Xerox Corp. and Univ. of Rochester (United States)
Howard A. Mizes, Xerox Corp. and Univ. of Rochester (United States)
Jerry Perlstein, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 2530:
Fullerenes and Photonics II
Zakya H. Kafafi, Editor(s)

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