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Proceedings Paper

Exciton dissociation and migration in enhanced-order conjugated polymer/nanoparticle hybrid materials
Author(s): Yun-Yue Lin; I. S. Liu; Chun-Wei Chen; Wei-Fang Su
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Paper Abstract

The mechanisms of exciton dissociation and migration in the conjugated polymer (poly(2-methoxy-5-(2'-ethyl)(hexyloxy)1,4-phenylenevinylene)(MEH-PPV) / CdSe nanoparticle hybrid materials were investigated by steady-state and time-resolved photoluminescence spectroscopy. Rapid exciton dissociation at the nanoparticle/polymer interfaces leading to quenching of the photoluminescence efficiency η and shortening of the measured lifetime τPL is observed. The excitons which contribute to the remaining luminescence in polymer will migrate to the lower energy sites with longer conjugated sequences in the composites. The result is evident from the observations of a redshift of the photoluminescence peak positions, a progressive decrease of the Huang-Rhys factor S and an increase in the nature radiative lifetime τR with increasing CdSe nanoparticle content. The solar cell based on the MEH-PPV / CdSe nanoparticle hybrid materials are fabricated and the transport mechanism of the device will also be discussed.

Paper Details

Date Published: 3 November 2006
PDF: 8 pages
Proc. SPIE 6334, Organic Photovoltaics VII, 63340Q (3 November 2006); doi: 10.1117/12.678776
Show Author Affiliations
Yun-Yue Lin, National Taiwan Univ. (Taiwan)
I. S. Liu, National Taiwan Univ. (Taiwan)
Chun-Wei Chen, National Taiwan Univ. (Taiwan)
Wei-Fang Su, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 6334:
Organic Photovoltaics VII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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