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Proceedings Paper

The electron and energy transfer between oligothiophenes and thieno[3,4-b]thiophene units
Author(s): Jodi Szarko; Jianchang Guo; Yongye Liang; Brian Rolczynski; Luping Yu; Lin X. Chen
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Paper Abstract

In a recent study, it has been shown that organic photovoltaic (OPV) solar cells consisting of polymers with certain stoichiometric ratios of alkyl thiophene:thieno[3,4-b]thiophene monomeric units in random sequences, when combined with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), may have potentials for creating more efficient devices. Such a potential enhancement is mainly due to the light harvesting in most of the visible and near infrared region by these low band-gap polymers. However, very little is known about the photoinduced energy/electron transfer and transport within these copolymers. It is important to understand both the ultrafast interactions between these two monomeric units when they are linked in the copolymers and their interactions with the electron acceptor PCBM in order to determine the transport mechanisms in these systems, and then to create the architectures that optimize electronic transport properties. Therefore, three oligomer molecules have been synthesized to model the local interactions in the copolymers, each of which consists of a thieno[3,4-b] thiophene derivative at its center linked with two alkyl oligothiophene side units. The alkyl oligothiophene units for the three molecules are 2, 4, or 8 units in length. By performing transient absorption and fluorescence upconversion measurements, the nature of the early exciton diffusion and energy transfer between these different units is elucidated.

Paper Details

Date Published: 21 August 2008
PDF: 10 pages
Proc. SPIE 7034, Physical Chemistry of Interfaces and Nanomaterials VII, 703403 (21 August 2008); doi: 10.1117/12.797442
Show Author Affiliations
Jodi Szarko, Northwestern Univ. (United States)
Argonne National Lab. (United States)
Jianchang Guo, Argonne National Lab. (United States)
The Univ. of Chicago (United States)
Yongye Liang, The Univ. of Chicago (United States)
Brian Rolczynski, Northwestern Univ. (United States)
Argonne National Lab. (United States)
Luping Yu, The Univ. of Chicago (United States)
Lin X. Chen, Northwestern Univ. (United States)
Argonne National Lab. (United States)

Published in SPIE Proceedings Vol. 7034:
Physical Chemistry of Interfaces and Nanomaterials VII
Garry Rumbles; Oliver L. A. Monti, Editor(s)

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