The electron and energy transfer between oligothiophenes and thieno[3,4-b]thiophene units

Jodi Szarko*, Jianchang Guo, Yongye Liang, Brian Rolczynski, Luping Yu, Lin X Chen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationPhysical Chemistry of Interfaces and Nanomaterials VII
DOIs
StatePublished - Nov 21 2008
EventPhysical Chemistry of Interfaces and Nanomaterials VII - San Diego, CA, United States
Duration: Aug 11 2008Aug 12 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7034
ISSN (Print)0277-786X

Other

OtherPhysical Chemistry of Interfaces and Nanomaterials VII
CountryUnited States
CitySan Diego, CA
Period8/11/088/12/08

Keywords

  • Fluorescence upconversion
  • Oligothiophene
  • Thienothiophene
  • Transient absorption

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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