Ultrafast IR spectroscopic study of free carrier formation and charge trapping in organic photovoltaic polymer blends

Ryan D. Pensack, Kyle M. Banyas, John B. Asbury

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

Abstract

Photoinduced charge separation, charge recombination, and trapping in polymer blend organic photovoltaic materials are examined using ultrafast 2D IR and vis-IR spectroscopy in conjunction with transient photocurrent techniques. Native vibrational modes of the functionalized fullerene, PCBM, are probed as reporters of the charge carrier dynamics. Following a free carrier formation process that occurs on a surprisingly fast picosecond time scale, charge carriers become trapped in poly(p-phenylenevinylene) (PPV)-based OPV materials but are not readily trapped in polythiophene (PT)-based materials. The trapping process results in the formation of distinct vibrational features that are not present in the PT-based materials. Although the origin of the distinct trapping characteristics remains unclear, they help rationalize the qualitatively different bimolecular charge recombination behavior that has been observed in PPV-based versus PT-based OPV materials. 2D IR spectroelectrochemical investigations of trapped charges may provide a means to elucidate the structures of the traps in PPV-based materials.

Original languageEnglish (US)
Title of host publicationAmerican Chemical Society - 237th National Meeting and Exposition, ACS 2009, Abstracts of Scientific Papers
StatePublished - Dec 1 2009
Event237th National Meeting and Exposition of the American Chemical Society, ACS 2009 - Salt Lake City, UT, United States
Duration: Mar 22 2009Mar 26 2009

Publication series

NameACS National Meeting Book of Abstracts
ISSN (Print)0065-7727

Other

Other237th National Meeting and Exposition of the American Chemical Society, ACS 2009
CountryUnited States
CitySalt Lake City, UT
Period3/22/093/26/09

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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