Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy

Ryan D. Pensack, Kyle M. Banyas, Larry W. Barbour, John B. Asbury

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

Abstract

The dynamics of photoinduced charge separation, recombination and trapping are examined in a polymer blend photovoltaic material with ultrafast visible pump - infrared probe and time-resolved infrared spectroscopy. The carbonyl (C=O) stretch of methanofullerene [6,6]-phenyl C61-butyric acid methyl ester (PCBM) is probed as a local vibrational reporter of the dynamics in a blend with a poly(p-phenylenevinylene) (PPV) -based conjugated polymer, CN-MEH-PPV. Following interfacial electron transfer, geminate electron - hole pair dissociation occurs on ultrafast timescales. Subsequent to this charge separation process, charge carriers become trapped on the microsecond timescale resulting in the formation of a distinct peak in the vibrational spectra corresponding to the anion of PCBM. The charge trapping dynamics correspond to the carrier lifetime of similar PPV-based polymer blends as reported in photocurrent transients from the literature.

Original languageEnglish (US)
Title of host publicationPhysical Chemistry of Interfaces and Nanomaterials VII
DOIs
StatePublished - Nov 25 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

All Science Journal Classification (ASJC) codes

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

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