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

Fingerprint

Polymer Blends
Vibrational spectroscopy
polymer blends
Polymer blends
polarization (charge separation)
Trapping
Spectroscopy
Butyric acid
butyric acid
trapping
Charge
esters
Esters
spectroscopy
Charge trapping
Time Scales
Butyric Acid
Carrier lifetime
Electrons
Conjugated polymers

All Science Journal Classification (ASJC) codes

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

Cite this

Pensack, R. D., Banyas, K. M., Barbour, L. W., & Asbury, J. B. (2008). Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy. In Physical Chemistry of Interfaces and Nanomaterials VII [703404] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7034). https://doi.org/10.1117/12.796100
Pensack, Ryan D. ; Banyas, Kyle M. ; Barbour, Larry W. ; Asbury, John B. / Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy. Physical Chemistry of Interfaces and Nanomaterials VII. 2008. (Proceedings of SPIE - The International Society for Optical Engineering).
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Pensack, RD, Banyas, KM, Barbour, LW & Asbury, JB 2008, Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy. in Physical Chemistry of Interfaces and Nanomaterials VII., 703404, Proceedings of SPIE - The International Society for Optical Engineering, vol. 7034, Physical Chemistry of Interfaces and Nanomaterials VII, San Diego, CA, United States, 8/11/08. https://doi.org/10.1117/12.796100

Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy. / Pensack, Ryan D.; Banyas, Kyle M.; Barbour, Larry W.; Asbury, John B.

Physical Chemistry of Interfaces and Nanomaterials VII. 2008. 703404 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7034).

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

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Pensack RD, Banyas KM, Barbour LW, Asbury JB. Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy. In Physical Chemistry of Interfaces and Nanomaterials VII. 2008. 703404. (Proceedings of SPIE - The International Society for Optical Engineering). https://doi.org/10.1117/12.796100