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Proceedings Paper

Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy
Author(s): Ryan D. Pensack; Kyle M. Banyas; Larry W. Barbour; John B. Asbury
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Paper 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.

Paper Details

Date Published: 21 August 2008
PDF: 8 pages
Proc. SPIE 7034, Physical Chemistry of Interfaces and Nanomaterials VII, 703404 (21 August 2008); doi: 10.1117/12.796100
Show Author Affiliations
Ryan D. Pensack, The Pennsylvania State Univ. (United States)
Kyle M. Banyas, The Pennsylvania State Univ. (United States)
Larry W. Barbour, The Pennsylvania State Univ. (United States)
John B. Asbury, The Pennsylvania State Univ. (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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