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

doi:10.1117/12.796100

21 August 2008 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

Author Affiliations +

Proceedings Volume 7034, Physical Chemistry of Interfaces and Nanomaterials VII; 703404 (2008) https://doi.org/10.1117/12.796100
Event: NanoScience + Engineering, 2008, San Diego, California, United States

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.

Citation Download Citation

Ryan D. Pensack, Kyle M. Banyas, Larry W. Barbour, and John B. Asbury "Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy", Proc. SPIE 7034, Physical Chemistry of Interfaces and Nanomaterials VII, 703404 (21 August 2008); https://doi.org/10.1117/12.796100

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