NDLI: Vibrational Energy Mediates Charge Separation in Organic Photovoltaic Materials

Content Provider	IEEE Xplore Digital Library
Author	Pensack, R.D. Banyas, K.M. Asbury, J.B.
Copyright Year	1995
Abstract	Charge separation and charge trapping following photoinduced electron transfer from the conjugated polymer, poly (2-methoxy-5-ethylhexyloxy-1,4-phenylenecyanovinylene (CN-MEH-PPV), to the electron accepting functionalized fullerene, [6,6]-phenyl C₆₁-butyric acid methyl ester (PCBM), is directly measured using ultrafast vibrational spectroscopy. Our group previously demonstrated that the vibrational frequency of the carbonyl (C=O) stretch of PCBM is sensitive to the location of the molecules relative to the interfaces formed between PCBM clusters and CN-MEH-PPV. The correlation between the carbonyl frequency and the proximity of PCBM molecules to the interfaces enables the time evolution of the frequency of the bleach peak to be interpreted in terms of dissociation of charge transfer states into charge separated states. Temperature-dependent measurements of the rate of this charge separation process indicate that excess vibrational energy in “hot” charge transfer states resulting from the electron transfer reaction enables electrons to escape their Coulombic potentials at the interfaces on ultrafast timescales. Furthermore, temperature-dependent measurements on longer timescales indicate that after the initial charge separation reaction, electrons enter shallow trap states that, on the basis of the radial variation of vibrational frequencies, lie in the interior of PCBM clusters. The vibrational spectra suggest that these interior regions have higher intermolecular order in comparison to the interfaces.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	1776
Ending Page	1783
Page Count	8
File Size	454569
File Format	PDF
ISSN	1077260X
Volume Number	16
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Photovoltaic systems Solar power generation Organic materials Vibration measurement Frequency Current measurement Charge measurement Electron traps Charge transfer Temperature measurement ultrafast optics Charge carrier processes photovoltaic cell materials spectroscopy
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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