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Science 27 November 1992:
Vol. 258. no. 5087, pp. 1474 - 1476
DOI: 10.1126/science.258.5087.1474
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Articles
Photoinduced Electron Transfer from a Conducting Polymer to Buckminsterfullerene
N. S. Sariciftci 1,
L. Smilowitz 1,
A. J. Heeger 1, and
F. Wudl 1
1 Institute for Polymers and Organic Solids, University of California, Santa Barbara, CA 93105
Evidence for photoinduced electron transfer from the excited state of a conducting polymer onto buckminsterfullerene, C60, is reported. After photo-excitation of the conjugated polymer with light of energy greater than the  -* gap, an electron transfer to the C60 molecule is initiated. Photoinduced optical absorption studies demonstrate a different excitation spectrum for the composite as compared to the separate components, consistent with photo-excited charge transfer. A photoinduced electron spin resonance signal exhibits signatures of both the conducting polymer cation and the C60 anion. Because the photoluminescence in the conducting polymer is quenched by interaction with C60, the data imply that charge transfer from the excited state occurs on a picosecond time scale. The charge-separated state in composite films is metastable at low temperatures.
Submitted on July 29, 1992
Accepted on September 15, 1992
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