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Proceedings Paper

Photoinduced charge transfer across an organic/contact interface: polaronic state spectroscopy
Author(s): Austin L. Carver; Kasun Fernando; Hemant M. Shah; Sowmya Kolli; Buddika Abeyweera; Bruce W. Alphenaar; Madhu Menon; Sergey Lisenkov
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Paper Abstract

Photo-induced charge transfer from an Indium Tin Oxide (ITO) contact into [6,6]-phenyl-C61-butyric acid methyl ester (PC60BM) and [6,6]-phenyl-C71-butyric acid methyl ester (PC70BM) is measured. Charge transfer peaks are observed for a series of excitation energies below the PCBM absorption edge. If charge transfer is blocked using a tunnel barrier or an applied electric field, the peaks disappear. The observed transitions are similar to those predicted by theoretical calculations of the absorption spectra for negatively charged C60 and C70 chains. This observation suggests that charge transfer occurs preferentially at the polaronic transition energies in the PCBM, providing a means for polaronic state spectroscopy.

Paper Details

Date Published: 11 September 2013
PDF: 8 pages
Proc. SPIE 8811, Physical Chemistry of Interfaces and Nanomaterials XII, 88110N (11 September 2013); doi: 10.1117/12.2026290
Show Author Affiliations
Austin L. Carver, Univ. of Louisville (United States)
Kasun Fernando, Univ. of Louisville (United States)
Hemant M. Shah, Univ. of Louisville (United States)
Sowmya Kolli, Univ. of Louisville (United States)
Buddika Abeyweera, Univ. of Louisville (United States)
Bruce W. Alphenaar, Univ. of Louisville (United States)
Madhu Menon, Univ. of Kentucky (United States)
Sergey Lisenkov, Univ. of South Florida (United States)

Published in SPIE Proceedings Vol. 8811:
Physical Chemistry of Interfaces and Nanomaterials XII
Natalie Banerji; Carlos Silva, Editor(s)

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