Photoinduced charge transfer across an organic/contact interface: polaronic state spectroscopy

Austin L. Carver; Kasun Fernando; Hemant M. Shah; Sowmya Kolli; Buddika Abeyweera; Bruce W. Alphenaar; Madhu Menon; Sergey Lisenkov

doi:10.1117/12.2026290

11 September 2013 Photoinduced charge transfer across an organic/contact interface: polaronic state spectroscopy

Austin L. Carver, Kasun Fernando, Hemant M. Shah, Sowmya Kolli, Buddika Abeyweera, Bruce W. Alphenaar, Madhu Menon, Sergey Lisenkov

Author Affiliations +

Proceedings Volume 8811, Physical Chemistry of Interfaces and Nanomaterials XII; 88110N (2013) https://doi.org/10.1117/12.2026290
Event: SPIE NanoScience + Engineering, 2013, San Diego, California, United States

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.

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Austin L. Carver, Kasun Fernando, Hemant M. Shah, Sowmya Kolli, Buddika Abeyweera, Bruce W. Alphenaar, Madhu Menon, and Sergey Lisenkov "Photoinduced charge transfer across an organic/contact interface: polaronic state spectroscopy", Proc. SPIE 8811, Physical Chemistry of Interfaces and Nanomaterials XII, 88110N (11 September 2013); https://doi.org/10.1117/12.2026290

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