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Proceedings Paper

Toward single molecule interfacial charge transfer dynamics in a dye-sensitized solar cell model
Author(s): Laura K. Schirra; Michael L. Blumenfeld; Brandon S. Tackett; Jason M. Tyler; Oliver L. A. Monti
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Paper Abstract

Using confocal fluorescence microscopy under ultrahigh vacuum conditions, we investigate the heterogeneous interactions between a perylene bisimide fluorophore and single crystalline Al2O3 (0001) at the single molecule level. We find that the dye molecules undergo reversible transitions to long-lived dark states, with bright and dark periods lasting from several hundred milliseconds to many tens of seconds. These periods are power-law distributed and point towards charge tunneling processes from the molecule to the substrate. The fluorescence intensity levels show a bimodal distribution, indicating different classes of adsorption sites on the sapphire surface. This study is aimed at obtaining a better understanding of interfacial structure and dynamics in order to address ultimately both the growth of organic semiconductor films on inorganic surfaces and the heterogeneous nature of charge transfer in excitonic solar cells.

Paper Details

Date Published: 21 August 2008
PDF: 8 pages
Proc. SPIE 7034, Physical Chemistry of Interfaces and Nanomaterials VII, 703409 (21 August 2008); doi: 10.1117/12.795572
Show Author Affiliations
Laura K. Schirra, The Univ. of Arizona (United States)
Michael L. Blumenfeld, The Univ. of Arizona (United States)
Brandon S. Tackett, The Univ. of Arizona (United States)
Jason M. Tyler, The Univ. of Arizona (United States)
Oliver L. A. Monti, The Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 7034:
Physical Chemistry of Interfaces and Nanomaterials VII
Garry Rumbles; Oliver L. A. Monti, Editor(s)

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