Toward single molecule interfacial charge transfer dynamics in a dye-sensitized solar cell model

Laura K. Schirra, Michael L. Blumenfeld, Brandon S. Tackett, Jason M. Tyler, Oliver L.A. Monti

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish (US)
Title of host publicationPhysical Chemistry of Interfaces and Nanomaterials VII
DOIs
StatePublished - Nov 21 2008
EventPhysical Chemistry of Interfaces and Nanomaterials VII - San Diego, CA, United States
Duration: Aug 11 2008Aug 12 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7034
ISSN (Print)0277-786X

Other

OtherPhysical Chemistry of Interfaces and Nanomaterials VII
CountryUnited States
CitySan Diego, CA
Period8/11/088/12/08

Keywords

  • Dye-sensitized solar cells
  • Perylene bisimide
  • Sapphire
  • Single molecule spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Schirra, L. K., Blumenfeld, M. L., Tackett, B. S., Tyler, J. M., & Monti, O. L. A. (2008). Toward single molecule interfacial charge transfer dynamics in a dye-sensitized solar cell model. In Physical Chemistry of Interfaces and Nanomaterials VII [703409] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7034). https://doi.org/10.1117/12.795572