Electron transfer dynamics at the ZnO (10-10) surface

William A. Tisdale, Matthias Muntwiler, David J. Norris, Eray Aydil, Xiaoyang Zhu

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

Abstract

Recently, ZnO nanoparticle films and nanowire arrays have been used in lieu of TiO2 in dye- and quantum dot-sensitized solar cells and in hybrid organic/inorganic bulk heterojunction photovoltaic devices. The nonpolar (10-10) surface is the lowest-energy ZnO surface and constitutes the side facets of ZnO nanowires and much of the surface area of sintered ZnO nanoparticle films. Consequently, the majority of charge separation and recombination events in these devices occur at the (10-10) or equivalent surfaces. We are using time-resolved photoemission and surface nonlinear optical spectroscopies to study electron transfer dynamics at this important surface. On the clean (10-10) surface we find a continuum of defect-derived surface states extending into the band gap below the conduction band edge which may play an important role in electron transfer across this surface and in electron transport in devices featuring ZnO photoanodes. Additionally, we observe ultrafast sub-20 femtosecond cooling of hot electrons within the ZnO conduction band, suggesting that hot carrier transport may not be feasible in this material.

Original languageEnglish (US)
Title of host publicationAmerican Chemical Society - 235th National Meeting, Abstracts of Scientific Papers
StatePublished - 2008
Event235th National Meeting of the American Chemical Society, ACS 2008 - New Orleans, LA, United States
Duration: Apr 6 2008Apr 10 2008

Publication series

NameACS National Meeting Book of Abstracts
ISSN (Print)0065-7727

Other

Other235th National Meeting of the American Chemical Society, ACS 2008
CountryUnited States
CityNew Orleans, LA
Period4/6/084/10/08

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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  • Cite this

    Tisdale, W. A., Muntwiler, M., Norris, D. J., Aydil, E., & Zhu, X. (2008). Electron transfer dynamics at the ZnO (10-10) surface. In American Chemical Society - 235th National Meeting, Abstracts of Scientific Papers (ACS National Meeting Book of Abstracts).