Hot-electron transfer from semiconductor nanocrystals

William A. Tisdale, Kenrick J. Williams, Brooke A. Timp, David J. Norris, Eray Aydil, X. Y. Zhu

Research output: Contribution to journalArticle

Abstract

In typical semiconductor solar cells, photons with energies above the semiconductor bandgap generate hot charge carriers that quickly cool before all of their energy can be captured, a process that limits device efficiency. Although fabricating the semiconductor in a nanocrystalline morphology can slow this cooling, the transfer of hot carriers to electron and hole acceptors has not yet been thoroughly demonstrated. We used time-resolved optical second harmonic generation to observe hot-electron transfer from colloidal lead selenide (PbSe) nanocrystals to a titanium dioxide (TiO2) electron acceptor. With appropriate chemical treatment of the nanocrystal surface, this transfer occurred much faster than expected. Moreover, the electric field resulting from sub-50-femtosecond charge separation across the PbSe-TiO2 interface excited coherent vibrations of the TiO2 surface atoms, whose motions could be followed in real time. Copyright Science 2010 by the American Association for the Advancement of Science; all rights reserved.

Original languageEnglish (US)
Pages (from-to)1543-1547
Number of pages5
JournalScience
Volume328
Issue number5985
DOIs
StatePublished - Jun 18 2010

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Quantum Dots
Semiconductors
Electrons
Nanoparticles
Vibration
Photons
Equipment and Supplies
lead selenide

ASJC Scopus subject areas

  • General

Cite this

Tisdale, W. A., Williams, K. J., Timp, B. A., Norris, D. J., Aydil, E., & Zhu, X. Y. (2010). Hot-electron transfer from semiconductor nanocrystals. Science, 328(5985), 1543-1547. https://doi.org/10.1126/science.1185509

Hot-electron transfer from semiconductor nanocrystals. / Tisdale, William A.; Williams, Kenrick J.; Timp, Brooke A.; Norris, David J.; Aydil, Eray; Zhu, X. Y.

In: Science, Vol. 328, No. 5985, 18.06.2010, p. 1543-1547.

Research output: Contribution to journalArticle

Tisdale, WA, Williams, KJ, Timp, BA, Norris, DJ, Aydil, E & Zhu, XY 2010, 'Hot-electron transfer from semiconductor nanocrystals', Science, vol. 328, no. 5985, pp. 1543-1547. https://doi.org/10.1126/science.1185509
Tisdale WA, Williams KJ, Timp BA, Norris DJ, Aydil E, Zhu XY. Hot-electron transfer from semiconductor nanocrystals. Science. 2010 Jun 18;328(5985):1543-1547. https://doi.org/10.1126/science.1185509
Tisdale, William A. ; Williams, Kenrick J. ; Timp, Brooke A. ; Norris, David J. ; Aydil, Eray ; Zhu, X. Y. / Hot-electron transfer from semiconductor nanocrystals. In: Science. 2010 ; Vol. 328, No. 5985. pp. 1543-1547.
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