Photosensitization of ZnO nanowires with CdSe quantum dots for photovoltaic devices

Kurtis S. Leschkies, Ramachandran Divakar, Joysurya Basu, Emil Enache-Pommer, Janice E. Boercker, C. Barry Carter, Uwe R. Kortshagen, David J. Norris, Eray Aydil

Research output: Contribution to journalArticle

Abstract

We combine CdSe semiconductor nanocrystals (or quantum dots) and single-crystal ZnO nanowires to demonstrate a new type of quantumdot-sensitized solar cell. An array of ZnO nanowires was grown vertically from a fluorine-doped tin oxide conducting substrate. CdSe quantum dots, capped with mercaptopropionic acid, were attached to the surface of the nanowires. When illuminated with visible light, the excited CdSe quantum dots injected electrons across the quantum dol-nanowire interface. The morphology of the nanowires then provided the photoinjected electrons with a direct electrical pathway to the photoanode. With a liquid electrolyte as the hole transport medium, quantumdot-sensitized nanowire solar cells exhibited short-circuit currents ranging from 1 to 2 mA/cm 2 and open-circuit voltages of 0.5-0.6 V when illuminated with 100 mW/cm 2 simulated AM1.5 spectrum. Internal quantum efficiencies as high as 50-60% were also obtained.

Original languageEnglish (US)
Pages (from-to)1793-1798
Number of pages6
JournalNano Letters
Volume7
Issue number6
DOIs
StatePublished - Jun 1 2007

Fingerprint

Semiconductor quantum dots
Nanowires
nanowires
quantum dots
Solar cells
solar cells
Fluorine
Electrons
Open circuit voltage
short circuit currents
Tin oxides
open circuit voltage
Quantum efficiency
Short circuit currents
Nanocrystals
Electrolytes
tin oxides
fluorine
quantum efficiency
nanocrystals

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Leschkies, K. S., Divakar, R., Basu, J., Enache-Pommer, E., Boercker, J. E., Carter, C. B., ... Aydil, E. (2007). Photosensitization of ZnO nanowires with CdSe quantum dots for photovoltaic devices. Nano Letters, 7(6), 1793-1798. https://doi.org/10.1021/nl070430o

Photosensitization of ZnO nanowires with CdSe quantum dots for photovoltaic devices. / Leschkies, Kurtis S.; Divakar, Ramachandran; Basu, Joysurya; Enache-Pommer, Emil; Boercker, Janice E.; Carter, C. Barry; Kortshagen, Uwe R.; Norris, David J.; Aydil, Eray.

In: Nano Letters, Vol. 7, No. 6, 01.06.2007, p. 1793-1798.

Research output: Contribution to journalArticle

Leschkies, KS, Divakar, R, Basu, J, Enache-Pommer, E, Boercker, JE, Carter, CB, Kortshagen, UR, Norris, DJ & Aydil, E 2007, 'Photosensitization of ZnO nanowires with CdSe quantum dots for photovoltaic devices', Nano Letters, vol. 7, no. 6, pp. 1793-1798. https://doi.org/10.1021/nl070430o
Leschkies KS, Divakar R, Basu J, Enache-Pommer E, Boercker JE, Carter CB et al. Photosensitization of ZnO nanowires with CdSe quantum dots for photovoltaic devices. Nano Letters. 2007 Jun 1;7(6):1793-1798. https://doi.org/10.1021/nl070430o
Leschkies, Kurtis S. ; Divakar, Ramachandran ; Basu, Joysurya ; Enache-Pommer, Emil ; Boercker, Janice E. ; Carter, C. Barry ; Kortshagen, Uwe R. ; Norris, David J. ; Aydil, Eray. / Photosensitization of ZnO nanowires with CdSe quantum dots for photovoltaic devices. In: Nano Letters. 2007 ; Vol. 7, No. 6. pp. 1793-1798.
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