1. Photosensitization of ZnO nanowires with CdSe quantum dots for photovoltaic devices.
- Author
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Leschkies KS, Divakar R, Basu J, Enache-Pommer E, Boercker JE, Carter CB, Kortshagen UR, Norris DJ, and Aydil ES
- Subjects
- Cadmium Compounds radiation effects, Equipment Design, Equipment Failure Analysis, Light, Nanotechnology instrumentation, Nanotechnology methods, Nanotubes radiation effects, Nanotubes ultrastructure, Photochemistry instrumentation, Sulfides radiation effects, Zinc Oxide radiation effects, Cadmium Compounds chemistry, Electric Power Supplies, Nanotubes chemistry, Photochemistry methods, Quantum Dots, Sulfides chemistry, Zinc Oxide chemistry
- Abstract
We combine CdSe semiconductor nanocrystals (or quantum dots) and single-crystal ZnO nanowires to demonstrate a new type of quantum-dot-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 dot-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, quantum-dot-sensitized nanowire solar cells exhibited short-circuit currents ranging from 1 to 2 mA/cm2 and open-circuit voltages of 0.5-0.6 V when illuminated with 100 mW/cm2 simulated AM1.5 spectrum. Internal quantum efficiencies as high as 50-60% were also obtained.
- Published
- 2007
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