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Proceedings Paper

Fabrication of nanostructured heterojunction LEDs using self-forming moth eye type arrays of n-ZnO nanocones grown on p-si (111) substrates by pulsed laser deposition
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Paper Abstract

ZnO nanostructures were grown on Si (111) substrates using: Pulsed Laser Deposition. The impact of growth temperature (Ts) and Ar pressure (PAr) on the morphology, crystal structure and photoluminescence was investigated. Various types of ZnO nanostructures were obtained. Self-forming arrays of vertically-aligned nanorods and nanocones with strong c-axis crystallographic orientation and good optical response were obtained at higher Ts. The nanocone, or "moth-eye", type structures were selected for LED development because of their graded effective refractive index, which could facilitate improved light extraction at the LED/air interface. Such moth-eye arrays were grown on p-type Si (111) substrates to form heterojunction LEDs with the n-type ZnO nanocones acting as an active component of the device. These nanostructured LEDs gave rectifying I/V characteristics with a threshold voltage of about 6V and a blueish-white electroluminescence, which was clearly visible to the naked eye.

Paper Details

Date Published: 28 February 2009
PDF: 8 pages
Proc. SPIE 7217, Zinc Oxide Materials and Devices IV, 721708 (28 February 2009); doi: 10.1117/12.817030
Show Author Affiliations
David J. Rogers, Nanovation SARL (France)
V. E. Sandana, Nanovation SARL (France)
Northwestern Univ. (United States)
École Polytechnique (France)
F. Hosseini Teherani, Nanovation SARL (France)
M. Razeghi, Northwestern Univ. (United States)
H.-J. Drouhin, École Polytechnique (France)

Published in SPIE Proceedings Vol. 7217:
Zinc Oxide Materials and Devices IV
Ferechteh Hosseini Teherani; Cole W. Litton; David J. Rogers, Editor(s)

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