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

D. J. Rogers, V. E. Sandana, F. Hosseini Teherani, M. Razeghi, H. J. Drouhin

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

11 Scopus citations

Abstract

ZnO nanostructures were grown on Si (111) substrates using Pulsed Laser Deposition. The impact of growth temperature (Ts) and Ar pressure (P Ar) 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 heteroj unction 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.

Original languageEnglish (US)
Title of host publicationZinc Oxide Materials and Devices IV
DOIs
StatePublished - Jun 29 2009
EventZinc Oxide Materials and Devices IV - San Jose, CA, United States
Duration: Jan 25 2009Jan 28 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7217
ISSN (Print)0277-786X

Other

OtherZinc Oxide Materials and Devices IV
CountryUnited States
CitySan Jose, CA
Period1/25/091/28/09

Keywords

  • Heteroj unction Light Emitting Diode
  • N-ZnO/p-Si
  • Nanostructures

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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