ZnO thin films and nanostructures for emerging optoelectronic applications

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

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

19 Scopus citations

Abstract

ZnO-based thin films and nanostructures grown by PLD for various emerging optoelectronic applications. AZO thin films are currently displacing ITO for many TCO applications due to recent improvements in attainable AZO conductivity combined with processing, cost and toxicity advantages. Advances in the channel mobilities and Id on/off ratios in ZnO-based TTFTs have opened up the potential for use as a replacement for a-Si in AM-OLED and AM-LCD screens. Angular-dependent specular reflection measurements of self-forming, moth-eye-like, nanostructure arrays grown by PLD were seen to have <0.5% reflectivity over the whole visible spectrum for angles of incidence between 10 and 60 degrees. Such nanostructures may be useful for applications such as AR coatings on solar cells. Compliant ZnO layers on mismatched/amorphous substrates were shown to have potential for MOVPE regrowth of GaN. This approach could be used as a means to facilitate lift-off of GaN-based LEDs from insulating sapphire substrates and could allow the growth of InGaN-based solar cells on cheap substrates. The green gap in InGaN-based LEDs was combated by substituting low Ts PLD n-ZnO for MOCVD n-GaN in inverted hybrid heterojunctions. This approach maintained the integrity of the InGaN MQWs and gave LEDs with green emission at just over 510 nm. Hybrid n-ZnO/p-GaN heterojunctions were also seen to have the potential for UV (375 nm) EL, characteristic of ZnO NBE emission. This suggests that there was significant hole injection into the ZnO and that such LEDs could profit from the relatively high exciton binding energy of ZnO.

Original languageEnglish (US)
Title of host publicationOptoelectronic Integrated Circuits XII
DOIs
StatePublished - May 3 2010
EventOptoelectronic Integrated Circuits XII - San Francisco, CA, United States
Duration: Jan 27 2010Jan 28 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7605
ISSN (Print)0277-786X

Other

OtherOptoelectronic Integrated Circuits XII
CountryUnited States
CitySan Francisco, CA
Period1/27/101/28/10

Keywords

  • InGaN
  • LED
  • Nanostructure
  • PLD
  • Solar cell
  • TCO
  • TTFT
  • ZnO

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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  • Cite this

    Rogers, D. J., Teherani, F. H., Sandana, V. E., & Razeghi, M. (2010). ZnO thin films and nanostructures for emerging optoelectronic applications. In Optoelectronic Integrated Circuits XII [76050K] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7605). https://doi.org/10.1117/12.862634