Skip to Main content Skip to Navigation
New interface
Theses

Mécanismes de croissance et défauts cristallins dans les structures à nanofils de ZnO pour les LED

Abstract : Quantum well ZnO nanowires and p-type doping by nitrogen ion implantation are studied to make ultraviolet light-emitting diodes. O-polar pyramids and Zn-polar nanowires on sapphire and ZnO substrates are grown. Organized growth of nanowires on a masked Zn-polar ZnO is demonstrated. Similarly, GaN pyramids and nanowires are grown on Ga and N-polar GaN respectively. On sapphire, the dislocation elimination in the underlying pyramids is analyzed. Nanowires with no structural defects allow the growth of ZnO / Zn (1-x) Mg x O core-shell quantum wells. Plastic relaxation is studied, and the Mg composition is optimized to avoid it and attain an internal quantum efficiency as high as 54%. Concerning ion implantation, the defects are identified before and after annealing. They disappear in the near-surface, which lead to an easier recovery of nanowires compared to bulk ZnO. However, a recovered material with activated acceptors is not obtained.
Document type :
Theses
Complete list of metadata

https://tel.archives-ouvertes.fr/tel-00673255
Contributor : ABES STAR :  Contact
Submitted on : Monday, March 5, 2012 - 9:57:38 AM
Last modification on : Friday, March 25, 2022 - 9:40:29 AM

File

perillat_guillaume_2011_archiv...
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00673255, version 1

Collections

CEA | STAR | DRT | LETI | CEA-GRE

Citation

Guillaume Perillat-Merceroz Perillat-Merceroz. Mécanismes de croissance et défauts cristallins dans les structures à nanofils de ZnO pour les LED. Autre. Université de Grenoble, 2011. Français. ⟨NNT : 2011GRENI053⟩. ⟨tel-00673255⟩

Share

Metrics

Record views

529

Files downloads

1515