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Pulsed laser deposition and characterisation of ZnO and aluminium-doped ZnO nanostructures on silicon and flexible plastic substrates

Inguva, Saikumar (2016) Pulsed laser deposition and characterisation of ZnO and aluminium-doped ZnO nanostructures on silicon and flexible plastic substrates. PhD thesis, Dublin City University.

Abstract
We have developed recipes for the catalyst-free growth of upstanding/vertically aligned ZnO nanorods featuring core/shell or interconnected core/shell architectures on ZnO-seeded Si (100) substrates using the pulsed laser deposition (PLD) technique. The structural, morphological and luminescent properties of these ZnO nanorod samples were established. A ZnO emission band at 3.331 eV was observed in the core/shell and interconnected core/shell nanorod architectures and its origin linked to the defects observed at the crystalline/amorphous interface of the core/shell structure. This particular defect PL emission appears to be a new observation for ZnO. We have grown vertically aligned ZnO nanorods on PLD prepared ZnO-seeded Si substrates by catalyst-free vapour phase transport (VPT). The nanorods featured excellent optical properties and a coverage density higher than previously published data. The structural, morphological and luminescent properties of the seed layers and nanorods were inter-compared. Importantly, we also compared the near band edge emission of such VPT-and PLD-deposits, with a focus on the identification of the origin of the emission feature at 3.331 eV. We have researched the room temperature PLD growth of highly transparent and conductive ZnO and Al-doped ZnO (AZO) nanocrystalline thin films on flexible Zeonor plastic substrates. The trends for the growth rate, surface morphology, hydrophobicity and the structural, optical and electrical properties of 65 nm - 420 nm thick ZnO/AZO films grown on Zeonor substrates were analysed as a function of oxygen growth pressure (1-300 mTorr). The as-grown films showed highly reproducible deposition behaviour, and featured high transmittance, low-electrical resistance, optical smoothness, low residual stress, and hydrophobicity. The results presented in this thesis are discussed in the context of prospective
Metadata
Item Type:Thesis (PhD)
Date of Award:March 2016
Refereed:No
Supervisor(s):Mosnier, Jean-Paul and McGlynn, Enda
Subjects:Physical Sciences > Laser plasmas
Physical Sciences > Thin films
Engineering > Materials
Physical Sciences > Optoelectronics
Physical Sciences > Nanotechnology
Physical Sciences > Photonics
Physical Sciences > Semiconductors
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 License. View License
Funders:INSPIRE PRTLI Cycle 5
ID Code:21004
Deposited On:12 Apr 2016 10:51 by Jean-Paul Mosnier . Last Modified 19 Jul 2018 15:07
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