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On the growth and characterisation of Zinc Oxide

Meaney, Alan Jason (2010) On the growth and characterisation of Zinc Oxide. PhD thesis, Dublin City University.

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Abstract

Optical, electrical and structural properties of ZnO grown via grown via PLD and VPT were examined. Both growth techniques were successful in producing nanostructured ZnO with thin films also produced with PLD. An epitaxial relationship to the substrate was found for all materials. A temperature-stepping growth process was identified as beneficial to overall material quality. Good quality nominally un-doped material with sharp near band edge (NBE) emission was achieved, demonstrating a FWHM of 1.9meV, compared to 0.7meV for single crystal samples. VPT and PLD nano-strucutres displayed a characteristic PL features due to the surface exciton, SX. Doped ZnO demonstrated p-type conductivity, with carrier concentrations as high as 4.10*16 cm−3 under illumination for N-ZnO. P-ZnO displayed a fast-decaying photoconductive effect. High concentrations of dopant were found disadvantageous to crystalline and optical quality, but evidence of ABX emission was observed with as much as 2.5 wt% of dopant. Li and Bi were also employed as dopant sources but neither produced evidence of a p-type film.

Item Type:Thesis (PhD)
Date of Award:July 2010
Refereed:No
Supervisor(s):Henry, Martin O.
Subjects:Physical Sciences > Optoelectronics
DCU Faculties and Centres: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:Science Foundation Ireland
ID Code:15664
Deposited On:05 Apr 2011 10:58 by Martin Henry. Last Modified 07 Oct 2013 14:47

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