| Type of Document |
Master's Thesis |
| Author |
Wellenius, Patrick , |
| Author's Email Address |
pwellen@unity.ncsu.edu |
| URN |
etd-01042006-015801 |
| Title |
Nitrogen Doping and Ion Beam Processing of Zinc Oxide Thin Films |
| Degree |
Master of Science |
| Graduate Program |
Electrical Engineering |
| Advisory Committee |
| Advisor Name |
Title |
| John Muth |
Committee Co-Chair |
| Robert Kolbas |
Committee Member |
| Salah Bedair |
Committee Member |
|
| Keywords |
- IBNTD
- optical properties
- transmutation
- ZnO
- HIBS
- helium
- PLD
- RBS
- electronic properties
|
| Date of Defense |
2005-12-14 |
| Availability |
unrestricted |
Abstract
The modification of single crystal epitaxial ZnO thin films grown by Pulsed Laser Deposition on c-axis oriented sapphire substrates by Ion Beam Processing was investigated. Nitrogen doping of the films was attempted using nuclear transmutation using the 16O (3He, 4He) 15O reaction at 6.6 MeV. The 15O product is unstable and decays to 15N after several minutes by positron emission. There are several potential advantages to using nuclear transmutation including producing nitrogen atoms on the correct lattice site for doping and reduced crystal damage as compared to conventional ion beam implantation. In the experiments in this thesis the doping levels achieved ~1014 cm-3 were too low to be expected to dope the films to p-type. However several beneficial effects due to the ion beam processing were observed, including large increases in resistivity, reduction of defect luminescence, and substantial increases in the response of photoconductive detectors. In addition to desired effects in some films it was also found that in some films bubble like structures approximately 10 ìm in diameter were formed where the thin film delaminated from the surface. It was assumed that mechanism for the bubble formation was the build up of helium gas at the sapphire/ZnO interface.
|
| Files |
| Filename |
Size |
Approximate Download Time
(Hours:Minutes:Seconds)
|
| 28.8 Modem |
56K Modem |
ISDN (64 Kb) |
ISDN (128 Kb) |
Higher-speed Access |
| |
etd.pdf |
5.96 Mb |
00:27:36 |
00:14:11 |
00:12:25 |
00:06:12 |
00:00:31 |
|
