Kamarudzaman, Anas and Shuhaimi, Ahmad and Azman, Adreen and Omar, Al-Zuhairi and Supangat, Azzuliani and Talik, Noor Azrina (2020) Positioning of periodic AlN/GaN multilayers: Effect on crystalline quality of a-plane GaN. Materials Science in Semiconductor Processing, 105. p. 104700. ISSN 1369-8001, DOI https://doi.org/10.1016/j.mssp.2019.104700.
Full text not available from this repository.Abstract
We report the effect of 40 pairs of periodic AlN/GaN multilayers on the a-plane undoped-gallium nitride (ud-GaN) grown on r-plane flat sapphire substrate via metal-organic chemical vapor deposition. The influence of the position of the periodic AlN/GaN multilayers was seen to enhance the crystalline quality and surface morphology of the a-plane ud-GaN. The surface morphology analysis via atomic force microscopy has shown that the surface roughness was as low as 1.01 nm upon the insertion of the 40 pairs of periodic AlN/GaN multilayers with an optimum position. The on- and off-axis x-ray ω-scan rocking curves illustrate the enhancement in crystalline quality with a reduction of the full width at half maximum from 0.34° to 0.25° along [0001] direction and 0.91°–0.47° along [1–100] direction. The grown a-plane GaN with periodic AlN/GaN multilayers was seen to exhibit different relaxation strain states at different position as seen from the Raman spectroscopy. Room-temperature photoluminescence spectra shows that the sample with optimum periodic AlN/GaN multilayers position exhibits the lowest yellow and blue luminescence band. © 2019
| Item Type: | Article |
|---|---|
| Funders: | Malaysia Ministry of Education (MOE) under Long-Term Research Grant (LRGS) project no LR001-2016A (um.0000021/HME.LS), MYPhD (B) scholarship, University Malaya Postgraduate Research Grant ( PG116-2015B ), UMRG Programme ( RP039A-18AFR ) |
| Uncontrolled Keywords: | a-plane GaN; Non-polar GaN; AlN/GaN multilayers; MOCVD |
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics |
| Divisions: | Faculty of Science > Department of Physics |
| Depositing User: | Zanaria Saupi Udin |
| Date Deposited: | 26 Mar 2011 07:01 |
| Last Modified: | 11 Nov 2019 04:15 |
| URI: | http://eprints.um.edu.my/id/eprint/218 |
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