Awang, R. and Rahman, Saadah Abdul (2008) Effects of hydrogen and helium dilution on the optical band gap and photoluminescence of DC PECVD hydrogenated amorphous carbon films. Sains Malaysiana, 37 (3). pp. 265-269. ISSN 0126-6039,
Full text not available from this repository.Abstract
A series of hydrogenated amorphous carbon (a-C:H) thin films were deposited using home-built direct-current (DC) plasma enhanced chemical vapour deposition (PECVD) system. The a-C:H thin films were deposited using pure methane (CH 4) gas diluted either with hydrogen (H) or helium (He). The effects of hydrogen and helium dilution on the photoluminescence (PL) properties and optical band gap (E-04) were studied. The dependence of PL properties and optical energy gap on the film thickness has also been investigated. The characterization techniques used were optical transmission and photoluminescence spectroscopies. The sp(2) cluster sizes were determined from Raman spectra are in the range of 5 to 7 nm. Hydrogen and helium. dilution of methane strongly influences the PL efficiency of the a-C:H films. The PL efficiency are enhanced with increase in film thickness for a-C:H films prepared both from H and He diluted CH4. The optical energy gap of these films decreases with increase in H or He dilution and film thickness.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Uncontrolled Keywords: | hydrogenated amonphous carbon hydrogen and helium dilution photoluminescence optical band gap |
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science > Department of Physics |
| Depositing User: | miss munirah saadom |
| Date Deposited: | 15 Jul 2013 06:56 |
| Last Modified: | 19 Mar 2019 09:08 |
| URI: | http://eprints.um.edu.my/id/eprint/7346 |
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