Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5369671 | Applied Surface Science | 2007 | 5 Pages |
Ge1âxCx films deposited by using a medium frequency magnetron sputtering technique (MFMST) were analyzed with X-ray photoelectron and Raman spectroscopy. The deposited Ge1âxCx films consist of C, Ge, GeC and GeOy. The GeC content in the Ge1âxCx films linearly decreases, and the C content linearly increases with increasing deposition temperature from 150 to 350 °C. The GeC content decreases from 11.6% at a substrate bias of 250 V to a lowest value of 9.6% at 350 V, then increases again to 10.4% at 450 V. While the C content increases from 49.0% at the bias of 250 V to a largest value of 58.0% at 350 V and then maintains this level at 450 V. It is found that selecting a bias parameter seems more effective than deposition temperature if we want to obtain a higher content of GeC in the deposited films. In addition, a new method is presented in this paper to estimate the changes of GeC content in the Ge1âxCx films by observing the shifts of Ge-Ge LO phonon peak in Raman spectra for the Ge1âxCx films. The related mechanism is also discussed in this paper.