Abstract
Preferred orientation GaN films are deposited on freestanding thick diamond films by electron cyclotron resonance plasma enhanced metal organic chemical vapor deposition (ECR-PEMOCVD). The TMGa and N2 are applied as precursors and different N2 flux is used to achieve high quality GaN films. The influence of N2 flux on the properties of GaN films is systematically investigated by x-ray diffraction analysis (XRD), atomic force microscopy (AFM), electron probe microanalysis (EPMA) and Hall Effect Measurement (HL). The results show that the high quality GaN films deposited at the proper N2 flux display a fine structural and electrical property and the Ga/N atomic ratio plays an important role in the electrical property of GaN films.
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