|Budget Amount *help
¥2,100,000 (Direct Cost : ¥2,100,000)
Fiscal Year 1990 : ¥300,000 (Direct Cost : ¥300,000)
Fiscal Year 1989 : ¥1,800,000 (Direct Cost : ¥1,800,000)
In this investigation, planar magnetron sputtering system with obliquely facing two targets was constructed, and films of AlN and ZnO were prepared. Some properties of these films were investigated and the utility of this sputtering system at the sputtered film preparation was studied. At first, in AlN film preparations, it was demonstrated that discharge was maintained even at gas pressures of the order of 10^<-4> Torr in N_2 atmosphere. Obtained AIN films were all c-axis oriented(c-axis is normal to the substrate), and the degree of c-axis orientation was high. The sputtering was stable, and even at low gasubstrate temperature of 50ﾟC, c-axis oriented AlN films were prepared. These results showed that this sputtering system is effective in the film preparation. Highly c-axis oriented films were obtained at the gas pressures of the order of 10^<-3> Torr. However, at the pressures below 1X10^<-3> Torr, the film degradation such as the decrease of c-axis orientation, film coloring and film peeling were observed. from the results of optical transmittance and film composition estimation by energy-dispersion X-ray spectroscopy, these film degradation were related to the, excess of N atoms in the film growth. This is thought to be due to the implantation of N ions into the film at lower gas pressures. It was also found that application of magnetic field in front of the substrate is effective to increase the degree of c-axis orientation. This indicates that the exposure of AlN film to the plasma influences the film quality.
In ZnO film preparation by the sputtering of Zn targets in O^2 gas, film bombardment by energetic O^- and O atoms should be avoided to obtain highly c-axis oriented ZnO films. Therefore. in, the obliquely facing target system, the inclination angle of the target is limited in a certain angle.