Patent ID: 6706620
Filing Date: 2004-03-16
Classification: C30B,H01L

Abstract:
A method for fabricating a III nitride film, comprising the steps of:forming a lower region having a composition of Alx1Gax2Inx3N (x1+x2+x3=1, 0.5&lE;x1&lE;1.0); and forming an upper region having a composition of Aly1Gay2Iny3N (y1+y2+y3=1, 0&lE;y1&lE;x1âˆ’0.1), whereby a boundary face divides a given III nitride film into the lower region and the upper region and the difference in the Al content between the upper and lower regions is 10 atomic percent or more, and the full width at half maximum in X-ray rocking curve value of said lower region is 90 seconds or below.