Patent ID: 8993416
Filing Date: 2015-03-31
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: growing an AlN layer on a SiC substrate so that an upper face of the AlN layer having concavities and convexities; growing a first GaN layer on the concavities and convexities in the upper face of the AlN layer formed on the SiC substrate so that concavities and convexities are formed in an upper face of the first GaN layer; and growing a second GaN layer so that the grown second layer directly touches the concavities and convexities in the upper face of the first GaN layer under a condition in which X2 that is a ratio H/V for the second GaN layer is lower than X1 that is the ratio H/V for the first GaN layer, when a vertical growth rate is V and a horizontal growth rate is H, wherein a pressure in a growth of the first GaN layer is lower than a pressure in a growth of the second GaN layer.