Patent ID: 9196731
Filing Date: 2015-11-24
Classification: H01L

Abstract:
1. A semiconductor device comprising: a substrate which includes a first face and a second face facing the first face and in which at least the first face comprises silicon; a buffer layer which comprises a first group III nitride semiconductor and includes a third face and a fourth face facing the third face and in which the third face faces the first face of the substrate; a semiconductor layer which comprises a second group III nitride semiconductor and includes a fifth face and a sixth face facing the fifth face and in which the fifth face faces the first face of the substrate via the buffer layer; a source electrode coupled to the sixth face of the semiconductor layer; a drain electrode coupled to the sixth face of the semiconductor layer; a gate electrode which faces the buffer layer via the semiconductor layer and which is formed between the source electrode and the drain electrode in a plan view; an interlayer insulating film which is formed so as to cover the source electrode, the drain electrode, and the gate electrode; a source pad which is coupled to the source electrode and faces the sixth face of the semiconductor layer via the interlayer insulating film; a drain pad which is coupled to the drain electrode and faces the sixth face of the semiconductor layer via the interlayer insulating film; and a gate pad which is coupled to the gate electrode and faces the sixth face of the semiconductor layer via the interlayer insulating film, wherein a trench is formed on the sixth face of the semiconductor layer so that the trench surrounds the source pad, the drain pad, and the gate pad in a plan view, the trench passes through the semiconductor layer and the buffer layer, and a bottom of the trench reaches at least an inside of the substrate, and the semiconductor device further comprises: wherein a distance from the first face of the substrate to the bottom of the trench is 100 nm or more in a thickness direction of the substrate.