Patent ID: 8278688
Filing Date: 2012-10-02
Classification: H01L

Abstract:
1. A compound semiconductor device comprising: a carrier transit layer including GaN formed over a substrate; a carrier supply layer including GaN formed over the carrier transit layer; a source electrode and a drain electrode formed over the carrier supply layer; a first compound semiconductor layer formed over the carrier supply layer, the first compound semiconductor layer including N (nitrogen) and including a first that is located between the source electrode and the drain electrode a protective layer including GaN formed between the carrier supply layer and the gate electrode and directly in contact with the gate electrode, the protective layer being between the carrier supply layer and the source electrode and the drain electrode, the protective layer including a concave part within the first opening and directly in contact with the gate electrode in the concave part; a gate electrode extending from within the first opening and the concave part to above the first compound semiconductor layer; and an insulator layer including a second opening that is smaller than the first opening and larger than the concave part of the protective layer, and insulating the gate electrode and the first compound semiconductor layer within the first opening, wherein the gate electrode extends from within the second opening to above the first compound semiconductor layer.