Patent ID: 8044433
Filing Date: 2011-10-25
Classification: H01L

Abstract:
1. A semiconductor device comprising: a substrate; a GaN-based semiconductor layer formed on the substrate; a gate electrode embedded in the GaN-based semiconductor layer; a source electrode and a drain electrode formed on opposing sides of the gate electrode; a first recess portion formed between an embedded portion of the gate electrode and the source electrode; and a second recess portion formed between the embedded portion of the gate electrode and the drain electrode, wherein the GaN-based semiconductor layer in the first recess portion has a thickness larger than that of the GaN-based semiconductor layer in the second recess portion; wherein a first part of the gate electrode of the drain electrode side is formed directly on the second recess portion and is deeper than a second part of the gate electrode formed directly on the first recess portion; and wherein the first recess portion has a first bottom plane, the second recess portion has a second bottom plane and the first bottom plane is higher than all parts of the second bottom plane, and wherein the embedded portion of the gate electrode has a bottom plane which is lower than the first bottom plane of the first recess portion and the second bottom plane of the second recess portion.