Patent ID: 9692208
Date: 2017-06-27
CPC Classifications: H01S

Claim:
1. A method of manufacturing a semiconductor device comprising: forming a ridge on a semiconductor layer stacked on a substrate by forming a first mask layer having a predetermined shape on the semiconductor layer and removing a part of the semiconductor layer from an opening of the first mask layer; forming a second mask layer on a region from at least a bottom surface region of the ridge to the first mask layer on an upper surface of the ridge; removing a part of the second mask layer on the upper surface of the ridge to define an opening having a diameter smaller than a width of the ridge; removing the first mask layer on the upper surface of the ridge to expose the upper surface of the ridge; forming an electrode on the ridge so as to have a flat portion having a flat surface substantially parallel to the upper surface of the ridge and sloped portions on both sides of the flat portion with each of the sloped portions having a sloped surface that is sloped with respect to the upper surface of the ridge; removing the second mask layer; forming a third mask layer on the flat surface of the flat portion of the electrode; forming a protective film on a region from at least the bottom surface region of the ridge to the third mask layer on the upper surface of the ridge; removing the third mask layer and a part of the protective film on the upper surface of the ridge to expose the electrode; and forming a pad electrode at least on an upper surface of the electrode and the protective film.