Patent ID: 9153942
Filing Date: 2015-10-06
Classification: G02B,H01S

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a laser section on a portion of a surface of a substrate, said laser section having side walls transverse to said surface of said substrate, wherein said laser section includes an active layer, an upper semiconductor layer on said active layer, and a mask on said upper semiconductor layer; forming a compound semiconductor layer of an indium-containing material on said surface of said substrate and on both sides of said laser section, in contact with said side walls of said laser section, wherein said compound semiconductor layer includes projections projecting away from said surface of said substrate and located adjacent said side wall of said laser section; wet etching and removing said projections with an etchant containing hydrobromic acid and acetic acid, thereby planarizing said compound semiconductor layer, and producing a (111)A surface in said upper semiconductor layer, under said mask; after the wet etching, removing the mask; and after removing the mask, forming a contact layer in contact with said upper semiconductor layer and said compound semiconductor layer.