Patent ID: 6768137
Filing Date: 2004-07-27
Classification: H01L

Abstract:
An optical semiconductor element comprising:a substrate of GaAs having a first surface and a second surface opposite to each other; a buffer layer of InjGa1-jAs1-kNk (0&lE;j&lE;1,0.002&lE;k&lE;0.05) formed on said first surface of said substrate; a first conductive type clad layer formed on said buffer layer; an active layer formed on said first conductive type clad layer and comprising a well layer of InzGa1-zAs (0&lE;z&lE;1), said well layer having a smaller bandgap than said first conductive type clad layer, said active layer having a larger thickness than its critical thickness for said semiconductor substrate based upon equilibrium theories; and a second conductive type clad layer formed on said active layer and having a larger bandgap than said well layer.