Patent ID: 7443901

Claim:
An opto-semiconductor device comprising: an opto-semiconductor element including a semiconductor substrate, a multilayered semiconductor portion formed on a first surface of the semiconductor substrate and having a resonator for generating a laser, a first electrode having a multiplicity of conductive layers stacked on the multilayered semiconductor portion, and a second electrode formed on a second surface on the opposite side of the semiconductor substrate far from the first surface; and a support substrate with a first surface thereof formed with an element fixing portion having a conductive layer for fixing the first electrode of the opto-semiconductor element; wherein the first electrode of the opto-semiconductor element is connected to the element fixing portion of the support substrate through a bonding material, and the bonding material and the conductive layers making up the first electrode react with each other to form a reaction layer; and wherein the difference in the coefficient of thermal expansion between the semiconductor substrate and the support substrate coupled to the semiconductor substrate is not more than ±50%, and wherein a second barrier metal layer not reacting with the bonding material is formed on the inside of the uppermost conductive layer of the first electrode, and the uppermost conductive layer reacts with the bonding material thereby to form the reaction layer.