Patent ID: 6858871
Filing Date: 2005-02-22
Classification: H01L,H01S

Abstract:
1. A semiconductor device comprising: a photodiode chip provided with an insulating film on a surface thereof; a laser chip die-bonded onto the photodiode chip, the photodiode chip receiving a light beam radiated from a back side of the laser chip for monitoring an output of a light beam radiated from a front side of the laser chip; wherein the insulating film of the photodiode chip is provided with a hole located beneath an electrode that die-bonds the laser chip onto the photodiode chip; two diffused layers, whose conductive types are different from each other, are formed on an area facing the hole of the insulating film in the photodiode chip, so that an anode of the laser chip and a substrate of the photodiode chip are not short-circuited; wherein the diffused layer, that is the surface side layer among two diffused layers, has a diffusion depth of 1.5 to 4.0 μm.