Patent ID: 7354846

Claim:
A method of fabricating a submount substrate for mounting a light emitting device, comprising the steps of: preparing a substrate doped with first polar impurities; injecting and diffusing second polar impurities having the polarity different from that of the first polar impurities into top and bottom surfaces of the substrate to form first and second diffusion layers; forming a mask layer on the top surface of the substrate such that part of the first diffusion layer is exposed therethrough; etching the exposed first diffusion layer and the substrate to form a groove, and then removing the mask layer; forming an insulating layer on the groove and the first diffusion layer exposed by removing the mask layer therefrom; etching the insulating layer formed on the first diffusion layer and the groove to form a first contact region through which the first diffusion layer is exposed and a second contact region through which the substrate is exposed; and forming a first electrode line connected to the first diffusion layer through the first contact region and a second electrode line connected to the substrate through the second contact region.