Patent ID: 7368371

Claim:
A method of forming silicon carbide Schottky diode, the method comprising the steps of: providing a silicon carbide substrate with a first conductive impurity heavily doped and having a silicon carbide drift layer with said first conductive impurity doped formed thereon; forming a silicon layer on said drift layer; performing an ion implant using second conductive impurities as ion species to doped said silicon layer; patterning said silicon layer to define an active region where said drift layer is exposed; performing a thermal oxidation to form a thick oxide layer by oxidizing said silicon layer, form a thin oxide layer by oxidizing said drift layer of exposed portion and forming guard rings by driving in said second conductive impurities using said silicon layer as an impurity diffusion source; performing a dip-etching to remove said thin oxide layer to bare said drift layer forming a top metal layer on said thick oxide layer and said bared drift layer; patterning said top metal layer to form anode electrode; and removing all layers formed on a rear surface of said silicon carbide substrate until said silicon carbide substrate is exposed; and forming a backside metal layer on said rear surface to be as a cathode electrode.