Patent ID: 8058127

Claim:
A method of manufacturing a power semiconductor device, comprising: growing a first type epitaxial layer ( 102 ) on a first type high-concentration silicon substrate ( 101 ) and growing an initial oxide film ( 103 ) at a thickness ranging from 5000 to 10000; applying a photoresist ( 104 ) on the initial oxide film ( 103 ) and performing photolithography and development, thus forming a trench pattern; etching an exposed area of the initial oxide film ( 103 ) using the trench pattern, removing the photoresist ( 104 ), forming a screen oxide film ( 105 ) for ion implantation on an exposed area of the epitaxial layer ( 102 ), and forming a second type body region ( 106 ) through ion implantation and a drive-in process; forming a first type high-concentration source region ( 107 ) through ion implantation; laminating a spacer oxide film and forming a spacer ( 111 ) through dry etching; subjecting a portion of the epitaxial layer ( 102 ) corresponding to a trench gate electrode, which is exposed upon formation of the spacer, to trench etching, thus forming a trench hole ( 112 ), cleaning an inside of the trench hole ( 112 ), growing a sacrificial oxide film (not shown), removing the sacrificial oxide film through wet etching, and then growing a gate oxide film ( 113 ); laminating polysilicon ( 114 ), which is doped to a high concentration to form the gate electrode, thus filling the trench hole ( 112 ), removing the doped polysilicon through polysilicon etch back or CMP (Chemical Mechanical Polishing) such that the initial oxide film is exposed, and forming an interlayer insulating film ( 115 ); laminating a photoresist for forming a contact pattern through second photolithography, and forming the pattern through the photolithography; etching the oxide film of each of the gate electrode and the source region, and forming a second type high-concentration source region; and conducting a process of applying a metal for a high-concentration source and a gate electrode, thus forming a metal electrode ( 116 ).