Patent ID: 7575989
Filing Date: 2009-08-18
Classification: H01L

Abstract:
1. A method of manufacturing a transistor comprising: depositing a first insulating layer over a semiconductor substrate; forming a trench by etching the first insulating layer and the semiconductor substrate; performing a first ion implantation into the semiconductor substrate; depositing a second insulating layer and a first conductive layer over the semiconductor substrate on which the trench is formed; planarizing the second insulating layer and first conductive layer to form a trench gate; depositing a second conductive layer over the trench gate and the semiconductor substrate; forming a mask pattern having a width wider than the trench gate over the second conductive layer; patterning the second conductive layer, the first insulating layer and an upper portion of the semiconductor substrate using the mask pattern; removing the mask pattern; performing a second ion implantation using the second conductive layer as a mask to form a source/drain region; and heat treating the semiconductor substrate to form a silicide layer over the second conductive layer and over an exposed surface portion of the semiconductor substrate.