Patent ID: 7514330
Filing Date: 2009-04-07
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device having a semiconductor substrate having an active area defined by two areas of isolation layer formed in the semiconductor substrate, the method comprising steps of: etching at least two predetermined parts of the active area to a first depth forming first recesses; filling a conductive layer in each of the first recesses; etching the active area between two conductive layers of the first recesses and a portion of each conductive layer adjoining the etched active area to a second depth forming a second recess having a sidewall and a bottom surface, forming a source area in a portion of the semiconductor substrate outside the second recess, wherein the source area is in electrical contact with the understepped gate; and forming a drain area in a portion of the semiconductor substrate below the second recess bottom surface, wherein the drain area is in electrical contact with the understepped gate.