Patent ID: 7687852

Claim:
A semiconductor device having recess gates comprising: a semiconductor substrate having a surface; an inverse, asymmetric triangular recess trench formed in the semiconductor substrate, the inverse triangular recess trench having a first sidewall and a second sidewall, the first sidewall being perpendicular to the surface of the semiconductor substrate and the second sidewall being sloped with respect to the surface of the semiconductor substrate; first and second regions formed in the semiconductor substrate to have different heights and opposed to each other so that a channel is located along the first sidewall and the second sidewall; a gate insulating film having a designated thickness formed on an exposed side of the inverse triangular recess trench; a gate conductive film and a gate metal film sequentially formed on the gate insulating film so that the gate conductive film and a gate metal film fill the inverse triangular recesses and protrude from the surface of the semiconductor substrate; first and second junction regions formed at the first and second regions by ion implantation; and, a first impurity region located beneath the first sidewall, a second impurity region located beneath the second sidewall, and a third impurity region located beneath a bottom of the inverse triangular recess trench between the first and the second impurity regions so that the first impurity region, the second impurity region, and the third impurity region adjust threshold voltage.