Patent ID: 8110871
Filing Date: 2012-02-07
Classification: H01L

Abstract:
1. A semiconductor device comprising: an active region of a semiconductor substrate, the active region being elongated in a first direction; a recess formed in a channel region of the active region so that a width in the first direction of a lower part of the recess is greater than that of an upper part of the recess; a device isolation structure defining the active region, wherein the device isolation structure comprises opposing etched portions extending in a second direction, substantially orthogonal to the first direction, from the lower part of the recess, each of the opposing etched portions extending to a depth lower than an upper surface of the active region in the recess, and wherein the lower part of the recess has a width in the second direction that is greater than a width of the upper part of the recess in the second direction, and wherein a minimum width of the upper part of the recess in the second direction is greater than a maximum width of the active region in the recess; a gate insulating film formed over portions of the active region in the recess; and a gate electrode formed over portions of the gate insulating film and filling the recess and the etched portions of the device isolation structure.