Patent ID: 8809941

Claim:
A semiconductor device comprising: a semiconductor substrate including device isolation structures to define an active region therebetween, wherein the active region of the semiconductor substrate has a stepped profile, the stepped profile of the active region is arranged to form a recessed channel between gate recesses, and the gate recesses are each formed in the semiconductor substrate for forming a respective recess gate thereon; recessed junction regions that are each formed in the semiconductor substrate between a respective one of the gate recesses and a respective one of the device isolation structures and arranged to electrically contact the recessed channel; and a first source-drain region which is located under each of the recessed junction regions, wherein the highest point of the first source-drain region is lower than those of the device isolation structures and the highest point of the active region between the gate recesses is lower than the highest points of the active region in areas between each of the gate recesses and the respective one of the device isolation structures.