Patent ID: 8723261
Filing Date: 2014-05-13
Classification: H01L

Abstract:
1. A recessed gate transistor with cylindrical fins, comprising: a semiconductor substrate; two isolation regions disposed in the semiconductor substrate to define an active region therebetween; a gate structure disposed in the semiconductor substrate, wherein the gate structure comprises a upper part and a lower part, the upper part is disposed in the active region, and the lower part has a front fin disposed in one of the two isolation regions, at least one middle fin disposed in the active region, and a last fin disposed in the other one of the two isolation regions, and the front fin and the last fin are both cylindrical, and wherein the upper part electrically connects to the middle fin; a source doping region disposed in the active region at one side of the gate structure; and a drain doping region disposed in the active region at the other side of the gate structure.