Transistor in semiconductor devices

A transistor in a semiconductor device, comprising:

• a semiconductor substrate;
• a gate oxide film formed on said semiconductor substrate;
• a gate electrode electrically isolated from said semiconductor substrate by said gate oxide film and connected to a first power supply source;
• a hard mask layer formed on said gate electrode;
• a source formed in the semiconductor substrate at a first side of said gate electrode;
• a drain formed in the semiconductor substrate at a second side of said gate electrode and formed oppositely to said source;
• an oxide film formed at the sidewall of the gate electrode and the surface of the semiconductor substrate;
• an auxiliary electrode formed at the first and second sides of said gate electrode, electrically isolated from said gate electrode, said source and said drain by means of said oxide film and connected to a second power supply source, wherein the upper side of the auxiliary electrode is located below an upper side of the hard mask layer;
• and
• an insulating film spacer formed at the sidewall of a portion of the hard mask layer and the outer surface of the auxiliary electrode.