Patent ID: 9224830
Filing Date: 2015-12-29
Classification: H01L

Abstract:
1. A field effect transistor, comprising: a source electrode and a drain electrode provided spaced apart from each other on a substrate; and a ‘+’-shaped gate electrode provided on a portion of the substrate located between the source and drain electrodes, wherein the ‘+’-shaped gate electrode comprises: a T-shaped gate electrode portion; and an additional gate electrode portion provided on the T-shaped gate electrode portion, wherein: the additional gate electrode portion is provided on a head portion of the T-shaped gate electrode portion in such a way that it is overlapped with a leg portion of the T-shaped gate electrode portion in plan view; the additional gate electrode portion has a width that is greater than that of the leg portion of the T-shaped gate electrode portion; the additional gate electrode portion comprises at least one of nickel, gold, platinum, titanium, chromium, titanium/tungsten alloy, or platinum silicide; and a lower surface of the head portion and a sidewall of the leg portion are exposed to an outside, forming an empty space defined collectively by the lower surface of the head portion, the sidewall of the leg portion and the substrate.