Patent ID: 9419083
Filing Date: 2016-08-16
CPC Classification: H01L

Claim Text:
1. A field effect transistor structure, comprising: a semiconductor having a source region, a drain region, and a gate contact region disposed between the source region and the drain region; a gate electrode having a stem section extending from a top section of the gate electrode to, and in Schottky contact with, the gate contract region; wherein the stem section has an upper portion terminating at the top portion of the gate and a bottom portion narrower than the upper portion, the bottom portion terminating at the gate contact region; wherein the bottom portion the stem has a step between the upper portion of the stem section and the bottom portion of the stem section in only one side of the stem section including a pair of dielectric spacers disposed on sides of the stem section, the pair of dielectric spacers having different etch rates to a predetermined etchant, one of the pair of dielectric spacers being shorter than the other one of the dielectric spacers.