Patent ID: 7750378
Filing Date: 2010-07-06
Classification: H01L

Abstract:
1. A field effect transistor comprising: a substrate; a gate electrode on the substrate; an asymmetrical L-shaped gate insulating layer, the gate insulating layer consisting of a first portion which extends between a lower side of the gate electrode and the substrate, and a contiguous second portion which extends up along a first side of the gate electrode; a source layer on the substrate at one side of the gate electrode; a drain layer on the substrate at the other side of the gate electrode; a first insulating layer between a) the second portion of the gate insulating layer and b) the source layer; second and third insulating layers between the gate electrode and the drain layer the second insulating layer being disposed against a second side of the gate electrode, and the third insulating layer being disposed against a side of the drain layer and a side of the second insulating layer; a source junction on the substrate beneath the first insulating layer and the source layer; a drain junction on the substrate beneath the drain layer; and an extending region configured as part of the drain junction and configured to be thinner than a main portion of the drain junction and formed in the substrate beneath the third insulating layer, the first portion of the gate insulating layer separating the extending region and the third insulating layer wherein the L-shaped gate insulating layer which has a different material than the first, second, and third insulating layers.