Patent ID: 7186621
Filing Date: 2007-03-06
Classification: H01L

Abstract:
1. A method of forming a silicon based negative differential resistance (NDR) field effect transistor (FET) comprising the steps of: (a) providing a substrate; (b) forming a first NDR region for the NDR FET in a first portion of said substrate using a p-type dopant implant with a first dose of approximately 1 to 3*10 (c) after step (b), using an n-type dopant implant with a second dose, which is less than that of the first dose, in said first portion of said substrate to adjust a threshold voltage characteristic of the NDR FET and provide a peak-to-valley current ratio (PVR) in excess of 10 for the NDR FET; (d) forming a gate insulating layer for the NDR FET over said first portion of said substrate; (e) forming a gate electrode for the NDR FET; (f) forming a source region and a separate drain region for the NDR FET adjacent to said gate electrode, said source region and drain region being coupled through an NDR FET channel located in said first portion of said substrate.