Patent ID: 7638392
Filing Date: 2009-12-29
Classification: H01L

Abstract:
1. A method of forming a capacitor structure, comprising: providing a semiconductor material; forming a dielectric material over a portion of the semiconductor material, the dielectric material having a lateral periphery, at least some of the portion of the semiconductor material beneath the dielectric material being a capacitor channel region location and an entirety of the capacitor channel region location being below the dielectric material; forming a first capacitor electrode having at least a portion over the dielectric material; forming at least one conductively-doped diffusion region within the semiconductor material, at least a portion of said at least one diffusion region being laterally outward of the lateral periphery of the dielectric material, the at least one conductively-doped diffusion region being at least a part of a second capacitor electrode, the at least one conductively-doped diffusion region having a higher dopant concentration than the capacitor channel region location; forming an implant mask over a first portion of the capacitor channel region location to leave a second portion of the capacitor channel region location uncovered; while the implant mask is over the first portion of the capacitor channel region location, implanting dopant into the uncovered second portion of the capacitor channel region location; diffusing at least a portion of the implanted dopant into the first portion of the capacitor channel region location so that a concentration of the dopant in the first portion of the capacitor channel region location is substantially the same as a concentration of the dopant in the second portion of the capacitor channel region location; and wherein the implant mask is formed before forming the first capacitor electrode.