Patent ID: 8946038
Filing Date: 2015-02-03
Classification: H01L

Abstract:
1. A method of forming one or more diodes in a fin field-effect transistor (FinFET) device, said method comprising: forming a hardmask layer having a fin pattern, said fin pattern including an isolated fin area having low fin density, a fin array area having a higher fin density, and a FinFET area; etching a plurality of fins into a semiconductor substrate using the fin pattern; depositing a dielectric material over the semiconductor substrate to fill spaces between the plurality of fins; planarizing the semiconductor substrate to expose the hardmask layer; implanting a p-type dopant into the fin array area and portions of the FinFET area to form p-wells; implanting an n-type dopant into the isolated fin area, a portion of the fin array area surrounding the p-well and portions of the FinFET area to form n-wells; and annealing the semiconductor substrate, wherein the n-well in the isolated fin area and the n-well in the portion of the fin array area have different depths.