Patent ID: 9508729
Filing Date: 2016-11-29
CPC Classification: G11C,H01L

Claim Text:
1. A method comprising: forming a first static random access memory (SRAM) cell of a first cell size on a substrate, wherein the forming of the first SRAM cell includes forming first n-type fin field-effect transistors (nFinFETs) using a first nFinFET formation process, wherein one of the first nFinFETs has a first gate stack; and forming a second SRAM cell of a second cell size on the substrate, wherein the forming of the second SRAM cell includes forming second nFinFETs using a second nFinFET formation process different from the first nFinFET formation process, wherein the second cell size is greater than the first cell size, wherein one of the second nFETs has a second gate stack different from the first gate stack, wherein the second gate stack is different from the first gate stack in at least one of gate electrode material and gate dielectric material.