Patent ID: 7820512
Filing Date: 2010-10-26
Classification: H01L

Abstract:
1. A method comprising forming a semiconductor substrate having N-diffusion fins and P-diffusion fins, wherein the N-diffusion fins and P-diffusion fins traverse the substrate in a first direction; forming a gate stack over the semiconductor substrate; forming a gate electrode hard mask over the gate stack, wherein the gate electrode hard mask traverses the substrate in a second direction substantially perpendicular to the first direction and defines gate electrodes for a six transistor static random access memory (6T SRAM) that includes pull-up transistors, pull-down transistors and pass-gate transistors, wherein a first portion of the gate electrode hard mask utilized to define the pull-up transistor gate electrodes is formed over the P-diffusion fins, a second portion of the gate electrode hard mask utilized to define the pull-down transistor gate electrodes is formed over the N-diffusion fins and is connected to the first portion of the gate electrode hard mask, and a third portion of the gate electrode hard mask utilized to define the pass-gate transistor gate electrodes is formed over the N-diffusion fins, wherein each portion of the gate electrode hard mask has a substantially same width such that a same amount of each of the N-diffusion and the P-diffusion fins is covered thereby; forming spacers on sidewalls of the third portion of the gate electrode hard mask to form an augmented gate electrode hard mask where the width of the third portion of the augmented gate electrode hard mask is wider than the first and second portions of the augmented gate electrode hard mask; and etching the gate stack using the augmented gate electrode hard mask to form the gate electrodes, wherein the pass-gate transistor gate electrodes have a greater width than the pull-up transistor gate electrodes and the pull-down transistor gate electrodes so the pass-gate transistors have longer gate lengths than the pull-up transistors and the pull-down transistors.