Patent ID: 9647022
Date: 2017-05-09
CPC Classifications: H01L

Claim:
1. A method of implanting a substrate, comprising: forming a first material over a substrate, wherein the substrate comprises a gate electrode layer, a resist protection oxide layer disposed onto the gate electrode layer, and an etch stop layer disposed onto the resist protection oxide layer; selectively etching the first material to define a location of a pillar of sacrificial material; forming a second material at a location abutting sidewalls of the first material, resulting in the pillar of sacrificial material arranged within a first opening in a surrounding masking material; removing the pillar of sacrificial material to form a masking structure comprising a trench surrounded by the masking material, wherein the masking structure is disposed onto the etch stop layer; selectively implanting the substrate according to the masking structure; and removing the masking structure after selectively implanting the substrate.