Patent ID: 9691626
Date: 2017-06-27
CPC Classifications: H01L

Claim:
1. A method comprising: providing a structure, the structure having an etch mask layer disposed over a pattern layer and the pattern layer disposed over a dielectric layer; disposing a first and a second trench plug in the etch mask layer, the first and second trench plugs having different material compositions; utilizing a self-aligned double patterning process to form an array of self-aligned spacers disposed on sidewalls of mandrels, the spacers and mandrels defining alternating beta and gamma regions extending normally through the dielectric layer, a gamma region extending through a portion of the first trench plug, a beta region extending through a portion of the second trench plug; selectively etching the structure to remove any portion of the first trench plug from the beta regions and any portion of the second trench plug from the gamma regions; selectively etching the structure to form a pattern in the pattern layer, the pattern including: