Patent ID: 9748138
Date: 2017-08-29
CPC Classifications: H01L

Claim:
1. A method, comprising: performing a first patterning process to a material layer that is disposed over a substrate, thereby forming first and second openings in the material layer; and performing a second patterning process to the material layer to form a third opening based on the first opening and a fourth opening based on the second opening; wherein the first and the second patterning processes are performed such that: the first, second, third, and fourth openings each have respective lengths that are measured in a first direction and respective widths that are measured in a second direction different from the first direction; the length of the first opening is approximately equal to the length of the second opening; the width of the first opening is approximately equal to the width of the second opening; and the length of the third opening is greater than the length of the fourth opening.