Patent ID: 9691775
Date: 2017-06-27
CPC Classifications: H01L

Claim:
1. A method comprising: providing a structure, the structure including a hardmask layer disposed over a substrate and a first mandrel layer disposed over the hardmask layer; patterning an array of first mandrels into the first mandrel layer; forming an array of first spacers on sidewalls of the first mandrels; disposing a pattern layer over the array of first spacers, an etch stop layer over the pattern layer and a second mandrel layer over the etch stop layer; patterning an array of second mandrels into the second mandrel layer; forming an array of second spacers on sidewalls of the second mandrels; etching the array of second spacers into the pattern layer such that the second spacers are combined with the first spacers, the first and second spacers forming a pattern for an array of fins disposed on the hardmask layer; and etching the pattern into the substrate to form the array of fins.