Patent ID: 9722052
Date: 2017-08-01
CPC Classifications: H01L

Claim:
1. A method of forming semiconductor fins comprising: providing an array of sacrificial fins having gaps therebetween on a surface of semiconductor substrate; forming a hard mask layer on the surface of the sacrificial fins and in the gaps; providing a fin cut mask on the hard mask layer to cover a portion of the sacrificial fins and partly cover at least one sacrificial fin; forming trenches in the hard mask to expose the surface of the semiconductor substrate by selectively removing the sacrificial fins not covered by the fin cut mask and by selectively removing the portion of the at least one sacrificial fin not partly covered by the fin cut mask; removing the fin cut mask and forming spacers on the sidewalls of the trenches and forming a plug in the trench formed by the removal of the portion of the at least one sacrificial fin not partly covered by the fin cut mask; and growing semiconductor fins in the trenches having the spacers on the sidewalls from the exposed surface of the semiconductor substrate upward.