Patent ID: 9536750
Date: 2017-01-03
CPC Classifications: H01L

Claim:
1. A method of making a semiconductor device, the method comprising: disposing a hard mask stack on a substrate, the hard mask stack comprising a first hard mask layer in contact with the substrate, an amorphous silicon layer on the first hard mask layer, and a second hard mask layer on the amorphous silicon layer; disposing an oxide layer and a neutral layer on the second hard mask layer; removing a portion of the oxide layer and the neutral layer to expose a portion of the second hard mask layer; forming a guiding pattern by selectively backfilling a polymeric material in the exposed portion of the second hard mask layer, the guiding patterning comprising the neutral layer and the polymeric material; forming a self-assembled block copolymer layer on the guiding pattern; removing a portion of the block copolymer layer to form an etch template comprising the polymeric material that is remaining; etching the neutral layer, the oxide layer, the second hard mask layer, the amorphous silicon layer, and the first hard mask layer to transfer a pattern from the etch template into the neutral layer, the oxide layer, the second hard mask layer, the amorphous silicon layer, and the first hard mask layer; and etching the substrate to transfer the pattern from the hard mask stack into the substrate and form a first fin comprising a first portion of the first hard mask layer disposed on the first fin and a second fin comprising a second portion of the first hard mask layer disposed on the second fin, the second portion being thicker than the first portion.