Patent ID: 9117478
Filing Date: 2015-08-25
Classification: G11B

Abstract:
1. A patterning method, comprising: forming a first copolymer layer on a substrate having a processing layer, the first copolymer layer comprising a first diblock copolymer including two polymeric portions which are phase incompatible with each other; annealing the first copolymer layer to thereby generate a first phase pattern in the first copolymer layer, the first phase pattern including a first dispersed phase and a first continuous phase that surrounds the first dispersed phase; etching the first copolymer layer to form a first topographic pattern corresponding to the first phase pattern; forming a second copolymer layer over the first topographic pattern, the second copolymer layer comprising a second diblock copolymer including two polymeric portions which are phase incompatible with each other; annealing the second copolymer layer to thereby generate a second phase pattern in the second copolymer layer, the second phase pattern offset from the first topographic pattern in a direction parallel to the substrate and including a second dispersed phase and a second continuous phase that surrounds the second dispersed phase; etching the second copolymer layer to form a second topographic pattern corresponding to the second phase pattern; and transferring the first and second topographic patterns to the processing layer.