Patent ID: 9355911
Filing Date: 2016-05-31
CPC Classification: H01L

Claim Text:
1. A fine-patterning method, comprising: forming a mask layer on an underlying layer, the mask layer including a first mask layer on the underlying layer and a second mask layer between the underlying layer and the first mask layer; forming a pair of sacrificial patterns on the mask layer; forming a connection spacer and first spacers, the connection spacer filling a space between the sacrificial patterns, the first spacers spaced apart from each other with the sacrificial patterns interposed therebetween, the first spacers covering respective outer side surfaces of the sacrificial patterns; etching the first mask layer using the first spacers and the connection spacer as an etch mask to form first mask patterns; forming second spacers to cover side surfaces of each of the first mask patterns; etching the second mask layer using the second spacers as an etch mask to form second mask patterns; and etching the underlying layer using the second mask patterns as an etch mask.