Patent ID: 9070559
Filing Date: 2015-06-30
Classification: H01L

Abstract:
1. A pattern forming method, comprising: forming a hard mask layer above a process object; forming a core pattern with a predetermined shape above the hard mask layer; forming a spacer film above the hard mask layer where the core pattern is formed; etching back the spacer film such that a top face of the core pattern is exposed and a top face of the hard mask layer between the core patterns is exposed; forming an embedded layer above the hard mask layer so as to embed between the core patterns whose peripheral areas are surrounded by the spacer film; removing the core pattern and the embedded layer simultaneously to form a spacer pattern including the spacer film; processing the hard mask layer using the spacer pattern as a mask; and forming a pattern on the process object using the processed hard mask layer as a mask, wherein, in the formation of the embedded layer, a plurality of layers of embedded films are stacked, the embedded films being formed of organic films having different degree of shrinkage by irradiating light or applying heat, and in the plurality of layers of embedded films, an upper embedded film has a larger degree of the shrinkage than a degree of the shrinkage of a lowest embedded film.