Patent ID: 8071484
Filing Date: 2011-12-06
Classification: H01L

Abstract:
1. A method of forming a fine pattern, comprising: providing a substrate; forming a first mask pattern comprising silicon nitride on the substrate; forming a reaction promoting layer comprising hexamethyldisilazane (HMDS) along outer surfaces of the first mask pattern and the substrate exposed between the first mask pattern on the substrate having the first mask pattern; forming a reactive layer comprising a silicon oxide polymer on the reaction promoting layer; reacting the reactive layer with the first mask pattern, employing a chemical attachment process, thereby forming sacrificial layers along outer walls of the first mask pattern; providing that a portion of the reactive layer is unreacted after completion of the chemical attachment process, removing the unreacted portion to expose the sacrificial layers; forming a second mask pattern between the sacrificial layers adjacent to the sidewalls of the first mask pattern which are facing each other; removing the sacrificial layers to expose the first and second mask pattern; and etching the substrate using the first and second mask pattern as an etching mask.