Patent ID: 8846304
Filing Date: 2014-09-30
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: providing a semiconductor substrate comprising a first region and a second region; forming an object layer on the substrate across the first region and the second region; forming a buffer layer on the object layer; forming a first photoresist pattern on the buffer layer such that the buffer layer in the first region is exposed; etching the buffer layer using the first photoresist pattern as a mask to form a buffer pattern in the first region; forming a spacer on the object layer in the first region corresponding to a sidewall of the buffer pattern; forming a mask layer on the object layer across the first region and the second region; forming a second photoresist pattern on the mask layer on the object layer such that the mask layer in the first region is exposed; etching the mask layer on the object layer using the second photoresist pattern as a mask to form a first mask pattern through which the spacer in the first region is partially exposed and with which the object layer in the second region is still covered; etching a portion of the spacer using the first mask pattern as a mask to form a spacer pattern in the first region; forming a third photoresist pattern on the first mask pattern in the second region; etching the first mask pattern using the third photoresist pattern as a mask to form a second mask pattern arranging on the object layer in the second region; and etching the object layer using the spacer pattern and the second mask pattern.