Patent ID: 8252660
Filing Date: 2012-08-28
Classification: H01L

Abstract:
1. A method of manufacturing a flash memory device, the method comprising: forming first auxiliary patterns arranged in a matrix form over a semiconductor substrate, wherein the matrix is defined by the first auxiliary patterns that are spaced apart from each other at a first interval and are arranged in a same column, and the first auxiliary patterns are spaced apart from each other at a second interval and are arranged in a same row; forming a second auxiliary pattern on sidewalls of each of the first auxiliary patterns; removing the first auxiliary patterns; etching the semiconductor substrate through an etch process using the second auxiliary patterns as an etch mask to form the first and second trenches in the semiconductor substrate, wherein the first trenches are arranged in parallel, and the second trenches are discontinuously arranged between the first trenches; removing the second auxiliary patterns; and forming first isolation structures within the respective first trenches and second isolation structures within the respective second trenches, thereby defining active regions by the first isolation structures and the second isolation structures.