Patent ID: 7008755
Filing Date: 2006-03-07
Classification: H01L

Abstract:
1. A method for forming a planarized layer on a semiconductor substrate having concave and convex structures comprising: forming an interlayer dielectric film on the semiconductor substrate wherein the interlayer dielectric film has concave and convex portions in accordance with the concave and convex structures of the semiconductor substrate; forming a photoresist pattern on the interlayer dielectric film wherein a portion of the photoresist pattern on the interlayer dielectric film other than the convex portion of the interlayer dielectric film has a thickness of greater than h/n, where h and n are real numbers of one or more, in order to remove the convex portion of the interlayer dielectric film by a depth of approximately h; re-flowing the photoresist pattern so that the photoresist pattern formed from an edge of the convex portion of the interlayer dielectric film to a slant portion of the interlayer dielectric film between the convex portion and the concave portion has a thickness of below h/n; and etching the interlayer dielectric film by a depth of approximately h using an etchant having an etching selectivity of 1:n between the photoresist pattern and the interlayer dielectric film.