Patent ID: 7682964

Claim:
A method for manufacturing a semiconductor device comprising: forming a lower conductive layer over a semiconductor substrate; forming a first intermediate insulating layer, wherein a first portion of the first intermediate insulating layer is directly over the lower conductive layer and a second portion of the first intermediate insulating layer is not over the lower conductive layer, wherein an upper surface of the first portion projects upwardly above an upper surface of the second portion of the first intermediate insulating layer; forming an upper conductive layer over the first and second portions of the first intermediate insulating layer so that the upper conductive layer crosses over the lower conductive layer, the upper conductive layer having a first section that is directly over the first portion and a second section that is directly over the second portion, an upper surface of the first section projects upwardly above an upper surface of the second section; forming a second intermediate insulating layer over the upper conductive layer; etching the second intermediate insulating layer to form a projecting portion of the second intermediate insulating layer that covers at least the first section of the upper conductive layer; and forming a contact hole through the projecting portion of the second intermediate insulating layer at a crossing portion of the lower conductive layer and the upper conductive layer directly over the first portion of the first intermediate insulating layer, wherein an aspect ratio of the contact hole is greater than 0.6.