Patent ID: 8946011
Filing Date: 2015-02-03
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device, comprising the steps of: forming a first insulating layer to cover a first conductive layer over a substrate; forming a thin-film stack comprising a semiconductor layer over the first conductive layer with the first insulating layer interposed therebetween and an impurity semiconductor layer over the semiconductor layer; forming a stacked conductive film comprising a second conductive film and a third conductive film over the second conductive film, so that the stacked conductive film covers the thin-film stack; forming an etching mask over the stacked conductive film; performing etching on the stacked conductive film using the etching mask, so that a second conductive layer is formed using the second conductive film and a third conductive layer over the second conductive layer is formed using the third conductive film; performing side-etching on the third conductive layer so that a part of a top surface of the second conductive layer is exposed in a direction vertical to a surface of the substrate; performing etching on the thin-film stack, so that the semiconductor layer in a portion that does not overlap with the etching mask is exposed; removing the etching mask; forming a second insulating layer over the first insulating layer, the etched thin-film stack, the second conductive layer, and the etched third conductive layer; forming a contact hole in the second insulating layer, so that the contact hole overlaps with the part of the top surface of the second conductive layer; and forming a fourth conductive layer over the second insulating layer so that the fourth conductive layer is connected to the part of the top surface of the second conductive layer through the contact hole.