Patent ID: 9620520
Date: 2017-04-11
CPC Classifications: H01L

Claim:
1. A method of manufacturing a semiconductor device, comprising: forming a first conductive film having first trenches formed therein, each of the first trenches extending in a first direction; forming a first sacrificial film filling the first trenches; etching the first sacrificial film to form second trenches, each second trench extending in the first direction; forming a second conductive film and a second sacrificial film on the second conductive film, the second conductive film being formed on an inner surface of each of the second trenches, and the second sacrificial film filling each of the second trenches; forming first slits dividing the first sacrificial film, the second conductive film and the second sacrificial film into a plurality of base patterns; forming a third conductive film having a horizontal portion covering the base patterns and protrusions extending from the horizontal portion so as to fill the first slits; and forming a pair of first holes and a pair of second holes, the first holes passing through the horizontal portion so as to expose the first sacrificial film of each of the base patterns, and the second holes passing through the horizontal portion so as to expose the second sacrificial film of each of the base patterns.