Patent ID: 10026893

Abstract:
A method for producing a memory device includes depositing a second interlayer insulating film on a substrate, forming contact holes, and depositing a second metal and a nitride film. The second metal and the nitride film are removed to form pillar-shaped nitride layers, and to form lower electrodes surrounding the pillar-shaped nitride layers. The second interlayer insulating film is etched back to expose upper portions of the lower electrodes. The upper portions of the lower electrodes surrounding the pillar-shaped nitride film are removed and a phase change film is deposited to surround the pillar-shaped nitride film and connect with the lower electrodes. The phase change film is etched on upper portions of the pillar-shaped nitride film, and a reset gate insulating film is formed surrounding the phase change film and forming a reset gate having a side wall shape and remaining on the upper portions of the pillar-shaped nitride film.