Patent ID: 11776609

Abstract:
In a dynamic flash memory cell including: a HfO2 layer and a TiN layer surrounding a lower portion of a Si pillar standing on a P-layer substrate; a HfO2 layer surrounding an upper portion of the Si pillar; a TiN layer; and N+ layers connected to a bottom portion and a top portion of the Si pillar, and an SGT transistor including: a SiO2 layer surrounding a lower portion of a Si pillar standing on the same P-layer substrate; a HfO2 layer surrounding an upper portion of the Si pillar; a TiN layer; and N+ layers sandwiching the HfO2 layer in a perpendicular direction and connected to a top portion and a middle portion of the Si pillar, bottom positions of the Si pillar and the Si pillar are at the same position A. A bottom portion of an upper transistor portion of the dynamic flash memory cell composed of the HfO2 layer and the TiN layer in an upper portion of the Si pillar, and a bottom portion of an SGT transistor portion composed of the HfO2 layer and the TiN layer in an upper portion of the Si pillar are at the same position B.