Patent ID: 8357964

Claim:
A three-dimensional dynamic random access memory with an ancillary electrode structure, comprising: a substrate; at least one bit line which is formed on the substrate by doping and diffusing a doping element and includes a growth zone and a separation zone; at least one pillar element which is formed on the growth zone of the bit line and includes a top wall remote from the bit line and a side wall between the bit line and the top wall, the side wall being perpendicular to the bit line, the top wall including an opening; a first dielectric layer formed on the separation zone of the bit line and a surface of the pillar element; at least one ancillary electrode formed on a surface of the first dielectric layer corresponding to the separation zone and adjacent to the pillar element; a second dielectric layer connecting to the first dielectric layer and encasing the ancillary electrode; at least one character line formed on the surface of the first dielectric layer remote from the side wall and parallel with a surface of the substrate and perpendicular to the bit line, and spaced from the ancillary electrode via the second dielectric layer; and at least one capacitor formed on the top wall of the pillar element and connected to the pillar element through the opening.