Patent ID: 6656801
Filing Date: 2003-12-02
Classification: H01L

Abstract:
A process for manufacturing a memory array formed of a large number of stacked cells, comprising:making a plurality of MOS transistors in respective active areas of a substrate made of semiconductor material, said step of making a plurality of MOS transistors comprising the steps of making, for each one of said MOS transistors, a first and a second conductive region in the substrate and a control electrode; forming an insulating layer above the substrate; for each MOS transistor, forming first and second electrical contacts extending through the insulating layer, the first and second electrical contacts being positioned directly above and contacting the first and second conduction regions, respectively; making a plurality of capacitors, a corresponding one for each one of said MOS transistors, above said active regions, said step of making a plurality of capacitors comprising the steps of making, for each one of said capacitors, a first plate directly above and in contact with the first electrical contact of the corresponding MOS transistor, a dielectric material region above said first plate, and a second plate above said dielectric material region, each of the cells including one of the MOS transistors and a corresponding one of the capacitors; making a plurality of bit lines connected to said second conductive regions of said MOS transistors by the second contacts; and making a plurality of word lines and a plurality of plate lines running parallel to each other and perpendicular to said bit lines, each word line being connected to respective control electrodes of said MOS transistors and each plate line being connected to respective second plates; wherein said step of making a dielectric material region comprises the step of making a same dielectric region shared by two adjacent cells in a direction parallel to said bit lines, the second plates of the capacitors of the two adjacent cells being spaced apart from each other.