Patent ID: 7335936

Claim:
A memory cell, comprising: a cylindrical trench capacitor formed in a lower portion of a trench hole, the cylindrical trench capacitor comprising: an inner electrode; an outer electrode; and a dielectric layer disposed between the inner electrode and the outer electrode; and a vertical selection transistor located above the cylindrical trench capacitor and comprising a first source-drain electrode, a second source-drain electrode and an interposed channel area formed between the source-drain electrodes, the first source-drain electrode being connected to the inner electrode of the trench capacitor, and the second source-drain electrode being connected to a bit line; wherein a conductive channel is formed in the channel area as a function of a potential of a word line in order to connect the inner electrode of the trench capacitor to the bit line; wherein the channel area at least partially surrounds the trench hole without completely surrounding the trench hole; wherein the trench hole is defined at least in part by two side walls arranged at an angle to one another; and wherein the channel area at least partially surrounds the two side walls of the trench hole.