Patent ID: 7304342
Filing Date: 2007-12-04
Classification: H01L

Abstract:
1. A semiconductor memory cell comprising: a storage capacitor for storing electrical charges; and a selection transistor connected to the storage capacitor and serving for selection of the semiconductor memory cell, the selection transistor having a source region and a drain region defining a channel in a semiconductor substrate, and a gate dielectric and a control electrode thereon formed at a surface of the channel; and a first trench, having an insulation layer and a first filling layer, between the storage capacitor and the selection transistor, wherein the storage capacitor is formed in a second trench of the semiconductor substrate, and a capacitor dielectric and a second filling layer are disposed at a surface of the second trench to form a capacitor counterelectrode, and the second filling layer has a projection that extends outside the second trench as far as the source or drain region and is electrically connected thereto.