Patent ID: 6878965
Filing Date: 2005-04-12
Classification: H01L

Abstract:
1. A test structure for determining an extent of a doping region of outer capacitor electrodes of trench capacitors in a memory cell array, the trench capacitors of the memory cell array being arranged in matrix form and each having a trench with an inner capacitor electrode isolated by a dielectric layer from an outer capacitor electrode, formed as a doping region, around a lower trench region, the test structure comprising: first and second contact-connectible capacitor plates; a first row of trench capacitors formed with outer capacitor electrodes electrically connected to said first capacitor plate, and a second row of trench capacitors disposed parallel to said first row of trench capacitors and formed with outer capacitor electrodes electrically connected to said second capacitor plate; in a plan view, at least one trench capacitor of said first row of trench capacitors and at least one trench capacitor of said second row of trench capacitors each having a lengthened basic area on a side facing the respective other row of said trench capacitors and overlapping the respectively other lengthened basic areas.