Patent ID: 6110777
Filing Date: 2000-08-29
Classification: H01L

Abstract:
A method of monitoring a process of manufacturing a semiconductor wafer, the method comprising:forming an area of hemispherical grain polysilicon on a front side of the wafer;forming a dielectric over the hemispherical grain polysilicon;forming an area of hemispherical grain polysilicon on a back side of the wafer;forming a dielectric over the hemispherical grain polysilicon on the back side of the wafer;supporting the back side dielectric of the semiconductor wafer on a conductive chuck of a probe of the type having a liquid conductor;coupling a first electrode of a capacitance-voltage meter to the liquid conductor of the probe, coupling a second electrode of the capacitance-voltage meter to the chuck;causing the liquid conductor to contact the dielectric on the front side of the wafer;performing a capacitance-voltage measurement with the probe, using the capacitance-voltage meter and a low frequency measurement method, to determine capacitance-voltage characteristics at the area of hemispherical grain polysilicon; anddetermining surface area of the area of hemispherical grain polysilicon based on the capacitance-voltage characteristics.