Patent ID: 8455355

Claim:
A method for the production of vertical through-plated holes for the fabrication of contacts extending from a front side of a semiconductor wafer, through the semiconductor wafer to a rear side of the wafer, comprising: Coating the rear side of the wafer with indium tin oxide (ITO); Laser drilling of partial pocket holes at the contacting sites from the rear side of the wafer into the semiconductor substrate such that an active layer stack arranged on the front side of the wafer is not reached; Cleaning of the wafer; Material-selective plasma etching of the partial pocket holes in the semiconductor substrate through to the active layer stack of the wafer; Material-selective plasma etching of the active layer stack of the wafer until contacts that are to be connected to the rear side are reached and entire pocket holes are formed; Removing the indium tin oxide coating from the rear side of the wafer; Applying a plating base to the rear side of the wafer and to the inside of the entire pocket holes; and Applying gold by plating the metallized rear side of the wafer and the entire pocket holes.