Patent ID: 8158514

Claim:
A method for the production of vertical electrical contact connections in semiconductor wafers for the fabrication of semiconductor devices, including contacts on the front side of the wafer through the semiconductor wafer, to the rear side of the wafer, comprising: application of a protective varnish on the front side of the wafer; texturing of the protective varnish on the front side of the wafer so that source contacts facing the front side of the wafer become exposed; laser drilling of through holes at the exposed contact connection sites from the rear side of the wafer through a semiconductor substrate, active layers formed on the semiconductor substrate and the source contacts facing the front side of the wafer such that the through holes travel completely through from the rear side to the front side of the wafer, the active layers and the source contacts facing the front side; cleaning of the wafer; application of a plating base on the rear side of the wafer and in the laser-drilled through holes; application of gold by electroplating to a metallized rear side of the wafer and to the through holes; stripping of the protective varnish; and application of a dewetting layer in the region of the entry openings of the through holes on the rear side of the wafer, wherein said method is carried out one after the other in the order recited above.