Patent ID: 8227340
Filing Date: 2012-07-24
Classification: H01L

Abstract:
1. A method for producing an electrically conductive connection between a first surface of a semiconductor substrate and a second surface of the semiconductor substrate, the method comprising: producing a hole from the first surface of the semiconductor substrate into the semiconductor substrate; forming an electrically conductive layer on the first surface of the semiconductor substrate, a side wall surface of the hole and a bottom surface of the hole, wherein the electrically conductive layer comprises tungsten; removing the electrically conductive layer from the first surface of the semiconductor substrate, wherein the electrically conductive layer remains, at least with reduced thickness, at the bottom surface and the side wall surface of the hole, wherein the removing of the electrically conductive layer from the first surface of the semiconductor substrate comprises performing a reactive ion etch process that is adjusted so that the electrically conductive layer remains at the bottom surface and the side wall surface of the hole; filling the hole with copper after removing the conductive layer from the first surface of the semiconductor substrate, wherein the copper is separated from the bottom surface and the side wall surface of the hole by at least the electrically conductive layer; and thinning the semiconductor substrate starting from a surface, which is an opposite surface of the first surface of the semiconductor substrate, to obtain the second surface of the semiconductor substrate with the electrically conductive layer being uncovered at the second surface of the semiconductor substrate.