Patent ID: 9001523
Filing Date: 2015-04-07
Classification: H01L

Abstract:
1. A method for patterning a layer stack, the method comprising: providing a ceramic layer, which comprises at least one plated-through hole; applying an electrically conductive layer over the ceramic layer, such that the electrically conductive layer is electrically coupled to the at least one plated-through hole; electrolessly applying a copper layer to the electrically conductive layer, wherein the electrolessly applying the copper layer applies the copper layer laminar; applying a photoresist to the electrically conductive layer after the electrolessly applying the copper layer; exposing a region of the photoresist in which the electrically conductive layer is intended to be removed; removing a non-exposed region of the photoresist, thereby uncovering the electrically conductive layer in the non-exposed region; electrodepositing a further layer onto the electrically conductive layer in the non-exposed region and in a region of the at least one plated-through hole, wherein the further layer comprises nickel; removing the electrically conductive layer outside the region of the at least one plated-through hole; and applying a further conductive layer on the further layer, wherein the further conductive layer at least covers the further layer and the electrically conductive layer and also covers lateral flanks of the further layer and the electrically conductive layer.