Patent ID: 8512539

Claim:
A method of fabricating a mould, wherein the method comprises the following steps of: (a) providing a substrate that has an electrically conductive top layer and an electrically conductive bottom layer, wherein the top layer and the bottom layer are each made of an electrically conductive, silicon based material, and the top layer and the bottom layer are secured to each other by an electrically insulating, intermediate layer; (b) etching at least one pattern in the top layer to reveal the intermediate layer so as to form at least one or more first cavity in the mould, wherein each first cavity has a bottom formed by the intermediate layer and at least one vertical wall formed in the top layer; (c) coating a top part of the substrate with an electrically insulating coating, wherein the top part includes the bottom formed by the intermediate layer and vertical walls of each first cavity; and (d) directionally etching the coating and the intermediate layer so that the electrically insulating coating remains exclusively at each vertical wall formed in the top layer.