Patent ID: 7129155

Claim:
A process for producing a plurality of gate stacks which are approximately the same height and equidistant on a semiconductor substrate, comprising the steps of: (a) providing a gate dielectric on the semiconductor substrate; (b) applying and patterning at least a first layer and a second layer, above the first layer, to the gate dielectric in order to produce the gate stacks; (c) carrying out an oblique implantation of an oxidation-inhibiting implantation species into two opposite, uncovered side faces of the second layer of the gate stacks, with respectively adjacent gate stacks serving to shadow the uncovered side faces of the first layer of the gate stacks; and (d) carrying out oxidation to simultaneously form a first oxide layer on uncovered side faces of the first layer of the gate stacks and a second oxide layer on uncovered side faces of the second layer of the gate stacks, the thickness of the first oxide layer being greater than the thickness of the second oxide layer.