Patent ID: 7361549

Claim:
A method for fabricating a memory device which includes memory cells and devices for causing the memory cells to respond, comprising the steps of: a) forming a microstructured driving unit for driving memory cells, by providing a substrate having an insulation layer deposited thereon, in which insulation layer select transistor units, each with diffusion barrier layers applied to them, are embedded; b) depositing a stop layer formed from an aluminium oxide material on the microstructured driving unit; c) depositing a shaping layer on the stop layer; d) patterning the deposited shaping layer, in such a manner that vertical trench structures are formed perpendicular to the surface of the driving unit; e) depositing a seed layer on the patterned shaping layer, in such a manner that the seed layer covers side walls and a base of the trench structures, the seed layer consisting of a titanium oxide material; f) filling the trench structures with a crystallization agent; g) crystallizing the crystallization agent, in such a manner that grain boundaries of a crystallization filling which forms are oriented perpendicular to the side walls of the trench structures; h) etching the crystallization filling at the top side of the layer stack formed in steps a) to g), in such a manner that the surface of the shaping layer is uncovered; i) depositing a covering layer on the etched crystallization filling and the uncovered regions of the shaping layer; j) chemical-mechanical polishing the covering layer, in such a manner that a region comprising a part of the covering layer is retained on the surface of the crystallization filling; k) removing the shaping layer and the side regions of the seed layer, in such a manner that electrode holes are formed; and l) depositing an electrode material in the electrode holes.