Patent ID: 8895402
Filing Date: 2014-11-25
Classification: H01L

Abstract:
1. A method of forming a device comprising: providing a substrate prepared with a lower electrode level with at least one bottom electrode; forming fin stack layers on the lower electrode level, wherein the fin stack layers comprise a secondary fin body layer and a main fin body layer formed over and contacts the secondary fin body layer and the secondary fin body layer contacts the at lest one bottom electrode; forming spacers on top of and directly contacting a top surface of the main fin body layer, wherein the spacers have a width which is less than a lithographic resolution; patterning at least the main fin body layer using the spacers as a mask to form individual fin stacks; removing the spacers after patterning at least the main fin body layer; forming an interlevel dielectric (ILD) layer on the substrate, filling spaces around the fin stacks; and forming an upper electrode level on the ILD layer after removing the spacers, the upper electrode level having at least one top electrode in contact with the fin stacks, the electrodes and fin stacks form one or more fin-type memory cells.