Patent ID: 7569459

Claim:
A method of fabricating a nonvolatile programmable resistor memory cell, the method comprising steps of: forming a first electrode; forming a second electrode facing the first electrode, wherein at least one electrode is transparent to oxygen ions; and providing a resistance structure comprising: a high-mobility oxygen ion conductor region comprising one selected from a group consisting of: fluorite-type with extrinsic oxide-ion vacancies, doped ceria, perovskites with intrinsic or extrinsic vacancies, Aurivillius-type oxides, and pyrochlores; and wherein the high-mobility oxygen ion conductor region is characterized by a partial occupancy of energetically equivalent oxide-ion lattice sites, the oxygen ionic distribution of the region being modifiable by external electric field, and wherein the high-mobility oxygen ion conductor region comprises Ce 0.9 Gd 0.1 O 1.95 or Bi 4 V 1.8 Cu 0.2 O 10.7 ; and a transition-metal oxide region comprising at least one selected from a group consisting of: titanium, vanadium, chromium, manganese, nickel, zirconium, niobium, hafnium and tantalum, wherein the transition-metal oxide region exhibits a filling-controlled metal-insulator transition.