Patent ID: 6998697

Claim:
A resistance variable device comprising: a substrate having a first electrode formed thereover; a resistance variable chalcogenide comprising material having metal ions diffused therein received operatively adjacent the first electrode, the chalcogenide material comprising A x B y , where “B” is selected from the group consisting of S, Se and Te and mixtures thereof, and where “A” comprises at least one element which is selected from Group 13, Group 14, Group 15, or Group 17 of the periodic table; a second electrode received operatively adjacent the resistance variable chalcogenide comprising material; and the second electrode and resistance variable chalcogenide comprising material operatively connecting at an interface, the chalcogenide comprising material having a first region which is displaced from the interface at least by a chalcogenide material interface region having a higher content of “A” than the first region, and no metal chalcogenide agglomerations at the interface.