Patent ID: 8658499

Claim:
A method of making a device, comprising: forming a stack of alternating layers of a first material and a second material over a substrate, wherein the first material comprises a conductive or semiconductor control gate material and wherein the second material comprises a first sacrificial material; etching the stack to form an opening in the stack; selectively removing the second material through the opening to form recesses; forming a blocking dielectric layer in the recesses to partially fill the recesses, the blocking dielectric layer located on surfaces of the control gate material; forming a charge storage material layer over the blocking dielectric such that the charge storage material layer partially fills the recesses and is located over the blocking dielectric layer; filling the recesses with a second sacrificial material; at least partially filling the opening with a third sacrificial material, such that the third sacrificial material contacts the second sacrificial material; reacting the second and third sacrificial materials to form a sacrificial compound material comprising the second and third sacrificial materials where the second and third sacrificial material layers contact each other; selectively removing the sacrificial compound material and any second sacrificial material remaining in the recesses while leaving unreacted portions of the third sacrificial material located adjacent to vertical edges of the control gate material; selectively removing portions of the charge storage material layer located in the recesses that are not covered by the unreacted portion of third sacrificial material located over the vertical edges of the control gate material, thereby forming vertically separated charge storage segments over the vertical edges of the control gate material.