Dielectric mesh isolated phase change structure for phase change memory
First Claim
1. A method for manufacturing a memory device, the method comprising:
- forming a first electrode and a second electrode;
forming a body of phase change memory material between the first and second electrodes, the phase change memory material comprising a chalcogenide material doped with a dielectric material; and
creating a first, active region and a second region within the body of phase change memory material, the creating step comprising;
forming within the first region a first concentration of the phase change material and a second concentration of the dielectric material; and
forming within the first, active region;
a plurality phase change material domains having a first concentration of the phase change material; and
a mesh of the dielectric material at least partially separating the plurality of phase change material domains; and
forming the phase change memory material within the second region in a polycrystalline state with grains without a mesh of the dielectric material surrounding the grains.
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Abstract
A method for manufacturing a memory device, and a resulting device, is described using silicon oxide doped chalcogenide material. A first electrode having a contact surface; a body of phase change memory material in a polycrystalline state including a portion in contact with the contact surface of the first electrode, and a second electrode in contact with the body of phase change material are formed. The process includes melting and cooling the phase change memory material one or more times within an active region in the body of phase change material without disturbing the polycrystalline state outside the active region. A mesh of silicon oxide in the active region with at least one domain of chalcogenide material results. Also, the grain size of the phase change material in the polycrystalline state outside the active region is small, resulting in a more uniform structure.
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Citations
21 Claims
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1. A method for manufacturing a memory device, the method comprising:
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forming a first electrode and a second electrode; forming a body of phase change memory material between the first and second electrodes, the phase change memory material comprising a chalcogenide material doped with a dielectric material; and creating a first, active region and a second region within the body of phase change memory material, the creating step comprising; forming within the first region a first concentration of the phase change material and a second concentration of the dielectric material; and forming within the first, active region; a plurality phase change material domains having a first concentration of the phase change material; and a mesh of the dielectric material at least partially separating the plurality of phase change material domains; and forming the phase change memory material within the second region in a polycrystalline state with grains without a mesh of the dielectric material surrounding the grains. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A phase change memory device, comprising:
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a first electrode and a second electrode; a body of phase change memory material between the first and second electrodes, the phase change memory material comprising a chalcogenide material doped with a dielectric material; and the body of phase change material having a first, active region and a second region; the first, active region comprising; a plurality of phase change material domains having a first concentration of phase change material; and a mesh of the dielectric material at least partially separating the plurality of phase change material domains; and the second region being in a polycrystalline state with grains without a mesh of the dielectric material surrounding the grains, the second regain having a second concentration of phase change material, the second concentration being less than the first concentration. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification