# US 12,010,843 B2 · Non-volatile storage device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,010,843 B2 - Document ID: US12010843B2 - Status: Granted - Kind: B2 - Application number: 17/205,329 - Filed: 2021-03-18 - Published: 2021-07-08 - Granted: 2024-06-11 - Earliest claimed: 2013-09-10 - Assignees: Kioxia Corporation - Applicants: Kioxia Corporation - Inventors: Masaaki Higuchi; Masaru Kito; Masao Shingu - Web page: https://patentgrep.com/patent/US12010843B2 ## CPC - H10B 43/27: the channels comprising vertical portions, e.g. U-shaped channels - H10B 43/35: with cell select transistors, e.g. NAND - H10D 30/0413: {of FETs having charge-trapping gate insulators, e.g. MNOS transistors} - H10D 30/693: {Vertical IGFETs having charge trapping gate insulators} - H10B: ELECTRONIC MEMORY DEVICES - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES ## Abstract According to an embodiment, a non-volatile storage device includes a first layer, a second layer formed on the first layer, a stacked body including a plurality of conductive films stacked on the second layer, and a semiconductor pillar which penetrates the stacked body and the second layer and reaches the first layer. The semiconductor pillar includes a semiconductor film formed along an extending direction of the semiconductor pillar, and a memory film which covers a periphery of the semiconductor film. The memory film includes a first portion formed between the stacked body and the semiconductor film and a second portion formed between the second layer and the semiconductor film. An outer periphery of the second portion in a plane perpendicular to the extending direction is wider than an outer periphery of the first portion on a second layer side of the stacked body. ## Claims ### Claim 1 A non-volatile storage device, comprising: a first layer; a second layer over the first layer; a stacked body including a plurality of conductive films stacked above the second layer; and a semiconductor pillar which penetrates the stacked body and the second layer and reaches the first layer, wherein the semiconductor pillar includes a semiconductor film provided along an extending direction of the semiconductor pillar and a memory film provided on a periphery of the semiconductor film, the memory film includes a first portion between the stacked body and the semiconductor film in a direction perpendicular to the extending direction and a second portion between the second layer and the semiconductor film in the direction perpendicular to the extending direction, and a thickness of the second portion of the memory film in the semiconductor pillar is greater than a thickness of the first portion of the memory film in the semiconductor pillar. ### Claim 2 (depends on 1) The non-volatile storage device according to claim 1, wherein the semiconductor film and the memory film contact the first layer. ### Claim 3 (depends on 1) The non-volatile storage device according to claim 1, further comprising: a gate located between the first portion and the second portion along the extending direction. ### Claim 4 (depends on 1) The non-volatile storage device according to claim 1, wherein the memory film includes a first silicon nitride film, a first silicon oxide film, a second silicon nitride film, and a second silicon oxide film. ### Claim 5 (depends on 1) The non-volatile storage device according to claim 1, wherein the first layer comprises a polysilicon layer doped with a dopant. ### Claim 6 (depends on 1) The non-volatile storage device according to claim 1, wherein the conductive films comprise polycrystalline silicon. ### Claim 7 (depends on 1) The non-volatile storage device according to claim 1, wherein the plurality of conductive films are stacked along with a plurality of silicon oxide films in the stacked body, the silicon oxide films being between otherwise adjacent conductive films in the stacked body. ### Claim 8 (depends on 7) The non-volatile storage device according to claim 7, wherein the first portion opposes the silicon oxide films. ### Claim 9 A non-volatile storage device, comprising: a first layer including a source line; a second layer over the first layer; a stacked body including a plurality of conductive films stacked over the second layer; and a semiconductor pillar which penetrates the stacked body and the second layer and contacts the source line, wherein the semiconductor pillar includes a semiconductor film provided along an extending direction of the semiconductor pillar and a memory film provided on a periphery of the semiconductor film, the memory film includes a first portion between the stacked body and the semiconductor film and a second portion between the second layer and the semiconductor film, and an outer periphery of the second portion, in a direction perpendicular to the extending direction, has a portion that is wider than an outer periphery of the first portion on a second layer side of the stacked body. ### Claim 10 (depends on 9) The non-volatile storage device according to claim 9, wherein the plurality of conductive films are stacked along with a plurality of silicon oxide films in the stacked body, the silicon oxide films being between otherwise adjacent conductive films in the stacked body. ### Claim 11 (depends on 9) The non-volatile storage device according to claim 9, further comprising: a gate located between the first portion and the second portion along the extending direction. ### Claim 12 (depends on 9) The non-volatile storage device according to claim 9, wherein the memory film includes a first silicon nitride film which is in contact with the stacked body and the second layer. ### Claim 13 (depends on 12) The non-volatile storage device according to claim 12, wherein the memory film includes a first silicon oxide film, a second silicon nitride film, and a second silicon oxide film. ### Claim 14 A non-volatile storage device comprising: a first layer disposed in a first plane; a second layer over the first layer; a first selector gate over the second layer, a stacked body including a plurality of conductive films separated by an insulating film and stacked over the first selector gate; a second selector gate over the stacked body, and a semiconductor pillar which penetrates the second selector gate, the stacked body, the first selector gate and the second layer and extends to the first layer, wherein the first layer includes a source line that contacts the semiconductor pillar, the semiconductor pillar extends in a first direction perpendicular to the first plane and includes a semiconductor film parallel to the first direction and a memory film on a periphery of the semiconductor film, the memory film includes a first portion between the stacked body and the semiconductor film and a second portion between the second layer and the semiconductor film, and the second portion is under the first selector gate. ### Claim 15 (depends on 14) The non-volatile storage device according to claim 14, wherein the memory film includes a first silicon nitride film in contact with the stacked body and the second layer. ### Claim 16 (depends on 14) The non-volatile storage device according to claim 14, wherein the first selector gate is located between the first portion and the second portion along the first direction. ### Claim 17 (depends on 14) The non-volatile storage device according to claim 14, wherein an outer periphery of the second portion, in a direction perpendicular to the first direction, is wider than an outer periphery of the first portion on a second layer side of the stacked body. ### Claim 18 (depends on 14) The non-volatile storage device according to claim 14, wherein a center of the first portion in a direction perpendicular to the first direction is located directly above a center of the second portion in the direction perpendicular to the first direction. ### Claim 19 (depends on 14) The non-volatile storage device according to claim 14, wherein the memory film includes a first silicon nitride film, a first silicon oxide film, a second silicon nitride film, and a second silicon oxide film, the first silicon nitride film being in contact with the stacked body and the second layer. ### Claim 20 (depends on 19) The non-volatile storage device according to claim 19, wherein the first silicon oxide film, the second silicon nitride film, and the second silicon oxide film are stacked sequentially along the direction from the first silicon nitride film towards the semiconductor film.