Patents by Inventor Rajasekhar Venigalla
Rajasekhar Venigalla has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240347107Abstract: Methods, systems, and devices supporting a socket design for a memory device are described. A die may include one or more memory arrays, which each may include any number of word lines and any number of bit lines. The word lines and the bit lines may be oriented in different directions, and memory cells may be located at the intersections of word lines and bit lines. Sockets may couple the word lines and bit lines to associated drivers, and the sockets may be located such that memory cells farther from a corresponding word line socket are nearer a corresponding bit line socket, and vice versa. For example, sockets may be disposed in rows or regions that are parallel to one another, and which may be non-orthogonal to the corresponding word lines and bit lines.Type: ApplicationFiled: March 26, 2024Publication date: October 17, 2024Inventors: Amitava Majumdar, Radhakrishna Kotti, Rajasekhar Venigalla
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Publication number: 20240332179Abstract: A method for making a vertical contact through levels of a memory device. A first liner is formed in an opening, and a second liner is formed over the first liner. The first liner is selectively removed from under the second liner to expose a first portion of the opening, such that the first liner remains intact over a second portion of the opening. The second liner is then removed, leaving the first liner overlying the second portion of the opening. A first portion of each of the layers of nitride materials in the first portion of the opening uncovered by the first liner is removed, the second portion of the first liner is removed, and a second portion of each of the layers of the nitride materials is removed in the second portion of the opening, wherein the second portion is less than the first portion.Type: ApplicationFiled: March 25, 2024Publication date: October 3, 2024Inventors: Rajasekhar Venigalla, Justin David Shepherdson, Hiroaki Iuchi, Vladimir Samara
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Patent number: 12074165Abstract: A method of forming a power rail to semiconductor devices comprising removing a portion of the gate structure forming a gate cut trench separating a first active region of fin structures from a second active region of fin structures. A conformal etch stop layer is formed in the gate cut trench. A fill material is formed on the conformal etch stop layer filling at least a portion of the gate cut trench. The fill material has a composition that is etched selectively to the conformal etch stop layer. A power rail is formed in the gate cut trench. The conformal etch stop layer obstructs lateral etching during forming the power rail to substantially eliminate power rail to gate structure shorting.Type: GrantFiled: August 7, 2023Date of Patent: August 27, 2024Assignee: Tessera LLCInventors: Marc A. Bergendahl, Andrew M. Greene, Rajasekhar Venigalla
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Publication number: 20240224825Abstract: Methods, systems, and devices for a low resistance crosspoint architecture are described. A manufacturing system may deposit a thermal barrier material, followed by a first layer of a first conductive material, on a layered assembly including a patterned layer of electrode materials and a patterned layer of a memory material. The manufacturing system may etch a first area of the layered assembly to form a gap in the first layer of the first conductive material, the thermal barrier material, the patterned layer of the memory material, and the patterned layer of electrode materials. The manufacturing system may deposit a second conductive material to form a conductive via in the gap, where the conductive via extends to a height within the layered assembly that is above the thermal barrier material.Type: ApplicationFiled: January 10, 2024Publication date: July 4, 2024Inventors: Rajasekhar Venigalla, Patrick M. Flynn, Josiah Jebaraj Johnley Muthuraj, Efe Sinan Ege, Kevin Lee Baker, Tao Nguyen, Davis Weymann
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Publication number: 20240222373Abstract: A method of forming a power rail to semiconductor devices comprising removing a portion of the gate structure forming a gate cut trench separating a first active region of fin structures from a second active region of fin structures. A conformal etch stop layer is formed in the gate cut trench. A fill material is formed on the conformal etch stop layer filling at least a portion of the gate cut trench. The fill material has a composition that is etched selectively to the conformal etch stop layer. A power rail is formed in the gate cut trench. The conformal etch stop layer obstructs lateral etching during forming the power rail to substantially eliminate power rail to gate structure shorting.Type: ApplicationFiled: August 7, 2023Publication date: July 4, 2024Inventors: Marc A. Bergendahl, Andrew M. Greene, Rajasekhar Venigalla
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Patent number: 11961556Abstract: Methods, systems, and devices supporting a socket design for a memory device are described. A die may include one or more memory arrays, which each may include any number of word lines and any number of bit lines. The word lines and the bit lines may be oriented in different directions, and memory cells may be located at the intersections of word lines and bit lines. Sockets may couple the word lines and bit lines to associated drivers, and the sockets may be located such that memory cells farther from a corresponding word line socket are nearer a corresponding bit line socket, and vice versa. For example, sockets may be disposed in rows or regions that are parallel to one another, and which may be non-orthogonal to the corresponding word lines and bit lines.Type: GrantFiled: January 4, 2022Date of Patent: April 16, 2024Assignee: Micron Technology, Inc.Inventors: Amitava Majumdar, Radhakrishna Kotti, Rajasekhar Venigalla
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Patent number: 11882774Abstract: Methods, systems, and devices for a low resistance crosspoint architecture are described. A manufacturing system may deposit a thermal barrier material, followed by a first layer of a first conductive material, on a layered assembly including a patterned layer of electrode materials and a patterned layer of a memory material. The manufacturing system may etch a first area of the layered assembly to form a gap in the first layer of the first conductive material, the thermal barrier material, the patterned layer of the memory material, and the patterned layer of electrode materials. The manufacturing system may deposit a second conductive material to form a conductive via in the gap, where the conductive via extends to a height within the layered assembly that is above the thermal barrier material.Type: GrantFiled: September 7, 2021Date of Patent: January 23, 2024Assignee: Micron Technology, Inc.Inventors: Rajasekhar Venigalla, Patrick M. Flynn, Josiah Jebaraj Johnley Muthuraj, Efe Sinan Ege, Kevin Lee Baker, Tao Nguyen, Davis Weymann
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Publication number: 20230395150Abstract: A microelectronic device includes a stack structure including blocks separated from one another by dielectric slot structures and each including a vertically alternating sequence of conductive structures and insulative structures arranged in tiers. The blocks including a stadium structure including opposing staircase structures each having steps comprising edges of the tiers. The blocks further include a filled trench vertically overlying and within horizontal boundaries of the stadium structure. The filled trench includes dielectric liner structures and additional dielectric liner structures having a different material composition than that of the dielectric liner structures and alternating with the dielectric liner structures. The filled trench also includes dielectric fill material overlying an alternating sequence of the dielectric liner structures and additional dielectric liner structures.Type: ApplicationFiled: June 1, 2023Publication date: December 7, 2023Inventors: Rui Zhang, Shuangqiang Luo, Mohad Baboli, Rajasekhar Venigalla
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Publication number: 20230343393Abstract: A method used in forming a memory array comprising strings of memory cells comprises forming a stack comprising vertically-alternating first tiers and second tiers directly above a conductor tier that comprises silicon-containing material. The stack comprises laterally-spaced memory-block regions and a through-array-via (TAV) region. The stack comprises channel-material strings that extend through the first tiers and the second tiers in the memory-block regions. The stack comprises TAV openings in the TAV region that extend to the silicon-containing material of the conductor tier. A metal halide is reacted with the silicon of the silicon-containing material to deposit the metal of the metal halide in the conductor tier. After depositing the metal, conductive material is formed in the TAV openings directly against the deposited metal and therefrom a TAV is formed in individual of the TAV openings that comprises the conductive material and the deposited metal. Structure embodiments are disclosed.Type: ApplicationFiled: April 22, 2022Publication date: October 26, 2023Applicant: Micron Technology, Inc.Inventors: Jordan D. Greenlee, Rajasekhar Venigalla, Tom George
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Patent number: 11778837Abstract: A memory system may include separate amounts or types of resistive material that may be deposited over memory cells and conductive vias using separate resistive layers in the access lines. A first resistive material layer may be deposited over the memory cells prior to performing an array termination etch used to deposit the conductive via. The array termination etch may remove the first resistive material over the portion of the array used to deposit the conductive via. A second resistive material layer may be deposited after the etch has occurred and the conductive via has been formed. The second resistive material layer may be deposited over the conductive via.Type: GrantFiled: June 22, 2022Date of Patent: October 3, 2023Assignee: Micron Technology, Inc.Inventors: Lei Wei, Pengyuan Zheng, Kevin Lee Baker, Efe Sinan Ege, Adam Thomas Barton, Rajasekhar Venigalla
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Patent number: 11776957Abstract: A method of forming a power rail to semiconductor devices comprising removing a portion of the gate structure forming a gate cut trench separating a first active region of fin structures from a second active region of fin structures. A conformal etch stop layer is formed in the gate cut trench. A fill material is formed on the conformal etch stop layer filling at least a portion of the gate cut trench. The fill material has a composition that is etched selectively to the conformal etch stop layer. A power rail is formed in the gate cut trench. The conformal etch stop layer obstructs lateral etching during forming the power rail to substantially eliminate power rail to gate structure shorting.Type: GrantFiled: December 7, 2022Date of Patent: October 3, 2023Assignee: TESSERA LLCInventors: Marc A. Bergendahl, Andrew M. Greene, Rajasekhar Venigalla
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Publication number: 20230282641Abstract: A method of forming a power rail to semiconductor devices comprising removing a portion of the gate structure forming a gate cut trench separating a first active region of fin structures from a second active region of fin structures. A conformal etch stop layer is formed in the gate cut trench. A fill material is formed on the conformal etch stop layer filling at least a portion of the gate cut trench. The fill material has a composition that is etched selectively to the conformal etch stop layer. A power rail is formed in the gate cut trench. The conformal etch stop layer obstructs lateral etching during forming the power rail to substantially eliminate power rail to gate structure shorting.Type: ApplicationFiled: December 7, 2022Publication date: September 7, 2023Inventors: Marc A. Bergendahl, Andrew M. Greene, Rajasekhar Venigalla
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Publication number: 20230207469Abstract: A memory array comprising strings of memory cells comprise laterally-spaced memory blocks individually comprising a vertical stack comprising alternating insulative tiers and conductive tiers directly above a conductor tier. Strings of memory cells comprise channel-material strings that extend through the insulative tiers and the conductive tiers. The channel-material strings directly electrically couple with conductor material of the conductor tier. A through-array-via (TAV) region comprises TAV constructions that individually extend through the insulative tiers and the conductive tiers into the conductor tier. Individual of the TAV constructions comprise an upper portion directly above and joined with a lower portion. The individual TAV constructions comprise at least one external jog surface in a vertical cross-section where the upper and lower portions join. Other embodiments, including method, are disclosed.Type: ApplicationFiled: January 24, 2022Publication date: June 29, 2023Applicant: Micron Technology, Inc.Inventors: Damir Fazil, Indra V. Chary, Nancy M. Lomeli, Rajasekhar Venigalla
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Publication number: 20230170024Abstract: A memory array comprising strings of memory cells comprises laterally-spaced memory blocks individually comprising a vertical stack comprising alternating insulative tiers and conductive tiers directly above a conductor tier. Strings of memory cells comprise channel-material strings that extend through the insulative tiers and the conductive tiers. The channel-material strings directly electrically couple with conductor material of the conductor tier. A through-array-via (TAV) region comprises TAVs that individually extend through the insulative tiers and the conductive tiers into the conductor tier. Individual of the TAVs comprise an upper portion directly above and joined with a lower portion. The individual TAVs comprise at least one external jog surface in a vertical cross-section where the upper and lower portions join. The lower portion is wider in the vertical cross-section than the upper portion where the upper and lower portions join. Other embodiments, including method, are disclosed.Type: ApplicationFiled: November 30, 2021Publication date: June 1, 2023Applicant: Micron Technology, Inc.Inventors: Nancy M. Lomeli, Rajasekhar Venigalla
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Patent number: 11552077Abstract: A method of forming a power rail to semiconductor devices comprising removing a portion of the gate structure forming a gate cut trench separating a first active region of fin structures from a second active region of fin structures. A conformal etch stop layer is formed in the gate cut trench. A fill material is formed on the conformal etch stop layer filling at least a portion of the gate cut trench. The fill material has a composition that is etched selectively to the conformal etch stop layer. A power rail is formed in the gate cut trench. The conformal etch stop layer obstructs lateral etching during forming the power rail to substantially eliminate power rail to gate structure shorting.Type: GrantFiled: April 2, 2021Date of Patent: January 10, 2023Assignee: TESSERA LLCInventors: Marc A. Bergendahl, Andrew M. Greene, Rajasekhar Venigalla
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Publication number: 20220406847Abstract: A memory system may include separate amounts or types of resistive material that may be deposited over memory cells and conductive vias using separate resistive layers in the access lines. A first resistive material layer may be deposited over the memory cells prior to performing an array termination etch used to deposit the conductive via. The array termination etch may remove the first resistive material over the portion of the array used to deposit the conductive via. A second resistive material layer may be deposited after the etch has occurred and the conductive via has been formed. The second resistive material layer may be deposited over the conductive via.Type: ApplicationFiled: June 22, 2022Publication date: December 22, 2022Inventors: Lei Wei, Pengyuan Zheng, Kevin Lee Baker, Efe Sinan Ege, Adam Thomas Barton, Rajasekhar Venigalla
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Publication number: 20220320316Abstract: A method of forming a nanosheet device, including forming a channel stack on a substrate, where the channel stack includes at least one nanosheet channel layer and at least one sacrificial release layer, forming a stack cover layer on at least a portion of the channel stack, forming a dummy gate on at least a portion of the stack cover layer, wherein at least a portion of the at least one nanosheet channel layer and at least one sacrificial release layer is exposed on opposite sides of the dummy gate, removing at least a portion of the at least one sacrificial release layer on each side of the dummy gate to form a sacrificial supporting rib, and forming an inner spacer layer on exposed portions of the at least one nanosheet channel layer and at least one sacrificial supporting rib.Type: ApplicationFiled: April 22, 2022Publication date: October 6, 2022Inventors: Michael A. Guillorn, Terence B. Hook, Robert R. Robison, Reinaldo A. Vega, Rajasekhar Venigalla
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Patent number: 11380732Abstract: A memory system may include separate amounts or types of resistive material that may be deposited over memory cells and conductive vias using separate resistive layers in the access lines. A first resistive material layer may be deposited over the memory cells prior to performing an array termination etch used to deposit the conductive via. The array termination etch may remove the first resistive material over the portion of the array used to deposit the conductive via. A second resistive material layer may be deposited after the etch has occurred and the conductive via has been formed. The second resistive material layer may be deposited over the conductive via.Type: GrantFiled: July 29, 2020Date of Patent: July 5, 2022Assignee: Micron Technology, Inc.Inventors: Lei Wei, Pengyuan Zheng, Kevin Lee Baker, Efe Sinan Ege, Adam Thomas Barton, Rajasekhar Venigalla
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Publication number: 20220208264Abstract: Methods, systems, and devices supporting a socket design for a memory device are described. A die may include one or more memory arrays, which each may include any number of word lines and any number of bit lines. The word lines and the bit lines may be oriented in different directions, and memory cells may be located at the intersections of word lines and bit lines. Sockets may couple the word lines and bit lines to associated drivers, and the sockets may be located such that memory cells farther from a corresponding word line socket are nearer a corresponding bit line socket, and vice versa. For example, sockets may be disposed in rows or regions that are parallel to one another, and which may be non-orthogonal to the corresponding word lines and bit lines.Type: ApplicationFiled: January 4, 2022Publication date: June 30, 2022Inventors: Amitava Majumdar, Radhakrishna Kotti, Rajasekhar Venigalla
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Patent number: 11342446Abstract: A method of forming a nanosheet device, including forming a channel stack on a substrate, where the channel stack includes at least one nanosheet channel layer and at least one sacrificial release layer, forming a stack cover layer on at least a portion of the channel stack, forming a dummy gate on at least a portion of the stack cover layer, wherein at least a portion of the at least one nanosheet channel layer and at least one sacrificial release layer is exposed on opposite sides of the dummy gate, removing at least a portion of the at least one sacrificial release layer on each side of the dummy gate to form a sacrificial supporting rib, and forming an inner spacer layer on exposed portions of the at least one nanosheet channel layer and at least one sacrificial supporting rib.Type: GrantFiled: November 14, 2019Date of Patent: May 24, 2022Assignee: Tessera, Inc.Inventors: Michael A. Guillorn, Terence B. Hook, Robert R. Robison, Reinaldo A. Vega, Rajasekhar Venigalla