Patents by Inventor Pragati Kumar
Pragati Kumar 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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Patent number: 12531208Abstract: A plasma enhanced chemical vapor deposition processing method is provided and includes: preheating a showerhead to a preheated state prior to and in preparation of a plasma enhanced chemical vapor deposition process of a substrate; determining at least one temperature of the showerhead while preheating the showerhead; determining based on the at least one temperature whether to continue preheating the showerhead; ceasing to preheat the showerhead in response to the at least one temperature satisfying a temperature criterion; and initiating the plasma enhanced chemical vapor deposition process while the showerhead is in the preheated state to package previously fabricated integrated circuits disposed on the substrate, wherein the plasma enhanced chemical vapor deposition process includes forming one or more film protective layers over the integrated circuits.Type: GrantFiled: September 16, 2020Date of Patent: January 20, 2026Assignee: Lam Research CorporationInventors: Boyi Hao, Joseph Wei, Chengzhu Qi, Pragati Kumar, Sardar Sardari
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Publication number: 20220336191Abstract: A plasma enhanced chemical vapor deposition processing method is provided and includes: preheating a showerhead to a preheated state prior to and in preparation of a plasma enhanced chemical vapor deposition process of a substrate; determining at least one temperature of the showerhead while preheating the showerhead; determining based on the at least one temperature whether to continue preheating the showerhead; ceasing to preheat the showerhead in response to the at least one temperature satisfying a temperature criterion; and initiating the plasma enhanced chemical vapor deposition process while the showerhead is in the preheated state to package previously fabricated integrated circuits disposed on the substrate, wherein the plasma enhanced chemical vapor deposition process includes forming one or more film protective layers over the integrated circuits.Type: ApplicationFiled: September 16, 2020Publication date: October 20, 2022Inventors: Boyi HAO, Joseph WEI, Chengzhu QI, Pragati KUMAR, Sardar SARDARI
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Publication number: 20200098562Abstract: A method for performing plasma enhanced chemical vapor deposition (PECVD) using a dual frequency process to deposit a silane-based oxide film on a substrate includes arranging the substrate on a substrate support in a processing chamber configured to perform PECVD and supplying PECVD process gases into the processing chamber. The process gases include a first process gas including silicon and a second process gas including an oxidant. The method further includes, while supplying the PECVD process gases into the processing chamber, generating a dual frequency plasma within the processing chamber to deposit the silane-based oxide film on the substrate by supplying a first radio frequency (RF) voltage to the processing chamber, and supplying a second RF voltage to the processing chamber. The first RF voltage is supplied at a first frequency and the second RF voltage is supplied at a second frequency that is different than the first frequency.Type: ApplicationFiled: September 26, 2018Publication date: March 26, 2020Inventors: Joseph Wei, Boyi Hao, Pragati Kumar
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Patent number: 9397292Abstract: Resistive switching nonvolatile memory elements are provided. A metal-containing layer and an oxide layer for a memory element can be heated using rapid thermal annealing techniques. During heating, the oxide layer may decompose and react with the metal-containing layer. Oxygen from the decomposing oxide layer may form a metal oxide with metal from the metal-containing layer. The resulting metal oxide may exhibit resistive switching for the resistive switching memory elements.Type: GrantFiled: October 2, 2014Date of Patent: July 19, 2016Assignee: Intermolecular, Inc.Inventors: Pragati Kumar, Sean Barstow, Tony P. Chiang, Sunil Shanker
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Patent number: 9362497Abstract: This disclosure provides a nonvolatile memory device and related methods of manufacture and operation. The device may include one or more resistive random access memory (ReRAM) approaches to provide a memory device with more predictable operation. In particular, the forming voltage required by particular designs may be reduced through the use of a barrier layer, a reverse polarity forming voltage pulse, a forming voltage pulse where electrons are injected from a lower work function electrode, or an anneal in a reducing environment. One or more of these techniques may be applied, depending on the desired application and results.Type: GrantFiled: January 13, 2015Date of Patent: June 7, 2016Assignee: Intermolecular, Inc.Inventors: Pragati Kumar, Tony P. Chiang, Prashant B Phatak, Yun Wang
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Patent number: 9276211Abstract: Non-volatile resistive-switching memories are described, including a memory element having a first electrode, a second electrode, a metal oxide between the first electrode and the second electrode. The metal oxide switches using bulk-mediated switching, has a bandgap greater than 4 electron volts (eV), has a set voltage for a set operation of at least one volt per one hundred angstroms of a thickness of the metal oxide, and has a leakage current density less than 40 amps per square centimeter (A/cm2) measured at 0.5 volts (V) per twenty angstroms of the thickness of the metal oxide.Type: GrantFiled: May 26, 2015Date of Patent: March 1, 2016Assignee: Intermolecular, Inc.Inventors: Prashant B Phatak, Tony P. Chiang, Pragati Kumar, Michael Miller
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Patent number: 9252360Abstract: ALD processing techniques for forming non-volatile resistive-switching memories are described. In one embodiment, a method includes forming a first electrode on a substrate, maintaining a pedestal temperature for an atomic layer deposition (ALD) process of less than 100° Celsius, forming at least one metal oxide layer over the first electrode, wherein the forming the at least one metal oxide layer is performed using the ALD process using a purge duration of less than 20 seconds, and forming a second electrode over the at least one metal oxide layer.Type: GrantFiled: August 25, 2014Date of Patent: February 2, 2016Assignee: Intermolecular, Inc.Inventors: Nobumichi Fuchigami, Pragati Kumar, Prashant B Phatak
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Publication number: 20150255716Abstract: Non-volatile resistive-switching memories are described, including a memory element having a first electrode, a second electrode, a metal oxide between the first electrode and the second electrode. The metal oxide switches using bulk-mediated switching, has a bandgap greater than 4 electron volts (eV), has a set voltage for a set operation of at least one volt per one hundred angstroms of a thickness of the metal oxide, and has a leakage current density less than 40 amps per square centimeter (A/cm2) measured at 0.5 volts (V) per twenty angstroms of the thickness of the metal oxide.Type: ApplicationFiled: May 26, 2015Publication date: September 10, 2015Inventors: Prashant B Phatak, Tony P. Chiang, Pragati Kumar, Michael Miller
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Patent number: 9082782Abstract: This disclosure provides a method of fabricating a semiconductor stack and associated device, such as a capacitor and DRAM cell. In particular, a bottom electrode has a material selected for lattice matching characteristics. This material may be created from a relatively inexpensive metal oxide which is processed to adopt a conductive, but difficult-to-produce oxide state, with specific crystalline form; to provide one example, specific materials are disclosed that are compatible with the growth of rutile phase titanium dioxide (TiO2) for use as a dielectric, thereby leading to predictable and reproducible higher dielectric constant and lower effective oxide thickness and, thus, greater part density at lower cost.Type: GrantFiled: October 19, 2012Date of Patent: July 14, 2015Assignee: Intermolecular, Inc.Inventors: Hanhong Chen, Toshiyuki Hirota, Pragati Kumar, Xiangxin Rui, Sunil Shanker
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Patent number: 9070867Abstract: Non-volatile resistive-switching memories are described, including a memory element having a first electrode, a second electrode, a metal oxide between the first electrode and the second electrode. The metal oxide switches using bulk-mediated switching, has a bandgap greater than 4 electron volts (eV), has a set voltage for a set operation of at least one volt per one hundred angstroms of a thickness of the metal oxide, and has a leakage current density less than 40 amps per square centimeter (A/cm2) measured at 0.5 volts (V) per twenty angstroms of the thickness of the metal oxide.Type: GrantFiled: November 21, 2014Date of Patent: June 30, 2015Assignee: Intermolecular, Inc.Inventors: Prashant B Phatak, Tony P. Chiang, Pragati Kumar, Michael Miller
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Publication number: 20150137064Abstract: This disclosure provides a nonvolatile memory device and related methods of manufacture and operation. The device may include one or more resistive random access memory (ReRAM) approaches to provide a memory device with more predictable operation. In particular, the forming voltage required by particular designs may be reduced through the use of a barrier layer, a reverse polarity forming voltage pulse, a forming voltage pulse where electrons are injected from a lower work function electrode, or an anneal in a reducing environment. One or more of these techniques may be applied, depending on the desired application and results.Type: ApplicationFiled: January 13, 2015Publication date: May 21, 2015Inventors: Pragati Kumar, Tony P. Chiang, Prashant B. Phatak, Yun Wang
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Patent number: 9029232Abstract: Nonvolatile memory elements that are based on resistive switching memory element layers are provided. A nonvolatile memory element may have a resistive switching metal oxide layer. The resistive switching metal oxide layer may have one or more layers of oxide. A resistive switching metal oxide may be doped with a dopant that increases its melting temperature and enhances its thermal stability. Layers may be formed to enhance the thermal stability of the nonvolatile memory element. An electrode for a nonvolatile memory element may contain a conductive layer and a buffer layer.Type: GrantFiled: May 19, 2014Date of Patent: May 12, 2015Assignee: Intermolecular, Inc.Inventors: Sandra G Malhotra, Sean Barstow, Tony P. Chiang, Wayne R French, Pragati Kumar, Prashant B Phatak, Sunil Shanker, Wen Wu
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Patent number: 9030862Abstract: Nonvolatile memory elements including resistive switching metal oxides may be formed in one or more layers on an integrated circuit. Each memory element may have a first conductive layer, a metal oxide layer, and a second conductive layer. Electrical devices such as diodes may be coupled in series with the memory elements. The first conductive layer may be formed from a metal nitride. The metal oxide layer may contain the same metal as the first conductive layer. The metal oxide may form an ohmic contact or a Schottky contact with the first conductive layer. The second conductive layer may form an ohmic contact or Schottky contact with the metal oxide layer. The first conductive layer, the metal oxide layer, and the second conductive layer may include sublayers. The second conductive layer may include an adhesion or barrier layer and a workfunction control layer.Type: GrantFiled: September 17, 2014Date of Patent: May 12, 2015Assignee: Intermolecular, Inc.Inventors: Pragati Kumar, Sean Barstow, Tony P. Chiang, Sandra G Malhotra
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Publication number: 20150097153Abstract: Non-volatile resistive-switching memories are described, including a memory element having a first electrode, a second electrode, a metal oxide between the first electrode and the second electrode. The metal oxide switches using bulk-mediated switching, has a bandgap greater than 4 electron volts (eV), has a set voltage for a set operation of at least one volt per one hundred angstroms of a thickness of the metal oxide, and has a leakage current density less than 40 amps per square centimeter (A/cm2) measured at 0.5 volts (V) per twenty angstroms of the thickness of the metal oxide.Type: ApplicationFiled: November 21, 2014Publication date: April 9, 2015Inventors: Prashant B. Phatak, Tony P. Chiang, Pragati Kumar, Michael Miller
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Patent number: 8980744Abstract: This disclosure provides a method of fabricating a semiconductor stack and associated device, such as a capacitor and DRAM cell. In particular, a bottom electrode has a material selected for lattice matching characteristics. This material may be created from a relatively inexpensive metal oxide which is processed to adopt a conductive, but difficult-to-produce oxide state, with specific crystalline form; to provide one example, specific materials are disclosed that are compatible with the growth of rutile phase titanium dioxide (TiO2) for use as a dielectric, thereby leading to predictable and reproducible higher dielectric constant and lower effective oxide thickness and, thus, greater part density at lower cost.Type: GrantFiled: November 13, 2012Date of Patent: March 17, 2015Assignees: Intermolecular, Inc., Elpida Memory, Inc.Inventors: Hanhong Chen, Toshiyuki Hirota, Pragati Kumar, Xiangxin Rui, Sunil Shanker
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Patent number: 8975147Abstract: This disclosure provides a method of fabricating a semiconductor stack and associated device, such as a capacitor and DRAM cell. In particular, a bottom electrode has a material selected for lattice matching characteristics. This material may be created from a relatively inexpensive metal oxide which is processed to adopt a conductive, but difficult-to-produce oxide state, with specific crystalline form; to provide one example, specific materials are disclosed that are compatible with the growth of rutile phase titanium dioxide (TiO2) for use as a dielectric, thereby leading to predictable and reproducible higher dielectric constant and lower effective oxide thickness and, thus, greater part density at lower cost.Type: GrantFiled: December 7, 2012Date of Patent: March 10, 2015Assignees: Intermolecular, Inc., Elpida Memory, Inc.Inventors: Xiangxin Rui, Hanhong Chen, Pragati Kumar, Sandra G. Malhotra
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Publication number: 20150056748Abstract: Resistive switching nonvolatile memory elements are provided. A metal-containing layer and an oxide layer for a memory element can be heated using rapid thermal annealing techniques. During heating, the oxide layer may decompose and react with the metal-containing layer. Oxygen from the decomposing oxide layer may form a metal oxide with metal from the metal-containing layer. The resulting metal oxide may exhibit resistive switching for the resistive switching memory elements.Type: ApplicationFiled: October 2, 2014Publication date: February 26, 2015Inventors: Pragati Kumar, Sean Barstow, Tony P. Chiang, Sunil Shanker
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Patent number: 8963117Abstract: This disclosure provides a nonvolatile memory device and related methods of manufacture and operation. The device may include one or more resistive random access memory (ReRAM) approaches to provide a memory device with more predictable operation. In particular, the forming voltage required by particular designs may be reduced through the use of a barrier layer, a reverse polarity forming voltage pulse, a forming voltage pulse where electrons are injected from a lower work function electrode, or an anneal in a reducing environment. One or more of these techniques may be applied, depending on the desired application and results.Type: GrantFiled: September 5, 2013Date of Patent: February 24, 2015Assignee: Intermolecular, Inc.Inventors: Pragati Kumar, Tony P. Chiang, Prashant B Phatak, Yun Wang
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Publication number: 20150034896Abstract: Nonvolatile memory elements including resistive switching metal oxides may be formed in one or more layers on an integrated circuit. Each memory element may have a first conductive layer, a metal oxide layer, and a second conductive layer. Electrical devices such as diodes may be coupled in series with the memory elements. The first conductive layer may be formed from a metal nitride. The metal oxide layer may contain the same metal as the first conductive layer. The metal oxide may form an ohmic contact or a Schottky contact with the first conductive layer. The second conductive layer may form an ohmic contact or Schottky contact with the metal oxide layer. The first conductive layer, the metal oxide layer, and the second conductive layer may include sublayers. The second conductive layer may include an adhesion or barrier layer and a workfunction control layer.Type: ApplicationFiled: September 17, 2014Publication date: February 5, 2015Inventors: Pragati Kumar, Sean Barstow, Tony P. Chiang, Sandra G Malhotra
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Patent number: 8921156Abstract: Non-volatile resistive-switching memories are described, including a memory element having a first electrode, a second electrode, a metal oxide between the first electrode and the second electrode. The metal oxide switches using bulk-mediated switching, has a bandgap greater than 4 electron volts (eV), has a set voltage for a set operation of at least one volt per one hundred angstroms of a thickness of the metal oxide, and has a leakage current density less than 40 amps per square centimeter (A/cm2) measured at 0.5 volts (V) per twenty angstroms of the thickness of the metal oxide.Type: GrantFiled: October 4, 2013Date of Patent: December 30, 2014Assignee: Intermolecular, Inc.Inventors: Prashant B Phatak, Tony P. Chiang, Pragati Kumar, Michael Miller