Patents by Inventor Ravi Iyer

Ravi Iyer 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).

  • Patent number: 7109115
    Abstract: Various embodiments of the invention described herein reduce contact resistance to a silicon-containing material using a first refractory metal material overlying the silicon-containing material and a second refractory metal material overlying the first refractory metal material. Each refractory metal material is a conductive material containing a refractory metal and an impurity. The first refractory metal material is a metal-rich material, containing a level of its impurity at less than a stoichiometric level. The second refractory metal material has a lower affinity for the impurities than does the first refractory metal material. The second refractory metal material can thus serve as an impurity donor during an anneal or other exposure to heat.
    Type: Grant
    Filed: March 4, 2005
    Date of Patent: September 19, 2006
    Assignee: Micron Technology, Inc.
    Inventors: Ravi Iyer, Yongjun Jeff Hu, Luan Tran, Brent Gilgen
  • Patent number: 7101815
    Abstract: A method for depositing highly conformal silicate glass layers via chemical vapor deposition through the reaction of TEOS and O3 is provided, comprising placing an in-process semiconductor wafer having multiple surface constituents in a plasma-enhanced chemical vapor deposition chamber.
    Type: Grant
    Filed: August 26, 2004
    Date of Patent: September 5, 2006
    Assignee: Micron Technology, Inc.
    Inventor: Ravi Iyer
  • Patent number: 7078342
    Abstract: A method for forming a gate stack which minimizes or eliminates damage to the gate dielectric layer and/or silicon substrate during the gate stack formation by the reduction of the temperature during formation. The temperature reduction prevents the formation of silicon clusters within the metallic silicide film in the gate stack which has been found to cause damage during the gate etch step. The present invention also includes methods for dispersing silicon clusters prior to the gate etch step.
    Type: Grant
    Filed: May 6, 1998
    Date of Patent: July 18, 2006
    Assignee: Micron Technology, Inc.
    Inventors: Pai-Hung Pan, Louie LiĆ¹, Ravi Iyer
  • Patent number: 7067442
    Abstract: A method of fabricating an integrated circuit having reduced threshold voltage shift is provided. A nonconducting region is formed on the semiconductor substrate and active regions are formed on the semiconductor substrate. The active regions are separated by the nonconducting region. A barrier layer and a dielectric layer are deposited over the nonconducting region and over the active regions. Heat is applied to the integrated circuit causing the barrier layer to anneal.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: June 27, 2006
    Assignee: Micron Technology, Inc.
    Inventors: Randhir P. S. Thakur, Ravi Iyer, Howard Rhodes
  • Publication number: 20060134912
    Abstract: A process for depositing titanium metal layers via chemical vapor deposition is disclosed. The process provides deposited titanium layers having a high degree of conformality, even in trenches and contact openings having aspect ratios greater than 1:5.
    Type: Application
    Filed: December 9, 2005
    Publication date: June 22, 2006
    Inventors: Ravi Iyer, Sujit Sharan
  • Publication number: 20060104303
    Abstract: In general, in one aspect, the disclosures describes a method that includes receiving multiple ingress Internet Protocol packets, each of the multiple ingress Internet Protocol packets having an Internet Protocol header and a Transmission Control Protocol segment having a Transmission Control Protocol header and a Transmission Control Protocol payload, where the multiple packets belonging to a same Transmission Control Protocol/Internet Protocol flow. The method also includes preparing an Internet Protocol packet having a single Internet Protocol header and a single Transmission Control Protocol segment having a single Transmission Control Protocol header and a single payload formed by a combination of the Transmission Control Protocol segment payloads of the multiple Internet Protocol packets. The method further includes generating a signal that causes receive processing of the Internet Protocol packet.
    Type: Application
    Filed: November 16, 2004
    Publication date: May 18, 2006
    Inventors: Srihari Makineni, Ravi Iyer, Dave Minturn, Sujoy Sen, Donald Newell, Li Zhao
  • Patent number: 7041548
    Abstract: A method for forming a gate stack which minimizes or eliminates damage to the gate dielectric layer and/or silicon substrate during the gate stack formation by the reduction of the temperature during formation. The temperature reduction prevents the formation of silicon clusters within the metallic silicide film in the gate stack which has been found to cause damage during the gate etch step. The present invention also includes methods for dispersing silicon clusters prior to the gate etch step.
    Type: Grant
    Filed: July 12, 2000
    Date of Patent: May 9, 2006
    Assignee: Micron Technology, Inc.
    Inventors: Pai-Hung Pan, Louie Liu, Ravi Iyer
  • Patent number: 7037829
    Abstract: Various embodiments of the invention described herein reduce contact resistance to a silicon-containing material using a first refractory metal material overlying the silicon-containing material and a second refractory metal material overlying the first refractory metal material. Each refractory metal material is a conductive material containing a refractory metal and an impurity. The first refractory metal material is a metal-rich material, containing a level of its impurity at less than a stoichiometric level. The second refractory metal material has a lower affinity for the impurities than does the first refractory metal material. The second refractory metal material can thus serve as an impurity donor during an anneal or other exposure to heat.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: May 2, 2006
    Assignee: Micron Technology, Inc.
    Inventors: Ravi Iyer, Yongjun Jeff Hu, Luan Tran, Brent Gilgen
  • Patent number: 7038318
    Abstract: Various embodiments of the invention described herein reduce contact resistance to a silicon-containing material using a first refractory metal material overlying the silicon-containing material and a second refractory metal material overlying the first refractory metal material. Each refractory metal material is a conductive material containing a refractory metal and an impurity. The first refractory metal material is a metal-rich material, containing a level of its impurity at less than a stoichiometric level. The second refractory metal material has a lower affinity for the impurities than does the first refractory metal material. The second refractory metal material can thus serve as an impurity donor during an anneal or other exposure to heat.
    Type: Grant
    Filed: October 21, 2003
    Date of Patent: May 2, 2006
    Assignee: Micron Technology, Inc.
    Inventors: Ravi Iyer, Yongjun Jeff Hu, Luan Tran, Brent Gilgen
  • Publication number: 20060029736
    Abstract: Disclosed is a CVD ozone (O3) deposition process, with the preferred embodiment comprising the steps of disposing a substrate in a chemical vapor deposition chamber and exposing the substrate surface to a SiO2 precursor gas, a carrier gas, and optionally a dopant gas in the presence of ozone and exposing the reaction volume of the gases above the substrate surface to a high intensity light source, to increase the functional atomic oxygen concentration and reduce the fixed charge in the deposited films.
    Type: Application
    Filed: July 27, 2005
    Publication date: February 9, 2006
    Inventors: Gurtej S. Sandhu, Ravi Iyer
  • Publication number: 20060030162
    Abstract: A method of fabricating an integrated circuit having reduced threshold voltage shift is provided. A nonconducting region is formed on the semiconductor substrate and active regions are formed on the semiconductor substrate. The active regions are separated by the nonconducting region. A barrier layer and a dielectric layer are deposited over the nonconducting region and over the active regions. Heat is applied to the integrated circuit causing the barrier layer to anneal.
    Type: Application
    Filed: October 3, 2005
    Publication date: February 9, 2006
    Inventors: Randhir Thakur, Ravi Iyer, Howard Rhodes
  • Patent number: 6977225
    Abstract: A new process for depositing titanium metal layers via chemical vapor deposition is disclosed. The process provides deposited titanium layers having a high degree of conformality, even in trenches and contact openings having aspect ratios greater than 1:5.
    Type: Grant
    Filed: November 12, 2003
    Date of Patent: December 20, 2005
    Assignee: Micron Technology, Inc.
    Inventors: Ravi Iyer, Sujit Sharan
  • Publication number: 20050255689
    Abstract: A method for depositing highly conformal silicate glass layers via chemical vapor deposition through the reaction of TEOS and O3 is provided, comprising placing an in-process semiconductor wafer having multiple surface constituents in a plasma-enhanced chemical vapor deposition chamber.
    Type: Application
    Filed: July 6, 2005
    Publication date: November 17, 2005
    Inventor: Ravi Iyer
  • Patent number: 6952051
    Abstract: An interlevel dielectric structure includes first and second dielectric layers between which are located lines of a conductive material with a dielectric material in spaces between the lines of conductive material, with the lower surface of the dielectric material extending lower than the lower surface of lines of conductive material adjacent thereto, and the upper surface of the dielectric material extending higher than the upper surface of conductive material adjacent thereto, thus reducing fringe and total capacitance between the lines of conductive material. The dielectric material, which has a dielectric constant of less than about 3.6, does not extend directly above the upper surface of the lines of conductive material, allowing formation of subsequent contacts down to the lines of conductive material without exposing the dielectric material to further processing. Various methods for forming the interlevel dielectric structure are disclosed.
    Type: Grant
    Filed: July 28, 2000
    Date of Patent: October 4, 2005
    Assignee: Micron Technology, Inc.
    Inventors: Gurtej Sandhu, Anand Srinivasan, Ravi Iyer
  • Publication number: 20050181599
    Abstract: Various embodiments of the invention described herein reduce contact resistance to a silicon-containing material using a first refractory metal material overlying the silicon-containing material and a second refractory metal material overlying the first refractory metal material. Each refractory metal material is a conductive material containing a refractory metal and an impurity. The first refractory metal material is a metal-rich material, containing a level of its impurity at less than a stoichiometric level. The second refractory metal material has a lower affinity for the impurities than does the first refractory metal material. The second refractory metal material can thus serve as an impurity donor during an anneal or other exposure to heat.
    Type: Application
    Filed: March 4, 2005
    Publication date: August 18, 2005
    Inventors: Ravi Iyer, Yongjun Hu, Luan Tran, Brent Gilgen
  • Publication number: 20050161721
    Abstract: Various embodiments of the invention described herein reduce contact resistance to a silicon-containing material using a first refractory metal material overlying the silicon-containing material and a second refractory metal material overlying the first refractory metal material. Each refractory metal material is a conductive material containing a refractory metal and an impurity. The first refractory metal material is a metal-rich material, containing a level of its impurity at less than a stoichiometric level. The second refractory metal material has a lower affinity for the impurities than does the first refractory metal material. The second refractory metal material can thus serve as an impurity donor during an anneal or other exposure to heat.
    Type: Application
    Filed: March 4, 2005
    Publication date: July 28, 2005
    Inventors: Ravi Iyer, Yongjun Hu, Luan Tran, Brent Gilgen
  • Publication number: 20050121794
    Abstract: The invention encompasses methods of forming insulating materials between conductive elements. In one aspect, the invention includes a method of forming a material adjacent a conductive electrical component comprising: a) partially vaporizing a mass to form a matrix adjacent the conductive electrical component, the matrix having at least one void within it. In another aspect, the invention includes a method of forming a material between a pair of conductive electrical components comprising the following steps: a) forming a pair of conductive electrical components within a mass and separated by an expanse of the mass; b) forming at least one support member within the expanse of the mass, the support member not comprising a conductive interconnect; and c) vaporizing the expanse of the mass to a degree effective to form at least one void between the support member and each of the pair of conductive electrical components.
    Type: Application
    Filed: December 29, 2004
    Publication date: June 9, 2005
    Inventors: Werner Juengling, Kirk Prall, Ravi Iyer, Gurtej Sandhu, Guy Blalock
  • Patent number: 6888212
    Abstract: A method of forming isolation regions in a silicon substrate comprising the steps of forming a trench in the silicon substrate, filling the trench with a silanol polymer material then heating the silanol polymer material so that silicon dioxide is formed in the trench and thereby forms the isolation region. In the preferred embodiment, the silicon substrate is covered by a masking stack which is then etched to expose the underlying silicon substrate. The silicon substrate is then etched to form the trench and the silanol polymer material is deposited in the trench and fills the trench from the bottom up thereby avoiding divots and other defects. The silanol polymer grows faster on the silicon substrate than it does on the nitride. After the silanol polymer is reacted to form the silicon dioxide, CMP polishing is then used to remove the remaining masking stack and silicon dioxide above the surface of the silicon substrate.
    Type: Grant
    Filed: September 24, 2002
    Date of Patent: May 3, 2005
    Assignee: Micron Technology, Inc.
    Inventors: Ravi Iyer, Gurtej Sandhu, Pai Pan
  • Patent number: 6864561
    Abstract: The fixed charge in a borophosphosilicate glass insulating film deposited on a semiconductor device is reduced by reacting an organic precursor such as TEOS with O3. When done at temperatures higher than approximately 480 degrees C., the carbon level in the resulting film appears to be reduced, resulting in a higher threshold voltage for field transistor devices.
    Type: Grant
    Filed: December 4, 2003
    Date of Patent: March 8, 2005
    Assignee: Micron Technology, Inc.
    Inventors: Ravi Iyer, Randhir P. S. Thakur, Howard E. Rhodes
  • Patent number: 6858526
    Abstract: The invention encompasses methods of forming insulating materials between conductive elements. In one aspect, the invention includes a method of forming a material adjacent a conductive electrical component comprising: a) partially vaporizing a mass to form a matrix adjacent the conductive electrical component, the matrix having at least one void within it. In another aspect, the invention includes a method of forming a material between a pair of conductive electrical components comprising the following steps: a) forming a pair of conductive electrical components within a mass and separated by an expanse of the mass; b) forming at least one support member within the expanse of the mass, the support member not comprising a conductive interconnect; and c) vaporizing the expanse of the mass to a degree effective to form at least one void between the support member and each of the pair of conductive electrical components.
    Type: Grant
    Filed: March 28, 2001
    Date of Patent: February 22, 2005
    Assignee: Micron Technology, Inc.
    Inventors: Werner Juengling, Kirk D. Prall, Ravi Iyer, Gurtej S. Sandhu, Guy Blalock