Patents by Inventor Melissa O. Zavala

Melissa O. Zavala 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: 7821067
    Abstract: An electronic device can include a first semiconductor portion and a second semiconductor portion, wherein the compositions of the first and second semiconductor portions are different from each other. In one embodiment, the first and second semiconductor portions can have different stresses compared to each other. In one embodiment, the electronic device may be formed by forming an oxidation mask over the first semiconductor portion. A second semiconductor layer can be formed over the second semiconductor portion of the first semiconductor layer and have a different composition compared to the first semiconductor layer. An oxidation can be performed, and a concentration of a semiconductor element (e.g., germanium) within the second portion of the first semiconductor layer can be increased. In another embodiment, a selective condensation may be performed, and a field isolation region can be formed between the first and second portions of the first semiconductor layer.
    Type: Grant
    Filed: August 10, 2007
    Date of Patent: October 26, 2010
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Voon-Yew Thean, Brian J. Goolsby, Linda B. McCormick, Bich-Yen Nguyen, Colita M. Parker, Mariam G. Sadaka, Victor H. Vartanian, Ted R. White, Melissa O. Zavala
  • Patent number: 7737496
    Abstract: An electronic device can include a first semiconductor portion and a second semiconductor portion, wherein the compositions of the first and second semiconductor portions are different from each other. In one embodiment, the first and second semiconductor portions can have different stresses compared to each other. In one embodiment, the electronic device may be formed by forming an oxidation mask over the first semiconductor portion. A second semiconductor layer can be formed over the second semiconductor portion of the first semiconductor layer and have a different composition compared to the first semiconductor layer. An oxidation can be performed, and a concentration of a semiconductor element (e.g., germanium) within the second portion of the first semiconductor layer can be increased. In another embodiment, a selective condensation may be performed, and a field isolation region can be formed between the first and second portions of the first semiconductor layer.
    Type: Grant
    Filed: August 10, 2007
    Date of Patent: June 15, 2010
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Voon-Yew Thean, Brian J. Goolsby, Linda B. McCormick, Bich-Yen Nguyen, Colita M. Parker, Mariam G. Sadaka, Victor H. Vartanian, Ted R. White, Melissa O. Zavala
  • Patent number: 7575968
    Abstract: A semiconductor process and apparatus provide a high performance CMOS devices (108, 109) with hybrid or dual substrates by etching a deposited oxide layer (62) using inverse slope isolation techniques to form tapered isolation regions (76) and expose underlying semiconductor layers (41, 42) in a bulk wafer structure prior to epitaxially growing the first and second substrates (84, 82) having different surface orientations that may be planarized with a single CMP process. By forming first gate electrodes (104) over a first substrate (84) that is formed by epitaxially growing (100) silicon and forming second gate electrodes (103) over a second substrate (82) that is formed by epitaxially growing (110) silicon, a high performance CMOS device is obtained which includes high-k metal PMOS gate electrodes having improved hole mobility.
    Type: Grant
    Filed: April 30, 2007
    Date of Patent: August 18, 2009
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Mariam G. Sadaka, Debby Eades, Joe Mogab, Bich-Yen Nguyen, Melissa O. Zavala, Gregory S. Spencer
  • Publication number: 20080268587
    Abstract: A semiconductor process and apparatus provide a high performance CMOS devices (108, 109) with hybrid or dual substrates by etching a deposited oxide layer (62) using inverse slope isolation techniques to form tapered isolation regions (76) and expose underlying semiconductor layers (41, 42) in a bulk wafer structure prior to epitaxially growing the first and second substrates (84, 82) having different surface orientations that may be planarized with a single CMP process. By forming first gate electrodes (104) over a first substrate (84) that is formed by epitaxially growing (100) silicon and forming second gate electrodes (103) over a second substrate (82) that is formed by epitaxially growing (110) silicon, a high performance CMOS device is obtained which includes high-k metal PMOS gate electrodes having improved hole mobility.
    Type: Application
    Filed: April 30, 2007
    Publication date: October 30, 2008
    Inventors: Mariam G. Sadaka, Debby Eades, Joe Mogab, Bich-Yen Nguyen, Melissa O. Zavala, Gregory S. Spencer
  • Patent number: 7265004
    Abstract: An electronic device can include a first semiconductor portion and a second semiconductor portion, wherein the compositions of the first and second semiconductor portions are different from each other. In one embodiment, the first and second semiconductor portions can have different stresses compared to each other. In one embodiment, the electronic device may be formed by forming an oxidation mask over the first semiconductor portion. A second semiconductor layer can be formed over the second semiconductor portion of the first semiconductor layer and have a different composition compared to the first semiconductor layer. An oxidation can be performed, and a concentration of a semiconductor element (e.g., germanium) within the second portion of the first semiconductor layer can be increased. In another embodiment, a selective condensation may be performed, and a field isolation region can be formed between the first and second portions of the first semiconductor layer.
    Type: Grant
    Filed: November 14, 2005
    Date of Patent: September 4, 2007
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Voon-Yew Thean, Brian J. Goolsby, Linda B. McCormick, Bich-Yen Nguyen, Colita M. Parker, Mariam G. Sadaka, Victor H. Vartanian, Ted R. White, Melissa O. Zavala
  • Patent number: 6949455
    Abstract: A method for providing gates of transistors with at least two different work functions utilizes a silicidation of two different metals at different times, silicidation for one gate and polysilicon for the other, or silicidation using a single metal with two differently doped silicon structures. Thus the problem associated with performing silicidation of two different metals at the same time is avoided. If the two metals have significantly different silicidation temperatures, the one with the lower temperature silicidation will likely have significantly degraded performance as a result of having to also experience the higher temperature required to achieve silicidation with the other metal.
    Type: Grant
    Filed: October 1, 2003
    Date of Patent: September 27, 2005
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Daniel Thanh-Khac Pham, Bich-Yen Nguyen, James K. Schaeffer, Melissa O. Zavala, Sherry G. Straub, Kimberly G. Reid, Marc Rossow, James P. Geren
  • Publication number: 20040063285
    Abstract: A method for providing gates of transistors with at least two different work functions utilizes a silicidation of two different metals at different times, silicidation for one gate and polysilicon for the other, or silicidation using a single metal with two differently doped silicon structures. Thus the problem associated with performing silicidation of two different metals at the same time is avoided. If the two metals have significantly different silicidation temperatures, the one with the lower temperature silicidation will likely have significantly degraded performance as a result of having to also experience the higher temperature required to achieve silicidation with the other metal.
    Type: Application
    Filed: October 1, 2003
    Publication date: April 1, 2004
    Inventors: Daniel Thanh-Khac Pham, Bich-Yen Nguyen, James K. Schaeffer, Melissa O. Zavala, Sherry G. Straub, Kimberly G. Reid, Marc Rossow, James P. Geren
  • Publication number: 20040018681
    Abstract: A method for providing gates of transistors with at least two different work functions utilizes a silicidation of two different metals at different times, silicidation for one gate and polysilicon for the other, or silicidation using a single metal with two differently doped silicon structures. Thus the problem associated with performing silicidation of two different metals at the same time is avoided. If the two metals have significantly different silicidation temperatures, the one with the lower temperature silicidation will likely have significantly degraded performance as a result of having to also experience the higher temperature required to achieve silicidation with the other metal.
    Type: Application
    Filed: July 26, 2002
    Publication date: January 29, 2004
    Inventors: Daniel Thanh-Khac Pham, Bich-Yen Nguyen, James K. Schaeffer, Melissa O. Zavala, Sherry G. Straub, Al T. Koh, Yeong-Jyh T. Lii, Robert F. Steimle, Anne Vandooren, Ricardo Garcia, Kimberly G. Reid, Marc Rossow, James P. Geren