Patents by Inventor Deepak A. Ramappa

Deepak A. Ramappa 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).

  • Publication number: 20100041246
    Abstract: An improved process of substrate cleaving and a device to perform the cleaving are disclosed. In the traditional cleaving process, a layer of microbubbles is created within a substrate through the implantation of ions of a gaseous species, such as hydrogen or helium. The size and spatial distribution of these microbubbles is enhanced through the use of ultrasound energy. The ultrasound energy causes smaller microbubbles to join together and also reduces the straggle. An ultrasonic transducer is acoustically linked with the substrate to facilitate these effects. In some embodiments, the ultrasonic transducer is in communication with the platen, such that ultrasound energy can be applied during ion implantation and/or immediately thereafter. In other embodiments, the ultrasonic energy is applied to the substrate during a subsequent process, such as an anneal.
    Type: Application
    Filed: August 11, 2009
    Publication date: February 18, 2010
    Inventor: Deepak Ramappa
  • Patent number: 7601629
    Abstract: The invention provides a method of fabricating a semiconductive device [200]. In this embodiment, the method comprises depositing a hydrocarbon layer [294] over a semiconductive substrate, forming an interconnect structure [295, 297] within the hydrocarbon layer [294], and removing the hydrocarbon layer [294] by sublimation.
    Type: Grant
    Filed: December 20, 2005
    Date of Patent: October 13, 2009
    Assignee: Texas Instruments Incorporated
    Inventors: Deepak A. Ramappa, Richard L. Guldi, Asad Haider, Frank Poag
  • Publication number: 20090227097
    Abstract: A method of tailoring the dopant profile of a substrate by utilizing two different dopants, each having a different diffusivity is disclosed. The substrate may be, for example, a solar cell. By introducing two different dopants, such as by ion implantation, furnace diffusion, or paste, it is possible to create the desired dopant profile. In addition, the dopants may be introduced simultaneously, partially simultaneously, or sequentially. Dopant pairs preferably consist of one lighter species and one heavier species, where the lighter species has a greater diffusivity. For example, dopant pairs such as boron and gallium, boron and indium, phosphorus and arsenic, and phosphorus and antimony, can be utilized.
    Type: Application
    Filed: March 4, 2009
    Publication date: September 10, 2009
    Inventors: Nicholas Bateman, Atul Gupta, Christopher Hatem, Deepak Ramappa
  • Publication number: 20090227087
    Abstract: Embodiments of this method improve the results of a chemical mechanical polishing (CMP) process. A surface is implanted with a species, such as, for example, Si, Ge, As, B, P, H, He, Ne, Ar, Kr, Xe, and C. The implant of this species will at least affect dishing, erosion, and polishing rates of the CMP process. The species may be selected in one embodiment to either accelerate or decelerate the CMP process. The dose of the species may be varied over the surface in one particular embodiment.
    Type: Application
    Filed: December 10, 2008
    Publication date: September 10, 2009
    Applicant: Varian Semiconductor Equipment associates, Inc.
    Inventors: Deepak RAMAPPA, Thirumal Thanigaivelan
  • Publication number: 20090212793
    Abstract: A method for detecting defects during semiconductor device processing can include providing a substrate having a semiconductor comprising layer with electrically isolated application and test circuits are formed thereon, directing an electron current inducing beam to the test circuit; measuring a current between the first and the second contact pads in the test circuit; determining an electron beam induced current (EBIC); and identifying one or more defect locations in the test circuit based on the EBIC and a location of the electron beam corresponding to the EBIC. A test circuit can include a plurality of semiconductor devices connected in parallel, a first contact pad coupled to a first terminal of the semiconductor devices, and at least a second contact pad coupled to a substrate terminal associated with the semiconductor devices.
    Type: Application
    Filed: February 26, 2008
    Publication date: August 27, 2009
    Inventors: Richard L. Guldi, Toan Tran, Deepak A. Ramappa
  • Publication number: 20090170221
    Abstract: Methods for forming dual damascene interconnect structures are provided. The methods incorporate an ashing operation comprising a first ash operation and a second overash operation. The ashing operation is performed prior to etching of an etch stop layer. The operation removes residue from a cavity formed during formation of the interconnect structure and facilitates better CD control without altering the cavity profiles.
    Type: Application
    Filed: December 28, 2007
    Publication date: July 2, 2009
    Applicant: Texas Instruments Incorporated
    Inventors: Jeannette Michelle Jacques, Deepak A. Ramappa
  • Publication number: 20090121353
    Abstract: In accordance with the invention, there are methods of making semiconductor devices. The method can include forming a hard mask layer over a dielectric layer, forming a via through the hard mask layer and the dielectric layer, and depositing an anti-reflective coating in the via and over the hard mask layer. The method can also include etching a trench through the hard mask layer, etching a dummy fill pattern in the hard mask layer to a desired thickness, and etching the trench through the dielectric layer and the dummy fill through the hard mask layer and in the dielectric layer. The method can further include depositing copper in the via and in the trench and removing excess copper using chemical mechanical polishing, wherein the dummy fill in the dielectric layer is of desired reduced depth.
    Type: Application
    Filed: November 13, 2007
    Publication date: May 14, 2009
    Inventors: Deepak A. Ramappa, Eden M. Zielinski
  • Publication number: 20090102501
    Abstract: In accordance with the invention, there are electron beam inspection systems, electron beam testable semiconductor test structures, and methods for detecting systematic defects, such as, for example contact-to-gate shorts, worm hole leakage paths, holes printing issues, and anomalies in sparse holes and random defects, such as, current leakage paths due to dislocations and pipes during semiconductor processing.
    Type: Application
    Filed: October 19, 2007
    Publication date: April 23, 2009
    Inventors: Richard L. Guldi, Toan Tran, Deepak Ramappa, Steven A. Lytle
  • Publication number: 20090087938
    Abstract: Current manufacturing of miniature or micro electronic mechanical optical chemical or biophysical devices utilizes discrete substrates holding one or more said devices. The use of discrete substrates entails several disadvantages with respect to economical manufacturing. This invention is a method of manufacturing devices using flexible carrier sheets with device substrates attached to the carrier sheet, storage/transport devices for the carrier sheet, and process tools capable of continuous processing of the carrier sheets.
    Type: Application
    Filed: September 28, 2007
    Publication date: April 2, 2009
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Deepak A. Ramappa, Richard L. Guldi
  • Publication number: 20090017564
    Abstract: The present invention provides a method detecting metal silicide defects in a microelectronic device. The method comprises positioning (110) a portion of a semiconductor substrate in a field of view of an inspection tool. The method also comprises producing (120) a voltage contrast image of the portion, wherein the image is obtained using a collection field that is stronger than an incident field. The method further comprises using (130) the voltage contrast image to determine a metal silicide defect in a microelectronic device. Other aspects of the present invention include an inspection system (200) for detecting metal silicide defects and a method of manufacturing an integrated circuit (300).
    Type: Application
    Filed: September 22, 2008
    Publication date: January 15, 2009
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Deepak A. Ramappa
  • Publication number: 20080299718
    Abstract: A method of forming single or dual damascene interconnect structures using either a via-first or trench first approach includes the steps of providing a substrate surface having an etch-stop layer thereon, a low-k dielectric layer on the etch-stop layer, and a dielectric capping layer on the low-k dielectric layer. In the single damascene process using trench pattern, a trench is etched through the capping layer, the low-k dielectric layer and the etch-stop layer to reach the substrate surface. In the via-first process, using a via pattern, the via is etched through the capping layer, the low-k dielectric layer and the etch-stop layer to reach the substrate surface. In the trench first process, using the via pattern the via is etched through the capping layer, the low-k dielectric layer and the etch-stop layer to reach the substrate surface.
    Type: Application
    Filed: June 1, 2007
    Publication date: December 4, 2008
    Applicant: Texas Instruments Incorporated
    Inventors: Ping Jiang, Deepak A. Ramappa
  • Patent number: 7443189
    Abstract: The present teachings provide methods for detection of metal silicide defects in a microelectronic device. In an exemplary embodiment, a portion of a semiconductor substrate may be positioned in a field of view of an inspection tool. The method also includes producing (120) a voltage contrast image of the portion, wherein the image is obtained using a collection field that is stronger than an incident field. The method also includes using (130) the voltage contrast image to determine a metal silicide defect in a microelectronic device. Other embodiments include an inspection system (200) for detecting metal silicide defects and a method of manufacturing an integrated circuit (300).
    Type: Grant
    Filed: February 2, 2005
    Date of Patent: October 28, 2008
    Assignee: Texas Instruments Incorporated
    Inventor: Deepak A. Ramappa
  • Patent number: 7312151
    Abstract: The present invention provides a system for removing organic contaminants (216) from a copper seed layer that has been deposited on a semiconductor substrate (206). The present invention provides a housing (204) to enclose the semiconductor substrate within. An ultraviolet radiation source (210) is disposed within the housing. A treatment medium (208) is also provided within the housing. The semiconductor substrate is enclosed within the housing and exposed to the treatment medium. The ultraviolet radiation source exposes the semiconductor substrate to ultraviolet radiation, desorbing the contaminants from the seed layer.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: December 25, 2007
    Assignee: Texas Instruments Incorporated
    Inventors: Aaron Frank, David Gonzalez, John DeGenova, Srinavas Raghavan, Deepak A. Ramappa
  • Patent number: 7268073
    Abstract: Methods (102) are presented for protecting copper structures (26) from corrosion in the fabrication of semiconductor devices (2), wherein a thin semiconductor or copper-semiconductor alloy corrosion protection layer (30) is formed on an exposed surface (26a) of a copper structure (26) prior to performance of metrology operations (206), so as to inhibit corrosion of the copper structure (26). All or a portion of the corrosion protection layer (30) is then removed (214) in forming an opening in an overlying dielectric (44) in a subsequent interconnect layer.
    Type: Grant
    Filed: November 10, 2004
    Date of Patent: September 11, 2007
    Assignee: Texas Instruments Incorporated
    Inventors: Deepak A. Ramappa, Mona Eissa, Christopher Lyle Borst, Ting Y. Tsui
  • Publication number: 20070197020
    Abstract: A method of detecting interconnect defects in a semiconductor device. The method comprises positioning a portion of a semiconductor substrate, having a plurality of interconnects, in a field of view of an inspection tool. A voltage contrast image of the portion is produced. The voltage contrast image is obtained using a collection field that is at least about 1 percent different than an incident field. The method further comprises using the voltage contrast image to determine defective ones of the interconnects.
    Type: Application
    Filed: February 17, 2006
    Publication date: August 23, 2007
    Applicant: Texas Instruments Inc.
    Inventor: Deepak Ramappa
  • Publication number: 20070141829
    Abstract: The invention provides a method of fabricating a semiconductive device [200]. In this embodiment, the method comprises depositing a hydrocarbon layer [294] over a semiconductive substrate, forming an interconnect structure [295, 297] within the hydrocarbon layer [294], and removing the hydrocarbon layer [294] by sublimation.
    Type: Application
    Filed: December 20, 2005
    Publication date: June 21, 2007
    Applicant: Texas Instruments, Incorporated
    Inventors: Deepak Ramappa, Richard Guldi, Asad Haider, Frank Poag
  • Patent number: 7228193
    Abstract: Semiconductor devices formed on wafers are inspected using a master wafer. A subject wafer of a semiconductor design is provided. The subject wafer has dies wherein semiconductor devices of the semiconductor design are formed and at a stage of fabrication. A current layer of the subject wafer is scanned to obtain a scanned layer/image. A master wafer comprising individual wafer/layer maps is obtained. The scanned layer is compared with a corresponding layer map. Matching and non-matching defects are identified from repetitive defects within the corresponding layer map and defects within the scanned layer. The matching defects are reviewed to classify and or identify causality. The master wafer is then updated.
    Type: Grant
    Filed: August 15, 2005
    Date of Patent: June 5, 2007
    Assignee: Texas Instruments Incorporated
    Inventors: Richard L. Guldi, Jae H. Park, Deepak A. Ramappa
  • Patent number: 7200498
    Abstract: The present invention defines a system (100) for detecting copper contamination within a semiconductor manufacturing process. According to the present invention, a semiconductor wafer (102) is transferred (108) from a semiconductor manufacturing component (104), which may have exposed the wafer to copper contamination, to a measurement system (106). The measurement system measures an electrical value at a plurality of locations along a surface of the wafer, prior to and after exposure of the surface to an activation system (112). The activation system is provided to cause any copper contamination along the surface to form a precipitate thereon. An analysis component (110) is provided to receive electrical value and location information from the measurement system and to identify, from the measurements, the presence and location of copper contamination along the semiconductor wafer surface.
    Type: Grant
    Filed: May 26, 2004
    Date of Patent: April 3, 2007
    Assignee: Texas Instruments Incorporated
    Inventor: Deepak A. Ramappa
  • Publication number: 20070038325
    Abstract: Semiconductor devices formed on wafers are inspected using a master wafer. A subject wafer of a semiconductor design is provided. The subject wafer has dies wherein semiconductor devices of the semiconductor design are formed and at a stage of fabrication. A current layer of the subject wafer is scanned to obtain a scanned layer/image. A master wafer comprising individual wafer/layer maps is obtained. The scanned layer is compared with a corresponding layer map. Matching and non-matching defects are identified from repetitive defects within the corresponding layer map and defects within the scanned layer. The matching defects are reviewed to classify and or identify causality. The master wafer is then updated.
    Type: Application
    Filed: August 15, 2005
    Publication date: February 15, 2007
    Inventors: Richard Guldi, Jae Park, Deepak Ramappa
  • Patent number: 7112540
    Abstract: The present invention provides an electroplating process and a method for manufacturing an integrated circuit. The electroplating process includes, among other steps, placing a substrate 290 in an enclosure 200 being substantially devoid of unwanted contaminants and forming a material layer 310 over the substrate 290 within the enclosure 200, the enclosure 200 still being substantially devoid of the unwanted contaminants. The electroplating process further includes forming a thin layer of oxide 410 over the material layer 310 within the enclosure 200, the enclosure 200 still being substantially devoid of the unwanted contaminants during the forming the thin layer of oxide 410.
    Type: Grant
    Filed: January 28, 2004
    Date of Patent: September 26, 2006
    Assignee: Texas Instruments Incorporated
    Inventors: Richard L. Guldi, Deepak Ramappa