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).
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Patent number: 9293623Abstract: Techniques for manufacturing a device are disclosed. In accordance with one exemplary embodiment, the technique may be realized as a method for forming a solar cell. The method may comprise: implanting p-type dopants into a substrate via a blanket ion implantation process; implanting n-type dopants into the substrate via the blanket ion implantation process; and performing a first annealing process to form the p-type region and performing a second annealing process to form a second n-type region.Type: GrantFiled: October 26, 2012Date of Patent: March 22, 2016Assignee: Varian Semiconductor Equipment Associates, Inc.Inventors: Nicholas P. T. Bateman, Deepak A. Ramappa
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Patent number: 9062367Abstract: A surface of an insulating workpiece is implanted to form either hydrophobic or hydrophilic implanted regions. A conductive coating is deposited on the workpiece. The coating may be a polymer in one instance. This coating preferentially forms either on the implanted regions if these implanted regions are hydrophilic or on the non-implanted regions if the implanted regions are hydrophobic.Type: GrantFiled: September 10, 2012Date of Patent: June 23, 2015Assignee: Varian Semiconductor Equipment Associates, Inc.Inventors: Christopher R. Hatem, Ludovic Godet, Louis Steen, Deepak A. Ramappa
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Patent number: 8937004Abstract: A plasma processing apparatus comprises a plasma source configured to produce a plasma in a plasma chamber, such that the plasma contains ions for implantation into a workpiece. The apparatus also includes a focusing plate arrangement having an aperture arrangement configured to modify a shape of a plasma sheath of the plasma proximate the focusing plate such that ions exiting an aperture of the aperture arrangement define focused ions. The apparatus further includes a processing chamber containing a workpiece spaced from the focusing plate such that a stationary implant region of the focused ions at the workpiece is substantially narrower that the aperture. The apparatus is configured to create a plurality of patterned areas in the workpiece by scanning the workpiece during ion implantation.Type: GrantFiled: April 19, 2013Date of Patent: January 20, 2015Assignee: Varian Semiconductor Equipment Associates, Inc.Inventors: Anthony Renau, Ludovic Godet, Timothy J. Miller, Joseph C. Olson, Vikram Singh, James Buonodono, Deepak A. Ramappa, Russell J. Low, Atul Gupta, Kevin M. Daniels
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Publication number: 20140273330Abstract: Methods of creating a workpiece having a smooth side and a textured side are disclosed. In some embodiments, a first side of a workpiece is doped, using ion implantation or diffusion, to create a doped layer. This doped layer of the first side may be more resistant to chemical treatment than the second side of the workpiece. This allows the second side of the workpiece to be textured without capping or otherwise protecting the doped first side, even though the doped layer of the first side physically contacts the chemical treatment. In some embodiments, a p-type dopant is used to create the doped layer. In some embodiments, the workpiece is processed to form a solar cell.Type: ApplicationFiled: March 12, 2013Publication date: September 18, 2014Applicant: Varian Semiconductor Equipment Associates, Inc.Inventors: Vikram M. Bhosle, Christopher E. Dube, Deepak A. Ramappa
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Publication number: 20140202633Abstract: A system for processing a substrate includes a plasma chamber to produce a plasma including reactive gas ions at a first pressure, a bias supply to supply a bias between the plasma chamber and the substrate, a plasma sheath modifier disposed between the plasma chamber and substrate, the plasma sheath modifier having an aperture configured to direct the reactive ions toward the substrate in a beam having an ion beam profile, and a process chamber enclosing the substrate, the process chamber at a second pressure different than the first pressure to define a pressure differential.Type: ApplicationFiled: April 11, 2014Publication date: July 24, 2014Inventors: Ludovic Godet, Xianfeng Lu, Deepak A. Ramappa
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Patent number: 8728951Abstract: A method of processing a substrate includes performing a first exposure that comprises generating a plasma containing reactive gas ions in a plasma chamber and generating a bias voltage between the substrate and the plasma chamber. The method also includes providing a plasma sheath modifier having an aperture disposed between the plasma and substrate and operable to direct the reactive gas ions toward the substrate, and establishing a pressure differential between the plasma chamber and substrate region while the reactive gas ions are directed onto the substrate.Type: GrantFiled: July 31, 2012Date of Patent: May 20, 2014Assignee: Varian Semiconductor Equipment Associates, Inc.Inventors: Ludovic Godet, Xianfeng Lu, Deepak A. Ramappa
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Patent number: 8716155Abstract: Methods of improving charge trapping are disclosed. One such method includes forming an oxide-nitride-oxide tunnel stack and a silicon nitride layer on the oxide-nitride-oxide tunnel stack. This silicon nitride layer is implanted with ions. These ions may function as electron traps or as fields. The silicon nitride layer may be part of a flash memory device.Type: GrantFiled: September 11, 2012Date of Patent: May 6, 2014Assignee: Varian Semiconductor Equipment Associates, Inc.Inventors: Deepak A. Ramappa, Kyu-Ha Shim
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Publication number: 20140120647Abstract: Techniques for manufacturing a device are disclosed. In accordance with one exemplary embodiment, the technique may be realized as a method for forming a solar cell. The method may comprise: implanting p-type dopants into a substrate via a blanket ion implantation process; implanting n-type dopants into the substrate via the blanket ion implantation process; and performing a first annealing process to form the p-type region and performing a second annealing process to form a second n-type region.Type: ApplicationFiled: October 26, 2012Publication date: May 1, 2014Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.Inventors: Nicholas P.T. Bateman, Deepak A. Ramappa
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Publication number: 20140038393Abstract: A method of processing a substrate includes performing a first exposure that comprises generating a plasma containing reactive gas ions in a plasma chamber and generating a bias voltage between the substrate and the plasma chamber. The method also includes providing a plasma sheath modifier having an aperture disposed between the plasma and substrate and operable to direct the reactive gas ions toward the substrate, and establishing a pressure differential between the plasma chamber and substrate region while the reactive gas ions are directed onto the substrate.Type: ApplicationFiled: July 31, 2012Publication date: February 6, 2014Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.Inventors: Ludovic Godet, Xianfeng Lu, Deepak A. Ramappa
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Patent number: 8614143Abstract: One embodiment of the present invention relates to a photolithography mask configured to form a metallization and via level utilizing a single lithography and etch process. More particularly, a photolithography mask comprising a mask via shape and one or more metal wire shapes is configured to produce both on-wafer metal lines and via levels. The mask via shape corresponds to an on-wafer photoresist via opening having a first critical dimension (CD). The one or more mask wire shapes correspond to one or more on-wafer photoresist wire openings respectively having a second CD. The first CD is larger than the second CD thereby providing a greater vertical etch rate for ILD exposed by the photoresist via opening than for ILD exposed by the one or more photoresist wire openings. This difference in CD results in a via extending vertically below the metal wire level, thereby making physical contact with underlying metal.Type: GrantFiled: December 3, 2008Date of Patent: December 24, 2013Assignee: Texas Instruments IncorporatedInventors: Makarand R. Kulkarni, Deepak A. Ramappa
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Patent number: 8592230Abstract: A method of patterning a substrate includes providing a focusing plate adjacent to a plasma chamber containing a plasma, the focusing plate configured to extract ions from the plasma through at least one aperture that provides focused ions towards the substrate. The method further includes directing first ions through the at least one aperture to one or more first regions of the substrate so as to condense first gaseous species provided in ambient of the substrate on the one or more first regions of the substrate.Type: GrantFiled: April 21, 2011Date of Patent: November 26, 2013Assignee: Varian Semiconductor Equipment Associates, Inc.Inventors: Deepak A. Ramappa, Ludovic Godet
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Patent number: 8507298Abstract: At least part of a dielectric layer is implanted to form implanted regions. The implanted regions affect the etch rate of the dielectric layer during the formation of the openings through the dielectric layer. Metal contacts may be formed within these openings. The dielectric layer, which may be SiO2 or other materials, may be part of a solar cell or other device.Type: GrantFiled: December 2, 2011Date of Patent: August 13, 2013Assignee: Varian Semiconductor Equipment Associates, Inc.Inventor: Deepak A. Ramappa
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Patent number: 8466039Abstract: A method of cleaving a substrate is disclosed. A species, such as hydrogen or helium, is implanted into a substrate to form a layer of microbubbles. The substrate is then annealed a pressure greater than atmosphere. This annealing may be performed in the presence of the species that was implanted. This diffuses the species into the substrate. The substrate is then cleaved along the layer of microbubbles. Other steps to form an oxide layer or to bond to a handle also may be included.Type: GrantFiled: February 17, 2012Date of Patent: June 18, 2013Assignee: Varian Semiconductor Equipment Associates, Inc.Inventors: Deepak A. Ramappa, Julian G. Blake
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Patent number: 8461030Abstract: A plasma processing apparatus comprises a plasma source configured to produce a plasma in a plasma chamber, such that the plasma contains ions for implantation into a workpiece. The apparatus also includes a focusing plate arrangement having an aperture arrangement configured to modify a shape of a plasma sheath of the plasma proximate the focusing plate such that ions exiting an aperture of the aperture arrangement define focused ions. The apparatus further includes a processing chamber containing a workpiece spaced from the focusing plate such that a stationary implant region of the focused ions at the workpiece is substantially narrower that the aperture. The apparatus is configured to create a plurality of patterned areas in the workpiece by scanning the workpiece during ion implantation.Type: GrantFiled: November 16, 2010Date of Patent: June 11, 2013Assignee: Varian Semiconductor Equipment Associates, Inc.Inventors: Anthony Renau, Ludovic Godet, Timothy J. Miller, Joseph C. Olson, Vikram Singh, James Buonodono, Deepak A. Ramappa, Russell J. Low, Atul Gupta, Kevin M. Daniels
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Publication number: 20130064989Abstract: A surface of an insulating workpiece is implanted to form either hydrophobic or hydrophilic implanted regions. A conductive coating is deposited on the workpiece. The coating may be a polymer in one instance. This coating preferentially forms either on the implanted regions if these implanted regions are hydrophilic or on the non-implanted regions if the implanted regions are hydrophobic.Type: ApplicationFiled: September 10, 2012Publication date: March 14, 2013Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.Inventors: Christopher R. Hatem, Ludovic Godet, Louis Steen, Deepak A. Ramappa
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Patent number: 8187979Abstract: Methods to texture or fabricate workpieces are disclosed. The workpiece may be, for example, a solar cell. This texturing may involve etching or localized sputtering using a plasma where a shape of a boundary between the plasma and the plasma sheath is modified with an insulating modifier. The workpiece may be rotated in between etching or sputtering steps to form pyramids. Regions of the workpiece also may be etched or sputtered with ions formed from a plasma adjusted by an insulating modifier and doped. A metal layer may be formed on these doped regions.Type: GrantFiled: December 23, 2009Date of Patent: May 29, 2012Assignee: Varian Semiconductor Equipment Associates, Inc.Inventors: Deepak A. Ramappa, Ludovic Godet
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Patent number: 8183546Abstract: Ions are generated and directed toward a workpiece. A laser source generates a laser that is projected above the workpiece in a line. As the laser is generated, a fraction of the ions are blocked by the laser. This may enable selective implantation or modification of the workpiece. In one particular embodiment, the lasers are generated while ions are directed toward the workpiece and then stopped. Ions are still directed toward the workpiece after the lasers are stopped.Type: GrantFiled: February 25, 2010Date of Patent: May 22, 2012Assignee: VARIAN Semiconductor Equipment Associates, Inc.Inventor: Deepak A. Ramappa
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Publication number: 20110259408Abstract: A method of patterning a substrate includes providing a focusing plate adjacent to a plasma chamber containing a plasma, the focusing plate configured to extract ions from the plasma through at least one aperture that provides focused ions towards the substrate. The method further includes directing first ions through the at least one aperture to one or more first regions of the substrate so as to condense first gaseous species provided in ambient of the substrate on the one or more first regions of the substrate.Type: ApplicationFiled: April 21, 2011Publication date: October 27, 2011Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.Inventors: Deepak A. Ramappa, Ludovic Godet
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Publication number: 20110204264Abstract: Ions are generated and directed toward a workpiece. A laser source generates a laser that is projected above the workpiece in a line. As the laser is generated, a fraction of the ions are blocked by the laser. This may enable selective implantation or modification of the workpiece. In one particular embodiment, the lasers are generated while ions are directed toward the workpiece and then stopped. Ions are still directed toward the workpiece after the lasers are stopped.Type: ApplicationFiled: February 25, 2010Publication date: August 25, 2011Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.Inventor: Deepak A. RAMAPPA
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Publication number: 20110151610Abstract: Methods to texture or fabricate workpieces are disclosed. The workpiece may be, for example, a solar cell. This texturing may involve etching or localized sputtering using a plasma where a shape of a boundary between the plasma and the plasma sheath is modified with an insulating modifier. The workpiece may be rotated in between etching or sputtering steps to form pyramids. Regions of the workpiece also may be etched or sputtered with ions formed from a plasma adjusted by an insulating modifier and doped. A metal layer may be formed on these doped regions.Type: ApplicationFiled: December 23, 2009Publication date: June 23, 2011Applicant: VARIAN SEMICONDUCTOR EQUIPMENT ASSOCIATES, INC.Inventors: Deepak A. RAMAPPA, Ludovic Godet