Patents by Inventor Pratik P. Joshi

Pratik P. Joshi 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: 8853856
    Abstract: The present disclosure relates to a structure comprising 1. an electrically conductive substrate having carbon nanotubes grown thereon; 2. a cured polymeric fill matrix comprising at least one latent photoacid generator embedded around the carbon nanotubes but allowing tips of the carbon nanotubes to be exposed; 3. a layer of patterned and cured photosensitive dielectric material on the cured polymeric fill matrix, wherein tips of the carbon nanotubes are exposed within the patterns; and 4. an electrically conductive material filled into the interconnect pattern and in contact with the exposed tips of the carbon nanotubes; and to methods of making the structure and using the structure to measure the electrical characteristics of carbon nanotubes.
    Type: Grant
    Filed: June 22, 2010
    Date of Patent: October 7, 2014
    Assignee: International Business Machines Corporation
    Inventors: Maxime Darnon, Gerald W. Gibson, Pratik P. Joshi, Qinghuang Lin
  • Patent number: 8828749
    Abstract: The present disclosure relates to a structure comprising 1. an electrically conductive substrate having carbon nanotubes grown thereon; 2. a cured polymeric fill matrix comprising at least one latent photoacid generator embedded around the carbon nanotubes but allowing tips of the carbon nanotubes to be exposed; 3. a layer of patterned and cured photosensitive dielectric material on the cured polymeric fill matrix, wherein tips of the carbon nanotubes are exposed within the patterns; and 4. an electrically conductive material filled into the interconnect pattern and in contact with the exposed tips of the carbon nanotubes; and to methods of making the structure and using the structure to measure the electrical characteristics of carbon nanotubes.
    Type: Grant
    Filed: August 8, 2012
    Date of Patent: September 9, 2014
    Assignee: International Business Machines Corporation
    Inventors: Maxime Darnon, Gerald W. Gibson, Pratik P. Joshi, Qinghuang Lin
  • Patent number: 8475667
    Abstract: The present disclosure relates to a method of patterning a photosensitive material on a polymeric fill matrix comprising at least one latent photoacid generator; and a structure prepared according to said method. The method comprises: a. depositing a polymeric fill matrix comprising at least one latent photoacid generator; b. curing the polymeric fill matrix; c. depositing a layer of photosensitive material directly onto the cured polymeric fill matrix; and d. forming a pattern with at least one opening in the layer of photosensitive material with lithography.
    Type: Grant
    Filed: June 22, 2010
    Date of Patent: July 2, 2013
    Assignee: International Business Machines Corporation
    Inventors: Maxime Darnon, Pratik P. Joshi, Qinghuang Lin
  • Publication number: 20130143397
    Abstract: An organic planarizing layer (OPL) is formed atop a semiconductor substrate which includes a plurality of gate lines thereon. Each gate line includes at least a high k gate dielectric and a metal gate. A patterned photoresist having at least one pattern formed therein is then positioned atop the OPL. The at least one pattern in the photoresist is perpendicular to each of the gate lines. The pattern is then transferred by etching into the OPL and portions of each of the underlying gate lines to provide a plurality of gate stacks each including at least a high k gate dielectric portion and a metal gate portion. The patterned photoresist and the remaining OPL layer are then removed utilizing a sequence of steps including first contacting with a first acid, second contacting with an aqueous cerium-containing solution, and third contacting with a second acid.
    Type: Application
    Filed: September 13, 2012
    Publication date: June 6, 2013
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Nicholas C.M. Fuller, Pratik P. Joshi, Mahmoud Khojasteh, Rajiv M. Ranade, George G. Totir
  • Patent number: 8455366
    Abstract: An organic planarizing layer (OPL) is formed atop a semiconductor substrate which includes a plurality of gate lines thereon. Each gate line includes at least a high k gate dielectric and a metal gate. A patterned photoresist having at least one pattern formed therein is then positioned atop the OPL. The at least one pattern in the photoresist is perpendicular to each of the gate lines. The pattern is then transferred by etching into the OPL and portions of each of the underlying gate lines to provide a plurality of gate stacks each including at least a high k gate dielectric portion and a metal gate portion. The patterned photoresist and the remaining OPL layer are then removed utilizing a sequence of steps including first contacting with a first acid, second contacting with an aqueous cerium-containing solution, and third contacting with a second acid.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: June 4, 2013
    Assignee: International Business Machines Corporation
    Inventors: Nicholas C. M. Fuller, Pratik P. Joshi, Mahmoud Khojasteh, Rajiv M. Ranade, George G. Totir
  • Patent number: 8455292
    Abstract: A method for forming a photodetector device includes forming waveguide feature on a substrate, and forming a photodetector feature including a germanium (Ge) film, the Ge film deposited on the waveguide feature using a plasma enhanced chemical vapor deposition (PECVD) process, the PECVD process having a deposition temperature from about 500° C. to about 550° C., and a deposition pressure from about 666.612 Pa to about 1066.579 Pa.
    Type: Grant
    Filed: September 9, 2011
    Date of Patent: June 4, 2013
    Assignee: International Business Machines Corporation
    Inventors: Solomon Assefa, Pratik P. Joshi, Deborah A. Neumayer
  • Patent number: 8449781
    Abstract: The present disclosure relates to a method for selectively etching-back a polymer matrix to expose tips of carbon nanotubes comprising: a. growing carbon nanotubes on a conductive substrate; b. filling the gap around the carbon nanotubes with a polymeric fill matrix comprising at least one latent photoacid generator; and c. selectively etching-back the polymeric fill matrix to expose tips of the carbon nanotubes.
    Type: Grant
    Filed: June 22, 2010
    Date of Patent: May 28, 2013
    Assignee: International Business Machines Corporation
    Inventors: Maxime Darnon, Gerald W. Gibson, Pratik P. Joshi, Ryan M. Martin, Ying Zhang
  • Publication number: 20130065349
    Abstract: A method for forming a photodetector device includes forming waveguide feature on a substrate, and forming a photodetector feature including a germanium (Ge) film, the Ge film deposited on the waveguide feature using a plasma enhanced chemical vapor deposition (PECVD) process, the PECVD process having a deposition temperature from about 500° C. to about 550° C., and a deposition pressure from about 666.612 Pa to about 1066.579 Pa.
    Type: Application
    Filed: September 9, 2011
    Publication date: March 14, 2013
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Solomon Assefa, Pratik P. Joshi, Deborah A. Neumayer
  • Patent number: 8367556
    Abstract: An organic planarizing layer (OPL) is formed atop a semiconductor substrate which includes a plurality of gate lines thereon. Each gate line includes at least a high k gate dielectric and a metal gate. A patterned photoresist having at least one pattern formed therein is then positioned atop the OPL. The at least one pattern in the photoresist is perpendicular to each of the gate lines. The pattern is then transferred by etching into the OPL and portions of each of the underlying gate lines to provide a plurality of gate stacks each including at least a high k gate dielectric portion and a metal gate portion. The patterned photoresist and the remaining OPL layer are then removed utilizing a sequence of steps including first contacting with a first acid, second contacting with an aqueous cerium-containing solution, and third contacting with a second acid.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: February 5, 2013
    Assignee: International Business Machines Corporation
    Inventors: Nicholas C. M. Fuller, Pratik P. Joshi, Mahmoud Khojasteh, Rajiv M. Ranade, George G. Totir
  • Publication number: 20120301980
    Abstract: The present disclosure relates to a structure comprising 1. an electrically conductive substrate having carbon nanotubes grown thereon; 2. a cured polymeric fill matrix comprising at least one latent photoacid generator embedded around the carbon nanotubes but allowing tips of the carbon nantotubes to be exposed; 3. a layer of patterned and cured photosensitive dielectric material on the cured polymeric fill matrix, wherein tips of the carbon nantobues are exposed within the patterns; and 4. an electrically conductive material filled into the interconnect pattern and in contact with the exposed tips of the carbon nanotubes; and to methods of making the structure and using the structure to measure the electrical characteristics of carbon nanotubes.
    Type: Application
    Filed: August 8, 2012
    Publication date: November 29, 2012
    Applicant: International Business Machines Corporation
    Inventors: Maxime Darnon, Gerald W. Gibson, Pratik P. Joshi, Qinghuang Lin
  • Publication number: 20110309507
    Abstract: The present disclosure relates to a structure comprising 1. an electrically conductive substrate having carbon nanotubes grown thereon; 2. a cured polymeric fill matrix comprising at least one latent photoacid generator embedded around the carbon nanotubes but allowing tips of the carbon nanotubes to be exposed; 3. a layer of patterned and cured photosensitive dielectric material on the cured polymeric fill matrix, wherein tips of the carbon nanotubes are exposed within the patterns; and 4. an electrically conductive material filled into the interconnect pattern and in contact with the exposed tips of the carbon nanotubes; and to methods of making the structure and using the structure to measure the electrical characteristics of carbon nanotubes.
    Type: Application
    Filed: June 22, 2010
    Publication date: December 22, 2011
    Applicant: International Business Machines Corp.
    Inventors: Maxime Darnon, Gerald W. Gibson, Pratik P. Joshi, Qinghuang Lin
  • Publication number: 20110308584
    Abstract: A tunneling layer is provided between a transparent conductive material and a p-doped semiconductor layer of a photovoltaic device. The tunneling layer is comprised of stoichiometric oxides which are formed when an upper surface of the transparent conductive material is subjected to one of the surface modification techniques of this disclosure. The surface modification techniques oxidize the dangling metal bonds of the transparent conductive material. The tunneling layer acts as a protective layer for the transparent conductive material. Moreover, the tunneling layer improves the interface between the transparent conductive material and the p-doped semiconductor layer. The improved interface that exists between the transparent conductive material and the p-doped semiconductor layer results in enhanced properties of the resultant photovoltaic device containing the same. In some embodiments, a high quality single junction solar cell can be provided by this disclosure that has a very well defined interface.
    Type: Application
    Filed: June 16, 2010
    Publication date: December 22, 2011
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Pratik P. Joshi, Young-Hee Kim, Steven E. Steen
  • Publication number: 20110311781
    Abstract: The present disclosure relates to a method of patterning a photosensitive material on a polymeric fill matrix comprising at least one latent photoacid generator; and a structure prepared according to said method. The method comprises: a. depositing a polymeric fill matrix comprising at least one latent photoacid generator; b. curing the polymeric fill matrix; c. depositing a layer of photosensitive material directly onto the cured polymeric fill matrix; and d. forming a pattern with at least one opening in the layer of photosensitive material with lithography.
    Type: Application
    Filed: June 22, 2010
    Publication date: December 22, 2011
    Applicant: International Business Machines Corp.
    Inventors: Maxime Darnon, Pratik P. Joshi, Qinghuang Lin
  • Publication number: 20110308585
    Abstract: A dual transparent conductive material layer is provided between a p-doped semiconductor layer and a substrate layer of a photovoltaic device. The dual transparent conductive material layer includes a first transparent conductive material and a second transparent conductive material wherein the second transparent conductive material is nano-structured. The nano-structured second transparent conductive material acts as a protective layer for the underlying first transparent conductive material. The nano-structured transparent conductive material provides a benefit of a higher Eg of the underlying first transparent conductive material surface and a very high resilience to hydrogen plasma from the nano-structures during the formation of the p-doped semiconductor layer.
    Type: Application
    Filed: June 16, 2010
    Publication date: December 22, 2011
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Pratik P. Joshi, Young-Hee Kim, Steven E. Steen
  • Publication number: 20110311825
    Abstract: The present disclosure relates to a method for selectively etching-back a polymer matrix to expose tips of carbon nanotubes comprising: a. growing carbon nanotubes on a conductive substrate; b. filling the gap around the carbon nanotubes with a polymeric fill matrix comprising at least one latent photoacid generator; and c. selectively etching-back the polymeric fill matrix to expose tips of the carbon nanotubes.
    Type: Application
    Filed: June 22, 2010
    Publication date: December 22, 2011
    Applicant: International Business Machines Corp.
    Inventors: Maxime Darnon, Gerald W. Gibson, Pratik P. Joshi, Ryan M. Martin, Ying Zhang
  • Publication number: 20110308583
    Abstract: Open circuit voltage of a photovoltaic device including a p-i-n junction including amorphous silicon-containing semiconductor materials is increased by a high power plasma treatment on an amorphous p-doped silicon-containing semiconductor layer before depositing an amorphous intrinsic silicon-containing semiconductor layer. The high power plasma treatment deposits a thin layer of nanocrystalline silicon-containing semiconductor material or converts a surface layer of the amorphous p-doped silicon containing layer into a thin nanocrystalline silicon-containing semiconductor layer. After deposition of an intrinsic amorphous silicon layer, the thin nanocrystalline silicon-containing semiconductor layer functions as an interfacial nanocrystalline silicon-containing semiconductor layer located at a p-i junction.
    Type: Application
    Filed: June 16, 2010
    Publication date: December 22, 2011
    Applicant: International Business Machines Corporation
    Inventors: Pratik P. Joshi, Young-Hee Kim
  • Publication number: 20110254138
    Abstract: An improved low-temperature absorber, amorphous carbonitride (ACN) with an extinction coefficient (k) of greater than 0.15, and an emissivity of greater than 0.8 is disclosed. The ACN film can also be characterized as having a minimum of hydrocarbon content as observed by FTIR. The ACN film can be used as an effective absorbing layer that absorbs a wide range of electromagnetic radiation from different sources including lasers or flash lamps. A method of forming such an ACN film at a deposition temperature of less than, or equal to, 450° C. is also provided.
    Type: Application
    Filed: April 15, 2010
    Publication date: October 20, 2011
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Katherina E. Babich, Pratik P. Joshi, Kam Leung Lee, Deborah A. Neumayer, Spyridon Skordas