Patents by Inventor Solomon Assefa

Solomon Assefa 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: 9484367
    Abstract: A method of forming an integrated photonic semiconductor structure having a photodetector device and a CMOS device may include depositing a dielectric stack over the photodetector device such that the dielectric stack encapsulates the photodetector. An opening is etched into the dielectric stack down to an upper surface of a region of an active area of the photodetector. A first metal layer is deposited directly onto the upper surface of the region of the active area via the opening such that the first metal layer may cover the region of the active area. Within the same mask level, a plurality of contacts including a second metal layer are located on the first metal layer and on the CMOS device. The first metal layer isolates the active area from the occurrence of metal intermixing between the second metal layer and the active area of the photodetector.
    Type: Grant
    Filed: March 27, 2014
    Date of Patent: November 1, 2016
    Assignee: GLOBALFOUNDRIES INC.
    Inventors: Solomon Assefa, Jeffrey P. Gambino, Steven M. Shank
  • Patent number: 9466740
    Abstract: An encapsulated integrated photodetector waveguide structures with alignment tolerance and methods of manufacture are disclosed. The method includes forming a waveguide structure bounded by one or more shallow trench isolation (STI) structure(s). The method further includes forming a photodetector fully landed on the waveguide structure.
    Type: Grant
    Filed: December 9, 2015
    Date of Patent: October 11, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Solomon Assefa, Bruce W. Porth, Steven M. Shank
  • Publication number: 20160260849
    Abstract: An encapsulated integrated photodetector waveguide structures with alignment tolerance and methods of manufacture are disclosed. The method includes forming a waveguide structure bounded by one or more shallow trench isolation (STI) structure(s). The method further includes forming a photodetector fully landed on the waveguide structure.
    Type: Application
    Filed: May 16, 2016
    Publication date: September 8, 2016
    Inventors: Solomon Assefa, Bruce W. Porth, Steven M. Shank
  • Publication number: 20160247944
    Abstract: Approaches for silicon photonics integration are provided. A method includes: forming at least one encapsulating layer over and around a photodetector; thermally crystallizing the photodetector material after the forming the at least one encapsulating layer; and after the thermally crystallizing the photodetector material, forming a conformal sealing layer on the at least one encapsulating layer and over at least one device. The conformal sealing layer is configured to seal a crack in the at least one encapsulating layer. The photodetector and the at least one device are on a same substrate. The at least one device includes a complementary metal oxide semiconductor device or a passive photonics device.
    Type: Application
    Filed: April 29, 2016
    Publication date: August 25, 2016
    Inventors: Solomon Assefa, Tymon Barwicz, William M. Green, Marwan H. Khater, Jessie C. Rosenberg, Steven M. Shank
  • Patent number: 9423582
    Abstract: An encapsulated integrated photodetector waveguide structures with alignment tolerance and methods of manufacture are disclosed. The method includes forming a waveguide structure bounded by one or more shallow trench isolation (STI) structure(s). The method further includes forming a photodetector fully landed on the waveguide structure.
    Type: Grant
    Filed: August 24, 2015
    Date of Patent: August 23, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Solomon Assefa, Bruce W. Porth, Steven M. Shank
  • Publication number: 20160231171
    Abstract: The present invention discloses a spectrometer apparatus comprising a mobile device including an integrated camera, having a camera lens and an image sensor. The camera lens is located within a body of the mobile device that comprises a detachable housing coupled to the body of the mobile device. The detachable housing includes a first end and a second end opposed to the first end. The first end includes an optical input and the second end includes an opening that is substantially aligned with the camera lens. An optical spectrometer device is located within the housing and optically coupled to both the optical input at the first end of the housing and the camera lens at the second end of the housing. The optical spectrometer device receives a target image from the optical input and generates a spectral image that is received by the image sensor via the camera lens.
    Type: Application
    Filed: February 5, 2015
    Publication date: August 11, 2016
    Inventors: Solomon Assefa, Sergio A. Bermudez Rodriguez, Levente Klein, Theodore G. van Kessel
  • Publication number: 20160181445
    Abstract: Approaches for silicon photonics integration are provided. A method includes: forming at least one encapsulating layer over and around a photodetector; thermally crystallizing the photodetector material after the forming the at least one encapsulating layer; and after the thermally crystallizing the photodetector material, forming a conformal sealing layer on the at least one encapsulating layer and over at least one device. The conformal sealing layer is configured to seal a crack in the at least one encapsulating layer. The photodetector and the at least one device are on a same substrate. The at least one device includes a complementary metal oxide semiconductor device or a passive photonics device.
    Type: Application
    Filed: December 23, 2014
    Publication date: June 23, 2016
    Inventors: Solomon Assefa, Tymon Barwicz, William M. Green, Marwan H. Khater, Jessie C. Rosenberg, Steven M. Shank
  • Patent number: 9368653
    Abstract: Approaches for silicon photonics integration are provided. A method includes: forming at least one encapsulating layer over and around a photodetector; thermally crystallizing the photodetector material after the forming the at least one encapsulating layer; and after the thermally crystallizing the photodetector material, forming a conformal sealing layer on the at least one encapsulating layer and over at least one device. The conformal sealing layer is configured to seal a crack in the at least one encapsulating layer. The photodetector and the at least one device are on a same substrate. The at least one device includes a complementary metal oxide semiconductor device or a passive photonics device.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: June 14, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Solomon Assefa, Tymon Barwicz, William M. Green, Marwan H. Khater, Jessie C. Rosenberg, Steven M. Shank
  • Patent number: 9356164
    Abstract: An encapsulated integrated photodetector waveguide structures with alignment tolerance and methods of manufacture are disclosed. The method includes forming a waveguide structure bounded by one or more shallow trench isolation (STI) structure(s). The method further includes forming a photodetector fully landed on the waveguide structure.
    Type: Grant
    Filed: August 24, 2015
    Date of Patent: May 31, 2016
    Assignee: International Business Machines Corporation
    Inventors: Solomon Assefa, Bruce W. Porth, Steven M. Shank
  • Publication number: 20160085039
    Abstract: An encapsulated integrated photodetector waveguide structures with alignment tolerance and methods of manufacture are disclosed. The method includes forming a waveguide structure bounded by one or more shallow trench isolation (STI) structure(s). The method further includes forming a photodetector fully landed on the waveguide structure.
    Type: Application
    Filed: December 9, 2015
    Publication date: March 24, 2016
    Inventors: Solomon Assefa, Bruce W. Porth, Steven M. Shank
  • Patent number: 9234854
    Abstract: A method of determining a parameter of a wafer is disclosed. Light is propagated through a waveguide disposed in the wafer. A first measurement of optical power is obtained at a first optical tap coupled to the waveguide and a second measurement of optical power is obtained at a second optical tap coupled to the waveguide using a photodetector placed at a selected location with respect to the wafer. A difference in optical power is determined between the first optical tap and the second optical tap from the first measurement and the second measurement. The parameter of the wafer is determined from the determined difference in optical power.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: January 12, 2016
    Assignee: International Business Machines Corporation
    Inventors: Solomon Assefa, Douglas M. Gill, Jessie C. Rosenberg
  • Patent number: 9236287
    Abstract: Photonic SOI devices are formed by lateral epitaxy of a deposited non-crystalline semiconductor layer over a localized buried oxide created by a trench isolation process or by thermal oxidation. Specifically, and after forming a trench into a semiconductor substrate, the trench can be filled with an oxide by a deposition process or a thermal oxidation can be performed to form a localized buried oxide within the semiconductor substrate. In some embodiments, the oxide can be recessed to expose sidewall surfaces of the semiconductor substrate. Next, a non-crystalline semiconductor layer is formed and then a solid state crystallization is preformed which forms a localized semiconductor-on-insulator layer. During the solid state crystallization process portions of the non-crystalline semiconductor layer that are adjacent exposed sidewall surfaces of the substrate are crystallized.
    Type: Grant
    Filed: November 2, 2012
    Date of Patent: January 12, 2016
    Assignee: GLOBALFOUNDIES INC.
    Inventors: Solomon Assefa, William M. Green, Marwan H. Khater, Yurii A. Vlasov
  • Patent number: 9231131
    Abstract: An encapsulated integrated photodetector waveguide structures with alignment tolerance and methods of manufacture are disclosed. The method includes forming a waveguide structure bounded by one or more shallow trench isolation (STI) structure(s). The method further includes forming a photodetector fully landed on the waveguide structure.
    Type: Grant
    Filed: January 7, 2014
    Date of Patent: January 5, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Solomon Assefa, Bruce W. Porth, Steven M. Shank
  • Patent number: 9229164
    Abstract: A method of forming an integrated photonic semiconductor structure having a photodetector and a CMOS device may include forming the CMOS device on a first silicon-on-insulator region, forming a silicon optical waveguide on a second silicon-on-insulator region, and forming a shallow trench isolation (STI) region surrounding the silicon optical waveguide such that the shallow trench isolation electrically isolates the first and second silicon-on-insulator region. Within the STI region, a germanium material is deposited adjacent an end facet of the semiconductor optical waveguide. The germanium material forms an active region that receives propagating optical signals from the end facet of the semiconductor optical waveguide.
    Type: Grant
    Filed: April 23, 2013
    Date of Patent: January 5, 2016
    Assignee: GLOBALFOUNDRIES INC.
    Inventors: Solomon Assefa, William M. Green, Steven M. Shank, Yurii A. Vlasov
  • Publication number: 20150364620
    Abstract: An encapsulated integrated photodetector waveguide structures with alignment tolerance and methods of manufacture are disclosed. The method includes forming a waveguide structure bounded by one or more shallow trench isolation (STI) structure(s). The method further includes forming a photodetector fully landed on the waveguide structure.
    Type: Application
    Filed: August 24, 2015
    Publication date: December 17, 2015
    Inventors: Solomon Assefa, Bruce W. Porth, Steven M. Shank
  • Publication number: 20150364619
    Abstract: An encapsulated integrated photodetector waveguide structures with alignment tolerance and methods of manufacture are disclosed. The method includes forming a waveguide structure bounded by one or more shallow trench isolation (STI) structure(s). The method further includes forming a photodetector fully landed on the waveguide structure.
    Type: Application
    Filed: August 24, 2015
    Publication date: December 17, 2015
    Inventors: Solomon Assefa, Bruce W. Porth, Steven M. Shank
  • Publication number: 20150364636
    Abstract: An encapsulated integrated photodetector waveguide structures with alignment tolerance and methods of manufacture are disclosed. The method includes forming a waveguide structure bounded by one or more shallow trench isolation (STI) structure(s). The method further includes forming a photodetector fully landed on the waveguide structure.
    Type: Application
    Filed: August 24, 2015
    Publication date: December 17, 2015
    Inventors: Solomon Assefa, Bruce W. Porth, Steven M. Shank
  • Publication number: 20150348827
    Abstract: Photonic devices are created by laterally growing a semiconductor material (i.e., a localized semiconductor-on-insulator layer) over a localized buried oxide (BOX) created in a semiconductor by either a trench isolation process or thermal oxidation. In one embodiment, and after trench formation in a semiconductor substrate, the trench is filled with oxide to create a localized BOX. The top surface of the BOX is recessed to depth below the topmost surface of the semiconductor substrate to expose sidewall surfaces of the semiconductor substrate within each trench. A semiconductor material is then epitaxially grown from the exposed sidewall surfaces of the semiconductor substrate.
    Type: Application
    Filed: August 10, 2015
    Publication date: December 3, 2015
    Inventors: Solomon Assefa, William M. Green, Marwan H. Khater, Yurri A. Vlasov
  • Publication number: 20150303229
    Abstract: A method of protecting a CMOS device within an integrated photonic semiconductor structure is provided. The method may include depositing a conformal layer of germanium over the CMOS device and an adjacent area to the CMOS device, depositing a conformal layer of dielectric hardmask over the germanium, and forming, using a mask level, a patterned layer of photoresist for covering the CMOS device and a photonic device formation region within the adjacent area. Openings are etched into areas of the deposited layer of silicon nitride not covered by the patterned photoresist, such that the areas are adjacent to the photonic device formation region. The germanium material is then etched from the conformal layer of germanium at a location underlying the etched openings for forming the photonic device at the photonic device formation region. The conformal layer of germanium deposited over the CMOS device protects the CMOS device.
    Type: Application
    Filed: June 8, 2015
    Publication date: October 22, 2015
    Inventors: Solomon Assefa, Marwan H. Khater, Edward W. Kiewra, Carol Reinholm, Steven M. Shank
  • Publication number: 20150268417
    Abstract: A method of forming an integrated photonic semiconductor structure having a photodetector and a CMOS device may include forming the CMOS device on a first silicon-on-insulator region, forming a silicon optical waveguide on a second silicon-on-insulator region, and forming a shallow trench isolation (STI) region surrounding the silicon optical waveguide such that the shallow trench isolation electrically isolating the first and second silicon-on-insulator region. Within a first region of the STI region, a first germanium material is deposited adjacent a first side wall of the semiconductor optical waveguide. Within a second region of the STI region, a second germanium material is deposited adjacent a second side wall of the semiconductor optical waveguide, whereby the second side wall opposes the first side wall. The first and second germanium material form an active region that evanescently receives propagating optical signals from the first and second side wall of the semiconductor optical waveguide.
    Type: Application
    Filed: April 23, 2015
    Publication date: September 24, 2015
    Inventors: SOLOMON ASSEFA, WILLIAM M. GREEN, STEVEN M. SHANK, YURII A. VLASOV