Patents Assigned to Cermet, Inc.
-
Patent number: 7525128Abstract: A light-emitting zinc oxide based compound semiconductor device of a double-heterostructure. The double-heterostructure includes a light-emitting layer formed of a low-resistivity Mg1?x?yCdxZnyO; 0?x<1, 0<y?1, and x+y=0.1 to 1 compound semiconductor doped with p-type and/or n-type impurity. A first clad layer is joined to one surface of the light-emitting layer and formed of an n-type zinc oxide compound semiconductor having a composition different from the light-emitting layer. A second clad layer is joined to another surface of the light-emitting layer and formed of a low-resistivity, p-type zinc oxide based semiconductor having a composition different from the light-emitting layer.Type: GrantFiled: December 29, 2006Date of Patent: April 28, 2009Assignee: Cermet, Inc.Inventors: Jeffrey E. Nause, Shanthi Ganesan
-
Publication number: 20070126015Abstract: A semi-insulating zinc-oxide (ZnO) single crystal. The crystal has resistivity of at least 1.5×103 ohm-centimeter (?-cm). The ZnO crystal can be produced from a melt contained by solid-phase ZnO to prevent introduction of undesired impurities into the crystal. The crystal can be a bulk single crystal that is cut and processed into wafer form of specified thickness. A dopant in a concentration ranging from 1×1015 atoms per cubic centimeter (atoms/cc) to 5×1021 atoms/cc can increase resistivity of the crystal relative to intrinsic ZnO. The dopant can be lithium (Li), sodium (Na), copper (Cu), nitrogen (N), phosphorus (P), and/or manganese (Mn).Type: ApplicationFiled: February 6, 2007Publication date: June 7, 2007Applicant: Cermet, Inc.Inventors: Jeff Nause, William Nemeth
-
Publication number: 20070111372Abstract: A disclosed method deposits a p-type magnesium-, cadmium- and/or zinc-oxide-based II-VI Group compound semiconductor crystal layer on a zinc oxide (ZnO) substrate having a (002) crystallographic orientation. The method uses a zinc-containing reaction gas supplied to a surface of a heated substrate. The p-type magnesium-, cadmium- and/or zinc-oxide-based II-VI Group compound semiconductor crystal layer is grown on the heated substrate, while introducing a pressing gas in a transverse direction toward the substrate to press the reaction gas against the entire surface of the substrate.Type: ApplicationFiled: December 28, 2006Publication date: May 17, 2007Applicant: CERMET, INC.Inventors: Jeffrey Nause, Joseph Maciejewski, Vincente Munne, Shanthi Ganesan
-
Publication number: 20070102723Abstract: A light-emitting zinc oxide based compound semiconductor device of a double-heterostructure. The double-heterostructure includes a light-emitting layer formed of a low-resistivity Mg1-x-yCdxZnyO; 0?x<1, 0<y?1, and x+y=0.1 to 1 compound semiconductor doped with p-type and/or n-type impurity. A first clad layer is joined to one surface of the light-emitting layer and formed of an n-type zinc oxide compound semiconductor having a composition different from the light-emitting layer. A second clad layer is joined to another surface of the light-emitting layer and formed of a low-resistivity, p-type zinc oxide based semiconductor having a composition different from the light-emitting layer.Type: ApplicationFiled: December 29, 2006Publication date: May 10, 2007Applicant: CERMET, INC.Inventors: Jeff Nause, Shanthi Ganesan
-
Patent number: 7176054Abstract: A method of depositing a p-type magnesium-, cadmium- and/or zinc-oxide-based II-VI Group compound semiconductor crystal layer over a substrate by a metalorganic chemical vapor deposition technique. A reaction gas is supplied to a surface of a heated substrate in a direction parallel or oblique to the substrate. The p-type magnesium-, cadmium- and/or zinc-oxide-based II-VI Group compound semiconductor crystal layer is grown on the heated substrate, while introducing a pressing gas substantially in a vertical direction toward the substrate to press the reaction gas against the entire surface of the substrate.Type: GrantFiled: July 20, 2004Date of Patent: February 13, 2007Assignee: Cermet, Inc.Inventors: Jeffrey E. Nause, Joseph Owen Maciejewski, Vincente Munne, Shanthi Ganesan
-
Patent number: 7105868Abstract: A zinc oxide (ZnO) field effect transistor exhibits large input amplitude by using a gate insulating layer. A channel layer and the gate insulating layer are sequentially laminated on a substrate. A gate electrode is formed on the gate insulating layer. A source contact and a drain contact are disposed at the both sides of the gate contact and are electrically connected to the channel layer via openings. The channel layer is formed from n-type ZnO. The gate insulating layer is made from aluminum nitride/aluminum gallium nitride (AlN/AlGaN) or magnesium zinc oxide (MgZnO), which exhibits excellent insulation characteristics, thus increasing the Schottky barrier and achieving large input amplitude. If the FET is operated in the enhancement mode, it is operable in a manner similar to a silicon metal oxide semiconductor field effect transistor (Si-MOS-type FET), resulting in the formation of an inversion layer.Type: GrantFiled: June 24, 2003Date of Patent: September 12, 2006Assignee: Cermet, Inc.Inventors: Jeff Nause, Shanthi Ganesan
-
Publication number: 20060049425Abstract: A light-emitting zinc oxide based compound semiconductor device of a double-heterostructure. The double-heterostructure includes a light-emitting layer formed of a low-resistivity Mg1-x-y Cdx Zny O; 0?x<1, 0<y?1, and x+y=0.1 to 1 compound semiconductor doped with p-type and/or n-type impurity. A first clad layer is joined to one surface of the light-emitting layer and formed of an n-type zinc oxide compound semiconductor having a composition different from the light-emitting layer. A second clad layer is joined to another surface of the light-emitting layer and formed of a low-resistivity, p-type zinc oxide based semiconductor having a composition different from the light-emitting layer.Type: ApplicationFiled: May 13, 2005Publication date: March 9, 2006Applicant: Cermet, Inc.Inventors: Jeff Nause, Shanthi Ganesan
-
Patent number: 6936101Abstract: A semi-insulating zinc-oxide (ZnO) single crystal. The crystal has resistivity of at least 1.5×103 ohm-centimeter (?-cm). The ZnO crystal can be produced from a melt contained by solid-phase ZnO to prevent introduction of undesired impurities into the crystal. The crystal can be a bulk single crystal that is cut and processed into wafer form of specified thickness. A dopant in a concentration ranging from 1×1015 atoms per cubic centimeter (atoms/cc) to 5×1021 atoms/cc can increase resistivity of the crystal relative to intrinsic ZnO. The dopant can be lithium (Li), sodium (Na), copper (Cu), nitrogen (N), phosphorus (P), and/or manganese (Mn).Type: GrantFiled: June 23, 2003Date of Patent: August 30, 2005Assignee: Cermet, Inc.Inventors: Jeff Nause, William Michael Nemeth
-
Patent number: 6887736Abstract: A method of depositing a p-type magnesium-, cadmium- and/or zinc-oxide-based II-VI Group compound semiconductor crystal layer over a substrate by a metalorganic chemical vapor deposition technique. A reaction gas is supplied to a surface of a heated substrate in a direction parallel or oblique to the substrate. The p-type magnesium-, cadmium- and/or zinc-oxide-based II-VI Group compound semiconductor crystal layer is grown on the heated substrate, while introducing a pressing gas substantially in a vertical direction toward the substrate to press the reaction gas against the entire surface of the substrate.Type: GrantFiled: April 23, 2003Date of Patent: May 3, 2005Assignee: Cermet, Inc.Inventors: Jeffrey E. Nause, Joseph Owen Maciejewski, Vincente Munne, Shanthi Ganesan
-
Publication number: 20040058463Abstract: A method of depositing a p-type magnesium-, cadmium- and/or zinc-oxide-based II-VI Group compound semiconductor crystal layer over a substrate by a metalorganic chemical vapor deposition technique. A reaction gas is supplied to a surface of a heated substrate in a direction parallel or oblique to the substrate. The p-type magnesium-, cadmium- and/or zinc-oxide-based II-VI Group compound semiconductor crystal layer is grown on the heated substrate, while introducing a pressing gas substantially in a vertical direction toward the substrate to press the reaction gas against the entire surface of the substrate.Type: ApplicationFiled: April 23, 2003Publication date: March 25, 2004Applicant: Cermet, Inc.Inventors: Jeffrey E. Nause, Joseph Owen Maciejewski, Vincente Munne, Shanthi Ganesan
-
Publication number: 20040056273Abstract: A zinc oxide (ZnO) field effect transistor exhibits large input amplitude by using a gate insulating film. A channel layer and a gate insulating film are sequentially n laminated on a substrate. A gate electrode is formed on the gate insulating film. A source electrode and a drain electrode are disposed at the both sides of the gate electrode and are electrically connected to the channel layer via openings. The channel layer is formed from n-type ZnO. The gate insulating film is made from aluminum nitride/aluminum gallium nitride (AlN/AlGaN) or magnesium zinc oxide (MgZnO), which exhibits excellent insulation characteristics, thus increasing the Schottky barrier and achieving large input amplitude. If the FET is operated in the enhancement mode, it is operable in a manner similar to a silicon metal oxide semiconductor field effect transistor (Si-MOS-type FET), resulting in the formation of an inversion layer.Type: ApplicationFiled: June 24, 2003Publication date: March 25, 2004Applicant: Cermet, Inc.Inventors: Jeff Nause, Shanthi Ganesan
-
Publication number: 20040055526Abstract: A semi-insulating zinc-oxide (ZnO) single crystal. The crystal has resistivity of at least 1.5×103 ohm-centimeter (&OHgr;-cm). The ZnO crystal can be produced from a melt contained by solid-phase ZnO to prevent introduction of undesired impurities into the crystal. The crystal can be a bulk single crystal that is cut and processed into wafer form of specified thickness. A dopant in a concentration ranging from 1×1015 atoms per cubic centimeter (atoms/cc) to 5×1021 atoms/cc can increase resistivity of the crystal relative to intrinsic ZnO. The dopant can be lithium (Li), sodium (Na), copper (Cu), nitrogen (N), phosphorus (P), and/or manganese (Mn).Type: ApplicationFiled: June 23, 2003Publication date: March 25, 2004Applicant: Cermet, Inc.Inventors: Jeff Nause, William Michael Nemeth
-
Patent number: 5900060Abstract: The invention is directed to an apparatus, system and methods for growing high-purity crystals of substances that are peritectic at atmospheric pressure. The apparatus includes a pressure vessel that contains a pressurized gas. The apparatus also includes a cooling unit that is situated in the pressure vessel. The cooling unit receives a coolant flow from outside of the vessel, and has cooled surfaces that define an enclosure that receives the charge material. The apparatus further includes an inductive heating element situated in the vessel, that is coupled to receive electric power externally to the vessel. The element heats the interior portion of the charge material to form a molten interior portion contained by a relatively cool, exterior solid-phase portion of the charge material that is closer relative to the molten interior, to the cooled surfaces of the cooling unit.Type: GrantFiled: July 3, 1996Date of Patent: May 4, 1999Assignee: Cermet, Inc.Inventors: Jeffrey E. Nause, D. Norman Hill, Stephen G. Pope
-
Patent number: 5863326Abstract: The invention is directed to an apparatus, system and methods for growing high-purity crystals of substances that are peritectic at atmospheric pressure using the Czochralski technique. The apparatus includes a pressure vessel that contains a pressurized gas. The apparatus also includes a cooling unit that is situated in the pressure vessel. The cooling unit receives a coolant flow from outside of the vessel, and has cooled surfaces that define an enclosure that receives the charge material. The apparatus further includes an inductive heating element situated in the vessel, that is coupled to receive electric power externally to the vessel. The element heats the interior portion of the charge material to form a molten interior portion contained by a relatively cool, exterior solid-phase portion of the charge material that is closer relative to the molten interior, to the cooled surfaces of the cooling unit.Type: GrantFiled: March 14, 1997Date of Patent: January 26, 1999Assignee: Cermet, Inc.Inventors: Jeffrey E. Nause, D. Norman Hill, Stephen G. Pope