Patents by Inventor Ralph Krupke
Ralph Krupke 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: 9412815Abstract: A semiconductor device includes a substrate having at least one electrically insulating portion. A first graphene electrode is formed on a surface of the substrate such that the electrically insulating portion is interposed between a bulk portion of the substrate and the first graphene electrode. A second graphene electrode formed on the surface of the substrate. The electrically insulating portion of the substrate is interposed between the bulk portion of the substrate and the second graphene electrode. The second graphene electrode is disposed opposite the first graphene electrode to define an exposed substrate area therebetween.Type: GrantFiled: September 25, 2014Date of Patent: August 9, 2016Assignees: INTERNATIONAL BUSINESS MACHINES CORPORATION, KARLSRUHE INSTITUTE OF TECHNOLOGY, TAIWAN BLUESTONE TECHNOLOGY LTD.Inventors: Phaedon Avouris, Christos Dimitrakopoulos, Damon B. Farmer, Mathias B. Steiner, Michael Engel, Ralph Krupke, Yu-Ming Lin
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Patent number: 8987705Abstract: Carbon nanotubes can be aligned with compatibility with semiconductor manufacturing processes, with scalability for forming smaller devices, and without performance degradation related to structural damages. A planar structure including a buried gate electrode and two embedded electrodes are formed. After forming a gate dielectric, carbon nanotubes are assembled in a solution on a surface of the gate dielectric along the direction of an alternating current (AC) electrical field generated by applying a voltage between the two embedded electrodes. A source contact electrode and a drain contact electrode are formed by depositing a conductive material on both ends of the carbon nanotubes. Each of the source and drain contact electrodes can be electrically shorted to an underlying embedded electrode to reduce parasitic capacitance.Type: GrantFiled: January 9, 2014Date of Patent: March 24, 2015Assignees: International Business Machines Corporation, Karlsruher Institut fuer Technologie (KIT)Inventors: Phaedon Avouris, Yu-ming Lin, Mathias B. Steiner, Michael W. Engel, Ralph Krupke
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Publication number: 20150048312Abstract: A semiconductor device includes a substrate having at least one electrically insulating portion. A first graphene electrode is formed on a surface of the substrate such that the electrically insulating portion is interposed between a bulk portion of the substrate and the first graphene electrode. A second graphene electrode formed on the surface of the substrate. The electrically insulating portion of the substrate is interposed between the bulk portion of the substrate and the second graphene electrode. The second graphene electrode is disposed opposite the first graphene electrode to define an exposed substrate area therebetween.Type: ApplicationFiled: September 25, 2014Publication date: February 19, 2015Inventors: Phaedon Avouris, Christos Dimitrakopoulos, Damon B. Farmer, Mathias B. Steiner, Michael Engel, Ralph Krupke, Yu-Ming Lin
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Patent number: 8859439Abstract: A semiconductor device includes a substrate having at least one electrically insulating portion. A first graphene electrode is formed on a surface of the substrate such that the electrically insulating portion is interposed between a bulk portion of the substrate and the first graphene electrode. A second graphene electrode formed on the surface of the substrate. The electrically insulating portion of the substrate is interposed between the bulk portion of the substrate and the second graphene electrode. The second graphene electrode is disposed opposite the first graphene electrode to define an exposed substrate area therebetween.Type: GrantFiled: March 28, 2013Date of Patent: October 14, 2014Assignees: International Business Machines Corporation, Karlsruhe Institute of Technology, Taiwan Bluestone Technology Ltd.Inventors: Phaedon Avouris, Christos Dimitrakopoulos, Damon B. Farmer, Mathias B. Steiner, Michael Engel, Ralph Krupke, Yu-Ming Lin
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Publication number: 20140291606Abstract: A semiconductor device includes a substrate having at least one electrically insulating portion. A first graphene electrode is formed on a surface of the substrate such that the electrically insulating portion is interposed between a bulk portion of the substrate and the first graphene electrode. A second graphene electrode formed on the surface of the substrate. The electrically insulating portion of the substrate is interposed between the bulk portion of the substrate and the second graphene electrode. The second graphene electrode is disposed opposite the first graphene electrode to define an exposed substrate area therebetween.Type: ApplicationFiled: March 28, 2013Publication date: October 2, 2014Inventors: Phaedon Avouris, Christos Dimitrakopoulos, Damon B. Farmer, Mathias B. Steiner, Michael Engel, Ralph Krupke, Yu-Ming Lin
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Publication number: 20140124736Abstract: Carbon nanotubes can be aligned with compatibility with semiconductor manufacturing processes, with scalability for forming smaller devices, and without performance degradation related to structural damages. A planar structure including a buried gate electrode and two embedded electrodes are formed. After forming a gate dielectric, carbon nanotubes are assembled in a solution on a surface of the gate dielectric along the direction of an alternating current (AC) electrical field generated by applying a voltage between the two embedded electrodes. A source contact electrode and a drain contact electrode are formed by depositing a conductive material on both ends of the carbon nanotubes. Each of the source and drain contact electrodes can be electrically shorted to an underlying embedded electrode to reduce parasitic capacitance.Type: ApplicationFiled: January 9, 2014Publication date: May 8, 2014Applicants: KARLSRUHER INSTITUT FUER TECHNOLOGIE, INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Phaedon Avouris, Yu-ming Lin, Mathias B. Steiner, Michael W. Engel, Ralph Krupke
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Patent number: 8629010Abstract: Carbon nanotubes can be aligned with compatibility with semiconductor manufacturing processes, with scalability for forming smaller devices, and without performance degradation related to structural damages. A planar structure including a buried gate electrode and two embedded electrodes are formed. After forming a gate dielectric, carbon nanotubes are assembled in a solution on a surface of the gate dielectric along the direction of an alternating current (AC) electrical field generated by applying a voltage between the two embedded electrodes. A source contact electrode and a drain contact electrode are formed by depositing a conductive material on both ends of the carbon nanotubes. Each of the source and drain contact electrodes can be electrically shorted to an underlying embedded electrode to reduce parasitic capacitance.Type: GrantFiled: October 21, 2011Date of Patent: January 14, 2014Assignees: International Business Machines Corporation, Karlsruher Institut Fuer Technologie (KIT)Inventors: Phaedon Avouris, Yu-Ming Lin, Mathias B. Steiner, Michael W. Engel, Ralph Krupke
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Patent number: 8610989Abstract: A microcavity-controlled two-dimensional carbon lattice structure device selectively modifies to reflect or to transmit, or emits, or absorbs, electromagnetic radiation depending on the wavelength of the electromagnetic radiation. The microcavity-controlled two-dimensional carbon lattice structure device employs a graphene layer or at least one carbon nanotube located within an optical center of a microcavity defined by a pair of partial mirrors that partially reflect electromagnetic radiation. The spacing between the mirror determines the efficiency of elastic and inelastic scattering of electromagnetic radiation inside the microcavity, and hence, determines a resonance wavelength of electronic radiation that is coupled to the microcavity. The resonance wavelength is tunable by selecting the dimensional and material parameters of the microcavity. The process for manufacturing this device is compatible with standard complementary metal oxide semiconductor (CMOS) manufacturing processes.Type: GrantFiled: October 31, 2011Date of Patent: December 17, 2013Assignees: International Business Machines Corporation, Karlsruher Institut Fuer Technologie (KIT), Cambridge Enterprise LimitedInventors: Phaedon Avouris, Mathias B. Steiner, Michael Engel, Ralph Krupke, Andrea C. Ferrari, Antonio Lombardo
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Publication number: 20130107344Abstract: A microcavity-controlled two-dimensional carbon lattice structure device selectively modifies to reflect or to transmit, or emits, or absorbs, electromagnetic radiation depending on the wavelength of the electromagnetic radiation. The microcavity-controlled two-dimensional carbon lattice structure device employs a graphene layer or at least one carbon nanotube located within an optical center of a microcavity defined by a pair of partial mirrors that partially reflect electromagnetic radiation. The spacing between the mirror determines the efficiency of elastic and inelastic scattering of electromagnetic radiation inside the microcavity, and hence, determines a resonance wavelength of electronic radiation that is coupled to the microcavity. The resonance wavelength is tunable by selecting the dimensional and material parameters of the microcavity. The process for manufacturing this device is compatible with standard complementary metal oxide semiconductor (CMOS) manufacturing processes.Type: ApplicationFiled: October 31, 2011Publication date: May 2, 2013Applicants: International Business Machines Corporation, Karlsruher Institut fuer TechnologieInventors: Phaedon Avouris, Mathias B. Steiner, Michael Engel, Ralph Krupke, Andrea C. Ferrari, Antonio Lombardo
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Publication number: 20130099204Abstract: Carbon nanotubes can be aligned with compatibility with semiconductor manufacturing processes, with scalability for forming smaller devices, and without performance degradation related to structural damages. A planar structure including a buried gate electrode and two embedded electrodes are formed. After forming a gate dielectric, carbon nanotubes are assembled in a solution on a surface of the gate dielectric along the direction of an alternating current (AC) electrical field generated by applying a voltage between the two embedded electrodes. A source contact electrode and a drain contact electrode are formed by depositing a conductive material on both ends of the carbon nanotubes. Each of the source and drain contact electrodes can be electrically shorted to an underlying embedded electrode to reduce parasitic capacitance.Type: ApplicationFiled: October 21, 2011Publication date: April 25, 2013Applicants: KARLSRUHER INSTITUT FUER TECHNOLOGIE, INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Phaedon Avouris, Yu-Ming Lin, Mathias B. Steiner, Michael Engel, Ralph Krupke
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Patent number: 7161107Abstract: A method for separating metallic carbon nanotubes and semi-conducting carbon nanotubes includes providing a suspension containing a plurality of individual metallic carbon nanotubes and semi-conducting carbon nanotubes in a liquid, for which the dielectric constant ?L meets the requirement: ?M>?L>?H, wherein ?M is the dieletric constant of the metallic carbon nanotubes and ?H is the dielectric constant of the semi-conducting carbon nanotubes. A a non-homogeneous electric alternating field is applied to the suspension to create spatially separate species of the metallic carbon nanotubes and the semi-conducting carbon nanotubes. At least one of the separate species is then removed.Type: GrantFiled: April 2, 2004Date of Patent: January 9, 2007Assignee: Forschungszentrum Karlsruhe GmbHInventors: Ralph Krupke, Frank Hennrich
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Publication number: 20060266675Abstract: A method for separating metallic carbon nanotubes and semi-conducting carbon nanotubes includes providing a suspension containing a plurality of individual metallic carbon nanotubes and semi-conducting carbon nanotubes in a liquid, for which the dielectric constant ?L meets the requirement: ?M>?L>?H, wherein ?M is the dieletric constant of the metallic carbon nanotubes and ?H is the dielectric constant of the semi-conducting carbon nanotubes. A a non-homogeneous electric alternating field is applied to the suspension to create spatially separate species of the metallic carbon nanotubes and the semi-conducting carbon nanotubes. At least one of the separate species is then removed.Type: ApplicationFiled: April 2, 2004Publication date: November 30, 2006Applicant: Forschungszentrum Karlsruhe GmbHInventors: Ralph Krupke, Frank Hennrich
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Publication number: 20060242741Abstract: A method for separating metallic carbon nanotubes and semi-conducting carbon nanotubes includes providing a suspension containing a plurality of individual metallic carbon nanotubes and semi-conducting carbon nanotubes in a liquid, for which the dielectric constant ?L meets the requirement: ?M>?L>?H, wherein ?M is the dieletric constant of the metallic carbon nanotubes and ?H is the dielectric constant of the semi-conducting carbon nanotubes. A a non-homogeneous electric alternating field is applied to the suspension to create spatially separate species of the metallic carbon nanotubes and the semi-conducting carbon nanotubes. At least one of the separate species is then removed.Type: ApplicationFiled: November 23, 2005Publication date: October 26, 2006Applicant: Forschungszentrum Karlsruhe GmbHInventors: Ralph Krupke, Frank Hennrich