Patents by Inventor Ayaskanta Sahu
Ayaskanta Sahu 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).
-
Publication number: 20220302324Abstract: A photomultiplier containing a solid-state photoconductive film composed of amorphous selenium (a-Se) is provided. In the a-Se containing photomultiplier, a hole-blocking layer is provided that maximizes gain and maintains low dark conductivity. Also, the hole-blocking layer achieves reliable and repeatable impact ionization without irreversible breakdown. The hole-blocking layer is a non-insulating metal oxide having a dielectric constant (k) of greater than 10.Type: ApplicationFiled: September 11, 2020Publication date: September 22, 2022Applicants: THE RESEARCH FOUNDATION FOR THE STATE UNIVERSITY OF NEW YORK, NEW YORK UNIVERSITYInventors: Amirhossein GOLDAN, Wei ZHAO, Ayaskanta SAHU
-
Patent number: 10797215Abstract: This disclosure provides systems, methods, and apparatus related to graded thermoelectric materials. In one aspect, a method includes providing a plurality of nanostructures. The plurality of nanostructures comprise a thermoelectric material, with nanostructures of the plurality of nanostructures having first ligands disposed on surfaces of the nanostructures. The plurality of nanostructures is deposited on a substrate to form a layer. The layer is contacted with a solution containing second ligands. A ligand exchange process occurs where some of the first ligands disposed on the plurality of nanostructures are replaced with the second ligands. A first region of the layer is removed from contact with the solution so that the ligand exchange process does not occur in the first region of the layer, with the ligand exchange process occurring in the layer in contact with the solution. The layer is then removed from contact with the solution.Type: GrantFiled: September 1, 2016Date of Patent: October 6, 2020Inventors: Boris Russ, David Brown, Jared Lynch, Tristan Day, Nelson E. Coates, Ayaskanta Sahu, Jason D. Forster, Jeffrey Snyder, Jeffrey J. Urban, Rachel A. Segalman
-
Patent number: 10522732Abstract: This disclosure provides systems, methods, and apparatus related to thermoelectric polymer aerogels. In one aspect, a method includes depositing a solution on a substrate. The solution comprises a thermoelectric polymer. Solvent of the solution is removed to form a layer of the thermoelectric polymer. The layer is placed in a polar solvent to form a gel comprising the thermoelectric polymer. The gel is cooled to freeze the polar solvent. The gel is placed in a vacuum environment to sublimate the polar solvent from the gel to form an aerogel comprising the thermoelectric polymer.Type: GrantFiled: April 19, 2017Date of Patent: December 31, 2019Assignee: The Regents of the University of CaliforniaInventors: Edmond W. Zaia, Madeleine P. Gordon, Preston Zhou, Boris Russ, Nelson Coates, Ayaskanta Sahu, Jeffrey J. Urban
-
Patent number: 10249808Abstract: This disclosure provides systems, methods, and apparatus related to surface doping of nanostructures. In one aspect a plurality of nanostructures is fabricated with a solution-based process using a solvent. The plurality of nanostructures comprises a semiconductor. Each of the plurality of nanostructures has a surface with capping species attached to the surface. The plurality of nanostructures is mixed in the solvent with a dopant compound that includes doping species. During the mixing the capping species on the surfaces of the plurality of nanostructures are replaced by the doping species. Charge carriers are transferred between the doping species and the plurality of nanostructures.Type: GrantFiled: September 1, 2016Date of Patent: April 2, 2019Assignee: The Regents of the University of CaliforniaInventors: Ayaskanta Sahu, Boris Russ, Jeffrey J. Urban, Nelson E. Coates, Rachel A. Segalman, Jason D. Forster, Miao Liu, Fan Yang, Kristin A. Persson, Christopher Dames
-
Patent number: 9882108Abstract: This disclosure provides systems, methods, and apparatus related to thermoelectric materials. In one aspect, a method includes providing a plurality of nanostructures. The plurality of nanostructures comprise a thermoelectric material, with each nanostructure of the plurality of nanostructures having first ligands disposed on a surface of the nanostructure. The plurality of nanostructures is mixed with a solution containing second ligands and a ligand exchange process occurs in which the first ligands disposed on the plurality of nanostructures are replaced with the second ligands. The plurality of nanostructures is deposited on a substrate to form a layer. The layer is thermally annealed.Type: GrantFiled: September 1, 2016Date of Patent: January 30, 2018Assignee: The Regents of the University of CaliforniaInventors: Jeffrey J. Urban, Jared Lynch, Nelson Coates, Jason Forster, Ayaskanta Sahu, Michael Chabinyc, Boris Russ
-
Publication number: 20170338395Abstract: This disclosure provides systems, methods, and apparatus related to thermoelectric polymer aerogels. In one aspect, a method includes depositing a solution on a substrate. The solution comprises a thermoelectric polymer. Solvent of the solution is removed to form a layer of the thermoelectric polymer. The layer is placed in a polar solvent to form a gel comprising the thermoelectric polymer. The gel is cooled to freeze the polar solvent. The gel is placed in a vacuum environment to sublimate the polar solvent from the gel to form an aerogel comprising the thermoelectric polymer.Type: ApplicationFiled: April 19, 2017Publication date: November 23, 2017Applicant: The Regents of the University of CaliforniaInventors: Edmond W. Zaia, Madeleine P. Gordon, Preston Zhou, Boris Russ, Nelson Coates, Ayaskanta Sahu, Jeffrey J. Urban
-
Publication number: 20170069815Abstract: This disclosure provides systems, methods, and apparatus related to graded thermoelectric materials. In one aspect, a method includes providing a plurality of nanostructures. The plurality of nanostructures comprise a thermoelectric material, with nanostructures of the plurality of nanostructures having first ligands disposed on surfaces of the nanostructures. The plurality of nanostructures is deposited on a substrate to form a layer. The layer is contacted with a solution containing second ligands. A ligand exchange process occurs where some of the first ligands disposed on the plurality of nanostructures are replaced with the second ligands. A first region of the layer is removed from contact with the solution so that the ligand exchange process does not occur in the first region of the layer, with the ligand exchange process occurring in the layer in contact with the solution. The layer is then removed from contact with the solution.Type: ApplicationFiled: September 1, 2016Publication date: March 9, 2017Inventors: Boris Russ, David Brown, Jared Lynch, Tristan Day, Nelson E. Coates, Ayaskanta Sahu, Jason D. Forster, Jeffrey Snyder, Jeffrey J. Urban, Rachel A. Segalman
-
Publication number: 20170069813Abstract: This disclosure provides systems, methods, and apparatus related to thermoelectric materials. In one aspect, a method includes providing a plurality of nanostructures. The plurality of nanostructures comprise a thermoelectric material, with each nanostructure of the plurality of nanostructures having first ligands disposed on a surface of the nanostructure. The plurality of nanostructures is mixed with a solution containing second ligands and a ligand exchange process occurs in which the first ligands disposed on the plurality of nanostructures are replaced with the second ligands. The plurality of nanostructures is deposited on a substrate to form a layer. The layer is thermally annealed.Type: ApplicationFiled: September 1, 2016Publication date: March 9, 2017Applicant: The Regents of the University of CaliforniaInventors: Jeffrey J. Urban, Jared Lynch, Nelson Coates, Jason Forster, Ayaskanta Sahu, Michael Chabinyc, Boris Russ
-
Publication number: 20170069498Abstract: This disclosure provides systems, methods, and apparatus related to surface doping of nanostructures. In one aspect a plurality of nanostructures is fabricated with a solution-based process using a solvent. The plurality of nanostructures comprises a semiconductor. Each of the plurality of nanostructures has a surface with capping species attached to the surface. The plurality of nanostructures is mixed in the solvent with a dopant compound that includes doping species. During the mixing the capping species on the surfaces of the plurality of nanostructures are replaced by the doping species. Charge carriers are transferred between the doping species and the plurality of nanostructures.Type: ApplicationFiled: September 1, 2016Publication date: March 9, 2017Applicant: The Regents of the University of CaliforniaInventors: Ayaskanta Sahu, Boris Russ, Jeffrey J. Urban, Nelson E. Coates, Rachel A. Segalman, Jason D. Forster, Miao Liu, Fan Yang, Kristin A. Persson, Christopher Dames