Patents by Inventor Wee Kiong Choi
Wee Kiong Choi 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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Publication number: 20210257677Abstract: A Li-ion thin film microbattery, a microbattery array, a method of fabricating a Li-ion thin film microbattery and a method of fabricating a microbattery array. The Li-ion thin film microbattery comprises a Li-free cathode comprising a transition metal oxide thin film; an anode comprising a lithiated Ge or Si thin film; and an electrolyte film disposed between the cathode and the anode; wherein a Li-source of the Li-ion thin film microbattery is provided by means of the lithiated Ge or Si thin film.Type: ApplicationFiled: February 26, 2021Publication date: August 19, 2021Applicants: MASSACHUSETTS INSTITUTE OF TECHNOLOGY, NATIONAL UNIVERSITY OF SINGAPOREInventors: Daniele Perego, Rajamouly Omampuliyur Swaminathan, Ye Lin Thu, Shao-Horn Yang, Wee Kiong Choi, Carl Vernette Thompson, II
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Publication number: 20200212508Abstract: A Li-ion thin film microbattery, a microbattery array, a method of fabricating a Li-ion thin film microbattery and a method of fabricating a microbattery array. The Li-ion thin film microbattery comprises a Li-free cathode comprising a transition metal oxide thin film; an anode comprising a lithiated Ge or Si thin film; and an electrolyte film disposed between the cathode and the anode; wherein a Li-source of the Li-ion thin film microbattery is provided by means of the lithiated Ge or Si thin film.Type: ApplicationFiled: July 28, 2017Publication date: July 2, 2020Applicants: MASSACHUSETTS INSTITUTE OF TECHNOLOGY, NATIONAL UNIVERSITY OF SINGAPOREInventors: Daniele PEREGO, Rajamouly OMAMPULIYUR SWAMINATHAN, Ye Lin Thu (No Family Name), Shao-Horn YANG, Wee Kiong CHOI, Carl Vernette THOMPSON, II
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Publication number: 20140357529Abstract: There is provided a microarray comprising a plurality of active agents immobilized onto an array of porous nanostructures, wherein each nanostructure has a network of pores that extends throughout the thickness of said nano structure.Type: ApplicationFiled: December 19, 2012Publication date: December 4, 2014Applicant: National University of SingaporeInventors: Wee Kiong Choi, Heng Phon Too, Raj Rajagopalan, Lihan Zhou, Mohammed Khalid Bin Dawood, Han Zheng, He Cheng
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Patent number: 8668833Abstract: A method of forming a discrete nanostructured element at one or more predetermined locations on a substrate is presented. The method includes forming a mask member over the substrate. A window is formed in the mask member at each of one or more locations at which it is required to form the nanostructured element thereby to expose a portion of a surface of the substrate. A portion of the substrate exposed by the window at the one or more locations is removed to form one or more recesses in the substrate. The method further includes forming a layer of a nanostructure medium over a surface of the recess and annealing the structure thereby to form the nanostructured element in each of the one or more recesses. The nanostructured element includes a portion of the nanostructure medium and has an external dimension along at least two substantially orthogonal directions of less than substantially 100 nm.Type: GrantFiled: May 21, 2008Date of Patent: March 11, 2014Assignees: GLOBALFOUNDRIES Singapore Pte. Ltd., National University of SingaporeInventors: Han Guan Chew, Fei Zheng, Wee Kiong Choi, Tze Haw Liew
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Publication number: 20130171413Abstract: Methods for altering the wetting property of the surface of a substrate are disclosed. The methods can include the step of providing an array of nanostructures on the substrate, each nanostructure having a proximal end adjacent to the substrate and a distal end opposite to the proximal end. The methods can also include the step of moving the distal ends of at least one subset of the array of nanostructures towards each other to form at least one nanostructure cluster. The nanostructures of each cluster have distal ends that are spaced closer to each other relative to the respective proximal ends of the adjacent nanostructures, the nanostructure cluster altering the wetting property of the substrate.Type: ApplicationFiled: September 13, 2011Publication date: July 4, 2013Inventors: Saif A. Khan, Mohammed Khalid Bin Dawood, Raj Rajagopalan, Wee Kiong Choi, Han Zheng
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Publication number: 20090291311Abstract: A method of forming a discrete nanostructured element at one or more predetermined locations on a substrate is presented. The method includes forming a mask member over the substrate. A window is formed in the mask member at each of one or more locations at which it is required to form the nanostructured element thereby to expose a portion of a surface of the substrate. A portion of the substrate exposed by the window at the one or more locations is removed to form one or more recesses in the substrate. The method further includes forming a layer of a nanostructure medium over a surface of the recess and annealing the structure thereby to form the nanostructured element in each of the one or more recesses. The nanostructured element includes a portion of the nanostructure medium and has an external dimension along at least two substantially orthogonal directions of less than substantially 100 nm.Type: ApplicationFiled: May 21, 2008Publication date: November 26, 2009Applicants: CHARTERED SEMICONDUCTOR MANUFACTURING, LTD., NATIONAL UNIVERSITY OF SINGAPOREInventors: Han Guan Chew, Fei Zheng, Wee Kiong Choi, Tze Haw Liew
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Publication number: 20080217678Abstract: A memory gate stack structure (100) comprising a substrate layer (102) comprising a silicon-based material, a tunnel layer (104) formed on the substrate layer, a charge storage layer (106) formed on the tunnel layer and comprising a hafnium-aluminium-oxide-based material, a blocking layer (108) formed on the charge storage layer, and a gate layer (110) formed on the blocking layer.Type: ApplicationFiled: March 11, 2004Publication date: September 11, 2008Applicant: National University of SingaporeInventors: Yan Ny Tan, Wai Kim Chim, Byung Jin Cho, Wee Kiong Choi
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Patent number: 6962850Abstract: Devices with embedded silicon or germanium nanocrystals, fabricated using ion implantation, exhibit superior data-retention characteristics relative to conventional floating-gate devices. However, the prior art use of ion implantation for their manufacture introduces several problems. These have been overcome by initial use of rapid thermal oxidation to grow a high quality layer of thin tunnel oxide. Chemical vapor deposition is then used to deposit a germanium doped oxide layer. A capping oxide is then deposited following which the structure is rapid thermally annealed to synthesize the germanium nanocrystals.Type: GrantFiled: October 1, 2003Date of Patent: November 8, 2005Assignee: Chartered Semiconductor Manufacturing Ltd.Inventors: Vincent Ho, Wee Kiong Choi, Lap Chan, Wai Kin Chim, Vivian Ng, Cheng Lin Heng, Lee Wee Teo
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Patent number: 6656792Abstract: A Flash memory is provided having a trilayer structure of rapid thermal oxide/germanium (Ge) nanocrystals in silicon dioxide (SiO2)/sputtered SiO2 cap with demonstrated via capacitance versus voltage (C-V) measurements having memory hysteresis due to Ge nanocrystals in the middle layer of the trilayer structure. The Ge nanocrystals are synthesized by rapid thermal annealing of a co-sputtered Ge+SiO2 layer.Type: GrantFiled: March 1, 2002Date of Patent: December 2, 2003Assignee: Chartered Semiconductor Manufacturing LTDInventors: Wee Kiong Choi, Wai Kin Chim, Vivian Ng, Lap Chan
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Publication number: 20030077863Abstract: A Flash memory is provided having a trilayer structure of rapid thermal oxide/germanium (Ge) nanocrystals in silicon dioxide (SiO2)/sputtered SiO2 cap with demonstrated via capacitance versus voltage (C-V) measurements having memory hysteresis due to Ge nanocrystals in the middle layer of the trilayer structure. The Ge nanocrystals are synthesized by rapid thermal annealing of a co-sputtered Ge+SiO2 layer.Type: ApplicationFiled: March 1, 2002Publication date: April 24, 2003Inventors: Wee Kiong Choi, Wai Kin Chim, Vivian Ng, Lap Chan