Patents by Inventor Yongchul Ahn
Yongchul Ahn 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: 8194438Abstract: Non-volatile static random access memory (nvSRAM) that has a six transistor static random access memory (6T SRAM) cell electrically connected to a non-volatile random access memory (nvRAM) cell. The nvRAM cell has first and second variable magnetic resistors and first, second and third transistors.Type: GrantFiled: February 12, 2009Date of Patent: June 5, 2012Assignee: Seagate Technology LLCInventors: Yongchul Ahn, Antoine Khoueir, Yong Lu, Hongyue Liu
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Patent number: 8193089Abstract: Various embodiments of the present invention are generally directed to a method of forming a conductive via plug in a semiconductor device. A first and second metal layer are electrically connected by a via plug that is formed by depositing a tungsten seed layer on a plurality of metal barrier layers within a recess using atomic layer deposition. The recess is then filled with tungsten using chemical vapor deposition.Type: GrantFiled: July 13, 2009Date of Patent: June 5, 2012Assignee: Seagate Technology LLCInventors: Antoine Khoueir, Yongchul Ahn, Peter Nicholas Manos, Shuiyan Huang, Ivan Petrov Ivanov
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Patent number: 8183126Abstract: Various embodiments of the present invention are generally directed to an apparatus with embedded (bottom side) control lines for vertically stacked semiconductor elements, and a method for forming the same. In accordance with various embodiments, a first semiconductor wafer is provided with a first facing surface on which a first conductive layer is formed. The first semiconductor wafer is attached to a second semiconductor wafer to form a multi-wafer structure, the second semiconductor wafer having a second facing surface on which a second conductive wafer is formed. The first conductive layer is contactingly bonded to the second conductive layer to form an embedded combined conductive layer within said structure. Portions of the combined conductive layer are removed to form a plurality of spaced apart control lines that extend in a selected length or width dimension through said structure.Type: GrantFiled: July 13, 2009Date of Patent: May 22, 2012Assignee: Seagate Technology LLCInventors: Hyung-Kyu Lee, YoungPil Kim, Peter Nicholas Manos, Maroun Khoury, Dadi Setiadi, Chulmin Jung, Hsing-Kuen Liou, Paramasiyan Kamatchi Subramanian, Yongchul Ahn, Jinyoung Kim, Antoine Khoueir
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Publication number: 20120080725Abstract: A method includes providing a semiconductor wafer having a plurality of pillar structures extending orthogonally from the semiconductor wafer. An electrically conducting interconnect element is deposited onto at least selected vertical pillar transistors and a non-volatile variable resistive memory cell is deposited onto the electrically conducting interconnect layer to form a vertical transistor memory array.Type: ApplicationFiled: September 30, 2010Publication date: April 5, 2012Applicant: SEAGATE TECHNOLOGY LLCInventors: Peter Nicholas Manos, Young Pil Kim, Hyung-Kyu Lee, Yongchul Ahn, Jinyoung Kim, Antoine Khoueir, Brian Lee, Dadi Setiadi
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Patent number: 8030172Abstract: A semiconductor structure has a substrate having a trench, an isolation dielectric in the trench, and a stress buffer layer, between the substrate and the dielectric. Semiconductor devices containing the semiconductor structure may have higher reliability, and may have a reduced manufacturing costs per device.Type: GrantFiled: May 12, 2003Date of Patent: October 4, 2011Assignee: Cypress Semiconductor CorporationInventors: Yongchul Ahn, Kaichiu Wong, Venuka Jayatilaka
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Patent number: 7998758Abstract: A magnetic element and a method for making a magnetic element. The method includes patterning a first electrode material to form a first electrode on a substrate and depositing filler material on the substrate around the first electrode. The method further includes polishing to form a planar surface of filler and the first electrode. A magnetic cell is formed on the planar surface and a second electrode is formed on the magnetic cell. In some embodiments, the first electrode has an area that is at least 2:1 to the area of the magnetic cell.Type: GrantFiled: February 20, 2009Date of Patent: August 16, 2011Assignee: Seagate Technology LLCInventors: Yongchul Ahn, Shuiyuan Haung, Antoine Khoueir, Paul Anderson, Lili Jia, Christina Laura Hutchinson, Ivan Ivanov, Dimitar Dimitrov
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Patent number: 7965538Abstract: Apparatus and method for providing overcurrent protection to a resistive random access memory (RRAM) cell during an RRAM formation process used to prepare the cell for normal read and write operations. In accordance with various embodiments, the RRAM cell is connected between a first control line and a second control line, and an active protection device (APD) is connected between the second control line and an electrical ground terminal. A formation current is applied through the RRAM cell, and an activation voltage is concurrently applied to the APD to maintain a maximum magnitude of the formation current below a predetermined threshold level.Type: GrantFiled: July 13, 2009Date of Patent: June 21, 2011Assignee: Seagate Technology LLCInventors: Yongchul Ahn, Antoine Khoueir, Shuiyuan Huang, Peter Nicholas Manos, Maroun Khoury
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Publication number: 20110006377Abstract: Various embodiments of the present invention are generally directed to an apparatus with embedded (bottom side) control lines for vertically stacked semiconductor elements, and a method for forming the same. In accordance with various embodiments, a first semiconductor wafer is provided with a first facing surface on which a first conductive layer is formed. The first semiconductor wafer is attached to a second semiconductor wafer to form a multi-wafer structure, the second semiconductor wafer having a second facing surface on which a second conductive wafer is formed. The first conductive layer is contactingly bonded to the second conductive layer to form an embedded combined conductive layer within said structure. Portions of the combined conductive layer are removed to form a plurality of spaced apart control lines that extend in a selected length or width dimension through said structure.Type: ApplicationFiled: July 13, 2009Publication date: January 13, 2011Applicant: SEAGATE TECHNOLOGY LLCInventors: Hyung-Kyu Lee, YoungPil Kim, Peter Nicholas Manos, Maroun Khoury, Dadi Setiadi, Chulmin Jung, Hsing-Kuen Liou, Paramasiyan Kamatchi Subramanian, Yongchul Ahn, Jinyoung Kim, Antoine Khoueir
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Publication number: 20110007552Abstract: Apparatus and method for providing overcurrent protection to a resistive random access memory (RRAM) cell during an RRAM formation process used to prepare the cell for normal read and write operations. In accordance with various embodiments, the RRAM cell is connected between a first control line and a second control line, and an active protection device (APD) is connected between the second control line and an electrical ground terminal.Type: ApplicationFiled: July 13, 2009Publication date: January 13, 2011Applicant: SEAGATE TECHNOLOGY LLCInventors: Yongchul Ahn, Antoine Khoueir, Shuiyuan Huang, Peter Nicholas Manos, Maroun Khoury
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Publication number: 20110006436Abstract: Various embodiments of the present invention are generally directed to a method of forming a conductive via plug in a semiconductor device. A first and second metal layer are electrically connected by a via plug that is formed by depositing a tungsten seed layer on a plurality of metal barrier layers within a recess using atomic layer deposition. The recess is then filled with tungsten using chemical vapor deposition.Type: ApplicationFiled: July 13, 2009Publication date: January 13, 2011Applicant: SEAGATE TECHNOLOGY LLCInventors: Antoine Khoueir, Yongchul Ahn, Peter Nicholas Manos, Shuiyuan Huang, Ivan Petrov Ivanov
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Publication number: 20110005920Abstract: Various embodiments of the present invention are generally directed to an apparatus and method for low temperature physical vapor deposition (PVD) of an amorphous thin film layer of material onto a substrate. A PVD chamber is configured to support a substrate and has a cathode target with a layer of sputtering material thereon, an anode shield, and a magnetron assembly adjacent the target. A high impulse power magnetron sputtering (HiPIMS) power supply is coupled to the PVD chamber, the power supply having a charging circuit and a charge storage device. The power supply applies relatively high energy, low duty cycle pulses to the magnetron assembly to sputter, via self ionizing plasma, relatively low energy ions from the layer of sputtering material to deposit an amorphous thin film layer onto the substrate.Type: ApplicationFiled: July 13, 2009Publication date: January 13, 2011Applicant: SEAGATE TECHNOLOGY LLCInventors: Ivan Petrov Ivanov, Antoine Khoueir, Wei Tian, Paul E. Anderson, Lili Jia, Yongchul Ahn, Michael Xuefei Tang, Yang Dong
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Publication number: 20110006275Abstract: A resistive sense memory cell includes a layer of crystalline praseodymium calcium manganese oxide and a layer of amorphous praseodymium calcium manganese oxide disposed on the layer of crystalline praseodymium calcium manganese oxide forming a resistive sense memory stack. A first and second electrode are separated by the resistive sense memory stack. The resistive sense memory cell can further include an oxygen diffusion barrier layer separating the layer of crystalline praseodymium calcium manganese oxide from the layer of amorphous praseodymium calcium manganese oxide a layer. Methods include depositing an amorphous praseodymium calcium manganese oxide disposed on the layer of crystalline praseodymium calcium manganese oxide forming a resistive sense memory stack.Type: ApplicationFiled: July 13, 2009Publication date: January 13, 2011Applicant: SEAGATE TECHNOLOGY LLCInventors: Andreas Roelofs, Markus Siegert, Venugopalan Vaithyanathan, Wei Tian, Yongchul Ahn, Muralikrishnan Balakrishnan, Olle Heinonen
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Publication number: 20100327248Abstract: A method of making a memory cell or magnetic element by using two hard masks. The method includes first patterning a second hard mask to form a reduced second hard mask, with a first hard mask being an etch stop for the patterning process, and then patterning the first hard mask to form a reduced first hard mask by using the reduced second hard mask as a mask and using an etch stop layer as an etch stop. After patterning both hard masks, then patterning a functional layer by using the reduced first hard mask as a mask. In the resulting memory cell, the first hard mask layer is also a top lead, and the diameter of the first hard mask layer is at least essentially the same as the diameter of the etch stop layer, the adhesion layer, and the functional layer.Type: ApplicationFiled: June 29, 2009Publication date: December 30, 2010Applicant: SEAGATE TECHNOLOGY LLCInventors: Antoine Khoueir, Shuiyuan Huang, Andrew Habermas, Helena Stadniychuk, Ivan P. Ivanov, Yongchul Ahn
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Publication number: 20100202191Abstract: Non-volatile static random access memory (nvSRAM) that has a six transistor static random access memory (6T SRAM) cell electrically connected to a non-volatile random access memory (nvRAM) cell. The nvRAM cell has first and second variable magnetic resistors and first, second and third transistors.Type: ApplicationFiled: February 12, 2009Publication date: August 12, 2010Applicant: SEAGATE TECHNOLOGY LLCInventors: Yongchul Ahn, Antoine Khoueir, Yong Lu, Hongyue Liu
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Publication number: 20100109107Abstract: A magnetic element and a method for making a magnetic element. The method includes patterning a first electrode material to form a first electrode on a substrate and depositing filler material on the substrate around the first electrode. The method further includes polishing to form a planar surface of filler and the first electrode. A magnetic cell is formed on the planar surface and a second electrode is formed on the magnetic cell. In some embodiments, the first electrode has an area that is at least 2:1 to the area of the magnetic cell.Type: ApplicationFiled: February 20, 2009Publication date: May 6, 2010Applicant: SEAGATE TECHNOLOGY LLCInventors: Yongchul Ahn, Shuiyuan Huang, Antoine Khoueir, Paul Anderson, Lili Jia, Christina Laura Hutchinson, Ivan Ivanov, Dimitar Dimitrov
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Publication number: 20100109085Abstract: Memory elements and methods for making memory elements. One method of making a memory element includes forming a first electrode, forming an electrically conductive current densifying element and a memory cell on the first electrode, the memory cell and the current densifying element adjacent to each other. A second electrode is formed over the current densifying element and the memory cell. The memory elements may be resistance random access memory elements.Type: ApplicationFiled: March 20, 2009Publication date: May 6, 2010Applicant: SEAGATE TECHNOLOGY LLCInventors: Jinyoung Kim, Yongchul Ahn, Muralikrishnan Balakrishnan, Tangshiun Yeh, Antoine Khoueir
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Patent number: 6770566Abstract: A method of forming a semiconductor structure is described that includes etching a first metal layer at the bottom of a via in a first insulating layer to expose a second metal layer, wherein the first metal layer is on the second metal layer, and wherein the etching of the first metal layer is not reactive-ion etching. Methods of making semiconductor devices and electronic devices are also described.Type: GrantFiled: May 16, 2002Date of Patent: August 3, 2004Assignee: Cypress Semiconductor CorporationInventors: Yongchul Ahn, Kaichiu Wong
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Patent number: 6727161Abstract: A process for making a semiconductor structure, includes forming a second dielectric layer on exposed regions of an intermediate structure. The intermediate structure includes: a semiconductor substrate having the regions, a first dielectric layer on at least a first portion of the semiconductor substrate, an etch-stop layer on at least a second portion of the first dielectric layer, and spacers on at least a third portion of said semiconductor substrate. The spacers are adjacent edges of the etch-stop layer and adjacent the exposed regions.Type: GrantFiled: February 16, 2000Date of Patent: April 27, 2004Assignee: Cypress Semiconductor Corp.Inventors: Yongchul Ahn, Kaichiu Wong
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Publication number: 20030032260Abstract: A process for making a semiconductor structure, includes forming a second dielectric layer on exposed regions of an intermediate structure. The intermediate structure includes: a semiconductor substrate having the regions, a first dielectric layer on at least a first portion of the semiconductor substrate, an etch-stop layer on at least a second portion of the first dielectric layer, and spacers on at least a third portion of said semiconductor substrate. The spacers are adjacent edges of the etch-stop layer and adjacent the exposed regions.Type: ApplicationFiled: February 16, 2000Publication date: February 13, 2003Inventors: Yongchul Ahn, Kaichiu Wong
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Patent number: 5652187Abstract: The surface of a borophosphosilicate glass (BPSG) dielectric film undergoes a surface treatment, such as by plasma treatment with N.sub.2 O, N.sub.2 +NH.sub.3, N.sub.2, O.sub.2 or O.sub.3. Erosion caused by H.sub.2 SO.sub.4 boiling or by humidity absorption from the atmosphere is thereby reduced so that reflow processing at temperatures ideally below 850.degree. C. is possible and an interlayer dielectric film of excellent planarity is thus formed.Type: GrantFiled: February 1, 1994Date of Patent: July 29, 1997Assignee: Samsung Electronics Co., Ltd.Inventors: Changgyu Kim, Changki Hong, Uin Chung, Yongchul Ahn