Patents by Inventor Khee Yong Lim

Khee Yong Lim 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: 20190393338
    Abstract: The present disclosure relates to semiconductor structures and, more particularly, to extended drain MOSFET structures with a dual oxide thickness and methods of manufacture. The structure includes an extended drain metal oxide semiconductor transistor (EDMOS) comprising a gate structure with a dual oxide scheme.
    Type: Application
    Filed: June 20, 2018
    Publication date: December 26, 2019
    Inventors: Chia Ching YEO, Khee Yong LIM, Kiok Boone Elgin QUEK, Donald R. DISNEY
  • Patent number: 10424568
    Abstract: A method of forming a device including a SPAD detector and a BSI visible light sensor positioned on different planes, the device exhibiting improved resolution and pixel density are provided. Embodiments include a photodiode for detecting visible light; and a SPAD detector for detecting IR radiation, wherein the photodiode and the SPAD detector are on different planes.
    Type: Grant
    Filed: June 19, 2018
    Date of Patent: September 24, 2019
    Assignee: GLOBALFOUNDRIES Singapore Pte. Ltd.
    Inventors: Kian Ming Tan, Khee Yong Lim, Elgin Kiok Boone Quek
  • Publication number: 20190267446
    Abstract: Methods for producing FETs with negative capacitance and the resulting device are disclosed. Embodiments include forming a gate stack over a semiconductor substrate by: forming a gate oxide over the semiconductor substrate; forming a first metal gate electrode over the gate oxide; forming a dummy gate over the metal gate electrode; and forming sidewall spacers on first and second sides of the gate stack; forming an ILD over the substrate and gate stack; removing the dummy gate and at least a portion of sidewall spacers to form an opening; forming a ferro-electric (FE) layer in the opening; and forming a second metal gate electrode over the FE layer.
    Type: Application
    Filed: February 23, 2018
    Publication date: August 29, 2019
    Inventors: Yongtian HOU, Khee Yong LIM, Ming-Tsang TSAI, Elgin Kiok Boone QUEK
  • Patent number: 10395987
    Abstract: The disclosure is related to MV transistors with reduced gate induced drain leakage (GIDL) and impact ionization. The reduced GILD and impact ionization are achieved without increasing device pitch of the MV transistor. A low voltage (LV) device region and a medium voltage (MV) device region are disposed on the substrate. Non-extended spacers are disposed on the sidewalls of the LV gate in the LV device region; extended L shaped spacers are disposed on the sidewalls of the MV gate in the MV device region. The non-extended spacers and extended L shape spacers are patterned simultaneously. Extended L shaped spacers displace the MV heavily doped (HD) regions a greater distance from at least one sidewall of the MV gate to reduce the GIDL and impact ionization of the MV transistor.
    Type: Grant
    Filed: January 9, 2017
    Date of Patent: August 27, 2019
    Assignee: GLOBALFOUNDRIES SINGAPORE PTE. LTD.
    Inventors: Chia Ching Yeo, Kiok Boone Elgin Quek, Khee Yong Lim, Jae Han Cha, Yung Fu Chong
  • Patent number: 10103156
    Abstract: A device and methods for forming the device are disclosed. The method includes providing a substrate prepared with a memory cell region and forming memory cell pairs in the cell region. The memory cell pair comprises of first and second split gate memory cells. Each memory cell includes a first gate serving as an access gate, a second gate adjacent to the first gate, the second gate serving as a storage gate, a first source/drain (S/D) region adjacent to the first gate and a second S/D region adjacent to the second gate. The method also includes forming silicide contacts on the substrate on the gate conductors and first S/D regions and exposed buried common source lines (SLs) in pick-up regions, such that increasing the displacement distance in the wordline and source line (WLSL) region to an extended displacement distance DE avoids shorting between the first offset access gate conductors and adjacent access gate conductors of the rows of memory cell pairs.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: October 16, 2018
    Assignee: GLOBALFOUNDRIES Singapore Pte. Ltd.
    Inventors: Xinshu Cai, Khee Yong Lim, Kiok Boone Elgin Quek
  • Publication number: 20180233509
    Abstract: A device and methods for forming the device are disclosed. The method includes providing a substrate prepared with a memory cell region and forming memory cell pairs in the cell region. The memory cell pair comprises of first and second split gate memory cells. Each memory cell includes a first gate serving as an access gate, a second gate adjacent to the first gate, the second gate serving as a storage gate, a first source/drain (S/D) region adjacent to the first gate and a second S/D region adjacent to the second gate. The method also includes forming silicide contacts on the substrate on the gate conductors and first S/D regions and exposed buried common source lines (SLs) in pick-up regions, such that increasing the displacement distance in the wordline and source line (WLSL) region to an extended displacement distance DE avoids shorting between the first offset access gate conductors and adjacent access gate conductors of the rows of memory cell pairs.
    Type: Application
    Filed: February 16, 2017
    Publication date: August 16, 2018
    Inventors: Xinshu CAI, Khee Yong LIM, Kiok Boone Elgin QUEK
  • Patent number: 10020372
    Abstract: A method of forming a thick EG polysilicon over the FG and resulting device are provided. Embodiments include forming a CG on a substrate; forming an STI between a logic region and the CG; forming a polysilicon EG through the CG and CG HM; forming a polysilicon structure over the logic and STI; forming and overfilling with polysilicon a WL trench through the CG and CG HM, between the EG and STI; forming a buffer oxide in the polysilicon structure over the logic region and part of the STI; recessing the buffer oxide and etching back the polysilicon overfill down the CG HM; forming a second buffer oxide over the EG and logic region; recessing the WL polysilicon; removing the first and second buffer oxides; forming a mask with an opening over a center of the WL, the STI, and a majority of the logic region; and removing exposed polysilicon.
    Type: Grant
    Filed: April 25, 2017
    Date of Patent: July 10, 2018
    Assignee: GLOBALFOUNDRIES SINGAPORE PTE. LTD.
    Inventors: Khee Yong Lim, Kian Ming Tan, Fangxin Deng, Zhiqiang Teo, Xinshu Cai, Elgin Kiok Boone Quek, Fan Zhang
  • Patent number: 9911867
    Abstract: Integrated circuits, nonvolatile memory (NVM) structures, and methods for fabricating integrated circuits with NVM structures are provided. An exemplary integrated circuit includes a substrate and a dual-bit NVM structure overlying the substrate. The dual-bit NVM structure includes primary, first adjacent and second adjacent fin structures laterally extending in parallel over the substrate. The primary fin structure includes source, channel and drain regions. Each adjacent fin structure includes a program/erase gate. The dual-bit NVM structure further includes a first floating gate located between the channel region of the primary fin structure and the first adjacent fin structure and a second floating gate located between the channel region of the primary fin structure and the second adjacent fin structure. Also, the dual-bit NVM structure includes a control gate adjacent the primary fin structure.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: March 6, 2018
    Assignee: GLOBALFOUNDRIES SINGAPORE PTE. LTD.
    Inventors: Ming-Tsang Tsai, Khee Yong Lim, Kiok Boone Elgin Quek
  • Publication number: 20180006158
    Abstract: Integrated circuits, nonvolatile memory (NVM) structures, and methods for fabricating integrated circuits with NVM structures are provided. An exemplary integrated circuit includes a substrate and a dual-bit NVM structure overlying the substrate. The dual-bit NVM structure includes primary, first adjacent and second adjacent fin structures laterally extending in parallel over the substrate. The primary fin structure includes source, channel and drain regions. Each adjacent fin structure includes a program/erase gate. The dual-bit NVM structure further includes a first floating gate located between the channel region of the primary fin structure and the first adjacent fin structure and a second floating gate located between the channel region of the primary fin structure and the second adjacent fin structure. Also, the dual-bit NVM structure includes a control gate adjacent the primary fin structure.
    Type: Application
    Filed: July 1, 2016
    Publication date: January 4, 2018
    Inventors: Ming-Tsang Tsai, Khee Yong Lim, Kiok Boone Elgin Quek
  • Publication number: 20170200649
    Abstract: The disclosure is related to MV transistors with reduced gate induced drain leakage (GIDL) and impact ionization. The reduced GILD and impact ionization are achieved without increasing device pitch of the MV transistor. A low voltage (LV) device region and a medium voltage (MV) device region are disposed on the substrate. Non-extended spacers are disposed on the sidewalls of the LV gate in the LV device region; extended L shaped spacers are disposed on the sidewalls of the MV gate in the MV device region. The non-extended spacers and extended L shape spacers are patterned simultaneously. Extended L shaped spacers displace the MV heavily doped (HD) regions a greater distance from at least one sidewall of the MV gate to reduce the GIDL and impact ionization of the MV transistor.
    Type: Application
    Filed: January 9, 2017
    Publication date: July 13, 2017
    Inventors: Chia Ching YEO, Kiok Boone Elgin QUEK, Khee Yong LIM, Jae Han CHA, Yung Fu CHONG
  • Patent number: 9653365
    Abstract: A method for fabricating an integrated circuit that include providing or obtaining an extremely thin silicon-on-insulator (ETSOI) substrate, dividing the ETSOI substrate into a low voltage field effect transistor (FET) region and one or both of a medium voltage FET region and a high voltage FET regions, and forming a low voltage FET within the low voltage FET regions and forming a medium and/or high voltage FET within the medium and/or high voltage FET region(s). Channel, source, and drain structures of the low voltage FET are formed in an upper silicon layer that is disposed above a buried oxide layer of the ETSOI substrate, whereas channel, source, and drain structures of the medium and/or high voltage FETs are formed at least partially below the upper silicon layer.
    Type: Grant
    Filed: April 8, 2016
    Date of Patent: May 16, 2017
    Assignee: GLOBALFOUNDRIES SINGAPORE PTE. LTD.
    Inventors: Khee Yong Lim, Jae Han Cha, Chia Ching Yeo, Kiok Boone Elgin Quek
  • Patent number: 9520506
    Abstract: A capacitor and method of forming a capacitor are presented. The capacitor includes a substrate having a capacitor region in which the capacitor is disposed. The capacitor includes first, second and third sub-capacitors (C1, C2 and C3). The C1 comprises a metal oxide semiconductor (MOS) capacitor which includes a gate on the substrate. The gate includes a gate electrode over a gate dielectric. A first C1 plate is served by the gate electrode, a second C1 plate is served by the substrate of the capacitor region and a C1 capacitor dielectric is served by the gate dielectric. The C2 includes a back-end-of-line (BEOL) vertical capacitor disposed in ILD layers with metal levels and via levels. A plurality of metal lines are disposed in the metal levels.
    Type: Grant
    Filed: July 23, 2014
    Date of Patent: December 13, 2016
    Assignee: GLOBALFOUNDRIES SINGAPORE PTE. LTD.
    Inventors: Laiqiang Luo, Xinshu Cai, Danny Shum, Fan Zhang, Khee Yong Lim, Juan Boon Tan, Shaoqiang Zhang
  • Patent number: 9444041
    Abstract: A memory device and a method of making the same are presented. The memory device includes a substrate and a memory cell formed on the substrate. The memory cell includes a single transistor. The single transistor includes a first gate on the substrate which functions as a control gate and a second gate embedded in the substrate which functions as a select gate.
    Type: Grant
    Filed: December 31, 2013
    Date of Patent: September 13, 2016
    Assignee: GLOBALFOUNDRIES Singapore Pte. Ltd.
    Inventors: Khee Yong Lim, Kian Ming Tan, Elgin Kiok Boone Quek
  • Publication number: 20160190146
    Abstract: Integrated circuits and methods fabricating memory cells and integrated circuits are provided. In one embodiment, a method for fabricating a memory cell includes doping a semiconductor substrate to define a conductive region. The method includes forming a stacked structure over the semiconductor substrate. The stacked structure lies over the conductive region and includes a control gate overlying a floating gate. A source line region is formed adjacent a first side of the stacked structure. The method includes forming a contact over the semiconductor substrate and adjacent a second side of the stacked structure to define an electrical current path from the source line region through the conductive region under the stacked structure to the contact.
    Type: Application
    Filed: December 29, 2014
    Publication date: June 30, 2016
    Inventors: Zufa Zhang, Khee Yong Lim, Xinshu Cai
  • Patent number: 9362297
    Abstract: Integrated circuits are provided. An exemplary integrated circuit includes a source/drain region in a semiconductor substrate. The integrated circuit includes a charge storage structure overlying the semiconductor substrate and having a first sidewall overlying the source/drain region. The integrated circuit also includes a control gate overlying the source/drain region. Further, the integrated circuit includes a first select gate overlying the semiconductor substrate and adjacent the first sidewall. A first memory cell is formed by the control gate and the first select gate.
    Type: Grant
    Filed: December 29, 2014
    Date of Patent: June 7, 2016
    Assignee: GLOBALFOUNDRIES SINGAPORE PTE. LTD.
    Inventors: Zhang Zufa, Khee Yong Lim, Quek Kiok Boone Elgin
  • Patent number: 9343466
    Abstract: Methods for fabricating memory cells, methods for fabricating integrated circuits having memory cells, and integrated circuits having memory cells are provided. In one example, a method for fabricating a memory cell includes depositing a first tunnel dielectric layer over a semiconductor substrate. The method includes depositing a floating gate material over the first tunnel dielectric layer. The method forms two control gate stacks over the floating gate material, defines a source line area between the two control gate stacks, and defines select gate areas adjacent the two control gate stacks. The method includes depositing a second tunnel dielectric layer over the select gate areas of the semiconductor substrate. Further, the method includes forming select gates over the second tunnel dielectric layer over the select gate areas of the semiconductor substrate. The second tunnel dielectric layer forms a gate dielectric layer for each select gate.
    Type: Grant
    Filed: December 29, 2014
    Date of Patent: May 17, 2016
    Assignee: GLOBALFOUNDRIES SINGAPORE PTE. LTD.
    Inventors: Zufa Zhang, Khee Yong Lim
  • Patent number: 9196830
    Abstract: A device is disclosed. The device includes a top electrode, a bottom electrode and a storage element between the top and bottom electrodes. The storage element includes a heat generating element disposed on the bottom electrode, a phase change element wrapping around an upper portion of the heat generating element, and a dielectric liner sandwiched between the phase change element and the heat generating element.
    Type: Grant
    Filed: February 18, 2015
    Date of Patent: November 24, 2015
    Assignee: GLOBALFOUNDRIES SINGAPORE PTE. LTD.
    Inventors: Khee Yong Lim, Zufa Zhang
  • Publication number: 20150236034
    Abstract: A memory device requiring no or minimal additional mask for fabrication having a low cost, a small footprint, and multiple-time programming capability is disclosed. Embodiments include: a substrate; a gate stack on the substrate; a source and drain in the substrate at opposite sides, respectively, of the gate stack; a source extension region in the substrate adjacent the source region, wherein no drain extension region is formed on the other side of the gate stack; a tunnel oxide liner on the substrate at each side of the gate stack and on side surfaces of the gate stack; and a charge-trapping (CT) spacer on each tunnel oxide liner.
    Type: Application
    Filed: May 5, 2015
    Publication date: August 20, 2015
    Inventors: Eng Huat TOH, Khee Yong LIM, Shyue Seng TAN, Elgin QUEK
  • Publication number: 20150162532
    Abstract: A device is disclosed. The device includes a top electrode, a bottom electrode and a storage element between the top and bottom electrodes. The storage element includes a heat generating element disposed on the bottom electrode, a phase change element wrapping around an upper portion of the heat generating element, and a dielectric liner sandwiched between the phase change element and the heat generating element.
    Type: Application
    Filed: February 18, 2015
    Publication date: June 11, 2015
    Inventors: Khee Yong LIM, Zufa ZHANG
  • Patent number: 9054209
    Abstract: A method for enabling fabrication of memory devices requiring no or minimal additional mask for fabrication having a low cost, a small footprint, and multiple-time programming capability is disclosed. Embodiments include: forming a gate stack on a substrate; forming a source extension region in the substrate on one side of the gate stack, wherein no drain extension region is formed on the other side of the gate stack; forming a tunnel oxide liner on side surfaces of the gate stack and on the substrate on each side of the gate stack; forming a charge-trapping spacer on each tunnel oxide liner; and forming a source in the substrate on the one side of the gate stack and a drain in the substrate on the other side of the gate stack.
    Type: Grant
    Filed: August 16, 2012
    Date of Patent: June 9, 2015
    Assignee: GLOBALFOUNDRIES Singapore Pte. Ltd.
    Inventors: Eng Huat Toh, Khee Yong Lim, Shyue Seng Tan, Elgin Quek