Patents by Inventor Yong Meng

Yong Meng 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: 20020102784
    Abstract: A method for a vertical transistor by selective epi deposition to form the conductive source, drain, and channel layers. The conductive source, drain, and channel layers are preferably formed by a selective epi process. Dielectric masks define the conductive layers and make areas to form vertical contacts to the conductive S/D and channel layers.
    Type: Application
    Filed: January 26, 2001
    Publication date: August 1, 2002
    Applicant: Chartered Semiconductor Manufacturing Ltd.
    Inventors: James Yong Meng Lee, Ying Keung Leung, Yelehanka Ramachandramurthy Pradeep, Jia Zhen Zheng, Lap Chan, Elgin Quek, Ravi Sundaresan, Yang Pan
  • Publication number: 20020098655
    Abstract: A method of fabricating a vertical channel transistor, comprising the following steps. A semiconductor substrate having an upper surface is provided. A high doped N-type lower epitaxial silicon layer is formed on the semiconductor substrate. A low doped P-type middle epitaxial silicon layer is formed on the lower epitaxial silicon layer. A high doped N-type upper epitaxial silicon layer is formed on the middle epitaxial silicon layer. The lower, middle, and upper epitaxial silicon layers are etched to form a epitaxial layer stack defined by isolation trenches. Oxide is formed within the isolation trenches. The oxide is etched to form a gate trench within one of the isolation trenches exposing a sidewall of the epitaxial layer stack facing the gate trench. Multi-quantum wells or a stained-layer super lattice is formed on the exposed epitaxial layer stack sidewall. A gate dielectric layer is formed on the multi-quantum wells or the stained-layer super lattice and within the gate trench.
    Type: Application
    Filed: January 19, 2001
    Publication date: July 25, 2002
    Applicant: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Jia Zhen Zheng, Lap Chan, Elgin Quek, Ravi Sundaresan, Yang Pan, James Yong Meng Lee, Ying Keung Leung, Yelehanka Ramachandramurthy Pradeep
  • Publication number: 20020094622
    Abstract: A method for forming a self-aligned, recessed channel, MOSFET device that alleviates the problems due to short channel and hot carrier effects while reducing inter-electrode capacitance is described. A substrate with an active area encompassed by a shallow trench isolation (STI) region is provided. A mask oxide layer is then patterned and etched to expose the substrate and a portion of the STI region. The surface is etched and the mask oxide layer is eroded away while creating a gate recess in the unmasked area. A thin pad oxide layer is then grown overlying the surface followed by a deposition of a thick silicon nitride layer covering the surface and filling the gate recess. The top surface is planarized exposing the pad oxide layer. An additional oxide layer is grown causing the pad oxide layer to thicken. A portion of the silicon nitride layer is etched away and additional oxide layer is again grown causing the pad oxide layer to further thicken.
    Type: Application
    Filed: February 5, 2002
    Publication date: July 18, 2002
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING LTD.
    Inventors: Sneedharan Pillai Sneelal, Francis Yong Wee Poh, James Yong Meng Lee, Alex See, C.K. Lau, Ganesh Shankar Samudra
  • Patent number: 6417054
    Abstract: A method for a self aligned TX with elevated source/drain (S/D) regions on an insulated layer (oxide) by forming a trench along side the STI and filling the trench with oxide. STI regions are formed in a substrate. A gate structure is formed. LDD regions are formed adjacent to the gate structure in the substrate. Spacers are formed on the sidewall of the gate structure. We etch S/D trenches between the STI regions and the first spacers. The S/D trenches are filled with a S/D insulating layer. Elevated S/D regions are formed over the S/D insulating layer and the LDD regions. A top isolation layer is formed over the STI regions. The invention builds the raised source/drain (S/D) regions on an insulating layer and reduces junction leakage and hot carrier degradation to gate oxide.
    Type: Grant
    Filed: January 26, 2001
    Date of Patent: July 9, 2002
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Jia Zhen Zheng, Lap Chan, Elgin Quek, Ravi Sundaresan, Yang Pan, James Yong Meng Lee, Ying Keung Leung, Yelehanka Ramachandramurthy Pradeep
  • Patent number: 6417056
    Abstract: A method for forming a transistor having low overlap capacitance by forming a microtrench at the gate edge to reduce effective dielectric constant is described. A gate electrode is provided overlying a gate dielectric layer on a substrate and having a hard mask layer thereover. An oxide layer is formed overlying the substrate. First spacers are formed on sidewalls of the gate electrode and overlying the oxide layer. Source/drain extensions are implanted. Second spacers are formed on the first spacers. Source/drain regions are implanted. A dielectric layer is deposited overlying the gate electrode and the oxide layer and planarized to the hard mask layer whereby the first and second spacers are exposed. The exposed second spacers and underlying oxide layer are removed. The exposed substrate underlying the second spacers is etched into to form a microtrench undercutting the gate oxide layer at an edge of the gate electrode.
    Type: Grant
    Filed: October 18, 2001
    Date of Patent: July 9, 2002
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Elgin Quek, Ravi Sundaresan, Yang Pan, James Yong Meng Lee, Ying Keung Leung, Yelehanka Ramachandramurthy Pradeep, Jia Zhen Zheng, Lap Chan
  • Patent number: 6406945
    Abstract: A method for forming a gate dielectric having regions with different dielectric constants. A dummy dielectric layer is formed over a semiconductor structure. The dummy dielectric layer is patterned to form a gate opening. A high-K dielectric layer is formed over the dummy dielectric and in the gate opening. A low-K dielectric layer is formed on the high-K dielectric layer. Spacers are formed on the low-K dielectric layer at the edges of the gate opening. The low-K dielectric layer is removed from the bottom of the gate opening between the spacers. The spacers are removed to form a stepped gate opening. The stepped gate opening has both a high-K dielectric layer and a low-K dielectric layer on the sidewalls and at the edges of the bottom of the gate opening and only a high-k dielectric layer in the center of the bottom of the stepped gate opening. A gate electrode is formed in the stepped gate opening.
    Type: Grant
    Filed: January 26, 2001
    Date of Patent: June 18, 2002
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: James Yong Meng Lee, Ying Keung Leung, Yelehanka Ramachandramurthy Pradeep, Jia Zhen Zheng, Lap Chan, Elgin Quek, Ravi Sundaresan, Yang Pan
  • Patent number: 6403485
    Abstract: A method of forming a pseudo-SOI device having elevated source/drain (S/D) regions that can be extended for use as local interconnect is described. Shallow trench isolation (STI) regions separating adjacent active regions are provided within a semiconductor substrate. Polysilicon gate electrodes and associated SID extensions are fabricated in and on the substrate in the active regions wherein a hard mask layer overlies each of the gate electrodes. Dielectric spacers are formed on sidewalls of each of the gate electrodes. A polysilicon layer is deposited overlying the gate electrodes and the substrate. The polysilicon layer is polished back with a polish stop at the hard mask layer. The polysilicon layer is etched back whereby the polysilicon layer is recessed with respect to the gate electrodes. Thereafter, the polysilicon layer is etched away overlying the STI regions where a separation between adjacent active areas is desired.
    Type: Grant
    Filed: May 2, 2001
    Date of Patent: June 11, 2002
    Assignee: Chartered Semiconductor Manufacturing Ltd
    Inventors: Elgin Quek, Ravi Sundaresan, Yang Pan, James Lee Yong Meng, Ying Keung, Yelehanka Ramachandramurthy Pradeep, Jia Zhen Zheng, Lap Chan
  • Patent number: 6391720
    Abstract: A method for forming a self-aligned, recessed channel, MOSFET device that alleviates the problems due to short channel and hot carrier effects while reducing inter-electrode capacitance is described. A substrate with an active area encompassed by a shallow trench isolation (STI) region is provided. A mask oxide layer is then patterned and etched to expose the substrate and a portion of the STI region. The surface is etched and the mask oxide layer is eroded away while creating a gate recess in the unmasked area. A thin pad oxide layer is then grown overlying the surface followed by a deposition of a thick silicon nitride layer covering the surface and filling the gate recess. The top surface is planarized exposing the pad oxide layer. An additional oxide layer is grown causing the pad oxide layer to thicken. A portion of the silicon nitride layer is etched away and additional oxide layer is again grown causing the pad oxide layer to further thicken.
    Type: Grant
    Filed: September 27, 2000
    Date of Patent: May 21, 2002
    Assignees: Chartered Semiconductor Manufacturing Ltd., National University of Singapore
    Inventors: Sneedharan Pillai Sneelal, Francis Youg Wee Poh, James Yong Meng Lee, Alex See, C. K. Lau, Ganesh Shankar Samudra
  • Patent number: 6380088
    Abstract: An improved MOS transistor and method of making an improved MOS transistor. An MOS transistor having a recessed source drain on a trench sidewall with a replacement gate technique. Holes are formed in the shallow trench isolations, which exposes sidewall of the substrate in the active area. Sidewalls of the substrate are doped in the active area where holes are. Conductive material is then formed in the holes and the conductive material becomes the source and drain regions. The etch stop layer is then removed exposing sidewalls of the conductive material, and oxidizing exposed sidewalls of the conductive material is preformed. Spacers are formed on top of the pad oxide and on the sidewalls of the oxidized portions of the conductive material. The pad oxide layer is removed from the structure but not from under the spacers. A gate dielectric layer is formed on the substrate in the active area between the spacers; and a gate electrode is formed on said gate dielectric layer.
    Type: Grant
    Filed: January 19, 2001
    Date of Patent: April 30, 2002
    Assignee: Chartered Semiconductor Manufacturing, Inc.
    Inventors: Lap Chan, Elgin Quek, Ravi Sundaresan, Yang Pan, James Yong Meng Lee, Ying Keung Leung, Yelehanka Ramachandramurthy Pradeep, Jia Zhen Zheng
  • Patent number: 6372569
    Abstract: A method of selective formation of SiN layer in a semiconductor device comprising the following steps. A semiconductor structure having at least one PMOS transistor and one NMOS transistor formed therein is provided. The PMOS and NMOS transistors each have source/drain regions, a gate, and salicide contact regions. An undoped silicate glass (USG) layer is deposited over the semiconductor structure and the PMOS and NMOS transistors. An H2-rich PECVD silicon nitride layer is deposited over the undoped silicate glass layer and over the PMOS and NMOS transistors. The H2-rich PECVD silicon nitride layer is patterned, etched, and removed from over the PMOS transistor. An inter-level dielectric (ILD) layer is formed over the structure. The ILD layer is densified whereby hydrogen diffuses from the H2-rich PECVD silicon nitride layer overlying the NMOS transistor into the source/drain of the NMOS transistor.
    Type: Grant
    Filed: January 18, 2000
    Date of Patent: April 16, 2002
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Yong Meng Lee, Gao Feng, Yunqzang Zhang, Ravi Sundaresan
  • Patent number: 6313008
    Abstract: The invention describes three embodiments of methods for forming a balloon shaped STI trench. The first embodiment begins by forming a barrier layer over a substrate. An isolation opening is formed in the barrier layer. Next, ions are implanted into said substrate through said isolation opening to form a Si damaged or doped first region. The first region is selectively etching to form a hole. The hole is filled with an insulating material to form a balloon shaped shallow trench isolation (STI) region. The substrate has active areas between said balloon shaped shallow trench isolation (STI) regions. The second embodiment differs from the first embodiment by forming a trench in the substrate before the implant. The third embodiment forms a liner in the trench before an isotropic etch of the substrate through the trench.
    Type: Grant
    Filed: January 25, 2001
    Date of Patent: November 6, 2001
    Assignee: Chartered Semiconductor Manufacturing Inc.
    Inventors: Ying Keung Leung, Yelehanka Ramachandramurthy Pradeep, Jia Zhen Zheng, Lap Chan, Elgin Quek, Ravi Sundaresan, Yang Pan, James Yong Meng Lee
  • Patent number: 6306741
    Abstract: A buffer layer and a gate dielectric layer overlying a substrate having at least one active area is provided. A sacrificial oxide layer is formed over the gate dielectric layer. A nitride layer is formed over the sacrificial oxide layer. The nitride layer is patterned to form an opening therein within the active area exposing a portion of the sacrificial oxide layer within the opening. The portion of the sacrificial oxide layer within the opening is stripped, exposing a portion of the underlying gate dielectric layer within the opening. A gate electrode is formed within opening over the portion of the gate dielectric layer. The remaining nitride layer is selectively removed. The remaining sacrificial oxide layer is then stripped and removed.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: October 23, 2001
    Assignee: Chartered Semiconductor Manufacturing, Inc.
    Inventors: James Yong Meng Lee, Xia Li, Yun Qiang Zhang
  • Patent number: 6306715
    Abstract: A method to form a MOS transistor with a narrow channel regions and a wide top (second) gate portion. A gate dielectic layer and a first gate layer are formed over a substrate. A second gate portion is formed over the first gate layer. Spacers are formed on the sidewalls of the second gate portion. In a critical step, we isotropically etch the first gate layer to undercut the second gate portion to form a first gate portion so that the first portion has a width less than the second gate portion. The spacers are removed. Lightly doped drains, sidewall spacers and source/drain regions are formed to complete the device.
    Type: Grant
    Filed: January 8, 2001
    Date of Patent: October 23, 2001
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Lap Chan, Elgin Quek, Ravi Sundaresan, Yang Pan, James Yong Meng Lee, Ying Keung Leung, Yelehanka Ramachandramurthy Pradeep, Jia Zhen Zheng
  • Patent number: 6303449
    Abstract: A method of manufacturing a self aligned elevated source/drain (S/D). A first insulating layer is formed over a substrate. The first insulating layer having at least a gate opening and source/drain (S/D) openings adjacent to the gate opening. Spacer portions of the first insulating layer define the gate opening. A gate dielectric layer is formed over the substrate in the gate opening. A conductive layer is formed over the substrate. The conductive layer fills the gate opening and the source/drain (S/D) openings. The conductive layer is doped with dopants. The conductive layer is planarized to form a gate over the gate dielectric layer and filling the gate opening and filling the source/drain (S/D) opening to form elevated source/drain (S/D) regions. The conductive layer is preferably planarized so that the top surface of the conductive layer is level with the top surface of the first insulating layer. The spacer portions are removed to form spacer openings.
    Type: Grant
    Filed: November 16, 2000
    Date of Patent: October 16, 2001
    Assignee: Chartered Semiconductor Manufacturing Inc.
    Inventors: Yang Pan, James Yong Meng Lee, Ying Keung Leung, Yelehanka Ramachandramurthy Pradeep, Jia Zhen Zheng, Lap Chan, Elgin Kiok Boone Quek, Ravi Sundaresan
  • Patent number: 6300177
    Abstract: A method of forming a gate electrode, comprising the following steps. A semiconductor substrate having an overlying patterned layer exposing a portion of the substrate within active area and patterned layer opening. The patterned layer having exposed sidewalls. Internal spacers are formed over a portion of the exposed substrate portion within the patterned layer opening on the patterned layer exposed sidewalls. The internal spacers being comprised of a WF1 material having a first work function. A planarized gate electrode body is formed within the remaining portion of the patterned layer opening and adjacent to the internal spacers. The gate electrode body being comprised of a WF2 material having a second work function. The internal spacers and the gate electrode body forming the gate electrode.
    Type: Grant
    Filed: January 25, 2001
    Date of Patent: October 9, 2001
    Assignee: Chartered Semiconductor Manufacturing Inc.
    Inventors: Ravi Sundaresan, Yang Pan, James Yong Meng Lee, Ying Keung Leung, Yelehanka Ramachandramurthy Pradeep, Jia Zhen Zheng, Lap Chan, Elgin Quek
  • Patent number: 6258648
    Abstract: A new method of forming selective salicide structures is described whereby robust salicide structures are formed on exposed logic FET's, while blocking salicide formation on memory FET's. Thus, yielding logic FET's with robust salicide structures which exhibit low sheet rho lines and contacts, while blocking salicide formation on the sensitive memory FET's which operate at low voltage and have low leakage, shallow junctions. A conformal layer of thick silicon nitride in conjunction with a salicide blockout mask forms robust selective salicide structures. These structures exhibit low leakage and lack leakage problems caused by bridging, silicide ribbons or stringers.
    Type: Grant
    Filed: February 8, 1999
    Date of Patent: July 10, 2001
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventor: Yong Meng Lee
  • Patent number: 6197691
    Abstract: A new method of forming shallow trench isolations has been achieved. A semiconductor substrate is provided. A first etch stop layer is deposited. The first etch stop layer and the semiconductor substrate are etched to form trenches. A gap fill layer of high density plasma oxide is deposited overlying the first etch stop layer and filling the trenches. The deposition of the gap fill layer is stopped before the planar top surface of the gap fill layer overlying the trenches reaches the level of the top surface of the first etch stop layer bordering the trenches. The gap fill layer is etched so that the gap fill layer overlying the trenches does not contact the gap fill layer overlying the first etch stop layer. A second etch stop layer is deposited. The deposition of the second etch stop layer is stopped before the planar top surface of the second etch stop layer overlying the trenches reaches the level of the top surface of the first etch stop layer.
    Type: Grant
    Filed: November 15, 1999
    Date of Patent: March 6, 2001
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventor: James Yong Meng Lee
  • Patent number: 6107140
    Abstract: A method of patterning a gate electrode comprising the following steps. A semiconductor structure, with an upper silicon layer, and having an active area is provided. A sacrificial oxide layer overlies the semiconductor structure, a first polysilicon layer overlies the sacrificial silicon oxide layer, and a silicon nitride layer overlies the polysilicon layer. The nitride, first poly, and sacrificial oxide layers are patterned to form a gate conductor opening within the active area. A gate oxide layer is grown over the semiconductor structure within the gate conductor opening an oxide sidewall spacers are grown on the first polysilicon sidewalls. A second polysilicon layer is deposited over the structure, filling the gate conductor opening. The second polysilicon layer is polished to remove the excess of the second polysilicon layer from the nitride layer, forming a polysilicon gate conductor within the gate conductor opening and over the gate oxide layer.
    Type: Grant
    Filed: December 20, 1999
    Date of Patent: August 22, 2000
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Yong Meng Lee, Yunqiang Zhang
  • Patent number: 6025267
    Abstract: A method for forming self-aligned, metal silicide, (salicide), layers, on polysilicon gate structures, and on source/drain regions, located in a first region of a semiconductor substrate, while avoiding the salicide formation, on polysilicon gate structures, and on source/drain regions, located in a second region of a semiconductor substrate, has been developed. A composite insulator shape, comprising an overlying silicon nitride layer, and an underlying TEOS deposited, silicon oxide layer, is used to block polysilicon, as well as silicon regions, in the second region of the semiconductor substrate, from salicide formation. Unwanted silicon oxide spacers, created on the sides of polysilicon gate structures, during the patterning of the composite insulator shape, is selectively removed using dilute hydrofluoric acid solutions.
    Type: Grant
    Filed: July 15, 1998
    Date of Patent: February 15, 2000
    Assignee: Chartered Semiconductor Manufacturing, Ltd.
    Inventors: Kin-Leong Pey, Soh-Yun Siah, Yong-Meng Lee