Patents by Inventor Purakh Verma

Purakh Verma 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: 20080087958
    Abstract: A semiconductor device provides a substrate having a first region and a second region. A sacrificial first gate is formed in the first region. Source/drain are formed in the first region. A second region gate dielectric is formed in the second region. A second region gate is formed on the second region gate dielectric. A second region source/drain is formed in the second region. A sacrificial layer is formed over the sacrificial first gate, the source/drain, the first region, and the second region. The sacrificial first gate is exposed. A gate space is formed by removing the sacrificial first gate. A first region gate dielectric is formed in the gate space. A first region gate is formed on the first region gate dielectric. The sacrificial layer is removed.
    Type: Application
    Filed: December 6, 2007
    Publication date: April 17, 2008
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING LTD.
    Inventors: Purakh Verma, Liang-Choo Hsia, Dong Kyun Sohn, Guowei Zhang, Chew Hoe Ang, Yun Ling Tan, Zhao Lun, Jae Gon Lee, Yung Fu Chong
  • Patent number: 7323736
    Abstract: A new method of provided for forming in one plane layers of semiconductor material having both high and low dielectric constants. Layers, having selected and preferably non-identical parameters of dielectric constants, are successively deposited interspersed with layers of etch stop material. The layers can be etched, creating openings there-through that can be filled with a layer of choice.
    Type: Grant
    Filed: May 22, 2006
    Date of Patent: January 29, 2008
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Pradeep Yelehanka, Sanford Chu, Chit Hwei Ng, Jia Zhen, Purakh Verma
  • Patent number: 7250669
    Abstract: A first method of reducing semiconductor device substrate effects comprising the following steps. O+or O2+are selectively implanted into a silicon substrate to form a silicon-damaged silicon oxide region. One or more devices are formed over the silicon substrate proximate the silicon-damaged silicon oxide region within at least one upper dielectric layer. A passivation layer is formed over the at least one upper dielectric layer. The passivation layer and the at least one upper dielectric layer are patterned to form a trench exposing a portion of the silicon substrate over the silicon-damaged silicon oxide region. The silicon-damaged silicon oxide region is selectively etched to form a channel continuous and contiguous with the trench whereby the channel reduces the substrate effects of the one or more semiconductor devices.
    Type: Grant
    Filed: August 2, 2004
    Date of Patent: July 31, 2007
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Lap Chan, Sanford Chu, Chit Hwei Ng, Purakh Verma, Jia Zhen Zheng, Johnny Chew, Choon Beng Sia
  • Publication number: 20070134854
    Abstract: A structure and a process for a self-aligned vertical PNP transistor for high performance SiGe CBiCMOS process. Embodiments include SiGe CBiCMOS with high-performance SiGe NPN transistors and PNP transistors. As the PNP transistors and NPN transistors contained different types of impurity profile, they need separate lithography and doping step for each transistor. The process is easy to integrate with existing CMOS process to save manufacturing time and cost. As plug-in module, fully integration with SiGe BiCMOS processes. High doping Polysilicon Emitter can increase hole injection efficiency from emitter to base, reduce emitter resistor, and form very shallow EB junction. Self-aligned N+ base implant can reduce base resistor and parasitical EB capacitor. Very low collector resistor benefits from BP layer. PNP transistor can be Isolated from other CMOS and NPN devices by BNwell, Nwell and BN+ junction.
    Type: Application
    Filed: December 13, 2005
    Publication date: June 14, 2007
    Inventors: Shaoqiang Zhang, Purakh Verma, Sanford Chu
  • Publication number: 20060252188
    Abstract: A method and apparatus for manufacturing a semiconductor device is provides a substrate having a first region and a second region. A sacrificial first gate is formed in the first region. Source/drain are formed in the first region. A second region gate dielectric is formed in the second region. A second region gate is formed on the second region gate dielectric. A second region source/drain is formed in the second region. A sacrificial layer is formed over the sacrificial first gate, the source/drain, the first region, and the second region. The sacrificial first gate is exposed. A gate space is formed by removing the sacrificial first gate. A first region gate dielectric is formed in the gate space. A first region gate is formed on the first region gate dielectric. The sacrificial layer is removed.
    Type: Application
    Filed: May 6, 2005
    Publication date: November 9, 2006
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING, LTD.
    Inventors: Purakh Verma, Liang-Choo Hsia, Dong Kyun Sohn, Guowei Zhang, Chew Hoe Ang, Yun Ling Tan, Zhao Lun, Jae Gon Lee, Yung Fu Chong
  • Publication number: 20060207965
    Abstract: A new method of provided for forming in one plane layers of semiconductor material having both high and low dielectric constants. Layers, having selected and preferably non-identical parameters of dielectric constants, are successively deposited interspersed with layers of etch stop material. The layers can be etched, creating openings there-through that can be filled with a a layer of choice.
    Type: Application
    Filed: May 22, 2006
    Publication date: September 21, 2006
    Inventors: Yelehanka Ramaghandramurthy Pradeep, Sanford Chu, Chit Hwei Ng, Jia Zheng, Purakh Verma
  • Patent number: 7060193
    Abstract: A new method of provided for forming in one plane layers of semiconductor material having both high and low dielectric constants. Layers, having selected and preferably non-identical parameters of dielectric constants, are successively deposited interspersed with layers of etch stop material. The layers can be etched, creating openings there-through that can be filled with a layer of choice.
    Type: Grant
    Filed: July 5, 2002
    Date of Patent: June 13, 2006
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Pradeep Yelehanka, Sanford Chu, Chit Hwei Ng, Jia Zhen, Purakh Verma
  • Publication number: 20050196931
    Abstract: A lateral heterojunction bipolar transistor (HBT), comprising a semiconductor substrate having having a first insulating layer over the semiconductor substrate. A base trench is formed in a first silicon layer over the first insulating layer to form a collector layer over an exposed portion of the semiconductor substrate and an emitter layer over the first insulating layer. A semiconductive layer is formed on the sidewalls of the base trench to form a collector structure in contact with the collector layer and an emitter structure in contact with the emitter layer. A base structure is formed in the base trench. A plurality of connections is formed through an interlevel dielectric layer to the collector layer, the emitter layer, and the base structure. The base structure preferably is a compound semiconductive material of silicon and at least one of silicon-germanium, silicon-germanium-carbon, and combinations thereof.
    Type: Application
    Filed: May 4, 2005
    Publication date: September 8, 2005
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING, LTD.
    Inventors: Jian Li, Lap Chan, Purakh Verma, Jia Zheng, Shao-fu Chu
  • Publication number: 20050170580
    Abstract: A bipolar transistor, with a substrate having a collector region and a base structure provided thereon. An emitter structure is formed over the base structure and an extrinsic base structure is formed over the base structure and over the collector region beside and spaced from the emitter structure. A dielectric layer is deposited over the substrate and connections are formed to the extrinsic base structure, the emitter structure and the collector region.
    Type: Application
    Filed: February 12, 2005
    Publication date: August 4, 2005
    Applicant: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Purakh Verma, Shao-fu Chu
  • Publication number: 20050145953
    Abstract: A method of manufacturing a BiCMOS integrated circuit including a CMOS transistor having a gate structure, and a heterojunction bipolar transistor having an extrinsic base structure. A substrate is provided, and a polysilicon layer is formed over the substrate. The gate structure and the extrinsic base structure are formed in the polysilicon layer. A plurality of contacts is formed through the interlevel dielectric layer to the CMOS transistor and the heterojunction bipolar transistor.
    Type: Application
    Filed: January 5, 2004
    Publication date: July 7, 2005
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING LTD
    Inventors: Lap Chan, Jia Zheng, Purakh Verma, Jian Li, Shao-fu Chu
  • Publication number: 20050124131
    Abstract: A method is described to fabricate RF inductor devices on a silicon substrate. Low-k or other dielectric material is deposited and patterned to form inductor lower plate trenches. Trenches are lined with barrier film such as TaN, filled with copper, and excess metal planarized using chemical mechanical polishing (CMP). Second layer of a dielectric material is deposited and patterned to form via-hole/trenches. Via-hole/trench patterns are filled with barrier material, and the dielectric film in between the via-hole/trenches is etched to form a second set of trenches. These trenches are filled with copper and planarized. A third layer of a dielectric film is deposited and patterned to form via-hole/trenches. Via-hole/trenches are then filled with barrier material, and the dielectric film between via-hole/trench patterns etched to form a third set of trenches. These trenches are filled with copper metal and excess metal removed by CMP to form said RF inductor.
    Type: Application
    Filed: January 13, 2005
    Publication date: June 9, 2005
    Inventors: Chit Hweing, Lap Chan, Purakh Verma, Yelehanka Ramachandramurthy Pradeep, Sanford Chu
  • Publication number: 20050116254
    Abstract: A method for manufacturing a heterojunction bipolar transistor is provided. An intrinsic collector structure is formed on a substrate. An extrinsic base structure partially overlaps the intrinsic collector structure. An intrinsic base structure is formed adjacent the intrinsic collector structure and under the extrinsic base structure. An emitter structure is formed adjacent the intrinsic base structure. An extrinsic collector structure is formed adjacent the intrinsic collector structure. A plurality of contacts is formed through an interlevel dielectric layer to the extrinsic collector structure, the extrinsic base structure, and the emitter structure.
    Type: Application
    Filed: December 1, 2003
    Publication date: June 2, 2005
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING LTD.
    Inventors: Purakh Verma, Shao-Fu Chu, Lap Chan, Jia Zheng, Jian Li
  • Publication number: 20050101096
    Abstract: A method for manufacturing a lateral heterojunction bipolar transistor (HBT) is provided comprising a semiconductor substrate having a first insulating layer over the semiconductor substrate. A base trench is formed in a first silicon layer over the first insulating layer to form a collector layer over an exposed portion of the semiconductor substrate and an emitter layer over the first insulating layer. A semiconductive layer is formed on the sidewalls of the base trench to form a collector structure in contact with the collector layer and an emitter structure in contact with the emitter layer. A base structure is formed in the base trench. A plurality of connections is formed through an interlevel dielectric layer to the collector layer, the emitter layer, and the base structure. The base structure preferably is a compound semiconductive material of silicon and at least one of silicon-germanium, silicon-germanium-carbon, and combinations thereof.
    Type: Application
    Filed: November 6, 2003
    Publication date: May 12, 2005
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING LTD.
    Inventors: Jian Li, Lap Chan, Purakh Verma, Jia Zheng, Shao-Fu Chu
  • Publication number: 20050101038
    Abstract: A heterojunction bipolar transistor (HBT), and manufacturing method therefor, comprising a semiconductor substrate having a collector region, a number of insulating layers over the semiconductor substrate, at least one of the number of insulating layers having a base cavity over the collector region, a base structure of a compound semiconductive material in the base cavity, a window in the insulating layer over the base cavity, an emitter structure in the window, an interlevel dielectric layer, and connections through the interlevel dielectric layer to the base structure, the emitter structure, and the collector region. The base structure and the emitter structure preferably are formed in the same processing chamber.
    Type: Application
    Filed: November 6, 2003
    Publication date: May 12, 2005
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING LTD.
    Inventors: Purakh Verma, Shao-Fu Chu, Lap Chan, Jian Li, Jia Zheng
  • Publication number: 20050086780
    Abstract: A method of forming a capacitor comprising the following steps. A substrate having a lower low-k dielectric layer formed thereover is provided with the lower low-k dielectric layer having a dielectric constant of less than about 3.0. Metal vertical electrode plates are formed within the lower low-k dielectric layer so that the adjacent metal vertical electrode plates have lower low-k dielectric layer portions therebetween. The lower low-k dielectric layer portions between the adjacent metal vertical electrode plates are replaced with high-k dielectric material trench portions having a dielectric constant of greater than about 3.0.
    Type: Application
    Filed: October 23, 2003
    Publication date: April 28, 2005
    Inventors: Kai Shao, Chit Ng, Purakh Verma, Jia Zheng, Sanford Chu
  • Publication number: 20050079658
    Abstract: A heterojunction bipolar transistor (HBT), and manufacturing method therfor, comprising a semiconductor substrate having a collector region is provided. A base contact layer is formed over the collector region, and a base trench is formed in the base contact layer and the collector region. An intrinsic base structure having a sidewall portion and a bottom portion is formed in the base trench. An insulating spacer is formed over the sidewall portion of the intrinsic base structure, and an emitter structure is formed over the insulating spacer and the bottom portion of the intrinsic base structure. An interlevel dielectric layer is formed over the base contact layer and the emitter structure. Connections are formed through the interlevel dielectric layer to the collector region, the base contact layer, and the emitter structure. The intrinsic base structure is silicon and at least one of silicon-germanium, silicon-germanium-carbon, and combinations thereof.
    Type: Application
    Filed: October 9, 2003
    Publication date: April 14, 2005
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING, LTD.
    Inventors: Jian Li, Lap Chan, Purakh Verma, Jia Zheng, Shao-Fu Chu
  • Publication number: 20050079678
    Abstract: A heterojunction bipolar transistor (HBT), and manufacturing method therefor, comprising a semiconductor substrate having a collector region, an intrinsic base region of a compound semiconductive material over the collector region, an extrinsic base region, an emitter structure, an interlevel dielectric layer over the collector region, extrinsic base region and emitter structure, and connections through the interlevel dielectric layer to the base region, the emitter structure, and the collector region. The emitter structure is formed by forming a reverse emitter window over the intrinsic base region, which subsequently is etched to form an emitter window having a multi-layer reverse insulating spacer therein.
    Type: Application
    Filed: October 9, 2003
    Publication date: April 14, 2005
    Applicant: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Purakh Verma, Shao-Fu Chu, Lap Chan, Jian Li, Jia Zheng
  • Patent number: 6869884
    Abstract: A first method of reducing semiconductor device substrate effects comprising the following steps. O+ or O2+ are selectively implanted into a silicon substrate to form a silicon-damaged silicon oxide region. One or more devices are formed over the silicon substrate proximate the silicon-damaged silicon oxide region within at least one upper dielectric layer. A passivation layer is formed over the at least one upper dielectric layer. The passivation layer and the at least one upper dielectric layer are patterned to form a trench exposing a portion of the silicon substrate over the silicon-damaged silicon oxide region. The silicon-damaged silicon oxide region is selectively etched to form a channel continuous and contiguous with the trench whereby the channel reduces the substrate effects of the one or more semiconductor devices.
    Type: Grant
    Filed: August 22, 2002
    Date of Patent: March 22, 2005
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Lap Chan, Sanford Chu, Chit Hwei Ng, Purakh Verma, Jia Zhen Zheng, Johnny Chew, Choon Beng Sia
  • Publication number: 20050059216
    Abstract: A CMOS RF device and a method to fabricate said device with low gate contact resistance are described. Conventional MOS transistor is first formed with isolation regions, poly-silicon gate structure, sidewall spacers around poly gate, and implanted source/drain with lightly and heavily doped regions. A silicon dioxide layer such as TEOS is deposited, planarized with chemical mechanical polishing (CMP) to expose the gate and treated with dilute HF etchant to recess the silicon dioxide layer below the surface of the gate. Silicon nitride is then deposited and planarized with CMP and then etched except around the gates, using a oversize poly-silicon gate mask. Inter-level dielectric mask is then deposited, contact holes etched, and contact metal is deposited to form the transistor. During contact hole etch over poly-silicon gate, silicon nitride around the poly gate acts as an etch stop.
    Type: Application
    Filed: September 17, 2003
    Publication date: March 17, 2005
    Inventors: Purakh Verma, Sanford Chu, Lap Chan, Yelehanka Ramachandramurthy Pradeep, Kai Shao, Jia Zheng
  • Patent number: 6852605
    Abstract: A method is described to fabricate RF inductor devices on a silicon substrate. Low-k or other dielectric material is deposited and patterned to form inductor lower plate trenches. Trenches are lined with barrier film such as TaN, filled with copper, and excess metal planarized using chemical mechanical polishing (CMP). Second layer of a dielectric material is deposited and patterned to form via-hole/trenches. Via-hole/trench patterns are filled with barrier material, and the dielectric film in between the via-hole/trenches is etched to form a second set of trenches. These trenches are filled with copper and planarized. A third layer of a dielectric film is deposited and patterned to form via-hole/trenches. Via-hole/trenches are then filled with barrier material, and the dielectric film between via-hole/trench patterns etched to form a third set of trenches. These trenches are filled with copper metal and excess metal removed by CMP to form said RF inductor.
    Type: Grant
    Filed: May 1, 2003
    Date of Patent: February 8, 2005
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Chit Hwei Ng, Lap Chan, Purakh Verma, Yelehanka Ramachandramurthy Pradeep, Sanford Chu