Abstract:
A static random access memory cell is provided formed in a silicon layer over a buried oxide layer on a substrate and including first and second inverters each having a pull-up and pull-down transistor configured to form a cell node. Each of the pull-down transistors of the first and second inverters are formed over first regions below the buried oxide layer with the first regions having a first doping level forming first backgates for the pull-down transistors. A pair of passgate transistors respectively couples to the cell nodes of the first and second inverters and each are formed over second regions below the buried oxide layer with the second regions having a second doping level forming second backgates for the passgate transistors. Active bias circuitry applies potentials to the first and second backgates during read, standby and write operations of the static random access memory cell.
Abstract:
A static random access memory cell is provided that includes first and second inverters formed on a substrate each having a pull-up and pull-down transistor configured to form a cell node. Each of the pull-down transistors of the first and second inverters resides over first regions below the buried oxide layer and having a first doping level and applied bias providing a first voltage threshold for the pull-down transistors. A pair of passgate transistors is coupled the cell nodes of the first and second inverters, and each is formed over second regions below the buried oxide layer and having a second doping level and applied bias providing a second voltage threshold for the passgate transistors. The first voltage threshold differs from the second voltage threshold providing electrical voltage threshold control between the pull-down transistors and the passgate transistors.
Abstract:
A static random access memory cell is provided formed in a silicon layer over a buried oxide layer on a substrate and including first and second inverters each having a pull-up and pull-down transistor configured to form a cell node. Each of the pull-down transistors of the first and second inverters are formed over first regions below the buried oxide layer with the first regions having a first doping level forming first backgates for the pull-down transistors. A pair of passgate transistors respectively couples to the cell nodes of the first and second inverters and each are formed over second regions below the buried oxide layer with the second regions having a second doping level forming second backgates for the passgate transistors. Active bias circuitry applies potentials to the first and second backgates during read, standby and write operations of the static random access memory cell.
Abstract:
The present invention is directed to a semiconductor device having a gate electrode includes of a plurality of sidewalls, each having a recess formed therein. The present invention is also directed to a method of forming a semiconductor device. In one illustrative embodiment, the method comprises forming a layer of dopant material in a layer of polysilicon and etching the layer of polysilicon to define a gate electrode having a plurality of sidewalls, each of which have a recess formed therein.
Abstract:
A method is provided, the method including forming a gate dielectric above a surface of the substrate, forming the conductive gate structure above the gate dielectric, the conductive gate structure having an edge region, and forming a source/drain extension (SDE) adjacent the conductive gate structure. The method also includes forming a dopant-depleted-SDE region in the substrate under the edge region of the conductive gate structure.
Abstract:
A system and method for providing a memory cell on a semiconductor is disclosed. In one aspect, the method and system include providing at least one gate stack on the semiconductor, depositing at least one spacer, and providing at least one source implant in the semiconductor. The at least one gate stack has an edge. A portion of the at least one spacer is disposed along the edge of the at least one gate stack. In another aspect, the method and system include providing at least one gate stack on the semiconductor, providing a first junction implant in the semiconductor, depositing at least one spacer, and providing a second junction implant in the semiconductor after the at least one spacer is deposited. The at least one gate stack has an edge. A portion of the at least one spacer is disposed at the edge of the at least one gate stack. In a third aspect, the method and system include providing at least one gate stack on the semiconductor, providing at least one source implant in the semiconductor, depositing at least one spacer after the at least one source implant is provided, and providing at least one drain implant in the semiconductor after the spacer is deposited. The at least one gate has an edge. A portion of the at least one spacer is disposed along the edge of the at least one gate.
Abstract:
An interconnection level of conductive lines and connecting vias separated by insulation for integrated circuits and substrate carriers for semiconductor devices using dual damascene with only one mask pattern for the formation of both the conductive lines and vias. The mask pattern of conductive lines contains laterally enlarged areas where the via openings are to formed in the insulating material. After the conductive line openings with laterally enlarged areas are created, the openings are filled with a conformal material whose etch selectivity is substantially less than the etch selectivity of the insulating material to the enchant for etching the insulating material and whose etch selectivity is substantially greater than the insulating material to its enchant. The conformal material is anisotropically etched to form sidewalls in the enlarged area and remove the material between the sidewalls but leave material remaining in the parts of the conductive lines openings. The sidewalls serve as self aligned mask for etching via openings. The conformal material is either a conductive material which is left in place after the via openings are formed or an insulating material which is removed. In the former, the partially filled conductive line openings are filled with additional conductive material along with the via, which is either the same or different conductive material. In the latter, the conductive line openings and vias are filled with the same conductive material.
Abstract:
A static random access memory cell is provided that includes first and second inverters formed on a substrate each having a pull-up and pull-down transistor configured to form a cell node. Each of the pull-down transistors of the first and second inverters resides over first regions below the buried oxide layer and having a first doping level and applied bias providing a first voltage threshold for the pull-down transistors. A pair of passgate transistors is coupled the cell nodes of the first and second inverters, and each is formed over second regions below the buried oxide layer and having a second doping level and applied bias providing a second voltage threshold for the passgate transistors. The first voltage threshold differs from the second voltage threshold providing electrical voltage threshold control between the pull-down transistors and the passgate transistors.
Abstract:
A stress enhanced CMOS circuit and methods for its fabrication are provided. One fabrication method comprises the steps of forming an NMOS transistor and a PMOS transistor adjacent the NMOS transistor in a channel width direction, the PMOS transistor and the NMOS transistor separated by an isolation region. A compressive stress liner is deposited overlying the transistors and the isolation region and is etched to remove the compressive stress liner from the NMOS transistor and from a portion of the isolation region. A tensile stress liner is deposited overlying the transistors, the isolation region, and the compressive stress liner and is etched to remove a portion of the tensile stress liner overlying a portion of the compressive stress liner and to leave the tensile stress liner overlying the NMOS transistor, the isolation region, and a portion of the compressive stress liner.
Abstract:
A gate structure is formed overlying a substrate. A source/drain region of the substrate is exposed to a soluction comprising ammonium hydroxide, hydrogen peroxide, and deionized water to etch an upper-most semiconductor porton of the source/drain region.