摘要:
Methods and apparatus for plasma implantation of a workpiece, such as a semiconductor wafer, are provided. A method includes introducing into a plasma doping chamber a dopant gas selected from the group consisting of PF3, AsF3, AsF5 and mixtures thereof, forming in the plasma doping chamber a plasma containing ions of the dopant gas, the plasma having a plasma sheath at or near a surface of the workpiece, and accelerating the dopant gas ions across the plasma sheath toward the workpiece, wherein the dopant gas ions are implanted into the workpiece. The selected dopant gas limits deposition of neutral particles on the workpiece.
摘要:
A method for fabricating a semiconductor-based device includes providing a doped semiconductor substrate, introducing a second dopant into the substrate to define a pn junction, and introducing a neutralizing species into the substrate in the neighborhood of the pn junction to reduce a capacitance associated with the pn junction. A semiconductor-based device includes a semiconductor substrate having first and second dopants, and a neutralizing species. The first and second dopants define a pn junction, and the neutralizing species neutralizes a portion of the first dopant in the neighborhood of the pn junction to decrease a capacitance associated with the pn junction.
摘要:
A Faraday dose and uniformity monitor can include a magnetically suppressed annular Faraday cup surrounding a target wafer. A narrow aperture can reduce discharges within Faraday cup opening. The annular Faraday cup can have a continuous cross section to eliminate discharges due to breaks. A plurality of annular Faraday cups at different radii can independently measure current density to monitor changes in plasma uniformity. The magnetic suppression field can be configured to have a very rapid decrease in field strength with distance to minimize plasma and implant perturbations and can include both radial and azimuthal components, or primarily azimuthal components. The azimuthal field component can be generated by multiple vertically oriented magnets of alternating polarity, or by the use of a magnetic field coil. In addition, dose electronics can provide integration of pulsed current at high voltage, and can convert the integrated charge to a series of light pulses coupled optically to a dose controller.
摘要:
A method for fabricating a semiconductor-based device includes providing a substrate including a semiconductor layer, forming a gate dielectric layer on the semiconductor layer, forming a plasma including deuterium, plasma implanting deuterium from the plasma into the substrate, and annealing the substrate to promote passivation of the interface between the dielectric layer and the semiconductor layer.
摘要:
A system, method and program product for monitoring the beam angle integrity of an ion beam generated by an ion implanter system are disclosed. The invention utilizes at least one template with each template having a template surface that impedes the motion of an ion. Each template is configured such that an ion impacts the surface of the template if the trajectory of the template deviates from the optimum trajectory by a pre-determined maximum variance angle. The change caused by the impact of the ions with the template and/or a target is then measured to determine the amount of variance in the ion beam. Adjustments can then be made to the ion beam generator to correct for a misaligned beam.
摘要:
A system, method and program product for monitoring the beam angle integrity of an ion beam generated by an ion implanter system are disclosed. The invention utilizes at least one template with each template having a template surface that impedes the motion of an ion. Each template is configured such that an ion impacts the surface of the template if the trajectory of the template deviates from the optimum trajectory by a pre-determined maximum variance angle. The change caused by the impact of the ions with the template and/or a target is then measured to determine the amount of variance in the ion beam. Adjustments can then be made to the ion beam generator to correct for a misaligned beam.
摘要:
Methods and apparatus for plasma ion implantation with improved dopant profiles are provided. A plasma ion implantation system includes a process chamber, a plasma source to generate a plasma in the process chamber, a platen to hold the substrate in the process chamber and a pulse source to generate implant pulses to accelerate ions from the plasma into the substrate. In one aspect, the pulse source generates implant pulses having pulse widths that are sufficiently long to limit plasma ion implantation during a transient period at the start of each implant pulse to a small fraction of the total implanted dose. In another aspect, ions are generated in a region of the process chamber near a reference potential, such as ground, and are accelerated from the region of plasma generation to the platen. Plasma generation may be enabled after the start of each implant pulse and may be disabled before the end of each implant pulse.
摘要:
A system, method and program product for adjusting metal work function by ion implantation is disclosed. The invention determines the work function of the metal and determines a desired work function threshold for the metal. The desired work function threshold may be a range and is usually based on the work function of the substrate. An ion implanter system is then used to implant ions to at least a portion of the metal. The ion implantation is usually a high-energy ion stream including a material that is calculated to modify the work function of the metal. The ion implanter system continues to transmit the ion stream into the metal until the work function of the metal meets the desired work function threshold.
摘要:
Plasma ion implantation apparatus includes a process chamber, a platen located in the process chamber for supporting a substrate, a dopant source including a solid dopant element and a vaporizer to vaporize dopant material from the solid dopant element, a plasma source to produce a plasma containing ions of the dopant material, and an implant pulse source to apply implant pulses to the platen for accelerating the ions of the dopant material from the plasma into the substrate.
摘要:
A method for fabricating a semiconductor-based device includes disposing a substrate in a process chamber of a process tool, plasma implanting a dopant species from a plasma into a portion of the substrate in the process chamber, and plasma depositing a diffusion barrier on the implanted portion of the substrate prior to removing the at least one substrate from the process tool. The diffusion barrier can be deposited in the same chamber as that used for dopant implantation or a different chamber of the process tool.