Abstract:
A method includes receiving an input signal representative of a desired two-dimensional non-uniform dose pattern for a front surface of a workpiece, driving the workpiece relative to an ion beam to distribute the ion beam across the front surface of the workpiece, and controlling at least one parameter of an ion impianter when the ion beam is incident on the front surface of the workpiece to directly create the desired two-dimensional non-uniform dose pattern in one pass of the front surface of workpiece relative to the ion beam. The beam may be a scanned beam or a ribbon beam. An ion impianter is also provided.
Abstract:
A method for plasma ion implantation of a substrate includes providing a plasma ion implantation system including a process chamber, a source for producing a plasma in the process chamber, a platen for holding the substrate in the process chamber, and a voltage source for accelerating ions from the plasma into the substrate, depositing on interior surfaces of the process chamber a fresh coating that is similar in composition to a deposited film that results from plasma ion implantation of the substrate, before depositing the fresh coating, cleaning interior surfaces of the process chamber by removing an old film using one or more activated cleaning precursors, plasma ion implantation of the substrate according to a plasma ion implantation process, and repeating the steps of cleaning interior surfaces of the process chamber and depositing a fresh coating following plasma ion implantation of one or more substrates.
Abstract:
A method for plasma ion implantation of a substrate includes providing a plasma ion implantation system including a process chamber, a source for producing a plasma in the process chamber, a platen for holding the substrate in the process chamber, and a voltage source for accelerating ions from the plasma into the substrate, depositing on interior surfaces of the process chamber a fresh coating that is similar in composition to a deposited film that results from plasma ion implantation of the substrate, before depositing the fresh coating, cleaning interior surfaces of the process chamber by removing an old film using one or more activated cleaning precursors, plasma ion implantation of the substrate according to a plasma ion implantation process, and repeating the steps of cleaning interior surfaces of the process chamber and depositing a fresh coating following plasma ion implantation of one or more substrates.
Abstract:
A method for plasma ion implantation of a substrate includes providing a plasma ion implantation system having a process chamber, a source for producing a plasma in the process chamber, a platen for holding a substrate in the process chamber, an anode spaced from the platen, and a pulse source for generating implant pulses for accelerating ions from the plasma into the substrate. In one aspect, a parameter of an implant process is varied to at least partially compensate for undesired effects of interaction between ions being implanted and the substrate. For example, dose rate, ion energy, or both may be varied during the implant process. In another aspect, a pretreatment step includes accelerating ions from the plasma to the anode to cause emission of secondary electrons from the anode, and accelerating the secondary electrons from the anode to a substrate for pretreatment of the substrate.
Abstract:
Systems and methods for manufacturing a vacuum device, such as an electron emitter, that includes a foil exit window placed over and joined to a support grid. In one particular method, the vacuum chamber of an election emitter has a thin foil forming an exit window at one end. The thin foil may be titanium or any suitable material and the foil will typically enlarge during a bonding process that attaches the foil to the support grid. In one manufacturing process, the support grid is provided with a surface that has contours, typically being smooth recessed surfaces, that the foil, once enlarged, can lie against as the vacuum pulls the foil against the grid.
Abstract:
Techniques for detecting wafer charging in a plasma processing system are disclosed. In one particular exemplary embodiment, the techniques may be realized as an apparatus for detecting wafer charging in a plasma processing system. The apparatus may comprise a plasma chamber to produce a plasma discharge above a wafer in the plasma chamber. The apparatus may also comprise a biasing circuit to bias the wafer to draw ions from the plasma discharge towards the wafer. The apparatus may further comprise a detection mechanism to detect charge buildup on the wafer by measuring an electric field in one or more designated locations near a top surface of the wafer.
Abstract:
A method includes receiving an input signal representative of a desired two-dimensional non-uniform dose pattern for a front surface of a workpiece, driving the workpiece relative to an ion beam to distribute the ion beam across the front surface of the workpiece, and controlling at least one parameter of an ion impianter when the ion beam is incident on the front surface of the workpiece to directly create the desired two-dimensional non-uniform dose pattern in one pass of the front surface of workpiece relative to the ion beam. The beam may be a scanned beam or a ribbon beam. An ion impianter is also provided.
Abstract:
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.
Abstract:
A method for plasma ion implantation of a substrate includes providing a plasma ion implantation system including a process chamber, a source for producing a plasma in the process chamber, a platen for holding the substrate in the process chamber, and a voltage source for accelerating ions from the plasma into the substrate, depositing on interior surfaces of the process chamber a fresh coating that is similar in composition to a deposited film that results from plasma ion implantation of the substrate, before depositing the fresh coating, cleaning interior surfaces of the process chamber by removing an old film using one or more activated cleaning precursors, plasma ion implantation of the substrate according to a plasma ion implantation process, and repeating the steps of cleaning interior surfaces of the process chamber and depositing a fresh coating following plasma ion implantation of one or more substrates.
Abstract:
An exit window (15) can include an exit window foil (12), and a support grid (13) contacting and supporting the exit window foil. The support grid can have first and second grids (16, 18), each having respective first and second grid portions (16c, 18c) that are positioned in an alignment and thermally isolated from each other, The first and second grid portions can each have a series of apertures (16a, 18a) that are aligned for allowing the passage of a beam (14) therethrough to reach and pass through the exit window foil (12). The second grid portion (18c) can contact the exit window foil. The first grid portion (16c) can mask the second grid portion (18c) and the exit window foil (12) from heat caused by the beam striking the first grid portion (16e).