Abstract:
A method for cleaning an ion implantation, comprising providing an ion implantation system, wherein the ion implantation system comprises one or more components having one or more contaminants disposed thereon. A process species is provided to the ion implantation system, wherein the process species is otherwise utilized to implant ions into a workpiece. Ions are formed from the process species, therein defining an ion source. An ion beam is then extracted from the ion source via an application of an extraction voltage to an ion extraction assembly associated with the ion source. The extraction voltage is further modulated, wherein a trajectory of the ion beam is oscillated within a predetermined range. The ion beam is consequently swept across the one or more components, thus substantially removing the one or more contaminants therefrom.
Abstract:
Dosimetry systems and methods are also presented for measuring a scanned ion beam at a plurality of points along a curvilinear path at a workpiece location in a process chamber. An illustrated dosimetry system comprises a sensor and a mounting apparatus that supports support the sensor and selectively positions the sensor at a plurality of points along the curvilinear path, wherein the mounting apparatus can selectively position the sensor to point toward a vertex of the scanned ion beam.
Abstract:
An ion source (50) for an ion implanter is provided, comprising a remotely located vaporizer (51) and an ionizer (53) connected to the vaporizer by a feed tube (62). The vaporizer comprises a sublimator (52) for receiving a solid source material such as decaborane and sublimating (vaporizing) the decaborane. A heating mechanism is provided for heating the sublimator, and the feed tube connecting the sublimator to the ionizer, to maintain a suitable temperature for the vaporized decaborane. The ionizer (53) comprises a body (96) having an inlet (119) for receiving the vaporized decaborane; an ionization chamber (108) in which the vaporized decaborane may be ionized by an energy-emitting element (110) to create a plasma; and an exit aperture (126) for extracting an ion beam comprised of the plasma. A cooling mechanism (100, 104) is provided for lowering the temperature of walls (128) of the ionization chamber (108) (e.g., to below 350° C.) during ionization of the vaporized decaborane to prevent dissociation of vaporized decaborane molecules into atomic boron ions. In addition, the energy-emitting element is operated at a sufficiently low power level to minimize plasma density within the ionization chamber (108) to prevent additional dissociation of the vaporized decaborane molecules by the plasma itself.
Abstract:
An ion beam implanter includes an ion beam source for generating an ion beam moving along a beam line and an implantation chamber wherein a workpiece is positioned to intersect the ion beam for ion implantation of a surface of the workpiece by the ion beam. The ion beam implanter further includes a workpiece support structure coupled to the implantation chamber and supporting the workpiece. The workpiece support structure includes a first rotation member rotatably coupled to the implantation chamber and overlaying an opening in the implantation chamber. The workpiece support structure further includes a second rotation member rotatably coupled to the first rotation member and having a rotating shaft that protrudes through the first member and an axis of rotation offset from an axis of rotation of the first rotation member. The workpiece support structure also includes a third member fixedly attached to the second rotation member that extends into the implantation chamber, the third member including a rotatable drive supporting the workpiece having an axis of rotation offset from the axis of rotation of the first rotation member. The first rotation member, the second rotation member and the rotatable drive of the third rotation member rotate to move the workpiece along a path of travel for implantation of the implantation surface wherein a distance that the ion beam moves through the implantation chamber before striking the implantation surface of the workpiece is constant.
Abstract:
An end effector for installation on a robotic arm for transporting a plurality of semiconductor wafers from one location to another features a ceramic end effector body portion that includes a plurality of wafer engaging fingers that each feature wafer support pads. The wafer support pads are adapted to support a semiconductor wafer surface, and at least one of the support pads has a vacuum orifice. The pads are replaceable and/or removable in case of damage or contamination. The support pads are attached to the body in such a way as to allow differential thermal expansion so as to prevent introduction of stress into the components. Typically, a wire spring is employed to secure the pad to the end effector. The body portion features an interior vacuum passageway having a first end that is adapted to connect to a vacuum source and a second end that terminates at the vacuum orifices such that a reduced gas pressure at the first end causes a vacuum to be exerted at the vacuum orifices. The interior passageway is formed from a groove in the end effector body portion and an end effector backplate that is sealingly connected to the end effector body portion to completely cover the groove from the first end to the second end. The ceramic body portion can be made of alumina or silicon carbide.
Abstract:
A magnetic deflector for an ion beam is disclosed and comprises first and second coils. The coils are positioned above and below the beam, respectively, and extend along a width of the beam. Current passes through the coils to generate a magnetic field therebetween that is generally perpendicular to a direction of travel of the beam along substantially the entire width thereof. In another aspect of the invention, a method of deflecting a beam prior to implantation into a workpiece is disclosed. The method includes determining one or more properties associated with the beam and selectively activating one of a magnetic deflection module and an electrostatic deflection module based on the determination.
Abstract:
A method for thermally processing a substrate provides a target substrate temperature and generates a move profile of the substrate within a thermal processing system. An amount of heat is provided to the substrate, and one or more temperatures associated with one or more respective locations on the substrate are measured. A predicted temperature profile is further generated, wherein a predicted temperature of the substrate is based on the amount of heat provided and the one or more measured temperatures. The amount of heat provided to the substrate is further regulated, based on the predicted temperature profile, wherein the substrate is thermally processed generally according to the intended substrate temperature profile. The amount of heat provided to the substrate can be further regulated by controlling a position of the substrate within the thermal processing system.
Abstract:
A method for drying and removing contaminants from a low-k dielectric film of an integrated circuit wafer, the method comprising exposing the low k dielectric layer to photons; and simultaneously with, prior to, or subsequent to the photon exposure, exposing the substrate to a process effective to remove the contaminants without causing degradation of the low k dielectric layer, wherein the process is selected from the group consisting of a heat process, a vacuum process, an oxygen free plasma process, and combinations thereof.
Abstract:
A profiling apparatus has a hollow cylinder having a circumferential slit having a circumferential slit width disposed about cylinder axis. Two or more beam current detectors are disposed within the cylinder to determine a respective beam current of an ion beam received at respective detector surfaces. An aperture plate is upstream of the cylinder and has an aperture slit running parallel to the cylinder having a slit width. A rotary input apparatus controls a rotational position of the cylinder. A linear translation apparatus controls a linear position of the cylinder and aperture plate. A controller determines a uniformity and angular profile of the ion beam in a plurality of dimensions based, at least in part, on the rotational position of the cylinder, the linear position of the cylinder and aperture plate, and the respective beam current of the ion beam received.
Abstract:
In some embodiments, the present disclosure relates to workpiece handling system. The workpiece handling system includes a vacuum workpiece handler having a surface configured to receive a semiconductor workpiece. The surface has edges that form a plurality of vacuum suction holes along the surface. A plurality of vacuum conduits are respectively coupled to the plurality of vacuum suction holes, and a shared vacuum plenum is coupled to the plurality of vacuum conduits. The plurality of vacuum conduits are arranged between the shared vacuum plenum and the plurality of vacuum suction holes. A restrictor is configured to independently vary communication of the plurality of vacuum conduits between the shared vacuum plenum and the plurality of vacuum suction holes. The restrictor includes a plurality of self-regulated passive restricting units.