Abstract:
Ion implantation systems and beamline assemblies therefor are provided, in which multi-cusped magnetic fields are provided in a beamguide and the beamguide is energized to provide microwave electric fields in a traveling wave along the beamguide passageway. The magnetic and electric fields interact to provide an electron-cyclotron resonance condition for beam containment in the beamguide passageway.
Abstract:
An electrostatic clamp for securing a semiconductor wafer during processing. The electrostatic clamp comprises a base member, a resistive layer, a dielectric layer including a gas pressure distribution micro-groove network, a gas gap positioned between a backside of a semiconductor wafer and the dielectric layer, and a pair of high voltage electrodes positioned between the resistive layer and the dielectric layer. The electrostatic clamp can further comprise at least one ground electrode positioned between the resistive layer and the dielectric layer that provides shielding for the gas pressure distribution micro-groove network. The electrostatic clamp is characterized by a heat transfer coefficient of greater than or about 200 mW/Kcm 2 , a response time of less than or about 1 second, and gas leakage of less than or about 0.5 sccm. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. .
Abstract:
Systems and methods are provided for focusing a scanned ion beam in an ion implanter. A beam focusing system is provided, comprising first and second magnets providing corresponding magnetic fields that cooperatively provide a magnetic focusing field having a time-varying focusing field center generally corresponding to a time-varying beam position of a scanned ion beam along a scan direction. Methods are presented, comprising providing a focusing field having a focusing field center in the scan plane, and dynamically adjusting the focusing field such that the focusing field center is generally coincident with a time-varying beam position of the scanned ion beam along the scan direction.
Abstract:
Ion implantation systems are provided, comprising a dispersion system (140) located between an ion source (120) and a mass analyzer (26), that operates to selectively pass an extracted ion beam from the ion source toward the mass analyzer or to direct a dispersed ion beam toward the mass analyzer, where the dispersed ion beam has fewer ions of an undesired mass range than the extracted ion beam.
Abstract:
A plasma generator for space charge neutralization of an ion beam is disclosed and resides within an ion implantation system operable to generate an ion beam and direct the ion beam along a beamline path. The plasma generator comprises an electric field generation system operable to generate an electric field in a portion of the beamline path, and a magnetic field generation system operable to generate a magnetic field in the portion of the beamline path, wherein the magnetic field is perpendicular to the electric field. The plasma generator further comprises a gas source operable to introduce a gas in a region occupied by the electric field and the magnetic field. Electrons in the region move in the region due to the electric field and the magnetic field, respectively, and at least some of the electrons collide with the gas in the region to ionize a portion of the gas, thereby generating a plasma in the region.
Abstract:
Ion implantation systems and beamlines therefor are disclosed, in which a ribbon beam of a relatively large aspect ratio is mass analyzed and collimated to provide a mass analyzed ribbon beam for use in implanting one or more workpieces. The beamline system (12) comprises two similar magnets (22, 24), where the first magnet (22) mass analyzes the ribbon beam to provide an intermediate mass analyzed ion beam, and the second magnet (24) collimates the intermediate beam to provide a uniform mass analyzed ribbon beam to an end station.(18). The symmetrical system provides equidistant beam trajectories (41, 43) for ions across the elongated beam width so as to mitigate non-linearities in the beam transport through the system, such that the resultant mass analyzed beam is highly uniform.
Abstract:
Methods are provided for calibrating an ion beam scanner in an ion implantation system, comprising measuring a plurality of initial current density values at a plurality of locations along a scan direction, where the values individually correspond to one of a plurality of initial voltage scan intervals and one of a corresponding plurality of initial scan time values, creating a system of linear equations based on the measured initial current density values and the initial voltage scan intervals, and determining a set of scan time values that correspond to a solution to the system of linear equations that reduces current density profile deviations. A calibration system is provided for calibrating an ion beam scanner in an ion implantation system, comprising a dosimetry system and a control system.
Abstract:
The present invention is directed to a semiconductor thermal processing apparatus and a method for thermally cooling a semiconductor substrate. According to one aspect of the present invention, a gas-cooled clamp and associated method is disclosed which provides cooling of a substrate by thermal conduction generally in the free molecular regime. The gas-cooled clamp comprises a clamping plate having a plurality of protrusions that define gaps therebetween, wherein a distance or depth of the gaps are associated with a mean free path of the cooling gas therein. The gas-cooled clamp further comprises a pressure control system operable to control a backside pressure of the cooling gas within the plurality of gaps to thus control a heat transfer coefficient of the cooling gas, wherein the heat transfer coefficient of the cooling gas is primarily a function of the pressure and substantially independent of the gap distance.
Abstract:
An improved electrode subassembly for an ion implanter is provided. The subassembly comprises (i) a first generally planar electrode residing in a first plane and having a first aperture; (ii) a second generally planar electrode residing in a second plane generally parallel to the first plane and having a second aperture aligned with the first aperture; and (iii) a pair of connecting rods connecting the first generally planar electrode to the second generally planar electrode. The connecting rods permit generally parallel and slidable movement of the second generally planar electrode with respect to the first generally planar electrode. The connecting rods are positioned in a non-parallel relationship to each other, so that the first and second electrodes when undergoing thermal expansion slide with respect to each other upon the non-parallel connecting rods, to increase or decrease a distance therebetween, while maintaining a parallel relationship.
Abstract:
An ion source is disclosed having an elongated slit for providing a ribbon ion beam for use in an ion implantation system. The source comprises a coaxial inductive coupling antenna for RF excitation of plasma within a cylindrical source housing, as well as circumferential magnets disposed within the housing for generating azimuthal multi-cusped magnetic fields for plasma confinement. Also disclosed is a liner for the housing interior providing thermal barrier between the plasma and the outer housing wall so as to mitigate or reduce condensation within the plasma confinement chamber.