Abstract:
A method and apparatus are provided that have the capability of rapidly scanning a large sample of arbitrary characteristics under force control feedback so has to obtain a high resolution image. The method includes generating relative scanning movement between a probe (215) of the SPM and a sample (112) to scan the probe through a scan range of at least 4 microns at a rate of at least 30 lines/sec and controlling probe-sample interaction with a force control slew rate of at least 1 mm/sec. A preferred SPM capable of achieving these results has a force controller having a force control bandwidth of at least closed loop bandwidth of at least 10 kHz.
Abstract:
The present invention relates to a sputter deposition system 10 and to methods of use thereof for processing substrates 12 using planetary sputter deposition methods. The sputter deposition system 10 includes a deposition chamber 14 having an azimuthal axis 16. A rotatable member 30 and 32 is situated in the chamber 14 and includes a plurality of magnetrons 34 provided thereon. Each magnetron 34 includes a corresponding one of a plurality of sputtering targets 36. The rotatable member 30, 32 is configured to position each of the magnetrons 34 to direct sputtered material from the corresponding one of the sputtering targets 36 to a deposition zone 50 defined in the deposition chamber 14. A transport mechanism 66 is situated in the deposition chamber 14 and includes an arm 68 rotatable about the azimuthal axis 16. A substrate holder 72 is attached to the arm 68 of the transport mechanism 66 and supports the substrate 12 as the arm 68 rotates the substrate holder 72 to intersect the deposition zone 50 for depositing sputtered material on the substrate 12.
Abstract:
A design process for varying hole locations or sizes or both in an ion beam grid includes identifying a control grid to be modified; obtaining a change factor for the grid pattern; and using the change factor to generate a new grid pattern. The change factor is one or both of a hole location change factor or a hole diameter change factor. Also included is an ion beam grid having the characteristic of hole locations or sizes or both defined by a change factor modification of control grid hole locations or sizes or both.
Abstract:
A system and method is disclosed for increasing the emissivity of solid materials, wherein first the surface of the material is mechanically worked to create micro-level defects, and then etched to create a deep micro-rough surface morphology. In this manner, higher efficiencies and lower energy consumption can be obtained when these modified materials are used for heating elements. Heating elements made in accordance with this process thus operate at lower temperatures with longer lifetimes, when the improved heating elements are used with various heating devices.
Abstract:
A cantilever probe-based instrument (10, 110) is controlled to counteract the lateral loads imposed on the probe as a result of probe sample interaction. The probe preferably includes an active cantilever, such as a so-called bimorph cantilever. Force counteraction is preferably achieved by monitoring a lateral force-dependent property of probe operation such as cantilever free end deflection angle and applying a voltage to at least one of the cantilever and one or more separate actuators under feedback to maintain that property constant as the probe-sample spacing decreases. The probe could further uses at least one of contact flexural and torsional resonances characteristics to determine contact and release points. With the knowledge of the tip profile, quantitative mechanical data for probe sample interaction can be obtained.
Abstract:
The preferred embodiments are directed to a method and apparatus of operating a scanning probe microscope (SPM) including oscillating a probe of the SPM at a torsional resonance of the probe, and generally simultaneously measuring an electrical property, e.g., a current, capacitance, impedance, etc., between a probe of the SPM and a sample at a separation controlled by the torsional resonance mode. Preferably, the measuring step is performed while using torsional resonance feedback to maintain a set-point of SPM operation.
Abstract:
An integrated phase separator for use in an ultra high vacuum system, for example, a molecular beam epitaxy system, is described. The vacuum chamber has a cryogenic panel disposed therein. The cryogenic panel includes a cryogenic shroud region and a phase separator region. Liquid nitrogen is introduced into the cryogenic panel via an inlet line. As the liquid nitrogen warms and vaporizes, nitrogen vapor rises within the shroud. The phase separator region within the cryogenic panel provides a near atmospheric pressure vapor barrier over the liquid nitrogen so the t the nitrogen vapor may escape smoothly through the outlet of the panel, without forming gas bursts. Also the phase separator region is vacuum jacketed to prevent cryogenic shroud surface temperature changes due to variations in liquid nitrogen levels, thereby increasing the cryogenic shroud’s pumping stability. In one embodiment, used in molecular beam epitaxy (MBE), the cryopanel is divided into first and second cooling chambers. The first cooling chamber contains liquid nitrogen and surrounds the substrates to be coated, while the second cooling chamber contains a different fluid such as water, and surrounds the effusion cells so as to dissipate heat generated during the operation of effusion cells.
Abstract:
A loading station receives a substrate into a load-lock volume pressure isolated from a loading station chamber which is open to a processing chamber. The volume is evacuated and the substrate lowered into the loading chamber. A transport arm moves the substrate frOm the loading station to a substrate carrier of a cooling fixture within the processing chamber. The carrier is connected to a clamp which together move vertically downward to lower the wafer onto a substrate seat of the fixture. During substrate processing the fixture is tiltable and rotatable and provides substrate cooling by solid-to-solid conduction, forced convection and free convection. Solid-to-solid conduction is provided by the clamp. The substrate is pressed to the fixture by the cooling clamp having a circulating cooling fluid. Forced convection is provided by a gas flowing into the microspic areas between the substrate and the fixture at a pressure high enough to cause bowing or lifting of the substrate and thus to create a gas region between the substrate and the fixture. An O-ring provides a seal under the pressure of the clamps near the periphery of the substrate to substantially seal the gas from entering the processing chamber. The gas flows into and through the gas region absorbing heat energy from the back surface of the substrate and flowing out of the region. Free convection is provided by heat transfer between the substrate and the substrate seat. The pressure in the gas region is high enough that the mean free path of the gas molecules is less than the distance between the substrate and the fixture. As a result gas molecules absorb energy from the substrate and intermix and transfer energy with other molecules. Some molecules collide with the substrate seat and transfer heat energy to the seat. After substrate treatment the gas is evacuated from behind the substrate prior to release of the clamps.
Abstract:
A loading station receives a substrate into a load-lock volume pressure isolated from a loading station chamber which is open to a processing chamber. The volume is evacuated and the substrate lowered into the loading chamber. A transport arm moves the substrate frOm the loading station to a substrate carrier of a cooling fixture within the processing chamber. The carrier is connected to a clamp which together move vertically downward to lower the wafer onto a substrate seat of the fixture. During substrate processing the fixture is tiltable and rotatable and provides substrate cooling by solid-to-solid conduction, forced convection and free convection. Solid-to-solid conduction is provided by the clamp. The substrate is pressed to the fixture by the cooling clamp having a circulating cooling fluid. Forced convection is provided by a gas flowing into the microspic areas between the substrate and the fixture at a pressure high enough to cause bowing or lifting of the substrate and thus to create a gas region between the substrate and the fixture. An O-ring provides a seal under the pressure of the clamps near the periphery of the substrate to substantially seal the gas from entering the processing chamber. The gas flows into and through the gas region absorbing heat energy from the back surface of the substrate and flowing out of the region. Free convection is provided by heat transfer between the substrate and the substrate seat. The pressure in the gas region is high enough that the mean free path of the gas molecules is less than the distance between the substrate and the fixture. As a result gas molecules absorb energy from the substrate and intermix and transfer energy with other molecules. Some molecules collide with the substrate seat and transfer heat energy to the seat. After substrate treatment the gas is evacuated from behind the substrate prior to release of the clamps.
Abstract:
Systeme de rereperage permettant de determiner l'emplacement et de positionner la surface cible d'un substrat de tranche (275) par rapport a une pluralite de rayons de particules chargees utilisees pour ecrire directement le schema d'un circuit integre simultanement a une pluralite d'emplacements sur le substrat. Le rereperage est execute en explorant avec deux ou plusieurs rayons de particules chargees (100, 150) un nombre correspondant de reperes fiduciels de re-reperage (200, 250) sur le substrat (275). Ces reperes (200, 250) peuvent se composer d'un materiau possedant un nombre atomique eleve ou des caracteristiques topographiques definies au prealable. Des electrons disperses par ces reperes (200, 250) sont detectes et convertis en signaux electriques. La relation temporelle entre les rayons d'exploration (100, 150) et les signaux electriques resultants peut etre utilisee pour determiner l'emplacement du substrat.