摘要:
An electrostatic chuck (20) for holding a substrate in a process chamber (80), having a voltage supply terminal (65) for charging the chuck. The chuck includes an electrostatic member (25) comprising at least one electrode (30) covered by an electrically insulated holding surface (40) for holding a substrate thereon, and an electrical contact surface (48) for providing charge to the electrode. A unidirectionally conducting coupler (70) electrically couples the contact surface (48) of the electrostatic member to the voltage supply terminal (65) to conduct charge substantially only in a single direction from the terminal to the contact surface. Preferably, an electrical connector (50) having a junction surface (55) is bonded to the electrical contact surface (48), and a terminal surface (60) for electrically contacting the voltage supply terminal, electrically couples the unidirectionally conducting coupler (70) to the voltage supply terminal (65).
摘要:
Vacuum CVD chambers are disclosed which provide a more uniformly deposited thin film on a substrate (14). The chamber susceptor mount (210) for the substrate (14) is heated resistively with a single coil firmly contacting the metal of the susceptor on all sides, providing uniform temperatures across the susceptor mount (210) for a substrate (14). A purge gas line (222) is connected to openings in the susceptor outside of the periphery of the substrate (14) to prevent edge and backside contamination of the substrate (14). A vacuum feed line mounts the substrate to the susceptor (210) during processing. A refractory purge guide (226), or a plurality of placement pins, maintain a fixed gap passage for the purge gases to pass alongside the edge of the wafer (14) and into the processing area of the chamber. An exhaust pumping plate improves the uniformity of exhaustion of spent gases from the chamber.
摘要:
Apparatus for CVD processing wherein a wafer (28) mounted in a chamber (24) of a reactor (20) on a vertically movable susceptor (26) beneath a showerhead (30). The susceptor extends beyond the outer perimeter of the wafer such that, when the susceptor is raised into contact with a shield ring (40) which normally rests on a ring support (42) in the chamber, the shield ring engages outer portion of the susceptor beyond the perimeter of the wafer, lifting the shield ring off its support. The shield ring (40) shields the edge of the top surface of the susceptor during the deposition, whereby unwanted deposition on the susceptor is prevented while, at the same time, allowing for deposition over the entire upper surface of the wafer. To center the shield ring and the susceptor with respect to each other, the shield ring may include a plurality of centering protrusions (60), at least some of which engage the susceptor as it moves upwards to lift the shield ring off its supports in the chamber.
摘要:
In CVD processes susceptors can be made of a thermally conductive ceramic such as aluminum nitride which has superior durability with respect to fluorine plasma. Such aluminum nitride susceptors (39) can include an embedded heater element (43) and/or embedded ground or RF electrodes (41) which as a result of their embedment are protected from the deleterious effects of the processing chamber environment. The conductors (87; 89, 91; 93) leading to these elements are protected from exposure to the process chamber environment by passing through a cylindrical member (25) filled with inert gas supporting the wafer support plate (39) of said susceptor. Alternatively, the conductors leading to these elements can be run through passages in a hermetically sealed stem (120) supporting the susceptor wafer support plate (100). The stem passes through the wall of the processing chamber so that connections to the susceptor wafer support plate can be made outside the processing chamber. Such a stem supporting the suspector support plate can also provide passages (144, 146) for passing vacuum and purge gas to the back of the wafer support plate. Vacuum and purge gas can then be distributed through passages (150, 151) in the wafer support plate as appropriate to its top surface for a vacuum chuck and perimeter purge gas flow.
摘要:
An electrostatic chuck (32) is provided for firmly holding a semiconductor substrate (8) in position in a processing chamber (10). The electric connection (46) for the electrode (34) of the electrostatic chuck is provided through an aperture (44) in the pedestal (30) to protect the strap portion (40) of the chuck from erosion caused by the processing environment.
摘要:
In CVD processes susceptors can be made of a thermally conductive ceramic such as aluminum nitride which has superior durability with respect to fluorine plasma. Such aluminum nitride susceptors (39) can include an embedded heater element (43) and/or embedded ground or RF electrodes (41) which as a result of their embedment are protected from the deleterious effects of the processing chamber environment. The conductors (87; 89, 91; 93) leading to these elements are protected from exposure to the process chamber environment by passing through a cylindrical member (25) filled with inert gas supporting the wafer support plate (39) of said susceptor. Alternatively, the conductors leading to these elements can be run through passages in a hermetically sealed stem (120) supporting the susceptor wafer support plate (100). The stem passes through the wall of the processing chamber so that connections to the susceptor wafer support plate can be made outside the processing chamber. Such a stem supporting the suspector support plate can also provide passages (144, 146) for passing vacuum and purge gas to the back of the wafer support plate. Vacuum and purge gas can then be distributed through passages (150, 151) in the wafer support plate as appropriate to its top surface for a vacuum chuck and perimeter purge gas flow.
摘要:
A rotatable substrate supporting mechanism (20) for use in a chemical vapor deposition reaction chamber of the type used in producing semi-conductor devices is provided with a susceptor (30) forsupporting a single substrate (32), or wafer, for rotation about an axis normal to the center of the wafer. The mechanism is provided with a temperature sensing system (130) for producing signals indicative of sensed temperatures taken at the center of the susceptor and at various points about the periphery thereof. A gas purging system (176, 111 ,178) is provided for inhibiting the flow of reactant gas in unwanted areas of the reaction chamber and in the supporting system itself. Rotational driving of the mechanism is accomplished by a variable speed motor (194) under control of a circuit (212) which stops and starts the rotation at controlled speeds and stops the rotation at a homeposition for enhancing the handling of the wafers.