Abstract:
A method of depositing high quality thin film at a high rate of deposition through the formation of a high flux of activated precursor species of a precursor deposition gas by employing a substantial pressure differential between the pressure adjacent the aperture in a conduit from which said precursor deposition gas is introduced into the interior of a vacuumized enclosure and the background pressure which exits in said enclosure. As the precursor deposition gas is introduced into said enclosure, a high density plume of said activated precursor species are formed therefrom due to an electromagnetic field established in an activation region adjacent said aperture. The pressure differential is sufficient to cause those activated precursor species to be deposited upon a remotely positioned substrate. In order to obtain a sufficient pressure differential, it is preferred that the flow of the precursor deposition gas reaches transonic velocity. And in order to obtain a high quality thin film, it is preferred that the plume of activated precursor species is spaced from the substrate; without structural or electrical confinement, a distance from the activation region greater than the mean free path of undesired activated precursor species and within the mean free path of desired species.
Abstract:
There are disclosed a method and apparatus for depositing a layer of material onto the outer surfaces of a plurality of cylindrical members. The cylindrical members are arranged to form a substantially closed loop with the longitudinal axes thereof disposed substantially parallel and the outer surfaces of adjacent members being closely spaced apart to form an inner chamber which is substantially closed. Adjacent cylindrical members form narrow passages which communicate with the inner chamber. At least one reaction gas is introduced into the inner chamber through at least one of the narrow passages and a plasma is formed from the at least one reaction gas within the inner chamber to deposit the layer of material onto the outer surfaces of the cylindrical members. The plasma can be formed by using either microwave energy or radio frequency energy. More particularly disclosed is a method and apparatus for making electrophotographic drums.
Abstract:
Apparatus for and a method of confining the ionized plasma developed during the glow discharge deposition of thin film semiconductor alloy material to preselected portions of the plasma region so as to prevent etching and deposit only uniform, nonhomogeneous semiconductor alloy material.
Abstract:
An improved cathode assembly specifically designed to provide for the uniform, localized profiling of dopant or other alterant elements into the host matrix of a semiconductor alloy material which is continuously and uniformly deposited onto a moving substrate by a glow discharge deposition process.
Abstract:
An apparatus for manufacturing photovoltaic devices of the type including a plurality of layers of semiconductor materials deposited onto a substrate includes a plurality of deposition chambers, each chamber arranged to deposit a respective one of the layers of semiconductor materials onto the substrate as the substrate is advanced therethrough. At least one of the deposition chambers is coupled to a source of microwave energy to form a microwave energy excited glow discharge plasma within the at least one deposition chamber for depositing at least one of the layers of semiconductor material onto the substrate from the microwave energy excited glow discharge plasma within the at least one deposition chamber.Also disclosed is an assembly for depositing a material onto a substrate from a microwave energy excited plasma. The assembly includes a deposition chamber, a source of microwave energy, and an antenna extending into the chamber and coupled to the microwave energy source. The antenna includes an outer sheath formed from a conductive material, an inner conductor extending within and electrically insulated from the outer sheath, and a slot within the outer sheath. The assembly also includes a new and improved feed-through for the antenna permitting the antenna to extend into the chamber while establishing a vacuum seal between the chamber and the antenna.
Abstract:
A method of and apparatus for accurately sensing and reproducibly controlling the intensity of electromagnetic energy in the decomposition region of a deposition chamber. The apparatus includes a detector adapted to (1) monitor the level of radiation emitted from the decomposition region and (2) provide an output signal indicative of said level. The invention further includes circuitry for (1) comparing the signal from the detector with a reference signal indicative of a preselected level of energy, and (2) generating a correction signal indicative of the actual level of energy in the decomposition region relative to the preselected level of energy. According to the method of this invention, the correction signal may be utilized to regulate the source of electromagnetic energy so that the preselected level of electromagnetic energy within the decomposition region is kept constant despite fluctuations in other operating parameters.