摘要:
A processing system is provided with insulating members capable of easily fitted in, removed from and positioned in gas discharge holes, respectively. An etching system (100) is provided with an upper electrode (128) provided with gas discharge holes (128a) of a shape corresponding to the external shape of insulating members (144). The insulating members (144) are formed of a poly(ether ether ketone) resin, a polyimide resin, a poly(ether imide) resin or the like. Each insulating member 144 is provided in its outer surface with a step (144a). The length of the insulating members (144) is shorter than that of the gas discharge holes (128a). Each insulating member (144) is provided with a longitudinal through hole (144d), and an end part of the through hole (144d) on the side of a processing chamber (102) is tapered so as to expand toward the processing chamber (102). The insulating members (144) are pressed in the gas discharge holes (128a) from the side of the outlet ends of the gas discharge holes (128a) so as to bring the steps (144a) into contact with shoulders (128b) formed in the sidewalls of the gas discharge holes (128a). A part of each insulating member (144) as fitted in the gas discharge hole (128a) project from a surface of the upper electrode (128) facing a susceptor (110).
摘要:
A process and an apparatus for recovering a noble gas, which can recover a noble gas exhausted from a noble gas employing system efficiently and also can supply the noble gas of a predetermined purity to the noble gas employing system and which can reduce consumption of the noble gas. In the process and apparatus for recovering a noble gas, when a noble gas contained in an exhaust gas exhausted from a noble gas employing system operated under reduced pressure is recovered, switching between introduction of the exhaust gas to a recovery system and exhaustion of the exhaust gas to an exhaust system is carried out under reduced pressure, and this switching operation is carried out depending on the content of impurity components contained in the exhaust gas or on the running state of the noble gas employing system.
摘要:
The present invention provides a sputtering power supply apparatus which realizes stable sputtering at a pressure lower than the discharge start pressure, so that scattering of sputtering particles due to collision with sputtering inert gas can be reduced, thereby improving the step coverage and the denseness of the sputter film. According to the present invention, there is provided a sputtering power supply apparatus comprising a sputtering DC power source (A), a constant current circuit (B) connected to the DC power source, a sputtering source (21) connected to the constant current circuit (B), and a control unit (11) for controlling a current output from the constant current circuit (B) so as to be a constant current.
摘要:
A process and an apparatus for recovering a noble gas, which can recover a noble gas exhausted from a noble gas employing system efficiently and also can supply the noble gas of a predetermined purity to the noble gas employing system and which can reduce consumption of the noble gas. In the process and apparatus for recovering a noble gas, when a noble gas contained in an exhaust gas exhausted from a noble gas employing system operated under reduced pressure is recovered, switching between introduction of the exhaust gas to a recovery system and exhaustion of the exhaust gas to an exhaust system is carried out under reduced pressure, and this switching operation is carried out depending on the content of impurity components contained in the exhaust gas or on the running state of the noble gas employing system.
摘要:
A vapor deposition apparatus for supplying raw-material gas into a reactor to form a thin film on a wafer substrate disposed in the reactor by vapor deposition, including at least a rotator for mounting the wafer substrate thereon, a treatment gas introducing port, a straightening vane having plural holes, and a wafer substrate feed-in/out port, wherein the lowermost portion of the wafer feed-in/out port is located at a predetermined height from the upper surface of the rotator, and the difference in height between the lowermost portion of the wafer feed-in/out port and the upper surface of the rotator is set to be larger than the thickness of a transition layer of the upper portion of the rotator. In a vapor deposition method, a wafer substrate is mounted on the rotator to form a thin film having little defect and uniform film thickness on the wafer substrate by using the vapor deposition apparatus.
摘要:
Molecular beam epitaxy (202) with growing layer thickness control (206) by feedback of mass spectrometer (204) signals based on a process model. Examples include III-V compound structures with multiple AlAs, InGaAs, and InAs layers as used in resonant tunneling diodes.
摘要:
This invention discloses a heterojunction bipolar transistor (HBT) which includes a relatively thin intrinsic collector region and a relatively thick extrinsic collector region such that collector-base capacitance is reduced and electron transit time is maintained. The fabrication of the HBT includes loading a semi-insulating substrate into an molecular beam epitaxy machine, and growing a sub-collector contact layer, a bottom collector layer and a top collector layer on the substrate. Next, the substrate is removed from the molecular beam epitaxy machine and the top collector layer is etched by a photolithographic process to produce separate intrinsic and extrinsic collector regions. Then, the substrate is again loaded into the molecular beam epitaxy machine so that the base and emitter layers can be grown. And finally, the emitter layer is etched to form an emitter mesa only over the intrinsic semiconductor region.
摘要:
Diffusion of p-type Be dopant out of the base (40) of an npn heterojunction bipolar transistor (HBT) during the transistor fabrication is prevented by growing the base (40) at a low temperature, generally within the range of about 280°-420°C for a AlInAs/GaInAs device. The DC current gain is maximized by growing the base (40) at the highest permissible temperature before outdiffusion occurs, which is substantially above the Be precipitation temperature.
摘要:
A process for fabricating thin film transistors (TFTs) which comprises a two-step laser annealing process in which crystallization of the channel portion of a TFT is effected by irradiating the channel portion with an irradiation beam, for example from an excimer laser, and modification of the electric properties of the source and the drain regions of the TFT is effected by irradiating the source and the drain regions with an irradiation beam in a step independent of the step of crystallizing the channel portion. The process is carried out at low temperature and enables TFTs to be produced effectively and economically without risk of contamination by substrate impurities and with good expectation of a long operational lifetime.
摘要:
A method of fabricating a semiconductor device comprises forming a first mixed crystal semiconductor layer (106) comprising AlAs and InAs; applying a solution containing a material that is easily combined with fluorine to the surface of the first mixed crystal semiconductor layer (106) exposed to the atmosphere so that the material contained in the solution combines with fluorine that sticks to the surface of the first mixed crystal semiconductor layer (106); and annealing the first mixed crystal semiconductor layer (106) in a vacuum at a high temperature. In this method, since the fluorine on the surface of the first mixed crystal semiconductor layer (106) exposed to the atmosphere is combined with the material included in the solution and removed together with the material, a first mixed crystal semiconductor layer (106) having no fluorine is produced. Therefore, unwanted infiltration of fluorine into the first mixed crystal semiconductor layer (106) is avoided, resulting in a highly reliable semiconductor device with desired characteristics.