Abstract:
A method for producing a plasma silicon nitride series film with a small heat load having a low hydrogen concentration is provided. The method is for producing a silicon nitride series film on a material to be treated using a plasma CVD apparatus having a reaction chamber evacuated to vacuum. The method comprises the steps of introducing a monosilane gas (SiH 4 ) and a nitrogen gas (N 2 ) as raw material gases into the reaction chamber at prescribed flow rates, and heating the material to be treated to a prescribed temperature. At this time, it is characterized in that the flow rate of the nitrogen gas is at least 100 times the flow rate of the monosilane gas.
Abstract:
A plasma CVD apparatus conducting self-cleaning comprises a reaction chamber, a susceptor, a showerhead, a temperature controlling mechanism for directly controlling the temperature of the showerhead at a temperature of 200°C to 400°C, a remote plasma discharge device provided outside the reaction chamber, and a radio-frequency power source electrically connected to either of the susceptor or the showerhead.
Abstract:
A plasma CVD apparatus conducting self-cleaning comprises a reaction chamber, a susceptor, a showerhead, a temperature controlling mechanism for directly controlling the temperature of the showerhead at a temperature of 200°C to 400°C, a remote plasma discharge device provided outside the reaction chamber, and a radio-frequency power source electrically connected to either of the susceptor or the showerhead.
Abstract:
A plasma CVD device (1, 30, 110) includes a reaction chamber (2, 112), a remote plasma discharge chamber (13) that is provided remotely from the reaction chamber (2, 112), and piping (14) that links the reaction chamber (2, 112) and the remote plasma discharge chamber (13). The remote plasma discharge chamber (13) activates cleaning gas by plasma discharge energy, and the activated cleaning gas is introduced into the inside of the reaction chamber (2, 112) through the piping (14) and changes solid substances that adhere to the inside of the reaction chamber (2, 112) in consequence of film formation, to gaseous substances, thereby cleaning the inside of the reaction chamber. The device is characterized by at least one of the following: (a) the remote plasma discharge chamber (13) generates active species using radio frequency oscillating output energy of a preselected frequency; (b) the piping (14) is made of materials that are not corroded by the active species; or (c) the piping (14) is provided with a through-flow type valve (15).
Abstract:
A ceramic cover plate is placed on the surface of a heater typically consisting of a ceramic heater used in a CVD device so as to cover the entire heating surface of the heater, and a silicon wafer 2 is placed on a recessed supporting surface 2a defined by the surface of the cover plate 2. The surface of the ceramic heater is therefore protected by the cover made of a ceramic plate, and the surface of the ceramic heater is prevented from being directly exposed to the gas such as the cleaning gas. Because the corrosion caused by the cleaning gas is limited to the cover, the ceramic heater can be renewed simply by replacing the cover. This substantially reduces the cost for the maintenance work.
Abstract:
In a plasma CVD apparatus including a reaction chamber and a susceptor (3) to form a thin film on a semiconductor substrate, a pretreatment step is conducted to form a surface layer (20) on the surface of the susceptor so that the surface layer can prevent the semiconductor (11) substrate from electrostatically adhering to the surface of the susceptor. The pretreatment step includes steps of introducing into the reaction chamber a gas containing, e.g., the same gas as the gas for use in a film-forming treatment, and forming a surface layer on the susceptor surface by a CVD process.
Abstract:
A thin-film forming apparatus includes: (a) a reaction chamber (2) for forming a thin film on a workpiece (9) placed on a susceptor (3) provided in the reaction chamber; and (b) a cleaning device (30) for cleaning unwanted deposits adhering to the inside of the reaction chamber at predetermined intervals. The cleaning device includes: (i) a cleaning gas controller (15,21) for introducing a cleaning gas into the reaction chamber and evacuating the reaction chamber after the cleaning treatment; (ii) a cleaning gas activator (16) for activating the cleaning gas in radical form; and (iii) a temperature and timing controller programmed to reduce the temperature of the susceptor at a predetermined rate for cleaning after completion of film formation and then to actuate the cleaning gas controller and the cleaning gas activator.
Abstract:
A method for producing a plasma silicon nitride series film with a small heat load having a low hydrogen concentration is provided. The method is for producing a silicon nitride series film on a material to be treated using a plasma CVD apparatus having a reaction chamber evacuated to vacuum. The method comprises the steps of introducing a monosilane gas (SiH 4 ) and a nitrogen gas (N 2 ) as raw material gases into the reaction chamber at prescribed flow rates, and heating the material to be treated to a prescribed temperature. At this time, it is characterized in that the flow rate of the nitrogen gas is at least 100 times the flow rate of the monosilane gas.