| 摘要 |
When using pulsed highly ionized magnetic sputtering for reactive deposition the pressure of the reactive gas in the area of the electrodes is drastically reduced by designing the anode electrode as a tube (3) having an opening facing the surface of the cathode (7) and an opposite opening facing the process chamber (11). The work piece (13) is placed in the process chamber which is connected (31) to a vacuum system and to which the reactive gas is supplied (29). The sputtering non-reactive gas is supplied (23) in the region of the cathode. Inside the anode tube the ions are guided by a stationary magnetic field generated by at least one coil (27) wound around the anode, the generated magnetic field thus being substantially parallel to the axis of the anode tube. The anode tube can be separated from the process chamber by a restraining device such as a diaphragm (41) having a suitably sized aperture or a suitably adapted magnetic field arranged at the connection of the anode with the process chamber. By the reduction of the pressure of the reactive gas at the cathode and anode the formation of compound layers on the surfaces of the electrodes between which the magnetron discharges occur is avoided resulting in stable discharges and a very small risk of arcing. Also, the neutral component in the plasma flow can be prevented from reaching the process chamber. By suitably operating the device e.g. sputtering of coatings in deep via holes for high density interconnections on semiconductor chips can be efficiently made. |
