Patent ID: 6897559

Claim:
An apparatus for forming a silicon-based thin film on a substrate using a plurality of deposited film forming vessels by a high-frequency plasma process, comprising a substrate and a high frequency applying electrode disposed in opposition to each other in each of the deposited film forming vessels, wherein the plurality of deposited film forming vessels including a first deposited film forming vessel having a first high-frequency applying electrode disposed so as to be distant by 10 mm±5 mm from the substrate and a first means for applying high-frequency waves of a first frequency selected from the range between 30 MHz and 500 MHz connected to the first high-frequency applying electrode, and a second deposited film forming vessel having a second high-frequency applying electrode disposed so as to be distant by 20 mm±5 mm from the substrate and a second means for applying high-frequency waves of a second frequency less than the first frequency selected from the range between 10 MHz and 30 MHz connected to the second high-frequency applying electrode.