Patent ID: 6867146

Claim:
The plasma-processing method of comprising: providing a grounded electrode located within a process chamber; mounting a silicon-containing substrate on a mounting unit comprising an electrode located within the process chamber; generating plasma by feeding plasma-generating gas comprising fluorine-containing gas into the process chamber and causing a plasma discharge by applying a high frequency voltage across a volume of gas within said chamber between said mounting unit and the grounded electrode; and etching the silicon-containing substrate with the plasma while keeping the silicon-containing substrate at a temperature of at least 40° C. wherein the silicon-containing substrate is a silicon wafer having a first side having a protective tape affixed thereon and a second side opposite the first side, wherein said mounting the silicon-containing substrate comprises mounting the silicon wafer on the mounting unit with the protective tape located between the wafer and the mounting unit, and wherein said etching the silicon-containing substrate comprises etching the second side while the mounting unit is held at the temperature.