Patent ID: 7074720

Claim:
A plasma treating method in a plasma treating apparatus comprising a treatment chamber, a first electrode having a holding portion for holding a semiconductor wafer in the treatment chamber, a second electrode provided in a position opposed to the first electrode and including a gas supplying port for supplying a gas for plasma generation to the treatment chamber and an electrode member having a three-dimensional network structure made of frame portions constituted by a fine ceramic sintered substance, and a plurality of irregular paths defined by clearance of the frame portions, through which the gas for plasma generation passes, which is attached to a front surface thereof, a pressure control portion for reducing a pressure in the treatment chamber, a gas supplying portion for supplying a mixed gas containing fluorine and helium as the gas for plasma generation to the treatment chamber through the gas supplying port, and a high frequency generating portion for applying a high frequency voltage between the first electrode and the second electrode, the method comprising the steps of: applying a high frequency voltage between the first electrode and the second electrode while blowing off the gas for plasma generation from an irregular path constituted by a clearance of the three-dimensional network structure, thereby generating a plasma, and etching a semiconductor wafer held in the first electrode by the generated plasma.