TWI674627B

An object of the present invention is to provide a plasma processing method capable of removing complex depositions of metal and non-metal deposited in a processing chamber by etching processing of a wafer to reduce generation of particle due to the depositions, in a plasma processing method for plasma-etching the wafer such as a semiconductor substrate.According to the present invention, there is provided a plasma processing method for plasma-etching a sample in a processing chamber and plasma-cleaning the inside of the processing chamber, the method comprising: an etching step for plasma-etching a predetermined number of the samples; a metal removing step of removing a deposited film containing a metal element by using a plasma after the etching step; and a non-metal removing step of removing the deposited film containing the non-metal element by using a plasma different from the plasma in the metal removing step, in which the metal removing step and the non-metal removing step are repeated twice or more.