Patent ID: 9653316
Date: 2017-05-16
CPC Classifications: H01J,H01L

Claim:
1. A plasma processing method using a plasma processing apparatus including a lower electrode serving as a mounting unit of an object to be processed, and an upper electrode disposed to face the lower electrode, the plasma processing method comprising: supplying a processing gas into a processing container in which the object to be processed is disposed; supplying a plasma generating power of a frequency ranging from about 100 MHz to about 150 MHz to the lower electrode as a power for generating plasma of the processing gas supplied into the processing container, and supplying a biasing power which is a power having a frequency lower than the frequency of the plasma generating power to the lower electrode; and etching the object to be processed by the plasma of the processing gas while pulse-modulating the biasing power so that a duty ratio ranges from about 10% to about 70% and the frequency ranges from about 5 kHz to about 20 kHz in a state where the plasma generating power is maintained to be turned on in a substantially constant state while the biasing power is modulated with the duty ratio which ranges from about 10% to about 70% in order o uniformize a plasma density at a central portion and at a peripheral portion of the object to be processed.