Patent ID: 8651049
Filing Date: 2014-02-18
Classification: H01J,H01L

Abstract:
1. A plasma processing apparatus comprising: an evacuable processing chamber having a processing space, a gas exhaust port provided at a bottom portion of the processing chamber, and an inner wall; a lower electrode for mounting thereon a substrate in the processing chamber; an upper electrode facing and parallel to the lower electrode in the processing chamber; a processing gas supplying unit for supplying a processing gas to the processing space, which is between the upper electrode and the lower electrode; a radio frequency (RF) power supply unit for applying an RF power to the lower electrode to generate a plasma of the processing gas by RF discharge; an electrically conductive RF ground member which covers a peripheral portion of the lower electrode to receive RF power emitted outwardly in radial directions from the peripheral portion of the lower electrode and to send the received RF power to a ground line; an annular gas exhaust path that connects the processing space to the gas exhaust port and that is provided between the RF ground member and an inner wall of the processing chamber; and a plurality of conductive fin members which are electrically grounded, which extend vertically, which are configured to promote extinction of a plasma diffused from the processing space, and which are provided at an upper region of the gas exhaust path.