Patent ID: 8840753
Filing Date: 2014-09-23
Classification: H01J,H01L

Abstract:
1. A plasma etching unit for selectively plasma-etching an organic-material film of a substrate having the organic-material film and an inorganic-material thereon while using the inorganic-material film to function as a mask, said unit comprising: a chamber configured to contain the substrate to be processed, first and second electrodes oppositely arranged in the chamber, the second electrode being configured to support the substrate to be processed, a process-gas supplying system configured to supply a process gas into the chamber, a gas-discharging system configured to discharge a gas in the chamber, and a first high-frequency electric power source configured to supply a high-frequency electric power of 50 MHz to 150 MHz for forming a plasma to the second electrode, a second high-frequency electric power source configured to apply a second high-frequency electric power of 500 kHz to 27 MHz to the second electrode, the second high-frequency electric power being overlapped with the first high-frequency electric power, and a magnetic-field forming unit configured to form a magnetic field around a plasma region between the first and second electrodes, the magnetic-field forming unit consisting of a magnetic annular unit having a plurality of synchronously and oppositely rotatable segment magnets concentrically arranged around the chamber such that magnetic-pole directions of adjacent segment magnets are opposite, and each segment magnet is vertically bisected into two associated magnets to define an upper set of annularly arranged magnets and a lower set of annularly arranged magnets, and each associated upper magnet and lower magnet are vertically moveable with respect to each other in order to set a vertical gap therebetween.