Invention Grant
US08641916B2 Plasma etching apparatus, plasma etching method and storage medium 有权
等离子体蚀刻装置,等离子体蚀刻方法和存储介质

Plasma etching apparatus, plasma etching method and storage medium
Abstract:
A plasma etching method for forming a hole in an etching target film by a plasma processing apparatus is provided. The apparatus includes an RF power supply for applying RF power for plasma generation to at least one of upper and lower electrodes, and a DC power supply for applying minus DC voltage to the upper electrode. A first condition that plasma is generated by turning on the RF power supply and minus DC voltage is applied to the upper electrode and a second condition that the plasma is extinguished by turning off the RF power supply and minus DC voltage is applied to the upper electrode are alternately repeated. Etching is performed by positive ions in the plasma under the first condition and negative ions are supplied into the hole by the DC voltage to neutralize positive ions in the hole under the second condition.
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