PLASMA ETCHING METHOD FOR ETCHING AN OBJECT
First Claim
1. A plasma etching method for etching an object to be etched in a plasma etching apparatus using a mask patterned and formed on the object to be etched, the method comprising:
- etching the mask by attaching deposits on a side wall of an opening close to a surface of the patterned mask and forming a bowing on a side wall of the opening distant from the surface of the mask; and
etching the object to be etched using the mask.
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Accused Products
Abstract
The invention provides a plasma etching method capable of suppressing bowing of an opening of the object to be etched, and solving the lack of opening at a high aspect ratio portion in deep hole processing having a high aspect ratio. A plasma etching method for etching an object to be etched in a plasma etching apparatus using a mask patterned and formed on the object to be etched comprises sequentially performing a first step for etching the mask while attaching deposits on a side wall of an opening close to a surface of the mask pattern of the mask using fluorocarbon gas CxFy (x=1, 2, 3, 4, 5, 6, y=4, 5, 6, 8), and a second step for etching the object to be etched while removing the deposits attached to the side wall of the opening close to the surface of the mask pattern of the mask using fluorocarbon gas.
67 Citations
14 Claims
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1. A plasma etching method for etching an object to be etched in a plasma etching apparatus using a mask patterned and formed on the object to be etched, the method comprising:
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etching the mask by attaching deposits on a side wall of an opening close to a surface of the patterned mask and forming a bowing on a side wall of the opening distant from the surface of the mask; and etching the object to be etched using the mask. - View Dependent Claims (10, 13)
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2. A plasma etching method for etching an object to be etched in a plasma etching apparatus using a mask patterned and formed on the object to be etched, the method comprising:
sequentially performing a first step of etching the mask while attaching deposits on a side wall of an opening close to a surface of the mask pattern of the mask using fluorocarbon gas CxFy (x=1, 2, 3, 4, 5, 6, y=4, 5, 6,
8), and a second step of etching the object to be etched while removing the deposit attached to the side wall of the opening close to the surface of the mask pattern of the mask using fluorocarbon gas CxFy (x=1, 2, 3, 4, 5, 6, y=4, 5, 6,
8).- View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 11, 12, 14)
Specification