PLASMA ETCHING APPARATUS AND PLASMA CLEANING METHOD
First Claim
1. A plasma etching apparatus comprising:
- an evacuable processing chamber;
a first electrode for mounting a target object in the processing chamber;
an electrostatic chuck provided on a mounting surface of the first electrode to hold the target object by an electrostatic force, a dielectric material of a surface layer portion of the electrostatic chuck including a metal;
a second electrode disposed to face the first electrode in parallel in the processing chamber;
an etching gas supply unit for supplying an etching gas to a processing space between the first and the second electrode to perform a dry etching process on the target object;
a cleaning gas supply unit for supplying a cleaning gas to the processing space to perform a plasma cleaning in the processing chamber without the target object;
a first high frequency power supply unit for supplying a first high frequency power to the first electrode, the first high frequency power contributing to plasma generation of the etching gas or the cleaning gas; and
a controller for controlling the first high frequency power supply unit such that a first period during which the first high frequency power has a first amplitude that generates the plasma and a second period during which the first high frequency power has a second amplitude that generates substantially no plasma are alternately repeated at a specific cycle when the plasma cleaning is performed in the processing chamber without the target object.
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Accused Products
Abstract
A plasma etching apparatus includes an electrostatic chuck and an etching gas supply unit for supplying an etching gas to a processing space between a first and a second electrode to perform a dry etching process on the target object. The apparatus further includes a cleaning gas supply unit for supplying a cleaning gas to a processing space; a first high frequency power supply unit for supplying a first high frequency power to the first electrode; and a controller for controlling the first high frequency power supply unit such that a first period during which the first high frequency power has a first amplitude that generates the plasma and a second period during which the first high frequency power has a second amplitude that generates substantially no plasma are alternately repeated at a specific cycle when the plasma cleaning is performed in the processing chamber without the target object.
434 Citations
26 Claims
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1. A plasma etching apparatus comprising:
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an evacuable processing chamber; a first electrode for mounting a target object in the processing chamber; an electrostatic chuck provided on a mounting surface of the first electrode to hold the target object by an electrostatic force, a dielectric material of a surface layer portion of the electrostatic chuck including a metal; a second electrode disposed to face the first electrode in parallel in the processing chamber; an etching gas supply unit for supplying an etching gas to a processing space between the first and the second electrode to perform a dry etching process on the target object; a cleaning gas supply unit for supplying a cleaning gas to the processing space to perform a plasma cleaning in the processing chamber without the target object; a first high frequency power supply unit for supplying a first high frequency power to the first electrode, the first high frequency power contributing to plasma generation of the etching gas or the cleaning gas; and a controller for controlling the first high frequency power supply unit such that a first period during which the first high frequency power has a first amplitude that generates the plasma and a second period during which the first high frequency power has a second amplitude that generates substantially no plasma are alternately repeated at a specific cycle when the plasma cleaning is performed in the processing chamber without the target object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A plasma cleaning method for performing a plasma cleaning in an evacuable processing chamber without a target object in a plasma etching apparatus including:
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the evacuable processing chamber; a first electrode for mounting a target object in the processing chamber; an electrostatic chuck provided on a mounting surface of the first electrode to hold the target object by an electrostatic force, a dielectric material of a surface layer portion of the electrostatic chuck including a metal; a second electrode disposed to face the first electrode in parallel in the processing chamber; an etching gas supply unit configured to supply an etching gas to a processing space between the first and the second electrode to perform a dry etching process on the target object; a cleaning gas supply unit for supplying a cleaning gas to the processing space to perform a plasma cleaning in the processing chamber without the target object; and a first high frequency power supply unit for supplying a first high frequency power to the first electrode, the first high frequency power contributing to plasma generation of the etching gas or the cleaning gas, wherein a first period during which the first high frequency power has a first amplitude that generates the plasma and a second period during which the first high frequency power has a second amplitude that generates substantially no plasma are alternately repeated at a specific cycle. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification