Plasma etching method, plasma etching apparatus and storage medium
First Claim
1. A plasma etching method for forming a hole in an etching target film by using a plasma etching apparatus including an evacuable processing chamber configured to accommodate a processing target object therein;
- a lower electrode provided within the processing chamber and serving as a mounting table for the processing target object;
an upper electrode provided within the processing chamber and facing the lower electrode;
a processing gas supply unit configured to supply a processing gas into the processing chamber;
a plasma generation power unit configured to apply a plasma generation power to at least one of the upper electrode and the lower electrode; and
a first DC power supply configured to apply a negative DC voltage to the upper electrode, the method comprising;
turning on the plasma generation power unit while applying a first negative DC voltage from the first DC power supply; and
turning off the plasma generation power unit while applying a second negative DC voltage from the first DC power supply,wherein an absolute value of the second negative DC voltage is greater than an absolute value of the first negative DC voltage.
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Accused Products
Abstract
There is provided a plasma etching method capable of achieving a sufficient organic film modifying effect by high-velocity electrons. In forming a hole in an etching target film by plasma etching, a first condition of generating plasma within a processing chamber by way of turning on a plasma-generating high frequency power application unit and a second condition of not generating the plasma within the processing chamber by way of turning off the plasma-generating high frequency power application unit are repeated alternately. Further, a negative DC voltage is applied from a first DC power supply such that an absolute value of the applied negative DC voltage during a period of the second condition is greater than an absolute value of the applied negative DC voltage during a period of the first condition.
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Citations
16 Claims
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1. A plasma etching method for forming a hole in an etching target film by using a plasma etching apparatus including an evacuable processing chamber configured to accommodate a processing target object therein;
- a lower electrode provided within the processing chamber and serving as a mounting table for the processing target object;
an upper electrode provided within the processing chamber and facing the lower electrode;
a processing gas supply unit configured to supply a processing gas into the processing chamber;
a plasma generation power unit configured to apply a plasma generation power to at least one of the upper electrode and the lower electrode; and
a first DC power supply configured to apply a negative DC voltage to the upper electrode, the method comprising;turning on the plasma generation power unit while applying a first negative DC voltage from the first DC power supply; and turning off the plasma generation power unit while applying a second negative DC voltage from the first DC power supply, wherein an absolute value of the second negative DC voltage is greater than an absolute value of the first negative DC voltage. - View Dependent Claims (2, 3, 4, 5, 6)
- a lower electrode provided within the processing chamber and serving as a mounting table for the processing target object;
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7. A plasma etching method for forming a hole in an etching target film by using a plasma etching apparatus including an evacuable processing chamber configured to accommodate a processing target object therein;
- a lower electrode provided within the processing chamber and serving as a mounting table for the processing target object;
an upper electrode provided within the processing chamber and facing the lower electrode;
a processing gas supply unit configured to supply a processing gas into the processing chamber;
a plasma generation power unit configured to apply a plasma generation power to at least one of the upper electrode and the lower electrode; and
a first DC power supply configured to apply a negative DC voltage to the upper electrode, the method comprising;a first process and a second process, wherein the first process comprises; generating plasma within the processing chamber by way of continuously supplying the plasma generation power from the plasma generation power unit; and applying a negative DC voltage to the upper electrode from the first DC power supply when necessary, wherein the second process comprises; turning on the plasma generation power unit while applying a first negative DC voltage from the first DC power supply; and turning off the plasma generation power unit while applying a second negative DC voltage from the first DC power supply, wherein an absolute value of the second negative DC voltage is greater than an absolute value of the first negative DC voltage. - View Dependent Claims (8)
- a lower electrode provided within the processing chamber and serving as a mounting table for the processing target object;
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9. A plasma etching method for forming a hole in an etching target film by using a plasma etching apparatus including an evacuable processing chamber configured to accommodate a processing target object therein;
- a lower electrode provided within the processing chamber and serving as a mounting table for the processing target object;
an upper electrode provided within the processing chamber and facing the lower electrode;
a processing gas supply unit configured to supply a processing gas into the processing chamber;
a plasma generation power unit configured to apply a plasma generation power to at least one of the upper electrode and the lower electrode; and
a first DC power supply configured to apply a negative DC voltage to the upper electrode; and
a second DC power supply configured to apply a positive DC voltage to the lower electrode, the method comprising;a first operation of turning on the plasma generation power unit; a second operation of turning off the plasma generation power unit; at least during the second operation, applying a negative DC voltage to the upper electrode from the first DC power supply; and only during the second operation, applying a positive DC voltage to the lower electrode from the second DC power supply. - View Dependent Claims (10, 11, 12, 13, 14)
- a lower electrode provided within the processing chamber and serving as a mounting table for the processing target object;
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15. A plasma etching method for forming a hole in an etching target film by using a plasma etching apparatus including an evacuable processing chamber configured to accommodate a processing target object therein;
- a lower electrode provided within the processing chamber and serving as a mounting table for the processing target object;
an upper electrode provided within the processing chamber and facing the lower electrode;
a processing gas supply unit configured to supply a processing gas into the processing chamber;
a plasma generation power unit configured to apply a plasma generation power to at least one of the upper electrode and the lower electrode; and
a first DC power supply configured to apply a negative DC voltage to the upper electrode; and
a second DC power supply configured to apply a positive DC voltage to the lower electrode, the method comprising;a first process and a second process, wherein the first process comprises; generating plasma within the processing chamber by way of continuously supplying the plasma generation power from the plasma generation power unit; and applying a negative DC voltage to the upper electrode from the first DC power supply when necessary, wherein the second process comprises; a first operation of turning on the plasma generation power unit; a second operation of turning off the plasma generation power unit; at least during the second operation, applying a negative DC voltage to the upper electrode from the first DC power supply; and only during the second operation, applying a positive DC voltage to the lower electrode from the second DC power supply. - View Dependent Claims (16)
- a lower electrode provided within the processing chamber and serving as a mounting table for the processing target object;
Specification