Wet cleaning of electrostatic chucks
First Claim
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1. A method of cleaning an electrostatic chuck useful for plasma etching of a dielectric layer on a semiconductor substrate, the chuck including a ceramic surface on which the semiconductor substrate is supported during the etching, the method comprising the steps of:
- a) contacting at least the ceramic surface of the chuck with isopropyl alcohol;
b) contacting at least the ceramic surface of the chuck with a dilute acidic solution comprising a hydrofluoric acid and nitric acid mixture and/or a dilute acidic solution comprising a hydrochloric acid and hydrogen peroxide mixture;
c) contacting at least the ceramic surface of the chuck with basic solution comprising hydrogen peroxide and ammonium hydroxide; and
d) subjecting the chuck to ultrasonic cleaning;
wherein contaminants are removed from the ceramic surface of the chuck.
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Abstract
A non-destructive and simple method for cleaning a new or used electrostatic chuck comprises a wet cleaning process, which removes contaminants deposited on a surface of the electrostatic chuck.
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Citations
21 Claims
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1. A method of cleaning an electrostatic chuck useful for plasma etching of a dielectric layer on a semiconductor substrate, the chuck including a ceramic surface on which the semiconductor substrate is supported during the etching, the method comprising the steps of:
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a) contacting at least the ceramic surface of the chuck with isopropyl alcohol; b) contacting at least the ceramic surface of the chuck with a dilute acidic solution comprising a hydrofluoric acid and nitric acid mixture and/or a dilute acidic solution comprising a hydrochloric acid and hydrogen peroxide mixture; c) contacting at least the ceramic surface of the chuck with basic solution comprising hydrogen peroxide and ammonium hydroxide; and d) subjecting the chuck to ultrasonic cleaning; wherein contaminants are removed from the ceramic surface of the chuck. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification