Semiconductor fabricating apparatus with function of determining etching processing state
First Claim
1. A semiconductor fabricating apparatus for etching a semiconductor wafer having a film thereon and placed inside of a chamber using plasma generated inside of the chamber, the semiconductor fabricating apparatus comprising:
- a detector that detects a quantity of interference lights for each of at least two wavelengths obtained from a surface of the wafer for a predetermined time during the etching processing of the wafer; and
a determination unit that compares a predetermined value with an interval between a first time at which the detected quantity of the interference lights for one of the two wavelengths becomes one of a maximum and minimum and a second time at which the detected quantity of the interference lights for the other of the two wavelengths becomes one of a maximum and minimum, to determine a state of the etching, wherein both the first and second times are detected by using outputs of the detector.
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Accused Products
Abstract
When a semiconductor wafer placed in a chamber and having films thereon is etched using plasma generated in the chamber, a change in the amount of lights with at least two wavelengths, obtained from the wafer surface during the processing, is detected. The time between the time at which the amount of a light with one of two wavelengths is maximized and the time at which the amount of a light with the other wavelength is minimized is compared with a predetermined value to determine the state of etching processing.
30 Citations
5 Claims
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1. A semiconductor fabricating apparatus for etching a semiconductor wafer having a film thereon and placed inside of a chamber using plasma generated inside of the chamber, the semiconductor fabricating apparatus comprising:
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a detector that detects a quantity of interference lights for each of at least two wavelengths obtained from a surface of the wafer for a predetermined time during the etching processing of the wafer; and a determination unit that compares a predetermined value with an interval between a first time at which the detected quantity of the interference lights for one of the two wavelengths becomes one of a maximum and minimum and a second time at which the detected quantity of the interference lights for the other of the two wavelengths becomes one of a maximum and minimum, to determine a state of the etching, wherein both the first and second times are detected by using outputs of the detector. - View Dependent Claims (2, 3)
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4. A semiconductor fabricating apparatus for etching a semiconductor wafer placed inside of a chamber using plasma generated inside of the chamber, the semiconductor fabricating apparatus comprising:
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a detector that detects a quantity of interference lights for each of at least two wavelengths obtained from a surface of the wafer for a predetermined time during the etching processing of the wafer; and a control unit that compares a predetermined value with an interval between a first time at which the detected quantity of the interference lights for one of the two wavelengths output from the detector becomes one of a maximum and minimum and a second time at which the detected quantity of the interference lights for the other of the two wavelengths becomes one of a maximum and minimum to control the etching processing, both the first and second times being detected by using outputs of the detector. - View Dependent Claims (5)
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Specification