Film thickness measuring method of member to be processed using emission spectroscopy and processing method of the member using the measuring method
First Claim
1. A film thickness measuring method for measuring a film thickness of a member to be processed, comprising the steps of:
- a) setting a standard pattern consisting of a time differential value of an interference light for each of multiple wavelengths with respect to a film thickness of a first member to be processed;
b) measuring an intensity of an interference light for each of multiple wavelengths of a second member being processed, composed just like said first member, to obtain a real pattern consisting of time differential values of measured interference light intensities; and
c) obtaining a film thickness of said second member according to said standard pattern consisting of said time differential values and said real pattern consisting of said time differential values.
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Accused Products
Abstract
A standard pattern of a differential value of an interference light is set with respect to a predetermined film thickness of a first member to be processed. The standard pattern uses a wavelength as a parameter. Then, an intensity of an interference light of a second member to be processed, composed just like the first member, is measured with respect to each of a plurality of wavelengths so as to obtain a real pattern of an differential value of the measured interference light intensity. The real pattern also uses a wavelength as a parameter. Then, the film thickness of the second member is obtained according to the standard pattern and the real pattern of the differential value.
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Citations
7 Claims
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1. A film thickness measuring method for measuring a film thickness of a member to be processed, comprising the steps of:
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a) setting a standard pattern consisting of a time differential value of an interference light for each of multiple wavelengths with respect to a film thickness of a first member to be processed;
b) measuring an intensity of an interference light for each of multiple wavelengths of a second member being processed, composed just like said first member, to obtain a real pattern consisting of time differential values of measured interference light intensities; and
c) obtaining a film thickness of said second member according to said standard pattern consisting of said time differential values and said real pattern consisting of said time differential values. - View Dependent Claims (2)
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3. A processing method for a member to be processed, comprising the steps of:
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setting a standard pattern consisting of a time differential value of an interference light for each of multiple wavelengths with respect to a film thickness of a first member to be processed;
measuring an intensity of an interference light for each of multiple wavelengths of a second member being processed, composed just like said first member, with respect to each of the multiple wavelengths so as to obtain a real pattern consisting of time differential values of the measured interference light intensities;
obtaining a film thickness of said second member according to said standard pattern consisting of said time differential values and said real pattern consisting of said time differential values; and
performing the next processing according to the film thickness of said second member obtained.
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4. A method for etching a member to be processed, placed on a sample stand by plasma in a vacuum chamber, comprising the steps of:
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setting a standard pattern consisting of time differential values of interference lights of multiple wavelengths with respect to a film thickness of a first member to be processed;
measuring an intensity of an interference light of multiple wavelengths of a second member being processed, composed Just like said first member, with respect to each of the multiple wavelengths so as to obtain a real pattern consisting of time differential values of the measured interference light Intensities;
obtaining a film thickness of said second member according to said standard pattern consisting of said time differential values and said real pattern consisting of said time differential values; and
etching said second member while controlling etching conditions according to the film thickness of said second member obtained.
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5. A method for measuring a film thickness of a member to be processed, comprising the steps of:
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setting a standard pattern of time differential values of a wavelength at a zero-cross point and at least one more wavelength of an interference light with respect to a film thickness of a first member to be processed;
measuring the intensity of an interference light of a second member being processed, composed just like said first member, with respect to each of a plurality of wavelengths so as to obtain a wavelength at a zero-cross point in a real pattern of a time differential value of the measured interference light intensity and a time differential value of a real pattern in at least one more wavelength; and
obtaining a film thickness of said second member according to matching of a wavelength at said zero-cross point between said standard pattern and said real pattern of said time differential value and according to matching with a time differential value of at least one more wavelength.
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6. A method for measuring a film thickness of a member to be processed, comprising the steps of:
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setting a standard waveform pattern or a zero-cross waveform pattern of a time differential value of an interference light with respect to a film thickness of a first member to be processed and with respect to each of a plurality of wavelengths;
measuring the intensity of an interference light of a second member being processed, composed just like said first member, with respect to each of a plurality of wavelengths so as to obtain an actual waveform pattern or zero-cross waveform pattern of a time differential value of each wavelength of the measured Interference light intensity; and
comparing said standard pattern with said actual pattern so as to obtain a film thickness of said second member.
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7. A method for measuring a film thickness of a member to be processed, comprising the steps of:
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selecting specific wavelengths of an interference light of a second member to be processed, as guide and target wavelengths;
obtaining a film thickness range of said second member from a guide wavelength time differential value zero-cross pattern of an interference light of a first member being processed, composed just like said second member, according to said guide wavelength with respect to a film thickness; and
obtaining a film thickness of said second member within said film thickness range from a zero-cross waveform pattern of said time differential value of said interference light intensity having said target wavelength.
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Specification