Apparatus for measuring a three-dimensional shape
First Claim
1. An apparatus for measuring a three-dimensional shape, comprising:
- an electron beam irradiation means for scanningly irradiating a specimen with a condensed electron beam;
a signal detecting means comprising a secondary electron detecting unit for detecting secondary electrons generated from said specimen upon irradiation with said electron beam; and
a signal computing means for computing a signal from said signal detecting means;
wherein said signal computing means has the function of dividing a signal waveform obtained by said signal detecting means into a plurality of regions based on variation in the signal amount, and evaluating the three-dimensional shape of said specimen according to the sizes of said divisional regions.
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Accused Products
Abstract
Conventionally, there is no method for quantitatively evaluating the three-dimensional shape of an etched pattern in a non-destructive manner and it takes much time and costs to determine etching conditions. With the conventional length measuring method only, it has been impossible to detect an abnormality in the three-dimensional shape and also difficult to control the etching process. According to the present invention, variations in signal amounts of an SEM image are utilized to compute three-dimensional shape data on the pattern associated with the etching process steps, whereby the three-dimensional shape is quantitatively evaluated. Besides, determination of etching process conditions and process control are performed based on the three-dimensional shape data obtained. The present invention makes it is possible to quantitatively evaluate the three-dimensional shape of the etched pattern in a non-destructive manner. Further, the efficiency of determining the etching process conditions and a stable etching process can be realized.
6 Citations
7 Claims
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1. An apparatus for measuring a three-dimensional shape, comprising:
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an electron beam irradiation means for scanningly irradiating a specimen with a condensed electron beam;
a signal detecting means comprising a secondary electron detecting unit for detecting secondary electrons generated from said specimen upon irradiation with said electron beam; and
a signal computing means for computing a signal from said signal detecting means;
wherein said signal computing means has the function of dividing a signal waveform obtained by said signal detecting means into a plurality of regions based on variation in the signal amount, and evaluating the three-dimensional shape of said specimen according to the sizes of said divisional regions. - View Dependent Claims (2, 3)
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4. An apparatus for measuring a three-dimensional shape, comprising:
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an electron beam irradiation means for scanningly irradiating a specimen with a condensed electron beam;
a signal detecting means comprising a secondary electron detecting means for detecting secondary electrons generated from said specimen upon irradiation with said electron beam; and
a signal computing means for computing a signal from said signal detecting means;
wherein said signal computing means has the function of dividing a signal waveform obtained by said signal detecting means into a plurality of regions based on variation in the signal amount, and estimating the three-dimensional shape of said specimen according to the sizes of said divisional regions. - View Dependent Claims (5, 6)
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7-12. -12. (canceled)
Specification