Charged particle beam system
First Claim
Patent Images
1. A scanning electron microscope comprising:
- a source of an electron beam;
an acceleration electrode for accelerating the electron beam;
a detector for detecting a signal generated based on an irradiation of the electron beam to a sample;
a negative voltage generator for applying a variable potential to the sample; and
a controller for controlling a plurality of voltage generators which include the negative voltage generator, the controller comprising a computer readable medium containing instructions, wherein the controller;
varies energy of electrons accelerated toward the source side by-an electric field formed by potential applied to the sample, in a potential state of the sample to which a potential larger than energy of the electron beam is given, andmeasures a surface potential of the sample in accordance with change of detectable amount of electrons by change of the energy of the electrons or change of brightness information by the signal.
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Abstract
A charged particle beam system wherein the output of the secondary electron detector is detected while the retarding voltage is varied between the values for which the secondary electrons do not reach the sample and the values for which the secondary electrons reach the sample, and the surface potential of the sample is determined on the basis of the relationship between the retarding voltage and the detected output of the secondary electron detector.
116 Citations
9 Claims
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1. A scanning electron microscope comprising:
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a source of an electron beam; an acceleration electrode for accelerating the electron beam; a detector for detecting a signal generated based on an irradiation of the electron beam to a sample; a negative voltage generator for applying a variable potential to the sample; and a controller for controlling a plurality of voltage generators which include the negative voltage generator, the controller comprising a computer readable medium containing instructions, wherein the controller; varies energy of electrons accelerated toward the source side by-an electric field formed by potential applied to the sample, in a potential state of the sample to which a potential larger than energy of the electron beam is given, and measures a surface potential of the sample in accordance with change of detectable amount of electrons by change of the energy of the electrons or change of brightness information by the signal. - View Dependent Claims (2, 3, 4, 5)
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6. A scanning electron microscope comprising:
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a source of an electron beam; an acceleration electrode for accelerating the electron beam; a detector for detecting a signal generated based on an irradiation of the electron beam to a sample; a negative voltage generator for applying a variable potential to the sample; and a controller for controlling a plurality of voltage generators which include the negative voltage generator, the controller comprising a computer readable medium containing instructions, wherein the controller; varies energy of electrons accelerated toward the source side by an electric field formed by potential applied to the sample, in a potential state of the sample to which a potential larger than energy of the electron beam is given, and controls a potential which is applied to the sample in accordance with change of detectable amount of electrons by change of the energy of the electrons or change of brightness information by the signal. - View Dependent Claims (7, 8, 9)
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Specification