Semiconductor device inspecting apparatus
First Claim
Patent Images
1. A semiconductor device inspecting apparatus, comprising:
- an electron gun for irradiating a area on a sample with electron beams to be inspected where a semiconductor device is formed;
an electron beam control section for controlling these electron beams;
current measuring equipment for measuring compensation current of secondary electrons generated by electron beams which have passed through contact holes in the inspected area and reached an underlying conductive layer;
a data processor for determining a reference for judging whether an inspected area is good or bad, which is a current value obtained by using said current measuring equipment when irradiating an area having one or more contact holes treated as the inspected area sequentially or collectively with electron beams; and
a storage device for storing said data processing result, wherein said storage device stores a background value, which is a current value obtained when irradiating an area made of the same material and having the same structure except that it has no contact hole in the same sample as for the area having the contact holes in said inspected area and the data processor performs data processing of subtracting said background value stored in the storage device from the current value obtained by said current measuring equipment when irradiating said area having one or more contact holes treated as the inspected area.
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Abstract
A semiconductor device inspecting apparatus capable of a high-precision nondestructive inspection with a reduction of external noises, by using a value of an area having no hole as a background value for a correction when measuring an average current, measuring the current in a current differential input amplifier constitution, automatically judging whether a result of the measurement is caused by a defect of the device or of the equipment on the basis of a measured current waveform, measuring a current value of electron beams, and storing and reusing a waiting time between irradiation with electron beams and stabilization of the current measurement value.
37 Citations
13 Claims
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1. A semiconductor device inspecting apparatus, comprising:
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an electron gun for irradiating a area on a sample with electron beams to be inspected where a semiconductor device is formed;
an electron beam control section for controlling these electron beams;
current measuring equipment for measuring compensation current of secondary electrons generated by electron beams which have passed through contact holes in the inspected area and reached an underlying conductive layer;
a data processor for determining a reference for judging whether an inspected area is good or bad, which is a current value obtained by using said current measuring equipment when irradiating an area having one or more contact holes treated as the inspected area sequentially or collectively with electron beams; and
a storage device for storing said data processing result, wherein said storage device stores a background value, which is a current value obtained when irradiating an area made of the same material and having the same structure except that it has no contact hole in the same sample as for the area having the contact holes in said inspected area and the data processor performs data processing of subtracting said background value stored in the storage device from the current value obtained by said current measuring equipment when irradiating said area having one or more contact holes treated as the inspected area.
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2. A semiconductor device inspecting apparatus, comprising:
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an electron gun for irradiating a area on a sample with electron beams to be inspected where a semiconductor device is formed;
current measuring equipment for measuring compensation current of secondary electrons generated by electron beams having reached an underlying conductive layer in said inspected area;
a data processor for determining a reference for judging whether an inspected area is good or bad, which is a current value obtained by using said current measuring equipment when irradiating an area having one or more contact holes treated as the inspected area sequentially or collectively with electron beams; and
a storage device for storing said data processing result, wherein said current measuring equipment has a first current/voltage exchanger connected to an electrode on which the sample is placed, a second current/voltage exchanger connected to an opposite electrode arranged in the vicinity of the sample to be inspected, and a differential amplifier for determining a difference between a measurement value of said first current/voltage exchanger and a measurement value of said second current/voltage exchanger; and
wherein the differential amplifier is connected to the data processor. - View Dependent Claims (3, 4, 5)
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6. A semiconductor device inspecting apparatus, comprising:
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an electron gun for irradiating a area on a sample with electron beams to be inspected where a semiconductor device is formed;
an electron beam control section for controlling these electron beams;
current measuring equipment for measuring compensation current of secondary electrons generated by electron beams having reached an underlying conductive layer in said inspected area;
a data processor for determining a reference for judging whether an inspected area is good or bad, which is a current value obtained by using said current measuring equipment when irradiating an area having one or more contact holes treated as the inspected area sequentially or collectively with electron beams; and
a storage device for storing said data processing result, wherein said data processor compares a current waveform obtained by using the current measuring equipment with a standard waveform previously stored in said storage device as a standard waveform when irradiating the predetermined area having one or more contact hole'"'"'s on the semiconductor device with electron beams by using said electron gun and, if the comparison result exceeds the predetermined range, determines whether it is caused by a defect of the inspected area or of the inspecting apparatus. - View Dependent Claims (7, 8, 9)
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10. A semiconductor device inspecting apparatus, comprising:
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an electron gun for irradiating a area on a sample with electron beams to be inspected where a semiconductor device is formed;
an electron beam control section for controlling these electron beams;
current measuring equipment for measuring compensation current of secondary electrons generated by electron beams having reached an underlying conductive layer in said inspected area;
a data processor for determining a reference for judging whether an inspected area is good or bad, which is a current value obtained by using said current measuring equipment when irradiating an area having one or more contact holes treated as the inspected area sequentially or collectively with electron beams; and
a storage device for storing said data processing result, wherein said storage device stores a current value of the electron beams having reached the inspected area from said electron gun for irradiating the electron beams by using a detector for a beam measurement of the current value; and
wherein said data processor corrects the current value obtained by using said current measuring equipment when irradiating an area having one or more contact holes treated as the inspected area sequentially or collectively with electron beams on the basis of the measurement value of the beam measurement. - View Dependent Claims (11)
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12. A semiconductor device inspecting apparatus, comprising:
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an electron gun for irradiating a area on a sample with electron beams to be inspected where a semiconductor device is formed;
an electron beam control section for controlling these electron beams;
current measuring equipment for measuring compensation current of secondary electrons generated by electron beams having reached an underlying conductive layer in said inspected area;
a data processor for determining a reference for judging whether an inspected area is good or bad, which is a current value obtained by using said current measuring equipment when irradiating an area having one or more contact holes treated as the inspected area sequentially or collectively with electron beams; and
a storage device for storing said data processing result, wherein said data processor reads and processes a current value in an area where the current is stabilized after the irradiation with the electron beams among measurement values obtained by using said current measuring equipment. - View Dependent Claims (13)
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Specification