Failure detection system, failure detection method, and computer program product
First Claim
1. A failure detection system, comprising:
- a wafer test information input unit configured to acquire pass/fail maps for respective wafers for a plurality of types of semiconductor devices, the pass/fail maps displaying failure chip areas based on results of a plurality of electrical tests performed on a plurality of chip areas assigned on the respective wafers;
an analogous test information input unit configured to classify the electrical tests into a plurality of analogous electrical tests with regard to analogous failures among the plurality of types of semiconductor devices;
a subarea setting unit configured to assign a plurality of subareas, each of which is common to the types of semiconductor devices on a surface of the wafer;
a characteristic quantity calculation unit configured to statistically calculate characteristic quantities based on a number of the failure chip areas included in the respective subareas for each of the analogous electrical tests; and
a categorization unit configured to obtain correlation coefficients between the characteristic quantities corresponding to the respective subareas of the wafers, and to classify clustering failure patterns of the failure chip areas into categories by comparing the correlation coefficients with a threshold value.
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Accused Products
Abstract
A failure detection system includes a wafer test information input unit which acquires pass/fail maps for wafers for a plurality of types of semiconductor devices, displaying failure chip areas based on results of electrical tests performed on chips; an analogous test information input unit which classifies the electrical tests into analogous electrical tests with regard to analogous failures among the semiconductor devices; a subarea setting unit which assigns subareas common to the types of semiconductor devices on a wafer surface; a characteristic quantity calculation unit which statistically calculates characteristic quantities based on a number of the failure chip areas included in the subareas for each analogous electrical test; and a categorization unit which obtains correlation coefficients between the characteristic quantities corresponding to the subareas, and classifies clustering failure patterns of the failure chip areas into categories by comparing the correlation coefficients with a threshold.
26 Citations
20 Claims
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1. A failure detection system, comprising:
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a wafer test information input unit configured to acquire pass/fail maps for respective wafers for a plurality of types of semiconductor devices, the pass/fail maps displaying failure chip areas based on results of a plurality of electrical tests performed on a plurality of chip areas assigned on the respective wafers; an analogous test information input unit configured to classify the electrical tests into a plurality of analogous electrical tests with regard to analogous failures among the plurality of types of semiconductor devices; a subarea setting unit configured to assign a plurality of subareas, each of which is common to the types of semiconductor devices on a surface of the wafer; a characteristic quantity calculation unit configured to statistically calculate characteristic quantities based on a number of the failure chip areas included in the respective subareas for each of the analogous electrical tests; and a categorization unit configured to obtain correlation coefficients between the characteristic quantities corresponding to the respective subareas of the wafers, and to classify clustering failure patterns of the failure chip areas into categories by comparing the correlation coefficients with a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A failure detection method, comprising:
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manufacturing wafers having a plurality of types of semiconductor devices in manufacturing equipment; acquiring pass/fail maps displaying failure chip areas based on results of a plurality of electrical tests performed on a plurality of chip areas assigned on the respective wafers; classifying the electrical tests into a plurality of analogous electrical tests with regard to analogous failures among the plurality of types of semiconductor devices; assigning a plurality of subareas, each of which is common to the types of semiconductor devices on a surface of the wafer; statistically calculating characteristic quantities based on a number of the failure chip areas included in the respective subareas for each of the analogous electrical tests; and obtaining correlation coefficients between the characteristic quantities of the wafers corresponding to the subareas to classify clustering failure patterns of the failure chip areas into categories by comparing the correlation coefficients with a threshold value. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A computer program product stored on a computer-readable medium of a computer and configured to be executed by a computer, comprising:
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an instruction of acquiring pass/fail maps for respective wafers of a plurality of types of semiconductor devices, the pass/fail maps displaying failure chip areas based on results of a plurality of electrical tests performed on a plurality of chip areas assigned on each of the respective wafers; an instruction of classifying the electrical tests into a plurality of analogous electrical tests with regard to analogous failures among the plurality of types of semiconductor devices; an instruction of assigning a plurality of subareas, each of which is common to the types of semiconductor devices on a surface of the wafer; an instruction of statistically calculating characteristic quantities based on a number of the failure chip areas included in the respective subareas for each of the analogous electrical tests; and an instruction of obtaining correlation coefficients between the characteristic quantities of the wafers corresponding to the respective subareas to classify clustering failure patterns of the failure chip areas into categories by comparing the correlation coefficients with a threshold value. - View Dependent Claims (20)
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Specification