Review of suspected defects using one or more reference dies
First Claim
1. A system for reviewing a wafer, the system comprising:
- a memory unit configured to store information about locations of a set of suspected defects that are located at multiple dice of the wafer;
electron optics configured to obtain images of reference elements located within a first reference die of the wafer;
a processor configured to;
compare a first sub-set of suspected defects to a first sub-set of reference elements to provide a first evaluation result; and
select, in response to the first evaluation result, a source of a second sub-set of reference elements;
wherein the electron optics are further configured to obtain images of a second sub-set of reference elements that are located within a second reference die of the wafer when it is determined that the second reference die is the source of the second sub-set of reference elements; and
wherein the processor is further configured to compare a second sub-set of suspected defects to the second sub-set of reference elements to provide a second evaluation result.
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Accused Products
Abstract
A system for reviewing a wafer, the system may include a memory unit that is configured to store information about locations of a set of suspected defects that are located at multiple dice of the wafer; electron optics that is configured to obtain images of reference elements, wherein the reference elements are located within a first reference die of the wafer; and a processor that is configured to: compare the first sub-set of suspected defects to a first sub-set of reference elements to provide a first evaluation result; and select, in response to the first evaluation result, a source of a second sub-set of reference elements. The electron optics is further configured to obtain images of a second sub-set of reference elements that are located within a second reference die of the wafer when it is determined that the second reference die is the source of the second sub-set of reference elements. The processor is further configured to compare the second sub-set of suspected defects to the second sub-set of reference elements to provide a second evaluation result.
22 Citations
15 Claims
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1. A system for reviewing a wafer, the system comprising:
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a memory unit configured to store information about locations of a set of suspected defects that are located at multiple dice of the wafer; electron optics configured to obtain images of reference elements located within a first reference die of the wafer; a processor configured to; compare a first sub-set of suspected defects to a first sub-set of reference elements to provide a first evaluation result; and select, in response to the first evaluation result, a source of a second sub-set of reference elements; wherein the electron optics are further configured to obtain images of a second sub-set of reference elements that are located within a second reference die of the wafer when it is determined that the second reference die is the source of the second sub-set of reference elements; and wherein the processor is further configured to compare a second sub-set of suspected defects to the second sub-set of reference elements to provide a second evaluation result.
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2. A method for reviewing a wafer, the method comprising:
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receiving information about locations of a set of suspected defects that are located at multiple dice of the wafer; obtaining images of reference elements, wherein the reference elements are located within a first reference die of the wafer; obtaining images of a first sub-set of suspected defects; comparing the first sub-set of suspected defects to a first sub-set of reference elements to provide a first evaluation result; selecting, in response to the first evaluation result, a source of a second sub-set of reference elements; obtaining images of a second sub-set of reference elements that are located within a second reference die of the wafer when it is determined that the second reference die is the source of the second sub-set of reference elements; obtaining images of a second sub-set of suspected defects; and comparing the second sub-set of suspected defects to the second sub-set of reference elements to provide a second evaluation result. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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9. A non-transitory computer readable medium that stores instructions that once executed by a computer cause the computer to:
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receive information about locations of a set of suspected defects that are located at multiple dice of a wafer; obtain images of reference elements, wherein the reference elements are located within a first reference die of the wafer; obtain images of a first sub-set of suspected defects; compare the first sub-set of suspected defects to a first sub-set of reference elements to provide a first evaluation result; select, in response to the first evaluation result, a source of a second sub-set of reference elements; obtain images of a second sub-set of reference elements that are located within a second reference die of the wafer when it is determined that the second reference die is the source of the second sub-set of reference elements; obtain images of a second sub-set of suspected defects; and compare the second sub-set of suspected defects to the second sub-set of reference elements to provide a second evaluation result.
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10. A method for reviewing a wafer, the method comprising:
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receiving or selecting a set of reference dice of a wafer, wherein the set of reference dice is selected in response to at least one out of;
process variations associated with the wafer, deviations between review results related to different dice of a group of dice of the wafer, locations of the dice of the group of dice, and timing constraints associated with reviewing of suspected defects that are located in a group of dice of the wafer; andreviewing the suspected defects using reference images obtained from the set of reference dice; and
wherein the set of reference dice comprises fewer dice than the group of dice. - View Dependent Claims (11, 12, 13)
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14. A non-transitory computer readable medium that stores instructions that once executed by a computer cause the computer to:
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receive or select a set of reference dice of a wafer, wherein the set of reference dice is selected in response to at least one out of;
process variations associated with the wafer;deviations between review results related to different dice of a group of dice of the wafer, locations of the dice of the group of dice, and timing constraints associated with reviewing of suspected defects that are located in a group of dice of the wafer; and reviewing the suspected defects using reference images obtained from the set of reference dice; wherein the set of reference dice comprises fewer dice than the group of dice.
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15. A system for reviewing a wafer, the system comprising:
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a processor that is configured receive or select a set of reference dice of a wafer, wherein the set of reference dice is selected in response to at least one out of;
process variations associated with the wafer, deviations between review results related to different dice of a group of dice of the wafer, locations of the dice of the group of dice, and timing constraints associated with reviewing of suspected defects that are located in a group of dice of the wafer; andelectron optics that is configured to obtain reference images obtained from the set of reference dice; wherein the processor is further configured to review the suspected defects using the reference images obtained from the set of reference dice; and wherein the set of reference dice comprises fewer dice than the group of dice.
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Specification