WO2021181863A1 - 判定装置、試験システム、判定方法および判定プログラム - Google Patents
判定装置、試験システム、判定方法および判定プログラム Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
- G06F11/26—Functional testing
- G06F11/27—Built-in tests
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/317—Testing of digital circuits
- G01R31/31707—Test strategies
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
- G06F11/26—Functional testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/008—Subject matter not provided for in other groups of this subclass by doing functionality tests
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/01—Subjecting similar articles in turn to test, e.g. "go/no-go" tests in mass production; Testing objects at points as they pass through a testing station
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2851—Testing of integrated circuits [IC]
- G01R31/2855—Environmental, reliability or burn-in testing
- G01R31/286—External aspects, e.g. related to chambers, contacting devices or handlers
- G01R31/2868—Complete testing stations; systems; procedures; software aspects
- G01R31/287—Procedures; Software aspects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2851—Testing of integrated circuits [IC]
- G01R31/2894—Aspects of quality control [QC]
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/30—Monitoring
- G06F11/34—Recording or statistical evaluation of computer activity, e.g. of down time, of input/output operation ; Recording or statistical evaluation of user activity, e.g. usability assessment
- G06F11/3409—Recording or statistical evaluation of computer activity, e.g. of down time, of input/output operation ; Recording or statistical evaluation of user activity, e.g. usability assessment for performance assessment
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N20/00—Machine learning
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P74/00—Testing or measuring during manufacture or treatment of wafers, substrates or devices
- H10P74/23—Testing or measuring during manufacture or treatment of wafers, substrates or devices characterised by multiple measurements, corrections, marking or sorting processes
Definitions
- the present invention relates to a determination device, a test system, a determination method, and a determination program.
- the device under test When testing the device under test, it may be erroneously determined that the test has failed due to poor contact or the like. Therefore, conventionally, the device under test that has failed the test is retested to prevent a decrease in yield.
- a determination device may include a result acquisition unit that acquires the test results of a plurality of items of tests performed on the device to be measured.
- the determination device may include a first determination unit that determines whether or not to retest the device under test that has failed the test.
- the first determination unit may make a determination based on the reproducibility of the test result when the test is performed on the plurality of devices under test a plurality of times in advance.
- the determination device may further include a calculation unit that calculates reproducibility for each of the plurality of items.
- the first determination unit may determine whether or not to retest the device under test that fails the test of the corresponding item based on the reproducibility calculated by the calculation unit.
- the first judgment unit may make a judgment using a learning model that has learned reproducibility.
- the calculation unit may have a learning model that outputs the prediction result of the retest according to the input of the test results of a plurality of items.
- the calculation unit may have a supply unit that supplies the test results of a plurality of items acquired by the result acquisition unit to the learning model.
- the calculation unit may have a reproducibility acquisition unit that acquires reproducibility from the prediction result of the retest output by the learning model in response to supplying the test results of a plurality of items to the learning model.
- the determination device may further include a learning processing unit that executes learning processing of the learning model using learning data including at least the item ID of the failed item among the plurality of items and the result of the retest.
- the determination device may further include a second determination unit that determines whether or not to relearn the learning model by using the result of the retest and the determination result of the first determination unit.
- the learning processing unit may execute the learning process of the learning model according to the determination result by the second determination unit.
- the calculation unit may calculate the reproducibility from the test results of a plurality of tests on a plurality of devices under test and the test results of a plurality of retests.
- the determination device may further include a second determination unit that determines whether or not to update the reproducibility by using the result of the retest and the determination result of the first determination unit.
- the calculation unit may update the reproducibility according to the determination result by the second determination unit.
- the determination device determines that the device under test is to be retested regardless of the determination result of the first determination unit in response to the test being performed on the device under test included in the lot of every few reference pieces.
- a third determination unit may be further provided. The second determination unit may make a determination using the result of the retest performed by the third determination unit.
- the determination device may further include a lower limit value acquisition unit that acquires an allowable lower limit value of the ratio of the device under test that passes the test. Based on the reproducibility of each item, the determination device calculates the predicted number of paths of the device under test that is predicted to pass at least the retest of the item among the devices under test that have failed the test of the corresponding item. Further parts may be provided. When the number of corresponding predicted passes is sequentially integrated according to the magnitude of reproducibility of each item, the first determination unit reproduces when the corresponding number of the allowable lower limit value is reached or the number of predicted passes immediately before reaching the corresponding number. A sex-based value may be used as the determination threshold.
- the determination device may further include an extraction unit that acquires a data file containing the test results and extracts the test results of each item from the data file.
- the determination device may further include a storage unit that stores the test results extracted by the extraction unit.
- the result acquisition unit may acquire test results of a plurality of items from the storage unit.
- test system may include the determination device of the first aspect.
- the test system may include a test device that tests a plurality of items on the device under test.
- a determination method may include a result acquisition step of acquiring the test results of a plurality of items of tests performed on the device to be measured.
- the determination method may include a first determination step of determining whether to retest the device under test that has failed the test. In the first determination step, the determination may be made based on the reproducibility of the test result when the test is performed on the plurality of devices under test a plurality of times in advance.
- a determination program may be executed by the computer to function as a result acquisition unit that acquires the test results of a plurality of items of tests performed on the device under test.
- the determination program may be itemized by the computer and cause the computer to function as a first determination unit for determining whether or not to retest the device under test that has failed the test.
- the first determination unit may make a determination based on the reproducibility of the test result when the test is performed on the plurality of devices under test a plurality of times in advance.
- the test system 1 according to this embodiment is shown.
- the test apparatus 200 is shown together with the wafer 101.
- the operation of the determination device 300 is shown together with the operation of the test device 200.
- the first determination process is shown.
- the determination device 300A according to the modified example is shown together with the test device 200 and the device under test 100.
- An example of a computer 2200 in which a plurality of aspects of the present invention may be embodied in whole or in part is shown.
- FIG. 1 shows a test system 1 according to the present embodiment.
- the test system 1 includes a device to be measured 100, a test device 200, and a determination device 300.
- the test device 200 and the determination device 300 may be integrally formed as a single device.
- the device to be measured 100 may be, for example, an electronic device such as a semiconductor or a Micro Electro Mechanical Systems (MEMS). A plurality of devices 100 to be measured may be formed on one wafer, the wafer may be diced into individual pieces to form a bare chip, or the device 100 may be sealed and packaged. good.
- MEMS Micro Electro Mechanical Systems
- the test device 200 tests one or more devices under test 100.
- the test apparatus 200 may perform a test of a single item, or may perform a test of a plurality of items (1000 to 2000 items as an example) in parallel or in sequence. Any two or more of the plurality of items included in the test may be test items belonging to the same category such as audio function when the device to be measured 100 is a packaged electronic device, for example. ..
- the test apparatus 200 sequentially tests a plurality of items on a plurality of devices under test 100 on a wafer.
- the test device 200 may be a device test device such as a system LSI tester, an analog tester, a logic tester, or a memory tester.
- the test device 200 gives various test signals to the device under test 100 and acquires response signals from the device 100 under test.
- the test device 200 may supply the data file obtained by the test of each item to the determination device 300 via wire or wireless.
- the test data file supplied from the test apparatus 200 may be in the format of STDF (Standard Test Data Form) as an example in the present embodiment, and the lot number and wafer number of the device to be measured 100 and the device of the device 100 to be measured.
- STDF Standard Test Data Form
- the ID, the item ID of the test item, the measured value for each item, the test result for each item may be included.
- the data file may be in the form of a data log or test log.
- an error may occur in the test result due to the surface stain of the device to be measured 100, poor contact of the test apparatus 200, etc., and the first test (also referred to as the first inspection). Even the device 100 to be measured, which is set as a fail in the above, may pass in the second test (also referred to as re-examination or re-test). Therefore, in the conventional test system, the device under test that has failed the initial inspection is retested to prevent a decrease in yield.
- the determination device 300 determines whether or not the device 100 to be measured that has failed the initial inspection should be re-examined. Note that failing the test may mean failing at least one item included in the test.
- the retest may be a so-called reprobe in which the test device 200 is brought into contact with the device to be measured 100 and the test is performed again. When the device 100 to be measured is fixed to the test device 200 and then the probe is brought into contact with the device 100 to be measured, the fixed state may or may not be released after the initial inspection.
- the determination device 300 includes an extraction unit 301, a storage unit 303, a result acquisition unit 305, a calculation unit 307, a lower limit value acquisition unit 309, a prediction unit 311, a threshold value determination unit 313, and a first determination unit 315.
- the extraction unit 301 acquires a test data file (STDF file as an example in this embodiment) from the test apparatus 200, and test results of each item from the data file (pass / fail determination value as an example in this embodiment). Is extracted.
- the extraction unit 301 extracts in advance the test results, the corresponding test item ID, the device ID and lot number of the device to be measured 100, and the like from the data file, and converts them into a CSV (comma-separated values) file. good.
- the extraction unit 301 may supply the extracted data to the storage unit 303.
- the storage unit 303 stores the test result (pass / fail determination value as an example in the present embodiment) extracted by the extraction unit 301.
- the storage unit 303 may further store the test item ID, the device ID of the device to be measured 100, the lot number, and the like in association with the test result.
- the data stored in the storage unit 303 may be readable by the result acquisition unit 305.
- the result acquisition unit 305 acquires the test results of a plurality of items performed on the device under test 100.
- the result acquisition unit 305 may acquire the test result from the storage unit 303.
- the result acquisition unit 305 may acquire the item ID of the item and the device ID of the device to be measured 100 from the storage unit 303 together with the test result of each item.
- the result acquisition unit 305 may supply the test results and the like for the initial inspection to the calculation unit 307 and the first determination unit 315.
- the calculation unit 307 calculates the reproducibility of the test result when the test is performed on the plurality of devices 100 to be measured a plurality of times (twice as an example in the present embodiment) in advance.
- the calculation unit 307 may supply the calculated reproducibility value to the first determination unit 315 and the prediction unit 311.
- the reproducibility may be an index showing how much the same test result (pass / fail determination value as an example in this embodiment) is reproduced. For example, how much the fail test result in the initial examination is reproduced in the re-examination. Indicates. The higher the reproducibility, the more likely it is that the re-examination will fail and the time required for the re-examination will be wasted. Therefore, the reproducibility may be an index indicating the ineffectiveness of the re-examination.
- the reproducibility may be the rate at which the fail test result is reproduced (also referred to as the reproducibility).
- the reproducibility may be the number of failures predicted in the retest (also referred to as the number of predicted retest failures).
- the number of predicted re-examination failures may be a value obtained by subtracting the number of predicted passes in the re-examination from the number of 100 devices to be measured (also referred to as the number of failed initial examinations) that failed in the initial examination, and is a reference number of devices to be measured. It may be a value obtained by multiplying the number of devices under test 100 that failed in the initial inspection with respect to 100 by the recall rate.
- the reference number may be the number of devices to be measured 100 included in the wafer, and may be 100 to 10000 as an example.
- the reproducibility may be a value for each of a plurality of items, and may indicate that the result of the re-examination is a fail when the result of the initial examination is a fail in one item.
- the fact that the re-examination becomes a fail may mean that any item included in the test fails, but it may also mean that the re-examination fails in the same item as the initial examination.
- the calculation unit 307 calculates the reproducibility using the learning model 371.
- the calculation unit 307 includes a learning model 371, a supply unit 373, and a reproducibility acquisition unit 375.
- the learning model 371 outputs the prediction result of the retest according to the input of the test results of a plurality of items.
- the learning model 371 may be generated by a learning process using learning data including the test results of the retest executed on the device under test whose initial test was a fail.
- the learning data may include at least the item ID of the failed item of each item of the test and the result of the retest. If the test of one item is a fail in the initial examination, the test result of the retest may show only the result of the test of the one item, or may show the result of the test of each item. Alternatively, only the overall results of the test may be shown.
- the training data may further include the position of the device to be measured 100 on the wafer, the amount of deviation between the measured value and the ideal value, and the like.
- the learning model 371 is a random forest machine learning algorithm as an example in this embodiment, but may be another machine learning algorithm including a support vector machine (SVM), a K-nearest neighbor method, logistic regression, and the like.
- SVM support vector machine
- K-nearest neighbor method K-nearest neighbor method
- logistic regression logistic regression
- the learning model 371 may be trained with the pass as 0 and the fail as 1 for the result of each item of the test, and the higher the possibility that the result of the retest will be a fail, the closer to 1 the value may be output.
- a test result that is, 1 indicating a fail is input for a test of a certain item
- the output value becomes close to 1 if the result of the retest is likely to fail again. Therefore, the output prediction result can show the reproducibility of each test item.
- the supply unit 373 supplies the learning model 371 with the test results of a plurality of items acquired by the result acquisition unit 305 (in the present embodiment, the test results of the first inspection as an example).
- the supply unit 373 may supply the item ID of the item together with the test result of each item.
- the reproducibility acquisition unit 375 acquires reproducibility from the re-examination prediction result output by the learning model 371 in response to the supply unit 373 supplying the test results of a plurality of items to the learning model 371.
- the reproducibility acquisition unit 375 may acquire the reproducibility by performing four arithmetic operations on the value of the prediction result of the re-examination, or may acquire the value of the prediction result itself as the reproducibility.
- the reproducibility acquisition unit 375 supplies the acquired reproducibility to the prediction unit 311 and the first determination unit 315.
- the reproducibility of each item is supplied to the prediction unit 311 regardless of the test result of the first inspection, and the reproducibility of the item failed in the first inspection (also referred to as the first inspection fail item) is determined by the first determination unit. Supply to 315.
- the lower limit value acquisition unit 309 acquires an allowable lower limit value of the ratio of the device under test 100 that passes the test.
- the allowable lower limit value may be set by the operator of the determination device 300 based on the yield of the device under test 100 to pass the test and the like.
- the allowable lower limit value may be 10% as an example.
- the lower limit value acquisition unit 309 may supply the acquired allowable lower limit value to the threshold value determination unit 313.
- the prediction unit 311 Based on the reproducibility of each item, the prediction unit 311 is predicted to pass at least the re-examination of the item among the devices under measurement 100 that have failed the test of the corresponding item (first inspection as an example in this embodiment). The number of predicted passes of the device to be measured 100 is calculated. For example, the prediction unit 311 may calculate the number of predicted passes of the device under test, which is predicted to pass the entire re-examination.
- the prediction unit 311 may calculate the number of prediction passes based on the reproducibility supplied from the calculation unit 307.
- the prediction unit 311 may supply the threshold value determination unit 313 in association with the reproducibility and the number of prediction paths for each item.
- the threshold value determination unit 313 determines a threshold value for determining whether or not to perform retesting from the reproducibility of each item and the number of predicted passes.
- the threshold value may be a reproducibility value.
- the threshold value determination unit 313 may supply the determined threshold value to the first determination unit 315.
- the first determination unit 315 determines whether or not to re-examine the device under test that has failed the test (first inspection as an example in this embodiment). Failing a test may mean failing at least one item included in the test. The first determination unit 315 may make a determination based on the reproducibility.
- the first determination unit 315 may determine whether or not to re-examine the device under test that has failed the test of the corresponding item based on the reproducibility of each item.
- the first determination unit 315 makes a determination using the test result of each item supplied from the result acquisition unit 305, the item ID of the item, and the device ID of the device to be measured 100. You can do it.
- the first determination unit 315 may use the learning model 371 that has learned the reproducibility and make a determination based on the reproducibility output from the learning model 371.
- the first determination unit 315 may use the threshold value determined by the threshold value determination unit 313 for determination.
- the device ID of the device to be measured 100 to be re-examined may be supplied to the test device 200.
- the test apparatus 200 re-examines the target device 100 to be measured.
- the re-examination may be re-examined for all items of the test.
- the determination device 300 it is determined based on the reproducibility of the test result whether to re-examine the device under test that has failed the test. Therefore, it is possible to efficiently perform the re-examination by eliminating the trouble of wastefully re-examining the device 100 to be measured that fails even if the re-examination is performed.
- the judgment is made using the learning model 371 that has learned the reproducibility of each item, the potential relationship between the test results between the items can be reflected in the judgment. Therefore, the accuracy of the determination can be improved and the re-examination can be performed efficiently.
- test results of a plurality of items are input to the learning model 371 and the prediction result of the re-examination showing the reproducibility is acquired, it is possible to surely acquire the highly accurate reproducibility and make a judgment.
- test results of each item are extracted from the test data file and stored in the storage unit 303, and the stored test results are acquired by the result acquisition unit 305. Therefore, unlike the case where the result acquisition unit 305 directly acquires the data file from the test apparatus 200 and extracts the test result, the processing speed by the result acquisition unit 305 can be increased.
- FIG. 2 shows the test apparatus 200 together with the wafer 101.
- the test apparatus 200 includes a tester main body 201, a test head 203, and a prober 205.
- the tester main body 201 is the main body of the test device 200 and controls various tests. For example, the tester main body 201 may perform the initial inspection of the device to be measured 100 and re-examine the device to be measured 100 based on the signal from the determination device 300.
- the test head 203 is connected to the tester main body 201 via a cable, and is configured to be driveable between a test position for testing the device under test 100 and a retracted position for which the test is not performed.
- the test head 203 transmits a test signal to the device under test 100 at the test position based on the control by the tester main body 201, receives a response signal from the device under test 100, and sends this to the tester main body.
- Relay to 201 The test head 203 may have a plurality of probe needles 231 in contact with the device under test 100 for electrical contact.
- the plurality of probe needles 231 are arranged corresponding to each of the plurality of electrode pads in some (four in the present embodiment) of the plurality of devices to be measured 100 formed on the wafer 101.
- the prober 205 conveys the wafer 101 and places it on the stage to align the wafer 101 with the test head 203.
- FIG. 3 shows the operation of the determination device 300 together with the operation of the test device 200.
- the determination device 300 determines the necessity of re-examination of the device to be measured 100 by performing the processes of steps S11 to S25.
- the broken line frame in the figure indicates the processing by the test apparatus 200.
- step S11 the test apparatus 200 tests each of the plurality of devices under test 100.
- the test apparatus 200 tests each of the reference number of devices under test 100, that is, all the devices under test 100 on the wafer 101.
- the test apparatus 200 may perform the initial inspection on the plurality of devices under test 100 that have not yet been tested.
- step S13 the extraction unit 301 acquires a data file (STDF file as an example in this embodiment) from the test apparatus 200, extracts the test results of each item, and the storage unit 303 stores the test results.
- STDF file as an example in this embodiment
- the device ID of the device to be measured 100, the test item ID, and the like may be further extracted by the extraction unit 301 and stored in the storage unit 303.
- step S15 the result acquisition unit 305 acquires the test result from the storage unit 303.
- the result acquisition unit 305 may further acquire the device ID of the device to be measured 100, the item ID of the test, and the like together with the test result.
- step S17 the first determination unit 315 determines whether or not all of the reference number of devices under measurement 100 tested in step S11 have passed the test. In the present embodiment, as an example, the first determination unit 315 determines whether or not all the devices under test 100 on the wafer 101 have passed all the items of the test. If it is determined in step S17 that all the devices under test have passed the test (step S17; Yes), the process proceeds to step S11. As a result, the test apparatus 200 tests the device 100 to be measured on the next wafer 101. If it is determined in step S17 that all the devices under test have not passed the test (step S17; No), the process proceeds to step S19.
- step S19 the first determination unit 315 performs a determination process of whether or not to re-examine the device under test that failed the test in step S11. Details of the process in step S19 will be described later.
- step S21 the first determination unit 315 determines whether or not the determination to perform the re-examination has been made. When it is determined that the re-examination is not performed for all the devices under test (step S21; Yes), the process shifts to step S11. As a result, the test apparatus 200 tests the device 100 to be measured on the next wafer 101. When it is determined in step S21 that at least one device under test 100 is to be retested (step S21; Yes), the process proceeds to step S23.
- step S23 the test apparatus 200 performs a re-examination of one or a plurality of devices under measurement 100 for which a determination to perform a re-examination has been made. Re-examination may be performed for each item of the test.
- the test apparatus 200 When the test apparatus 200 can perform a test on a plurality of the devices under test 100 at the same time, the test apparatus 200 is the device under test that is determined to be re-examined among the devices under test 100.
- the test may be performed on only 100.
- the test apparatus 200 contacts each probe needle 231 with each device under test at a corresponding position. A current may be passed only through the probe needle 231 in contact with the device to be measured 100 to be re-examined.
- step S25 in the same manner as in step S13 described above, the extraction unit 301 acquires a data file (STDF file as an example in this embodiment) from the test apparatus 200, extracts the test results of each item, and the storage unit 303 extracts the test results. Memorize the test results.
- the process of step S25 may shift to step S11. As a result, the test apparatus 200 tests the device 100 to be measured on the next wafer 101.
- FIG. 4 shows the first determination process.
- the determination device 300 determines whether or not to perform a re-examination of the device under test 100 by performing the processes of steps S101 to S107.
- step S101 the lower limit value acquisition unit 309 acquires an allowable lower limit value preset by the operator of the determination device 300.
- the lower limit value acquisition unit 309 may acquire the allowable lower limit value.
- step S102 the calculation unit 307 calculates the reproducibility for each of the plurality of items.
- the calculation unit 307 may calculate the reproducibility using the learning model 371.
- the prediction unit 311 calculates the number of predicted passes for each item based on the reproducibility of each item. As an example, when the reproducibility indicates the recall rate of the fail, the prediction unit 311 may calculate the number of predicted passes from the following equation (1) for each item. When the reproducibility indicates the number of re-examination predicted failures, the prediction unit 311 may calculate the number of predicted passes from the following equation (2) for each item.
- the threshold value determination unit 313 determines a threshold value for determining whether or not to perform retesting from the reproducibility of each item and the number of predicted passes. For example, the threshold value determination unit 313 detects the number of predicted passes when the integration result reaches the corresponding number of the allowable lower limit value when the number of corresponding predicted passes is sequentially integrated according to the magnitude of reproducibility of each item. good. Instead of this, the threshold value determination unit 313 may detect the number of predicted passes immediately before the integration result reaches the corresponding number of the allowable lower limit value. The threshold value determination unit 313 may determine a value based on reproducibility corresponding to the number of detected predicted passes as a threshold value.
- accumulating the number of predicted passes in order according to the magnitude of reproducibility may mean accumulating the number of predicted passes in descending order of reproducibility, and in the present embodiment, as an example, in descending order of reproducibility. It is to integrate the number of predicted passes.
- the value based on reproducibility may be a value obtained by performing four arithmetic operations on the reproducibility value, but in the present embodiment, the reproducibility value itself is an example. In this case, by comparing the threshold value with the reproducibility of each item, it is possible to determine whether or not to re-examine the device under test that fails the item.
- step S107 the first determination unit 315 determines, for each item, whether or not to re-examine the device under measurement 100 that has failed the test of the item.
- the first determination unit 315 makes a determination using the reproducibility of each initial inspection fail item supplied from the reproducibility acquisition unit 375 of the calculation unit 307 and the threshold value for the reproducibility supplied from the threshold value determination unit 313. You may go.
- the first determination unit 315 determines that the device 100 to be measured that fails the item is not re-examined, and determines that the reproducibility of the initial inspection fail item is not performed. If is smaller than the threshold value, it may be determined that the device 100 to be measured that fails the item is retested.
- the first determination unit 315 detects the device ID of the device under test 100 that fails the reproducibility item whose reproducibility of the initial inspection fail item is smaller than the threshold value among the device IDs acquired from the result acquisition unit 305. It may be supplied to the test apparatus 200 as a target for re-examination.
- the ratio of the device under test 100 that passes the test can be set to the allowable lower limit value or more.
- the reproducibility of the test may differ depending on the processing process applied to the device 100 to be measured. For example, the reproducibility may differ between the device 100 to be measured that has undergone the low temperature treatment and the device 100 to be measured that has undergone the high temperature treatment. Therefore, when the device to be measured 100 subjected to the separate processing steps is included in the test target, it is preferable that the first determination process is performed using a separate learning model 371 for each processed process.
- FIG. 5 shows the determination device 300A according to the modified example together with the test device 200 and the device under test 100.
- the determination device 300A further includes a first determination unit 315A, a result acquisition unit 305A, a third determination unit 317, a second determination unit 319, and a learning processing unit 321.
- substantially the same reference numerals as those of the determination device 300 shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.
- the first determination unit 315A has the same configuration as the first determination unit 315 described above, but supplies the determination result to the second determination unit 319 as well.
- the result acquisition unit 305A has the same configuration as the result acquisition unit 305 described above, but further acquires the lot number of the device to be measured 100 from the storage unit 303 together with the test results and the like. Further, the result acquisition unit 305A supplies the lot number and the device ID to the third determination unit 317 in association with each other. Further, the result acquisition unit 305A acquires the test result of the initial test corresponding to the device ID supplied from the third determination unit 317 and the test result of the re-examination from the storage unit 303 in association with the item ID of the test item. Then, it is supplied to the second determination unit 319.
- the third determination unit 317 determines whether or not to re-examine the device under test 100.
- the third determination unit 317 may determine that the re-examination is to be performed regardless of the determination result of the first determination unit 315.
- the third determination unit 317 may determine that the re-examination is performed according to the test being performed on the device to be measured 100 included in the lot of every reference number (4 as an example in this embodiment). ..
- the third determination unit 317 is concerned when the initial inspection is performed on each device 100 to be measured included in the next lot (fifth lot as an example in this embodiment) of several reference lots. It may be determined that the device to be measured 100 is to be re-examined.
- the third determination unit 317 may make a determination between the above-mentioned step S15 and step S17.
- the third determination unit 317 may detect the change of the lot number based on the lot number supplied from the result acquisition unit 305A and count the number of tested lots. The third determination unit 317 performs the initial inspection from the time when the number of tested lots reaches the reference number (4 in the present embodiment) to the time when the next number (5 in the present embodiment) is reached. It may be determined that the device to be measured 100 is to be re-examined. The third determination unit 317 may extract the device ID of the device to be measured 100 to be re-examined from the device ID supplied from the result acquisition unit 305A and supply it to the test apparatus 200. As a result, the test apparatus 200 re-examines the target device 100 to be measured.
- the third determination unit 317 may also supply the device ID of the device to be measured 100 to be re-examined to the result acquisition unit 305A.
- the test result of the initial test corresponding to the device ID and the test result of the retest are associated with the item ID of each item of the test and supplied to the second determination unit 319.
- the second determination unit 319 determines whether or not to relearn the learning model 371 by using the result of the re-examination and the determination result of the first determination unit 315.
- the result of the re-examination used by the second determination unit 319 may be the result of the re-examination performed by the third determination unit 317, but may be the result of the re-examination performed by the first determination unit 315.
- the second determination unit 319 includes the determination result of the first determination unit 315 (in the present embodiment, the device ID of the device under test determined to be the target of re-examination as an example) and the device ID supplied from the result acquisition unit 305A. From the test result of the re-examination, the values of TP (True Positive), TN (True Negative), FP (False Positive), and FN (False Negative) may be calculated.
- the TP may be the number of devices to be measured 100 that have been determined to be retested and have passed the retest.
- the TN may be the number of devices to be measured 100 that have been determined not to perform the retest and have failed the retest.
- the FP may be the number of devices to be measured 100 that have been determined to perform the re-examination and have failed the re-examination.
- the FN may be the number of devices to be measured 100 that are determined not to be retested and have passed the retest.
- the second determination unit 319 determines when at least one of a condition for preventing a decrease in yield (also referred to as a yield condition) and a condition for reducing the number of retests (also referred to as a retest reduction condition) is not satisfied. A determination to relearn may be made.
- the yield may be the ratio of the device to be measured 100 that passes the test (or re-examination) out of all the devices to be measured 100 to be subjected to the test.
- the yield condition is the number of measured devices 100 (FN + TP) that pass when all the measured devices 100 are re-examined, and the number of measured devices 100 (TP) that are determined to be re-examined and passed the re-examination.
- the condition may be that the ratio is greater than the threshold. That is, the yield condition may be expressed by TP / (FN + TP) ⁇ TH1 using the threshold value (TH1).
- the retest reduction condition may be a condition that the ratio of the number of devices to be measured (TN + FP + FN + TP) failed in the initial test to the number of devices 100 to be measured (TN + FN) not retested is larger than the threshold value. That is, the re-examination reduction condition may be expressed by (TN + FN) / (TN + FP + FN + TP) ⁇ TH2 using the threshold value (TH2).
- the second determination unit 319 may supply the learning data extracted from the data acquired from the result acquisition unit 305A to the learning processing unit 321.
- the learning processing unit 321 executes the learning process of the learning model 371 using the learning data including at least the item ID of the failed item among each item of the test and the result of the retest.
- the learning processing unit 321 may execute the learning process of the learning model 371 according to the determination result by the second determination unit 319.
- the learning processing unit 321 may perform the learning processing in response to the learning data being supplied from the second determination unit 319.
- the learning processing unit 321 may further execute the learning process by further using the learning data including the position of the device 100 to be measured on the wafer and the amount of deviation between the measured value and the ideal value.
- the learning processing unit 321 may acquire these data from the result acquisition unit 305A or the second determination unit 319.
- the learning process of the learning model 371 is performed by the learning processing unit 321, so that the accuracy of reproducibility can be further improved.
- the second determination unit 319 determines whether or not to relearn the learning model 371 using the result of the re-examination and the determination result of the first determination unit 315. Therefore, when the determination accuracy of the first determination unit 315 is low, the learning model 371 can be relearned to improve the determination accuracy of the first determination unit 315.
- the re-examination is forcibly performed every time the test of the device 100 to be measured with the reference lot number is performed, the accuracy of reproducibility and the learning accuracy of the learning model 371 can be surely maintained high.
- the determination device 300 has been described as having a calculation unit 307, a lower limit value acquisition unit 309, a prediction unit 311 and a threshold value determination unit 313. You may not do it.
- the determination device 300 may acquire the reproducibility, the number of predicted paths, and the threshold value calculation results from the externally connected calculation unit 307, prediction unit 311, and threshold value determination unit 313. Further, the determination device 300 may make a determination by the first determination unit 315 without using the predicted number of passes or the threshold value. As an example, the first determination unit 315 may determine that the device under test that fails the item of the reference number having high reproducibility is not re-examined.
- the result acquisition unit 305 has been described as acquiring the test result or the like from the test apparatus 200 via the extraction unit 301 and the storage unit 303, it may be acquired directly from the test apparatus 200. In this case, the result acquisition unit 305 may acquire the test data of the data file (STDF file as an example) and extract the test result or the like from the data file. In this case, the determination device 300 does not have to have the extraction unit 301.
- the number of predicted passes for each item calculated by the prediction unit 311 is described as the number of devices to be measured that are predicted to pass the re-examination of the item among the devices 100 to be measured that fail the initial inspection of the item. However, it may be a number indicating another value.
- the number of predicted passes for each item may be the number of devices to be measured that are predicted to pass the entire re-examination among the devices to be measured that have failed the initial inspection of the item.
- the reproducibility was explained as a value for each test item, it may be a value corresponding to the entire test. In this case, the reproducibility may indicate that the result of the re-examination is a fail if the result of the initial examination is a fail.
- the calculation unit 307 may calculate the reproducibility from the test results of a plurality of tests on the plurality of devices 100 to be measured and the test results of a plurality of retests.
- the calculation unit 307 uses the results of the initial inspection and the re-examination of the plurality of devices 100 to be measured, and calculates the recall rate from the ratio of the number of failures in the initial examination and the number of failures in the re-examination for each item. You can.
- the second determination unit 319 may determine whether or not to update the calculated reproducibility by using the result of the re-examination and the determination result of the first determination unit 315. In this case, the calculation unit 307 may update the reproducibility according to the determination result by the second determination unit 319.
- the determination method by the second determination unit 319 may be the same as the above modification.
- test device 200 and the determination devices 300 and 300A of the test system 1 may be realized by a computer that executes the program.
- the computer may perform calculations and logical processing according to a program created in advance, and as an example, it may be a dedicated computer for a special purpose having a microprocessor, a general-purpose computer, or another computer.
- Various embodiments of the present invention may be described with reference to flowcharts and block diagrams, wherein the block is (1) a stage of the process in which the operation is performed or (2) a device responsible for performing the operation. May represent a section of. Specific stages and sections are implemented by dedicated circuits, programmable circuits supplied with computer-readable instructions stored on computer-readable media, and / or processors supplied with computer-readable instructions stored on computer-readable media. You can. Dedicated circuits may include digital and / or analog hardware circuits, and may include integrated circuits (ICs) and / or discrete circuits.
- ICs integrated circuits
- Programmable circuits are memory elements such as logical AND, logical OR, logical XOR, logical NAND, logical NOR, and other logical operations, flip-flops, registers, field programmable gate arrays (FPGA), programmable logic arrays (PLA), etc. May include reconfigurable hardware circuits, including, etc.
- the computer readable medium may include any tangible device capable of storing instructions executed by the appropriate device, so that the computer readable medium having the instructions stored therein is specified in a flowchart or block diagram. It will be equipped with a product that contains instructions that can be executed to create means for performing the operation. Examples of computer-readable media may include electronic storage media, magnetic storage media, optical storage media, electromagnetic storage media, semiconductor storage media, and the like.
- Computer-readable media include floppy® disks, diskettes, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), Electrically erasable programmable read-only memory (EEPROM), static random access memory (SRAM), compact disc read-only memory (CD-ROM), digital versatile disc (DVD), Blu-ray (RTM) disc, memory stick, integrated A circuit card or the like may be included.
- RAM random access memory
- ROM read-only memory
- EPROM or flash memory erasable programmable read-only memory
- EEPROM Electrically erasable programmable read-only memory
- SRAM static random access memory
- CD-ROM compact disc read-only memory
- DVD digital versatile disc
- RTM Blu-ray
- Computer-readable instructions are assembler instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state-setting data, or object-oriented programming such as Smalltalk, JAVA®, C ++, etc. Contains either source code or object code written in any combination of one or more programming languages, including languages and traditional procedural programming languages such as the "C" programming language or similar programming languages. good.
- Computer-readable instructions can be applied locally to the processor or programmable circuit of a programmable data processor such as a general purpose computer, special purpose computer, or other computer, or in a wide area such as a local area network (LAN), the Internet, etc. Computer-readable instructions may be executed to create means for performing the operations specified in the flowchart or block diagram provided over the network (WAN). Examples of processors include computer processors, processing units, microprocessors, digital signal processors, controllers, microcontrollers and the like.
- FIG. 6 shows an example of a computer 2200 in which a plurality of aspects of the present invention may be embodied in whole or in part.
- the program installed on the computer 2200 can cause the computer 2200 to function as an operation associated with the device according to an embodiment of the present invention or as one or more sections of the device, or the operation or the one or more. Sections can be run and / or the computer 2200 can be run a process according to an embodiment of the invention or a stage of such process.
- Such a program may be run by the CPU 2212 to cause the computer 2200 to perform certain operations associated with some or all of the blocks in the flowcharts and block diagrams described herein.
- the computer 2200 includes a CPU 2212, a RAM 2214, a graphic controller 2216, and a display device 2218, which are connected to each other by a host controller 2210.
- the computer 2200 also includes input / output units such as a communication interface 2222, a hard disk drive 2224, a DVD-ROM drive 2226, and an IC card drive, which are connected to the host controller 2210 via the input / output controller 2220.
- input / output units such as a communication interface 2222, a hard disk drive 2224, a DVD-ROM drive 2226, and an IC card drive, which are connected to the host controller 2210 via the input / output controller 2220.
- the computer also includes legacy input / output units such as the ROM 2230 and keyboard 2242, which are connected to the input / output controller 2220 via an input / output chip 2240.
- the CPU 2212 operates according to the programs stored in the ROM 2230 and the RAM 2214, thereby controlling each unit.
- the graphic controller 2216 acquires the image data generated by the CPU 2212 in a frame buffer or the like provided in the RAM 2214 or itself so that the image data is displayed on the display device 2218.
- the communication interface 2222 communicates with other electronic devices via the network.
- the hard disk drive 2224 stores programs and data used by the CPU 2212 in the computer 2200.
- the DVD-ROM drive 2226 reads the program or data from the DVD-ROM 2201 and provides the program or data to the hard disk drive 2224 via the RAM 2214.
- the IC card drive reads programs and data from the IC card and / or writes programs and data to the IC card.
- the ROM 2230 stores a boot program or the like executed by the computer 2200 at the time of activation and / or a program depending on the hardware of the computer 2200.
- the input / output chip 2240 may also connect various input / output units to the input / output controller 2220 via a parallel port, serial port, keyboard port, mouse port, and the like.
- the program is provided by a computer-readable medium such as a DVD-ROM2201 or an IC card.
- the program is read from a computer-readable medium, installed on a hard disk drive 2224, RAM 2214, or ROM 2230, which is also an example of a computer-readable medium, and executed by the CPU 2212.
- the information processing described in these programs is read by the computer 2200 and provides a link between the program and the various types of hardware resources described above.
- the device or method may be configured to perform manipulation or processing of information in accordance with the use of computer 2200.
- the CPU 2212 executes a communication program loaded in the RAM 2214, and performs communication processing on the communication interface 2222 based on the processing described in the communication program. You may order.
- the communication interface 2222 reads and reads transmission data stored in a transmission buffer processing area provided in a recording medium such as a RAM 2214, a hard disk drive 2224, a DVD-ROM 2201, or an IC card. The data is transmitted to the network, or the received data received from the network is written to the reception buffer processing area or the like provided on the recording medium.
- the CPU 2212 causes the RAM 2214 to read all or necessary parts of a file or database stored in an external recording medium such as a hard disk drive 2224, a DVD-ROM drive 2226 (DVD-ROM2201), or an IC card. Various types of processing may be performed on the data on the RAM 2214. The CPU 2212 then writes back the processed data to an external recording medium.
- an external recording medium such as a hard disk drive 2224, a DVD-ROM drive 2226 (DVD-ROM2201), or an IC card.
- Various types of processing may be performed on the data on the RAM 2214.
- the CPU 2212 then writes back the processed data to an external recording medium.
- the CPU 2212 describes various types of operations, information processing, conditional judgment, conditional branching, unconditional branching, and information retrieval described in various parts of the present disclosure with respect to the data read from the RAM 2214. Various types of processing may be performed, including / replacement, etc., and the results are written back to RAM 2214. Further, the CPU 2212 may search for information in a file, a database, or the like in the recording medium. For example, when a plurality of entries each having an attribute value of the first attribute associated with the attribute value of the second attribute are stored in the recording medium, the CPU 2212 specifies the attribute value of the first attribute. Search for an entry that matches the condition from the plurality of entries, read the attribute value of the second attribute stored in the entry, and associate it with the first attribute that satisfies the predetermined condition. The attribute value of the second attribute obtained may be acquired.
- the program or software module described above may be stored on or on a computer-readable medium near the computer 2200.
- a recording medium such as a hard disk or RAM provided in a dedicated communication network or a server system connected to the Internet can be used as a computer readable medium, thereby providing the program to the computer 2200 over the network. do.
- Test system 100 Device to be measured 101 Wafer 200 Test device 201 Tester body 203 Test head 205 Prober 231 Probe needle 300 Judgment device 301 Extraction unit 303 Storage unit 305 Result acquisition unit 307 Calculation unit 309 Lower limit value acquisition unit 311 Prediction unit 313 Threshold determination Part 315 1st judgment part 317 3rd judgment part 319 2nd judgment part 321 Learning processing part 371 Learning model 373 Supply part 375 Reproducibility acquisition part 2200 Computer 2201 DVD-ROM 2210 Host controller 2212 CPU 2214 RAM 2216 Graphic controller 2218 Display device 2220 Input / output controller 2222 Communication interface 2224 Hard disk drive 2226 DVD-ROM drive 2230 ROM 2240 Input / Output Chip 2242 Keyboard
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Abstract
Description
図1は、本実施形態に係る試験システム1を示す。試験システム1は、被測定デバイス100と、試験装置200と、判定装置300とを備える。試験装置200と判定装置300とは、単一の装置として一体的に形成されてもよい。
被測定デバイス100は、例えば、半導体やMicro Electro Mechanical Systems(MEMS)等の電子デバイスであってよい。被測定デバイス100は、1つのウエハ上に複数形成されていてもよいし、ウエハをダイシングして個片化されてベアチップ状になっていてもよいし、封止されてパッケージングされていてもよい。
試験装置200は、1または複数の被測定デバイス100に対して試験を行う。試験装置200は、単一の項目の試験を行ってもよいし、複数の項目(一例として1000~2000項目)の試験を並行して、或いは順に行ってもよい。試験に含まれる複数の項目のうち何れか2以上の項目は、例えば被測定デバイス100がパッケージングされた電子デバイスである場合には、オーディオ機能などの同一のカテゴリに属する試験項目であってよい。本実施形態では一例として、試験装置200は、ウエハ上の複数の被測定デバイス100に対して複数の項目の試験を順に行う。
判定装置300は、抽出部301と、記憶部303と、結果取得部305と、算出部307と、下限値取得部309と、予測部311と、閾値決定部313と、第1判定部315とを有する。
抽出部301は、試験装置200から試験のデータファイル(本実施形態では一例としてSTDFファイル)を取得し、当該データファイルから各項目の試験結果(本実施形態では一例としてパス/フェイルの判定値)を抽出する。抽出部301は、データファイルから試験結果のほか、対応する試験の項目ID、および、被測定デバイス100のデバイスIDやロット番号などを予め抽出してCSV(comma-separated values)ファイルに変換してよい。抽出部301は、抽出したデータを記憶部303に供給してよい。
記憶部303は、抽出部301により抽出された試験結果(本実施形態では一例としてパス/フェイルの判定値)を記憶する。記憶部303は、試験の項目ID、被測定デバイス100のデバイスIDおよびロット番号などを試験結果に対応付けてさらに記憶してよい。記憶部303に記憶されたデータは、結果取得部305によって読み出し可能であってよい。
結果取得部305は、被測定デバイス100に対して行われる複数の項目の試験結果を取得する。本実施形態では一例として、結果取得部305は、記憶部303から試験結果を取得してよい。結果取得部305は、各項目の試験結果とともに当該項目の項目IDおよび被測定デバイス100のデバイスIDを記憶部303から取得してよい。結果取得部305は、初検についての試験結果などを算出部307および第1判定部315に供給してよい。
算出部307は、予め複数の被測定デバイス100に試験を複数回(本実施形態では一例として2回)行った場合での試験結果の再現性を算出する。算出部307は、算出した再現性の値を第1判定部315および予測部311に供給してよい。
学習モデル371は、複数の項目の試験結果を入力したことに応じて、再験の予測結果を出力する。
供給部373は、学習モデル371に対し、結果取得部305により取得された複数の項目の試験結果(本実施形態では一例として初検の試験結果)を供給する。供給部373は、各項目の試験結果とともに当該項目の項目IDを供給してよい。
再現性取得部375は、供給部373が複数の項目の試験結果を学習モデル371に供給したことに応じて学習モデル371が出力する再検の予測結果から再現性を取得する。再現性取得部375は、再検の予測結果の値に四則演算などを行って再現性を取得してもよいし、予測結果の値そのものを再現性として取得してもよい。
下限値取得部309は、試験をパスする被測定デバイス100の割合の許容下限値を取得する。許容下限値は、試験をパスするべき被測定デバイス100の歩留まり等に基づいて、判定装置300のオペレータにより設定されてよい。許容下限値は、一例として10%であってよい。下限値取得部309は、取得した許容下限値を閾値決定部313に供給してよい。
予測部311は、各項目の再現性に基づいて、対応する項目の試験(本実施形態では一例として初検)にフェイルした被測定デバイス100のうち、少なくとも当該項目の再検をパスすると予測される被測定デバイス100の予測パス個数を算出する。例えば、予測部311は、再検の全体をパスすると予測される被測定デバイス100の予測パス個数を算出してよい。
閾値決定部313は、各項目の再現性および予測パス個数から、再検を行うか否かを判定するための閾値を決定する。本実施形態では一例として閾値は再現性の値であってよい。閾値決定部313は、決定した閾値を第1判定部315に供給してよい。
第1判定部315は、試験(本実施形態では一例として初検)をフェイルした被測定デバイス100に再検を行うか否かを判定する。試験をフェイルしたとは、試験に含まれる少なくとも1つの項目をフェイルしたことであってよい。第1判定部315は、再現性に基づいて判定を行ってよい。
図2は、試験装置200をウエハ101とともに示す。試験装置200は、テスタ本体201、テストヘッド203、および、プローバ205を備える。
図3は、判定装置300の動作を試験装置200の動作とともに示す。判定装置300は、ステップS11~S25の処理を行うことにより、被測定デバイス100の再検の要否を判定する。なお、図中の破線枠は試験装置200による処理を示す。
図4は、第1判定処理を示す。判定装置300は、ステップS101~S107の処理を行うことにより、被測定デバイス100に対して再検を行うか否かを判定する。
予測パス個数=初検フェイル数-再検予測フェイル数 (2)
図5は、変形例に係る判定装置300Aを試験装置200や被測定デバイス100とともに示す。判定装置300Aは、第1判定部315Aと、結果取得部305Aと、第3判定部317と、第2判定部319と、学習処理部321とをさらに有する。なお、本変形例に係る判定装置300Aにおいて、図1に示された判定装置300と略同一のものには同一の符号を付け、説明を省略する。
第1判定部315Aは、上記の第1判定部315と同様の構成であるが、判定結果を第2判定部319にも供給するようになっている。
結果取得部305Aは、上記の結果取得部305と同様の構成であるが、試験結果などとともに被測定デバイス100のロット番号を記憶部303からさらに取得する。また、結果取得部305Aは、ロット番号と、デバイスIDとを対応付けて第3判定部317に供給する。また、結果取得部305Aは、第3判定部317から供給されるデバイスIDに対応する初検の試験結果、および、再検の試験結果を、試験項目の項目IDと対応付けて記憶部303から取得し、第2判定部319に供給する。
第3判定部317は、被測定デバイス100に再検を行うか否かの判定を行う。第3判定部317は、第1判定部315の判定結果によらず再検を行う旨の判定を行ってよい。第3判定部317は、基準数(本実施形態では一例として4)個おきのロットに含まれる被測定デバイス100に対して試験が行われることに応じて再検を行う旨の判定を行ってよい。例えば、第3判定部317は、基準数個のロットの次のロット(本実施形態では一例として5番目のロット)に含まれる各被測定デバイス100に対して初検が行われる場合に、当該被測定デバイス100に対して再検を行う旨の判定を行ってよい。一例として、第3判定部317は、上述のステップS15と、ステップS17との間で判定を行ってよい。
第2判定部319は、再検の結果と、第1判定部315の判定結果とを用いて、学習モデル371を再学習するか否かを判定する。第2判定部319により用いられる再検の結果とは、第3判定部317により行われる再検の結果であってよいが、第1判定部315により行われる再検の結果であってもよい。
学習処理部321は、試験の各項目のうち少なくともフェイルした項目の項目IDと、再験の結果とを含む学習データを用いて学習モデル371の学習処理を実行する。学習処理部321は、第2判定部319による判定結果に応じて学習モデル371の学習処理を実行してよい。一例として、学習処理部321は、第2判定部319から学習データが供給されることに応じて学習処理を行ってよい。学習処理部321は、ウエハ上での被測定デバイス100の位置や、測定値と理想値とのずれ量などを更に含む学習データをさらに用いて学習処理を実行してもよい。学習処理部321は、これらのデータを結果取得部305Aや第2判定部319から取得してよい。
なお、上記の実施形態および変形例においては、判定装置300は、算出部307と、下限値取得部309と、予測部311と、閾値決定部313とを有することとして説明したが、これらを有しないこととしてもよい。例えば、判定装置300は、外部接続された算出部307や予測部311、閾値決定部313から、再現性や予測パス個数、閾値の算出結果を取得してもよい。また、判定装置300は、予測パス個数や閾値を用いずに第1判定部315による判定を行ってもよい。一例として、第1判定部315は、再現性が大きい基準数の項目にフェイルした被測定デバイスに再検を行わない旨の判定を行ってもよい。
100 被測定デバイス
101 ウエハ
200 試験装置
201 テスタ本体
203 テストヘッド
205 プローバ
231 プローブニードル
300 判定装置
301 抽出部
303 記憶部
305 結果取得部
307 算出部
309 下限値取得部
311 予測部
313 閾値決定部
315 第1判定部
317 第3判定部
319 第2判定部
321 学習処理部
371 学習モデル
373 供給部
375 再現性取得部
2200 コンピュータ
2201 DVD-ROM
2210 ホストコントローラ
2212 CPU
2214 RAM
2216 グラフィックコントローラ
2218 ディスプレイデバイス
2220 入/出力コントローラ
2222 通信インターフェイス
2224 ハードディスクドライブ
2226 DVD-ROMドライブ
2230 ROM
2240 入/出力チップ
2242 キーボード
Claims (14)
- 被測定デバイスに対して行われる複数の項目の試験の試験結果を取得する結果取得部と、
前記試験をフェイルした被測定デバイスに再試験を行うか否かを判定する第1判定部と、
を備え、
前記第1判定部は、予め複数の被測定デバイスに前記試験を複数回行った場合での試験結果の再現性に基づいて判定を行う、判定装置。 - 前記複数の項目のそれぞれについて前記再現性を算出する算出部をさらに備え、
前記第1判定部は、前記算出部により算出される前記再現性に基づいて、対応する項目の試験をフェイルした被測定デバイスに再試験を行うか否かを判定する、請求項1に記載の判定装置。 - 前記第1判定部は、前記再現性を学習した学習モデルを用いて判定を行う、請求項2に記載の判定装置。
- 前記算出部は、
前記複数の項目の試験結果を入力したことに応じて、再試験の予測結果を出力する学習モデルと、
前記学習モデルに対し、前記結果取得部により取得された前記複数の項目の試験結果を供給する供給部と、
前記複数の項目の試験結果を前記学習モデルに供給したことに応じて前記学習モデルが出力する再試験の予測結果から前記再現性を取得する再現性取得部と、
を有する、請求項3に記載の判定装置。 - 前記複数の項目のうち少なくともフェイルした項目の項目IDと、再試験の結果とを含む学習データを用いて前記学習モデルの学習処理を実行する学習処理部をさらに備える、請求項4に記載の判定装置。
- 再試験の結果と、前記第1判定部の判定結果とを用いて、前記学習モデルを再学習するか否かを判定する第2判定部をさらに備え、
前記学習処理部は、前記第2判定部による判定結果に応じて前記学習モデルの学習処理を実行する、請求項5に記載の判定装置。 - 前記算出部は、複数の被測定デバイスに対する複数の前記試験の試験結果と、複数の再試験の試験結果とから、前記再現性を算出する、請求項2に記載の判定装置。
- 再試験の結果と、前記第1判定部の判定結果とを用いて、前記再現性を更新するか否かを判定する第2判定部をさらに備え、
前記算出部は、前記第2判定部による判定結果に応じて、前記再現性を更新する、請求項7に記載の判定装置。 - 基準数個おきのロットに含まれる被測定デバイスに対して前記試験が行われることに応じて前記第1判定部の判定結果によらず被測定デバイスに再試験を行う旨の判定を行う第3判定部をさらに備え、
前記第2判定部は、前記第3判定部により行われる再試験の結果を用いて判定を行う、請求項6または8に記載の判定装置。 - 前記試験をパスする被測定デバイスの割合の許容下限値を取得する下限値取得部と、
各項目の前記再現性に基づいて、対応する項目の試験にフェイルした被測定デバイスのうち、少なくとも当該項目の再試験をパスすると予測される被測定デバイスの予測パス個数を算出する予測部をさらに備え、
前記第1判定部は、各項目の前記再現性の大きさに従って、対応する前記予測パス個数を順に積算する場合に、前記許容下限値の対応個数に達するとき、または、達する直前の前記予測パス個数に対応する前記再現性に基づく値を判定の閾値として用いる、請求項2から9の何れか一項に記載の判定装置。 - 試験結果を含むデータファイルを取得し、当該データファイルから各項目の試験結果を抽出する抽出部と、
前記抽出部により抽出された試験結果を記憶する記憶部と、
をさらに備え、
前記結果取得部は、前記記憶部から前記複数の項目の試験結果を取得する、請求項1から10の何れか一項に記載の判定装置。 - 請求項1から11の何れか一項に記載の判定装置と、
被測定デバイスに対して複数の項目の試験を行う試験装置と、
を備える試験システム。 - 被測定デバイスに対して行われる複数の項目の試験の試験結果を取得する結果取得段階と、
前記試験をフェイルした被測定デバイスに再試験を行うか否かを判定する第1判定段階と、
を備え、
前記第1判定段階では、予め複数の被測定デバイスに前記試験を複数回行った場合での試験結果の再現性に基づいて判定を行う、判定方法。 - コンピュータにより実行されて、前記コンピュータを、
被測定デバイスに対して行われる複数の項目の試験の試験結果を取得する結果取得部と、
前記試験をフェイルした被測定デバイスに再試験を行うか否かを判定する第1判定部と、
して機能させ、
前記第1判定部は、予め複数の被測定デバイスに前記試験を複数回行った場合での試験結果の再現性に基づいて判定を行う、判定プログラム。
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