WO2011027392A1 - 試験装置、試験方法およびプログラム - Google Patents
試験装置、試験方法およびプログラム Download PDFInfo
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- WO2011027392A1 WO2011027392A1 PCT/JP2009/004333 JP2009004333W WO2011027392A1 WO 2011027392 A1 WO2011027392 A1 WO 2011027392A1 JP 2009004333 W JP2009004333 W JP 2009004333W WO 2011027392 A1 WO2011027392 A1 WO 2011027392A1
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- Prior art keywords
- test
- probe card
- terminals
- device under
- under test
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- 238000012360 testing method Methods 0.000 title claims abstract description 363
- 239000000523 sample Substances 0.000 claims abstract description 223
- 238000006073 displacement reaction Methods 0.000 claims abstract description 102
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Classifications
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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]
- G01R31/2886—Features relating to contacting the IC under test, e.g. probe heads; chucks
- G01R31/2891—Features relating to contacting the IC under test, e.g. probe heads; chucks related to sensing or controlling of force, position, temperature
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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
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
- G01R31/2831—Testing of materials or semi-finished products, e.g. semiconductor wafers or substrates
-
- 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]
- G01R31/2886—Features relating to contacting the IC under test, e.g. probe heads; chucks
- G01R31/2887—Features relating to contacting the IC under test, e.g. probe heads; chucks involving moving the probe head or the IC under test; docking stations
-
- 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]
- G01R31/2893—Handling, conveying or loading, e.g. belts, boats, vacuum fingers
Definitions
- the present invention relates to a test apparatus, a test method, and a program.
- a probe card having a large number of bumps corresponding to the test pads of the semiconductor chip is used. Since the test pads and bumps are very small, for the purpose of accurately aligning the corresponding test pads and bumps, alignment marks are attached to both the semiconductor wafer and the probe card, and the alignment marks are used to Positioning the probe card is performed.
- the test pad and the test pad may be deformed due to a manufacturing error of the semiconductor wafer, the probe card or the alignment mark, or a deformation of the semiconductor wafer or the probe card caused by a temperature change. There may be a displacement between the bumps.
- the positional information of the plurality of first terminals provided on the surface of the device under test and the surface of the probe card used for testing the device under test are provided. Based on the position information acquisition unit for acquiring the position information of the plurality of second terminals, the position information of the plurality of first terminals acquired by the position information acquisition unit, and the position information of the plurality of second terminals. The amount of displacement between each of the terminals and the corresponding plurality of second terminals is calculated, and the relative position between the device under test and the probe card is determined so that the maximum value of the amount of displacement is smaller than a predetermined value.
- the test apparatus may further include a plurality of probe cards and a plurality of test heads corresponding to each of the plurality of probe cards and testing the device under test.
- Each of the plurality of probe cards includes a plurality of test heads. May be electrically connected to the device under test.
- the positional information of the plurality of first terminals provided on the surface of the device under test and the plurality of probes provided on the surface of the probe card used for testing the device under test A plurality of first terminals based on the position information acquisition unit for acquiring the position information of the second terminals and the position information of the plurality of first terminals and the position information of the plurality of second terminals acquired by the position information acquisition unit.
- a first storage unit that stores the displacement amount at the relative position determined by the control unit in association with each of the plurality of second terminals, and the device under test.
- the relative position with respect to the probe card is adjusted so that the device under test and the probe card are electrically connected, the test head for testing the device under test electrically connected to the probe card, and the test result
- the second storage unit that stores the plurality of second terminals in association with each other, and the displacement amount at the defective portion is smaller than a predetermined value
- An analysis unit that determines that there is a problem with the device under test or the probe card and determines that there is a problem with the connection state between the device under test and the probe card when the displacement at the defective portion is greater than a predetermined value;
- a test device is provided.
- the position information acquisition unit may be an imaging unit that images at least one of the surface of the device under test and the surface of the probe card.
- the positional information of the plurality of first terminals provided on the surface of the device under test and the plurality of second terminals provided on the surface of the probe card used for testing the device under test The step of acquiring the position information and the displacement between each of the plurality of first terminals and each of the corresponding plurality of second terminals based on the position information of the plurality of first terminals and the position information of the plurality of second terminals.
- a test method is provided that includes calculating the quantity and aligning the device under test and the probe card to make the maximum value of the displacement smaller than a predetermined value.
- the device under test and the probe card may be aligned so as to minimize the maximum displacement.
- the alignment step includes a step of calculating a maximum displacement amount for a plurality of cases where the relative positions of the device under test and the probe card are changed, and a displacement amount calculated for the plurality of cases. Determining a relative position between the device under test and the probe card based on the maximum value of.
- the step of acquiring the position information may include a step of preparing a plurality of probe cards, and a step of acquiring the position information of the plurality of second terminals for each of the plurality of probe cards.
- the alignment step involves determining the relative position between the device under test and each of the plurality of probe cards, and selecting one of the plurality of probe cards based on the maximum amount of displacement at the determined relative position. And positioning the device under test and the probe card selected in the step of selecting one of the plurality of probe cards based on the relative position determined in the step of determining the relative position. May be combined.
- the test method is based on the positional information of the plurality of first terminals and the positional information of the plurality of second terminals, and each of the plurality of second terminals is displaced from the corresponding first terminal in the aligned state. Calculating a quantity; storing a displacement amount in an aligned state for each of the plurality of second terminals; testing a device under test; and a result of the test for the plurality of second terminals.
- An example of the front view of the test apparatus 100 is shown.
- An example of the partial longitudinal cross-sectional view of the test apparatus 100 is shown.
- An example of a partial horizontal sectional view of the test apparatus 100 is shown.
- An example of the partial longitudinal cross-sectional view of the alignment unit 400 is shown.
- An example of a cross-sectional view of the test head 200 is shown.
- An example of the exploded view of the probe card 300 is shown.
- An example of the partial expanded sectional view of the membrane unit 370 is shown.
- An example of the top view of the wafer 810 and the probe card 820 is shown. 2 shows an example of a system configuration of a control system 500.
- An example of the flowchart of the test method of the test apparatus 100 is shown.
- the flowchart of the determination method of the relative position in S1020 is shown.
- the other example of the flowchart of the test method of the test apparatus 100 is shown.
- test apparatus 101 wafer, 110 EFEM (Equipment Front End Module), 112 signal lamp, 114 EMO (EMmergency Off), 115 rail, 116 robot arm, 117 column, 118 pre-aligner, 120 operation unit, 122 display, 124 arm, 126 input device, 130 load unit, 132 load table, 134 load gate, 140 chiller unit, 150 FOUP (Front Opening Unified Pod), 160 mainframe, 200 test head, 201 housing, 202 contactor, 210 pin electronics, 220 motherboard 222 angle connector, 224 relay connector 226, angle connector, 228 small board, 230 flat cable, 240 support board, 250 three-dimensional actuator, 260 contactor board, 270 sub-board, 280 contactor housing, 300 probe card, 312 upper frame, 314 lower frame, 316 screw, 320 wiring board, 323 contact pad, 330 guide unit, 340 PCR sheet (Pressure sensitive Conductor Sheet), 341 through electrode, 344 through hole, 350 interposer, 351 contact pad, 353 contact pad, 3
- FIG. 1 schematically shows an example of a front view of the test apparatus 100.
- the test apparatus 100 includes an EFEM 110, an operation unit 120, a load unit 130, and a chiller unit 140.
- the test apparatus 100 tests the electrical characteristics of a device such as a semiconductor chip formed on a semiconductor wafer, for example, and determines whether the device under test is good or bad.
- the test apparatus 100 may collectively test a plurality of semiconductor chips formed on the semiconductor wafer.
- the semiconductor wafer and the semiconductor chip may be an example of a device under test.
- the EFEM 110 incorporates a mechanism for transporting a substrate such as a semiconductor wafer to be tested inside the test apparatus 100.
- the EFEM 110 may be an example of a transport unit that transports a device under test.
- the signal lamp 112 indicating the operation state of the test apparatus 100 and the test apparatus 100 are operated in an emergency stop at a high position on the front surface of the EFEM 110.
- EMO114 is arranged.
- the operation unit 120 includes a display 122, an arm 124, and an input device 126.
- the operation unit 120 is supported by the EFEM 110.
- One end of the arm 124 is coupled to the EFEM 110 and the other end of the arm 124 supports the display 122 and the input device 126 movably.
- the display 122 includes, for example, a liquid crystal display device and a touch panel display, and displays an operation state of the test apparatus 100, an echo back of input content from the input device 126, and the like.
- the input device 126 includes, for example, a keyboard, a mouse, a trackball, a jog tire, a touch panel display, a storage medium reading device, and the like, and receives instructions or information related to setting, operation, and the like of the test device 100. These instructions and the like may be input to the test apparatus 100 from another computer via a communication line.
- the load unit 130 includes a load table 132 and a load gate 134.
- a load table 132 On the load table 132, a container that contains a semiconductor wafer to be tested is placed.
- the load gate 134 opens and closes when the semiconductor wafer is loaded into or unloaded from the test apparatus 100. Thereby, the semiconductor wafer can be loaded from the outside without reducing the cleanliness inside the test apparatus 100.
- the chiller unit 140 may cool the wafer whose temperature has been raised by the test in the test apparatus 100 before unloading.
- the EFEM 110 can be used for loading and unloading the semiconductor wafer into and from the chiller unit 140.
- the chiller unit 140 may adjust the temperature of the cooling water and supply the cooling water to an air conditioning facility that controls the temperature inside the test apparatus 100.
- the chiller unit 140 may be disposed adjacent to the EFEM 110, and may be disposed between the load unit 130 and a test head that performs a test.
- FIG. 2 schematically shows an example of a partial longitudinal sectional view of the test apparatus 100. Elements that are the same as those in FIG. 1 are given the same reference numerals, and redundant descriptions are omitted.
- the test apparatus 100 includes a load unit 130, an EFEM 110, a main frame 160, an alignment unit 400, a probe card 300, and a test head 200.
- illustration of the chiller unit 140 is abbreviate
- the load unit 130, the EFEM 110, and the main frame 160 are sequentially arranged adjacently from the front surface (left side in the figure) to the rear side (right side in the figure).
- the alignment unit 400, the probe card 300, and the test head 200 are stacked on the main frame 160.
- the load unit 130 and the EFEM 110, and the alignment unit 400 and the EFEM 110 are communicated with each other in an airtight manner, and the inside thereof is kept highly clean.
- the FOUP 150 is placed on the load table 132 of the load unit 130.
- the FOUP 150 stores a plurality of wafers 101 to be tested. Further, when the wafer 101 after the test is collected, the wafer is stored in the FOUP 150.
- EFEM 110 has a built-in robot arm 116.
- the robot arm 116 is mounted on a column 117 that travels along the rail 115, and conveys the wafer between the load unit 130 and the alignment unit 400.
- the robot arm 116 takes out the wafers 101 one by one from the FOUP 150 through the load gate 134 and conveys them to the alignment unit 400.
- the main frame 160 controls the operation of each part of the test apparatus 100.
- the main frame 160 includes a control system 500 that controls operations of the test head 200 and the alignment unit 400.
- the control system 500 may reflect the input received by the input device 126 of the operation unit 120 to each unit of the test apparatus 100. Further, the control system 500 may generate display contents reflecting the operation state of the test apparatus 100 and display the display contents on the display 122.
- the control system 500 may be an example of a control unit.
- the control system 500 may control the operation of the test head 200 according to the test program.
- the control system 500 may synchronize the operations of the load unit 130, the EFEM 110, and the alignment unit 400 to transfer the wafer 101 to each other.
- the control system 500 may immediately stop the operation of each part of the test apparatus 100 when the EMO 114 is operated.
- the control system 500 may be connected to another test apparatus, a probe card 300 manufacturing apparatus, and a device under test manufacturing apparatus via a communication line. As a result, the control system 500 can obtain the test result of the device under test in another test apparatus or information related to the design or manufacture of the probe card or the device under test via the communication line. Note that the control system 500 may obtain such information from the operation unit 120.
- the test head 200 is electrically connected to the wafer 101 and tests the electrical characteristics of the wafer 101.
- the test head 200 may perform a burn-in inspection of the wafer 101.
- the test head 200 stores a plurality of pin electronics 210.
- the pin electronics 210 has an electric circuit required according to the test target and the content of the test.
- the test head 200 is electrically connected to the probe card 300 via the contactor 202 attached to the lower surface.
- the probe card 300 is used for testing a device under test.
- the probe card 300 may be a wiring board unit that is interposed between the test head 200 and the wafer 101 and electrically connects the test head 200 and the wafer 101 when a test is performed in the test apparatus 100. .
- an electrical signal path is formed between the test head 200 and the wafer 101 by the probe card 300.
- the test apparatus 100 can correspond to the wafer 101 having a different layout.
- the alignment unit 400 adjusts the relative position between the wafer 101 and the probe card 300 based on a signal from the control system 500, and electrically connects the wafer 101 and the probe card 300.
- the alignment unit 400 may electrically connect the probe card 300 selected by the control system 500 and the wafer 101 based on a signal from the control system 500.
- the alignment unit 400 may be an example of an alignment unit.
- the alignment unit 400 includes an alignment stage 410.
- the alignment stage 410 travels along the rail 402 with the wafer tray 450 and the wafer 101 mounted thereon.
- the alignment stage 410 adjusts the relative position between the wafer 101 and the probe card 300 to align the probe card 300 and the wafer 101.
- the alignment stage 410 can expand and contract in the vertical direction to raise or lower the mounted wafer 101.
- the alignment stage 410 presses the wafer 101 against the probe card 300 by moving the wafer 101 toward the probe card 300.
- the terminal provided on the surface of the wafer 101 and the terminal provided on the surface of the probe card 300 and corresponding to the terminal come into contact with each other.
- “corresponding terminal” refers to a terminal that is electrically connected when a test of a device under test is performed.
- the test pads on the wafer 101 and the bumps on the probe card 300 may be an example of the terminals.
- the alignment stage 410 expands and contracts in the vertical direction and the wafer 101 is pressed against the probe card 300 to electrically connect the two has been described.
- the method of electrically connecting both is not limited to this.
- the alignment stage 410 holding the wafer 101 may expand and contract in the horizontal direction, and the wafer 101 may be pressed against the probe card 300 held vertically to electrically connect both.
- FIG. 3 schematically shows an example of a partial horizontal sectional view of the test apparatus 100. Elements common to those in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description is omitted.
- the test apparatus 100 includes four load units 130 and four test heads 200. Each load unit 130 is loaded with a FOUP 150. One EFEM 110 and one alignment unit 400 are arranged. The alignment unit 400 includes a single alignment stage 410.
- the test apparatus 100 includes a plurality of probe cards 300 corresponding to the plurality of test heads 200, respectively.
- the column 117 that supports the robot arm 116 moves along the rail 115 over substantially the entire width of the EFEM 110. Therefore, the robot arm 116 can transfer the wafer 101 to all of the four load units 130 and the four test heads.
- a pre-aligner 118 is disposed at the end opposite to the chiller unit 140.
- the pre-aligner 118 adjusts the mounting position of the wafer 101 with respect to the robot arm 116 with a considerably higher accuracy than the accuracy required by the test head 200. Thereby, the initial position accuracy when the robot arm 116 mounts the wafer 101 on the wafer tray 450 is improved, and the time required for alignment with the probe card 300 is shortened. In addition, the throughput of the test apparatus 100 can be improved.
- the alignment unit 400 includes a rail 402, an alignment stage 410, a rail 422, a stage carrier 420, and a microscope 430.
- the rail 402 is disposed over substantially the entire width of the bottom surface of the housing 401.
- the stage carrier 420 moves in the longitudinal direction of the casing 401 along the rail 402.
- the stage carrier 420 has a rail 422 perpendicular to the rail 402 on the upper surface.
- the stage carrier 420 carries a part of the alignment stage 410 and the microscope 430.
- the alignment stage 410 and a part of the microscope 430 move on the rail 422 in the lateral direction of the housing 401.
- a pair of microscopes 430 are mounted on the stage carrier 420.
- the pair of microscopes 430 are spaced apart in the extending direction of the rail 402. Thereby, the movement amount of the stage carrier 420 when imaging the wafer 101 or the probe card 300 can be suppressed.
- the pair of microscopes 430 are arranged upward.
- the pair of microscopes 430 captures an image of the probe card 300 and acquires information regarding the positions and shapes of the bumps provided on the surface of the probe card 300.
- the other part of the microscope 430 is disposed on the ceiling surface of the casing 401. These microscopes 430 are arranged downward. These microscopes 430 are arranged in the immediate vicinity of the corresponding probe card 300 corresponding to each of the test heads 200. These microscopes 430 capture an image of the wafer 101 placed on the alignment stage 410 and acquire information on the position and shape of the test pad provided on the surface of the wafer 101. When the test of the device formed on the wafer 101 is executed, the test pad makes an electrical contact used for input / output of a signal to the device, power supply, and the like.
- the test pad may be an example of a first terminal.
- the probe card 300 and the wafer 101 can be aligned with higher accuracy than the accuracy of the pre-aligner 118.
- the position of the wafer 101 can be detected by analyzing image data captured by the microscope 430 and detecting an edge of the wafer 101 or an alignment mark provided on the wafer 101.
- the relative position between the microscope 430 arranged on the ceiling surface of the housing 401 and the probe card 300 is known.
- the difference between the detected position of the wafer 101 and the position of the probe card 300 is calculated, and the alignment stage 410 is moved so that the difference is compensated, whereby the wafer 101 and the probe card 300 are positioned.
- the alignment between the wafer 101 and the probe card 300 is not limited to this.
- the image of the microscope 430 may be displayed on the display 122 and the wafer 101 and the probe card 300 may be manually aligned.
- the contact between the plurality of terminals provided on the surface of the wafer 101 and the plurality of terminals provided on the surface of the probe card 300 is performed.
- the wafer 101 and the probe card 300 are aligned so that the state becomes better. Thereby, the plurality of terminals provided on the surface of the wafer 101 and the plurality of terminals provided on the surface of the probe card 300 can be brought into more stable contact.
- the microscope 430 may be an example of an imaging unit that images at least one of the surface of the wafer 101 and the surface of the probe card 300.
- the microscope 430 is an example of a position information acquisition unit that acquires position information of a plurality of terminals provided on the surface of the wafer 101 and position information of a plurality of terminals provided on the surface of the probe card 300. It's okay.
- position information of a plurality of terminals provided on the surface of the wafer 101 represents the relative position and shape of each terminal on the wafer 101.
- position information of the plurality of terminals provided on the surface of the probe card 300 represents the relative position and shape of each terminal in the probe card 300.
- the position information of all terminals is acquired by imaging the wafer 101 or the probe card 300, but the function of the position information acquisition unit is not limited to this.
- position information may be acquired only for terminals that are functionally important among terminals provided on the surface of the device under test or the probe card, or terminals that are important for improving the accuracy of alignment.
- functionally important terminals include terminals that supply power and terminals that handle signals with high frequencies.
- Examples of the terminal that is important for improving the alignment accuracy include a terminal that forms a contour of the shape when a plurality of terminals are gathered to form a certain shape.
- FIG. 4 schematically shows an example of a partial longitudinal sectional view of the alignment unit 400. Elements common to FIGS. 1 to 3 are denoted by the same reference numerals and redundant description is omitted, and the main frame 160 is not shown in FIG. 4.
- the alignment unit 400 includes a housing 401, an alignment stage 410, and a hanger hook 440.
- the housing 401 has a width corresponding to a plurality of test heads 200, for example, four test heads 200.
- four probe cards 300 are mounted on the upper surface of the housing 401 corresponding to each of the test heads 200.
- hanger hooks 440 that are opened and closed are arranged at positions corresponding to the test heads 200, respectively.
- the hanger hook 440 suspends the wafer tray 450 and holds the wafer tray 450 directly below the probe card 300.
- alignment unit 400 stands by wafer tray 450 immediately below each of test head 200 and probe card 300.
- the wafer tray 450 held by the hanger hook 440 is once mounted on the alignment stage 410 rising from below.
- the wafer tray 450 can be released from the hanger hook 440 by lowering the alignment stage 410 with the hanger hook 440 opened.
- the robot arm 116 of the EFEM 110 mounts the wafer 101 on the wafer tray 450 whose upper surface is opened by the lowering of the alignment stage 410.
- the alignment stage 410 can mount the wafer 101 in a state of being placed on the wafer tray 450.
- the alignment stage 410 raises the wafer tray 450 and presses it against the lower surface of the probe card 300 while aligning the wafer 101 with respect to the probe card 300. In this state, the probe card 300, the wafer 101, and the wafer tray 450 are integrated.
- the probe card 300, the wafer 101, and the wafer tray 450 can be integrated by lowering the pressure between the probe card 300 and the wafer tray 450 while the wafer 101 is sandwiched between the probe card 300 and the wafer tray 450.
- a fixing jig that sandwiches the probe card 300 sandwiching the wafer 101 and the wafer tray 450 from the outside may be used.
- the alignment stage 410 moves leaving the wafer 101 and the wafer tray 450. Since the probe card 300, the wafer 101, and the wafer tray 450 are integrated, the wafer 101 and the wafer tray 450 do not fall without the alignment stage 410.
- the wafer 101 can be loaded into the test head 200. Further, while the test head 200 is testing the wafer 101, the alignment stage 410 can carry the other wafer 101 to the other test head 200. When the wafer 101 that has been tested is collected, the above series of operations may be executed in the reverse order. Thereby, the wafer 101 can be carried out by the robot arm 116. At this time, the wafer tray 450 stands by just below the test head 200.
- the wafer tray 450 and the wafer 101 are integrated with the probe card 300 immediately below the test head 200.
- the hanger hook 440 is closed but is not in contact with the wafer tray 450.
- the alignment stage 410 pushes up the mounted wafer tray 450 and the wafer 101 immediately below the test head 200 and closely contacts the lower surface of the probe card 300.
- a hanger hook 440 holds the wafer tray 450 and stands by.
- the alignment unit 400 is equipped with the wafer tray 450 corresponding to each of the four test heads 200. Thereby, each of the test heads 200 can test the wafer 101 individually.
- the plurality of test heads 200 may perform the same type of test, or may perform different types of tests. In the latter case, the throughput of the test apparatus 100 can be improved by causing a plurality of test heads to perform a time-consuming test.
- the single alignment stage 410 and the robot arm 116 are shared among the plurality of test heads 200. As a result, it is possible to improve the utilization efficiency of the alignment stage 410 and the robot arm 116 that are not required during the test execution period.
- FIG. 5 schematically shows an example of a cross-sectional view of the test head 200. Elements common to FIGS. 1 to 4 are denoted by the same reference numerals, and redundant description is omitted.
- the test head 200 includes a housing 201, a contactor 202, pin electronics 210, a motherboard 220, and a flat cable 230.
- a mother board 220 having a plurality of relay connectors 224 is horizontally arranged inside the housing 201.
- the relay connector 224 has a receptacle on each of the upper surface side and the lower surface side of the mother board 220 to form a signal path that penetrates the mother board 220.
- pin electronics 210 are attached to each of the relay connectors 224 via angle connectors 222. With such a structure, the pin electronics 210 can be exchanged according to the specification of the test object and the test content.
- the plurality of pin electronics 210 may have the same specifications or different specifications. Further, the pin electronics 210 may not be attached to some relay connectors 224.
- a small board 228 is connected to each relay connector 224 via an angle connector 226 on the lower surface of the motherboard 220.
- One end of a flat cable 230 is connected to the small board 228.
- a contactor 202 is attached to the lower surface of the housing 201.
- the contactor 202 includes a support substrate 240, a three-dimensional actuator 250, a contactor substrate 260, a sub substrate 270, and a contactor housing 280.
- the support substrate 240 has an upper surface fixed to the casing 201 and supports the upper end of the three-dimensional actuator 250 on the lower surface.
- the lower end of the three-dimensional actuator 250 supports the contactor substrate 260.
- the sub-board 270 and the contactor housing 280 are fixed to the lower surface of the contactor board 260.
- the three-dimensional actuator 250 can move in the horizontal direction along the lower surface of the support substrate 240 and also expands and contracts in the vertical direction. Thereby, the contactor substrate 260 can be moved three-dimensionally. When the contactor substrate 260 moves, the sub substrate 270 and the contactor housing 280 also move together with the contactor substrate 260.
- the lower end of the flat cable 230 is coupled to a terminal, for example, a spring pin, held by the contactor housing 280.
- the pin electronics 210 is electrically connected to the lowermost surface of the test head 200.
- a spring pin has been described here as an example, a structure including a connection that does not use a spring pin, such as capacitive coupling or optical connection, may be employed.
- FIG. 6 schematically shows an example of an exploded view of the probe card 300.
- the probe card 300 includes a wiring board 320, a PCR sheet 340, an interposer 350, a PCR sheet 360, and a membrane unit 370.
- the wiring substrate 320 is formed of an insulating substrate having a relatively high mechanical strength, for example, a polyimide plate.
- the peripheral edge of the wiring board 320 is sandwiched between an upper frame 312 and a lower frame 314 each having a frame shape.
- the upper frame 312 and the lower frame 314 are stacked on each other and fastened by screws 316. Thereby, the mechanical strength of the wiring board 320 is further improved.
- a plurality of guide units 330 are arranged on the upper surface of the wiring board 320.
- the guide unit 330 functions as a connector guide that guides and positions the contactor 202 when the contactor 202 contacts the wiring board 320.
- On the lower surface of the wiring board 320 a plurality of contact pads 323 that can be electrically connected by contact are disposed.
- the contact pad 323 is electrically connected to a contact pad (not shown) disposed inside the guide unit 330 on the upper surface of the wiring board 320.
- the PCR sheet 340 has a through electrode 341 penetrating the front and back.
- the through electrode 341 of the PCR sheet 340 has the same layout as the contact pad 323 on the lower surface of the wiring substrate 320. Thereby, when the wiring board 320 and the PCR sheet 340 are closely stacked, the contact pad 323 and the through electrode 341 are electrically connected to each other.
- the interposer 350 has a contact pad 351 and a contact pad 353 on the upper surface and the lower surface, respectively.
- the contact pad 351 on the upper surface has the same layout as the through electrode 341 of the PCR sheet 340. Thereby, when the PCR sheet 340 and the interposer 350 are stacked closely, the contact pad 351 is electrically connected to the through electrode 341.
- Each of the contact pads 353 on the lower surface corresponds to one of the contact pads 351 on the upper surface, and the corresponding contact pad 351 and the contact pad 353 are electrically connected to each other.
- the contact pads 353 on the lower surface may have a different layout from the contact pads 351 on the upper surface. That is, the pitch between the contact pad 351 and the contact pad 353 may be changed.
- the contact pad 351 on the upper surface of the interposer 350 can be arbitrarily laid out.
- the test pads of the wafer 101 are formed on an integrated circuit, the test area of the test pads is small, and the pitch between the pads is also small.
- the pitch of the contact pads 351 can be made larger than the pitch of the contact pads 353.
- the area of the contact pad 351 can be made larger than the area of the contact pad 353.
- the PCR sheet 360 has a through electrode 361 penetrating the front and back.
- the through electrode 361 of the PCR sheet 360 has the same layout as the contact pad 353 on the lower surface of the interposer 350. Thereby, when the interposer 350 and the PCR sheet 360 are closely stacked, the contact pad 353 and the through electrode 361 are electrically connected to each other.
- the membrane unit 370 includes a contact pad 371, an elastic sheet 372, a bump 373, and a frame 376.
- the elastic sheet 372 is formed of an insulating material having elasticity.
- the elastic sheet 372 may be a polyimide film.
- the frame 376 holds the elastic sheet 372 in a flat state by gripping the peripheral edge of the elastic sheet 372.
- the frame 376 may be formed of a material having a thermal expansion coefficient similar to that of the wafer 101.
- the contact pad 371 is arranged on the upper surface of the elastic sheet 372 with the same layout as the through electrode 361 on the lower surface of the PCR sheet 360. Therefore, when the PCR sheet 340 and the membrane unit 370 are stacked closely, the through electrode 361 and the contact pad 371 are electrically connected to each other.
- the bump 373 is disposed on the lower surface of the elastic sheet 372.
- the bump 373 functions as a contact terminal for the wafer 101 on the lowermost surface of the probe card 300.
- the bump 373 may be an example of a second terminal.
- the bump 373 can also be used as an alignment mark when the wafer 101 and the probe card 300 are aligned.
- Bumps 373 functioning as contact terminals for wafer 101 may be used as alignment marks, or bumps 373 used as alignment marks may be formed separately from the bumps 373.
- the layout of the bumps 373 functioning as contact terminals for the wafer 101 may be the same as the layout of the test pads on the wafer 101.
- the bump 373 used as the alignment mark may be formed in the same process as the bump 373 electrically connected to the test pad.
- Each of the PCR sheet 340, the interposer 350, the PCR sheet 360, and the membrane unit 370 has a through hole 344, a through hole 354, a through hole 364, and a through hole 374 penetrating the front and back. These through holes are arranged so that these through holes communicate with each other when the PCR sheet 340, the interposer 350, the PCR sheet 360, and the membrane unit 370 are stacked. This helps exhaust between the members.
- FIG. 7 schematically shows an example of a partially enlarged sectional view of the membrane unit 370.
- the membrane unit 370 includes a contact pad 371, an elastic sheet 372, a bump 373, a through hole 374, and a frame 376.
- Each of the bumps 373 has a shape with the center protruding downward. Thereby, the bump 373 functions as a contact terminal for the wafer 101 on the lowermost surface of the probe card 300.
- Each of the bumps 373 is electrically connected to one of the contact pads 371 through a through electrode 375 embedded in a through hole formed in the elastic sheet 372.
- the contact pad 371 has the same layout as the through electrode 361 of the PCR sheet 360 and the contact pad 353 on the lower surface of the interposer 350. Thereby, when the membrane unit 370, the PCR sheet 360, and the interposer 350 are laminated, an electrical connection from the bump 373 to the interposer 350 is formed.
- FIG. 8 schematically shows an example of a plan view of the wafer 810 and the probe card 820.
- FIG. 8 shows a state in which the wafer 810 and the probe card 820 are aligned so that the alignment mark 811 and the alignment mark 821 coincide.
- the directions parallel to the surface of the wafer 810 and orthogonal to each other are defined as an X direction and a Y direction.
- the right direction in the figure is the positive direction in the X direction
- the upper direction in the figure is the positive direction in the Y direction.
- the displacement of the relative position obtained by the microscope 430 from the design relative position will be described with respect to the relative positions of the corresponding test pads and bumps.
- a description will be given using a wafer 810 having four test pads and a probe card 820 having four bumps.
- the wafer 810 has a configuration similar to that of the wafer 101.
- Wafer 810 has test pad 812, test pad 814, test pad 816, test pad 818, and alignment mark 811.
- the alignment mark 811 is formed by four bumps.
- the alignment marks 811 are arranged at equal intervals on the peripheral edge of the wafer 810.
- the probe card 820 has the same configuration as the probe card 300.
- the probe card 820 includes bumps 822, bumps 824, bumps 826 and bumps 828, and alignment marks 821.
- Each bump has the same configuration as the bump 373.
- the alignment mark 821 is formed by four bumps.
- the alignment marks 821 are arranged at equal intervals on the peripheral edge of the probe card 820. Note that dotted lines in FIG. 8 indicate the outlines of the respective bumps when the respective bumps are projected onto the wafer 810.
- the alignment mark 811 and the alignment mark 821 are designed so that the corresponding test pads and bumps are in sufficient contact when the wafer 810 and the probe card 820 are aligned so that they coincide with each other.
- the wafer 810 and the probe card 820 are positioned so that the alignment mark 811 and the alignment mark 821 coincide with each other due to a manufacturing error of a test pad or bump, a difference in thermal expansion coefficient between the wafer 810 and the probe card 820, or the like. Even if they are aligned, there is a misalignment between the test pad and the bump.
- the “displacement amount” between the corresponding test pad and the bump represents the amount that the relative position between the corresponding test pad and the bump is displaced from the design relative position. For example, when the center of the test pad and the center of the corresponding bump are designed to coincide with each other, the above “displacement amount” is to measure the positional deviation between the center of the test pad and the center of the corresponding bump. It can be calculated by
- the wafer 810 and the probe card 820 have the same test pad and bump shape, and the alignment mark is used to align the wafer 810 and the probe card 820.
- the case where the center of the corresponding test pad and the bump is designed to coincide is shown.
- the relative position of the test pad 812 and the bump 822, as compared to the design point is displaced by X 2 in the X-direction positive direction is displaced by Y 2 in the positive direction of the Y-direction.
- the relative positions of the test pad 814 and the bump 824 are displaced by X 4 in the negative direction in the X direction, and are displaced by Y 4 in the positive direction in the Y direction.
- the relative position of the test pad 816 and the bump 826 in the positive direction of the X-direction is displaced by X 6, it is displaced by Y 6 in the negative direction of the Y-direction.
- the relative position of the test pad 818 and the bump 828 in the positive direction of the X-direction is displaced by X 8, it is displaced by Y 8 in the negative direction of the Y-direction.
- the displacement amount can be calculated between the test pad on the wafer 101 and the bump on the probe card 300.
- FIG. 9 schematically shows an example of the system configuration of the control system 500.
- the control system 500 is connected to the operation unit 120, the test head 200, the alignment unit 400, the microscope 430, and the storage unit 510.
- the microscope 430 is connected to the storage unit 510.
- the control system 500 receives information related to settings, operations, and the like of the test apparatus 100 from the operation unit 120.
- the control system 500 may receive a set value when searching for an optimum value of the relative position between the wafer 101 and the probe card 300.
- the control system 500 may receive position information of a plurality of test pads provided on the surface of the wafer 101 and position information of a plurality of bumps provided on the surface of the probe card 300.
- the control system 500 notifies the operation unit 120 of information related to the operation state of the test apparatus 100 and information related to the test.
- the control system 500 searches for an optimum value of the relative position between the wafer 101 and the probe card 300. Based on the positional information of the plurality of test pads provided on the surface of the wafer 101 and the positional information of the plurality of bumps provided on the surface of the probe card 300, the control system 500 performs the operation between the wafer 101 and the probe card 300. Determine the relative position. The control system 500 calculates the amount of displacement between each of the plurality of test pads and each of the corresponding plurality of bumps, and in order to make the maximum value of the amount of displacement smaller than a predetermined value, The relative position of may be determined.
- the control system 500 may notify the storage unit 510 of the displacement amount at the determined relative position in association with each of the plurality of bumps.
- Storage unit 510 stores information received from control system 500.
- the storage unit 510 may be an example of a second storage unit.
- the control system 500 may notify the storage unit 510 of the displacement amount at the determined relative position in association with each of a plurality of test pads provided on the surface of the wafer 101.
- the control system 500 receives information on the test result of the wafer 101 from the test head 200.
- the control system 500 controls the test head 200 according to the test program. For example, the control system 500 notifies the test head 200 of information regarding test progress and test data.
- the control system 500 may determine pass / fail of each of a plurality of chips on the wafer 101 as an example of a device under test based on the test result of the wafer 101 received from the test head.
- the control system 500 may notify the storage unit 510 of the quality information of the plurality of chips on the wafer 101 in association with each of the plurality of bumps provided on the surface of the probe card.
- Storage unit 510 may store information received from control system 500.
- the storage unit 510 may be an example of a second storage unit. Further, the control system 500 may notify the storage unit 510 of pass / fail information of the plurality of chips on the wafer 101 in association with each of the plurality of test pads provided on the surface of the wafer 101.
- the control system 500 notifies the alignment unit 400 of information related to the transfer of the wafer 101, information related to the alignment of the wafer 101 and the probe card 300, and the like.
- the alignment unit 400 conveys the wafer 101 to an appropriate test head 200 based on information from the control system 500, aligns the wafer 101 with the corresponding probe card 300, and integrates the wafer 101 and the probe card 300. .
- the control system 500 receives information regarding the current status of the wafer 101 from the alignment unit 400.
- the control system 500 instructs the microscope 430 to image the wafer 101 and the probe card 300.
- the microscope 430 captures images of the wafer 101 and the probe card 300 based on an instruction from the control system 500, and is provided on the surface information of a plurality of test pads provided on the surface of the wafer 101 or on the surface of the probe card 300.
- the position information of the plurality of bumps obtained is acquired.
- the microscope 430 notifies the storage unit 510 of the acquired position information.
- the storage unit 510 stores the position information received from the microscope 430.
- the control system 500 receives information stored in the storage unit 510 from the storage unit 510.
- the control system 500 notifies the storage unit 510 of information received from the operation unit 120, the test head 200, and the alignment unit 400.
- the control system 500 receives information via the communication line, the control system 500 notifies the storage unit 510 of such information.
- Storage unit 510 stores information received from control system 500.
- the control system 500 receives, from the storage unit 510, positional information of a plurality of test pads provided on the surface of the wafer 101 and positional information of a plurality of bumps provided on the surface of the probe card 300, and from the operation unit 120. Based on the received set value, the optimum value of the relative position between the wafer 101 and the probe card 300 is searched and the relative position is determined.
- the amount of displacement from the corresponding bump is calculated for each of the test pads. Then, the relative position between the wafer 101 and the probe card 300 is determined so that the maximum value of the calculated displacement amount becomes smaller than a predetermined value.
- the predetermined value may be a value acceptable by the user received from the operation unit 120.
- the control system 500 may notify the operation unit 120 of the fact, and the operation unit 120 may display the fact on the display 122. .
- control system 500 controls the alignment unit 400 based on the determined relative position to align the wafer 101 and the probe card 300. Thereafter, the control system 500 controls the test head 200 and executes the test of the wafer 101. The control system 500 receives the test result of the wafer 101 from the test head 200.
- control system 500 may analyze the cause of the defect.
- the analysis can be executed by the following procedure, for example.
- the control system 500 may be an example of an analysis unit.
- control system 500 determines whether each of the plurality of bumps is aligned with the corresponding test pad based on the position information of the plurality of test pads and the position information of the plurality of bumps. The displacement amount is calculated. Then, the control system 500 stores the displacement amount in the aligned state in each of the plurality of bumps of the probe card 300 in the storage unit 510. Further, each time the test is executed, the control system 500 stores the result of the test in the storage unit 510 in association with each of the plurality of bumps.
- the control system 500 determines that there is a problem with the wafer 101 or the probe card 300 when the displacement amount at the defective portion is smaller than a predetermined value. Furthermore, regardless of the test object, if a defect occurs when a certain bump is used, it is determined that there is a problem with the probe card 300. On the other hand, when the displacement amount at the defective portion is larger than the predetermined value, it is determined that there is a problem in the connection state between the wafer 101 and the probe card 300. The control system 500 may receive the predetermined value from the operation unit 120.
- the test apparatus 100 includes a plurality of probe cards 300. Further, the test apparatus 100 includes a plurality of test heads 200 corresponding to each of the plurality of probe cards 300 and testing the device under test, and each of the plurality of probe cards 300 is connected to each of the plurality of test heads 200. Connect the test device electrically.
- the control system 500 may control the test apparatus 100 as follows.
- control system 500 controls the alignment unit 400 and the microscope 430 to acquire positional information of a plurality of bumps provided on the surface of each of the plurality of probe cards 300.
- control system 500 controls the alignment unit 400 and the microscope 430 to acquire position information of a plurality of test pads provided on the surface of the wafer 101.
- control system 500 may acquire at least one of the position information of the plurality of bumps and the position information of the plurality of test pads via the operation unit 120 or the communication line.
- the control system 500 determines the wafer 101, the probe card 300, and the probe card 300 for each of the plurality of probe cards 300 based on the position information of the plurality of test pads and the position information of the plurality of bumps in each of the plurality of probe cards 300.
- the optimum value of the relative position is searched and the relative position is determined. For example, for each of the plurality of probe cards 300, the relative position is determined so as to make the maximum value of the displacement amount of the corresponding test pad and bump smaller than a predetermined value. Then, the maximum value of the displacement amount of the test pad and the bump at the relative position determined for each of the probe cards 300 is calculated.
- the control system 500 selects which probe card 300 is used to execute the test. At this time, the control system 500 selects one of the plurality of probe cards 300 based on the maximum value of the displacement amount. For example, the control system 500 selects the probe card 300 having the smallest maximum displacement amount. When the probe card 300 having the smallest maximum displacement is used for the test, the probe card 300 having the next smallest maximum displacement may be selected.
- control system 500 controls the alignment unit 400 to convey the wafer 101 directly below the probe card 300 in order to align the wafer 101 and the selected probe card 300.
- the control system 500 notifies the alignment unit 400 of information on the relative position with respect to the wafer 101 determined for the selected probe card 300.
- the alignment unit 400 adjusts the relative position between the selected probe card 300 and the wafer 101 based on a signal from the control system 500, and electrically connects the selected probe card 300 and the wafer 101.
- test apparatus 100 may have a plurality of probe cards 300 for one test head 200.
- the control system 500 may be realized by hardware or may be realized by software.
- the control system 500 may be a system specialized for testing a device under test, or a general-purpose information processing apparatus such as a personal computer.
- a general-purpose information processing apparatus such as a personal computer.
- an information processing apparatus having a general configuration including a data processing apparatus having a CPU, a ROM, a RAM, a communication interface, and the like, an input apparatus, an output apparatus, and a storage apparatus, the operation of each unit of the test apparatus 100 By starting the specified software, the control system 500 can be realized.
- the control system 500 may be provided by a program that controls the information processing apparatus as described above to realize the control system 500 or a recording medium that records the program.
- a recording medium a magnetic recording medium such as a floppy disk (registered trademark) or a hard disk, an optical recording medium such as a CD-ROM, a magneto-optical recording medium such as an MD, or a semiconductor memory such as an IC card can be used.
- a storage device such as a hard disk or a RAM provided in a server system connected to a dedicated communication network or the Internet may be used as a recording medium, and the program may be provided to the information processing apparatus via the network.
- the specialized system and the information processing apparatus may be configured by a single computer, or may be configured by a plurality of computers distributed on a network.
- the above program is read from the recording medium into the information processing apparatus and controls the operation of the information processing apparatus.
- the information processing apparatus controls the position of the plurality of first terminals provided on the surface of the device under test and the probe card used for testing the device under test by controlling the program.
- Each of the plurality of first terminals based on the procedure of acquiring the position information of the plurality of second terminals provided on the surface of the plurality of terminals, the position information of the plurality of first terminals and the position information of the plurality of second terminals, A displacement amount with each of the corresponding plurality of second terminals is calculated, and a procedure for aligning the device under test and the probe card is executed in order to make the maximum displacement amount smaller than a predetermined value.
- the information processing apparatus executes the same processing as the processing by the control system 500 in FIG.
- control system 500 provided in the main frame 160 controls the operation unit 120, the test head 200, the alignment unit 400, the microscope 430, and the storage unit 510 .
- the configuration of the control system 500 is not limited to this.
- each part of the test apparatus 100 may be responsible for some of the functions of the control system 500.
- the control system 500 may serve as a position information acquisition unit.
- FIG. 10 shows an example of a flowchart of the test method of the test apparatus 100.
- an alignment method and a test method using the test apparatus 100 will be described using the wafer 810 and the probe card 820 shown in FIG.
- position information of a plurality of test pads provided on the surface of the wafer 810 and position information of a plurality of bumps provided on the surface of the probe card 820 are acquired.
- the position information may be acquired by imaging the wafer 810 and the probe card 820 with the microscope 430. In this case, since the position information can be acquired based on the actual image, the influence of the temperature on the displacement can be grasped. Further, the position information may be acquired via the operation unit 120 or a communication line. Thereby, the time required for alignment can be shortened.
- the displacement amount with respect to the corresponding bump is calculated for each of the plurality of test pads.
- displacement amounts X 2 , X 4 , X 6 and X 8 in the X direction and displacement amounts Y 2 , Y 4 , Y 6 and Y 8 in the Y direction are calculated.
- the maximum value of the displacement amount is calculated in each of the positive and negative directions in the X direction and the positive and negative directions in the Y direction.
- the maximum values in the positive and negative directions in the X direction and the positive and negative directions in the Y direction are X 2 , X 4 , Y 4 and Y 6 , respectively.
- the relative position between the wafer 810 and the probe card 820 is determined. For example, the relative position between the wafer 810 and the probe card 820 is determined so that each of the maximum displacement values is smaller than a predetermined value.
- the displacement amount of each of the plurality of bumps with respect to the corresponding test pad in the aligned state may be calculated.
- the displacement amount may be stored for each of the plurality of bumps.
- the above predetermined value may differ depending on the direction.
- the predetermined value in the X direction may be different from the predetermined value in the Y direction.
- the predetermined value in the direction is set to be smaller than the predetermined value in the other direction. May be set. Thereby, a more stable test can be performed.
- the relative position between the wafer 810 and the probe card 820 may be determined so that the sum of the absolute values of the maximum values is smaller than a predetermined value. Further, when obtaining the sum of the absolute values of the maximum values, weighting may be performed depending on the direction.
- the wafer 810 and the probe card 820 are aligned based on the relative position between the wafer 810 and the probe card 820 determined in S1020. Thereafter, in S1040, the wafer 810 is tested. In step S1050, it is determined whether the test result of the wafer 810 is good or bad. In S1050, the test result of the wafer 810 may be stored in association with each of the plurality of bumps. For example, when the test result of the device corresponding to the test pad 812 is defective, the test result of the device and the bump 822 may be stored in association with each other.
- test result of the wafer 810 when the test result of the wafer 810 is satisfactory, the test is terminated.
- the cause of the defect may be analyzed in S1060. For example, when the displacement amount at the defective portion is smaller than a predetermined value, it is determined that there is a problem with the wafer 810 or the probe card 820. On the other hand, when the displacement amount at the defective portion is larger than the predetermined value, it is determined that there is a problem in the connection state between the wafer 810 and the probe card 820. After analyzing the cause of the defect, the test is terminated.
- the position information of the plurality of test pads and the position information of the plurality of bumps are acquired from the wafer 810 and the probe card 820, and based on the maximum value of the displacement amount of the corresponding test pad and bump, The relative position between the wafer 810 and the probe card 820 is determined. Thereby, even if the relative position of the corresponding test pad and bump is displaced from the relative position at the time of design, the contact state of all the test pads and bumps can be improved.
- FIG. 11 shows an example of a flowchart of the relative position determination method in S1020 of FIG. A case where the relative position between the wafer 810 and the probe card 820 is determined so as to minimize the maximum value of the displacement will be described with reference to FIG.
- the amount of displacement from the corresponding bump is calculated for each of the plurality of test pads.
- the displacement amount can be calculated by processing the position information of the plurality of test pads and the position information of the plurality of bumps acquired in S1010 of FIG.
- the maximum values in the positive and negative directions in the X direction and the positive and negative directions in the Y direction are X 2 , X 4 , Y 4, and Y 6 , respectively.
- the maximum displacement amount between the corresponding test pad and bump is calculated in the same manner as in S1110. For example, the relative position between the wafer 810 and the probe card 820 is moved from the state in S1110 by 0.1 micrometers in the positive direction of the X direction, and in each case, the displacement amount of the corresponding test pad and bump is changed. Calculate the maximum value.
- the maximum value of the displacement amount may be calculated for each of the positive and negative directions in the X direction, and the four positive and negative directions in the Y direction.
- the relative position between the wafer 810 and the probe card 820 is moved by 0.1 micrometers in the negative direction in the X direction from the state in S1110.
- the maximum displacement amount between the corresponding test pad and bump is calculated.
- the relative position between the wafer 810 and the probe card 820 is moved by 0.1 micrometers in the positive direction in the Y direction from the state in S1110. The maximum displacement amount between the corresponding test pad and bump is calculated.
- the relative position between the wafer 810 and the probe card 820 is moved by 0.1 micrometers in the negative direction in the Y direction from the state in S1110.
- the maximum displacement amount between the corresponding test pad and bump is calculated.
- the calculation of the maximum value of the displacement amount ends. In this way, for a plurality of cases where the relative positions of the wafer 810 and the probe card 820 are changed, the maximum value of the displacement amount of the corresponding test pad and bump is obtained.
- a case where the maximum value of the displacement amount is minimized is estimated. For example, when the maximum value is calculated for each of the four directions, it is estimated that the maximum value of the displacement amount is minimized when the sum of the absolute values of the maximum values in each direction is the smallest.
- weighting may be performed. The weighting may be performed according to the direction of displacement or the function of the test pad or bump. As another example, a case where the maximum value of the displacement amount is minimized may be estimated using an appropriate interpolation method.
- S1140 it is determined whether or not the maximum value of the displacement estimated in S1130 is smaller than a predetermined value. If it is estimated in S1140 that the maximum value of the displacement amount is estimated to be the minimum, if the maximum value of the displacement amount is smaller than a predetermined value, the relative position between the wafer 810 and the probe card 820 at that time Is used to determine the alignment of the wafer 810 and the probe card 820.
- FIG. 12 shows another example of a flowchart of the test method of the test apparatus 100.
- FIG. 12 shows an example of a test method in which a plurality of probe cards 820 are prepared and the probe card 820 having a better connection state with the wafer 810 is selected.
- the position information of the plurality of bumps is acquired for each of the plurality of probe cards 820.
- position information of a plurality of test pads on the wafer 810 is obtained.
- the relative position of each of the plurality of probe cards 820 with respect to the wafer 810 is determined in the same manner as described with reference to FIGS.
- S1230 it is determined which of the plurality of probe cards 820 is used for alignment.
- the maximum displacement amount at the relative position determined in S1220 is compared, and one of the plurality of probe cards 820 is selected.
- weighting may be performed according to the direction of displacement or the function of the test pad or bump.
- S1240 alignment between the wafer 810 and the probe card 820 selected in S1230 is executed.
- the wafer 810 and the probe card 820 are aligned based on the relative position determined in S1220. Thereby, a test can be performed more stably.
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Abstract
Description
Claims (10)
- 被試験デバイスの表面に設けられた複数の第1端子の位置情報、および、前記被試験デバイスの試験に用いられるプローブカードの表面に設けられた複数の第2端子の位置情報を取得する、位置情報取得部と、
前記位置情報取得部により取得された前記複数の第1端子の位置情報および前記複数の第2端子の位置情報に基づいて、前記複数の第1端子のそれぞれと対応する前記複数の第2端子のそれぞれとの変位量を算出し、前記変位量の最大値を予め定められた値より小さくすべく、前記被試験デバイスと前記プローブカードとの相対位置を決定する制御部と、
前記制御部からの信号に基づいて、前記被試験デバイスと前記プローブカードとの相対位置を調整し、前記被試験デバイスと前記プローブカードとを電気的に接続させる、位置合わせ部と、
を備える、
試験装置。 - 複数の前記プローブカードと、
前記複数のプローブカードのそれぞれに対応し、前記被試験デバイスを試験する、複数のテストヘッドとをさらに備え、
前記複数のプローブカードのそれぞれは、前記複数のテストヘッドのそれぞれと前記被試験デバイスとを電気的に接続する、
請求項1に記載の試験装置。 - 被試験デバイスの表面に設けられた複数の第1端子の位置情報、および、前記被試験デバイスの試験に用いられるプローブカードの表面に設けられた複数の第2端子の位置情報を取得する、位置情報取得部と、
前記位置情報取得部により取得された前記複数の第1端子の位置情報および前記複数の第2端子の位置情報に基づいて、前記複数の第1端子のそれぞれと対応する前記複数の第2端子のそれぞれとの変位量を算出し、前記変位量の最大値を予め定められた値より小さくすべく、前記被試験デバイスと前記プローブカードとの相対位置を決定する、制御部と、
前記制御部により決定された前記相対位置における前記変位量を、前記複数の第2端子のそれぞれと対応づけて記憶する、第1の記憶部と、
前記制御部からの信号に基づいて、前記被試験デバイスと前記プローブカードとの相対位置を調整し、前記被試験デバイスと前記プローブカードとを電気的に接続させる、位置合わせ部と、
前記プローブカードと電気的に接続された前記被試験デバイスを試験する、テストヘッドと、
前記試験の結果を、前記複数の第2端子のそれぞれと対応付けて記憶する、第2の記憶部と、
前記試験により前記被試験デバイスが不良であると判断された場合において、不良箇所における前記変位量が所定値より小さい場合には、前記被試験デバイスまたは前記プローブカードに問題があると判断し、前記不良箇所における前記変位量が所定値より大きい場合には、前記被試験デバイスと前記プローブカードとの接続状態に問題があると判断する、解析部と、
を備える、
試験装置。 - 前記位置情報取得部は、前記被試験デバイスの表面および前記プローブカードの表面の少なくとも一方を撮像する撮像部である、
請求項1から請求項3までのいずれか一項に記載の試験装置。 - 被試験デバイスの表面に設けられた複数の第1端子の位置情報、および、前記被試験デバイスの試験に用いられるプローブカードの表面に設けられた複数の第2端子の位置情報を取得する段階と、
前記複数の第1端子の位置情報および前記複数の第2端子の位置情報に基づいて、前記複数の第1端子のそれぞれと、対応する前記複数の第2端子のそれぞれとの変位量を算出し、前記変位量の最大値を予め定められた値より小さくすべく、前記被試験デバイスと前記プローブカードとを位置合わせする段階と、
を備える、
試験方法。 - 前記変位量の最大値を最小とすべく、前記被試験デバイスと前記プローブカードとを位置合わせする、
請求項5に記載の試験方法。 - 前記位置合わせする段階は、
前記被試験デバイスと前記プローブカードとの相対位置を変化させた複数の場合について、前記変位量の最大値を算出する段階と、
前記複数の場合について算出された前記変位量の最大値に基づいて、前記被試験デバイスと前記プローブカードとの相対位置を決定する段階と、
を有する
請求項5または請求項6に記載の試験方法。 - 前記位置情報を取得する段階は、
複数の前記プローブカードを準備する段階と、
前記複数のプローブカードのそれぞれについて、前記複数の第2端子の位置情報を取得する段階と、
を有し、
前記位置合わせする段階は、
前記変位量の最大値を予め定められた値より小さくすべく、前記被試験デバイスと前記複数のプローブカードのそれぞれとの相対位置を決定する段階と、
決定された前記相対位置における前記変位量の最大値に基づいて、前記複数のプローブカードのいずれかを選択する段階と、
を有し、
前記相対位置を決定する段階で決定された前記相対位置に基づいて、前記被試験デバイスと、前記複数のプローブカードのいずれかを選択する段階で選択された前記プローブカードとを位置合わせする、
請求項5から請求項7までの何れか一項に記載の試験方法。 - 前記複数の第1端子の位置情報および前記複数の第2端子の位置情報に基づいて、前記複数の第2端子のそれぞれについて、位置合わせされた状態における、対応する第1端子との変位量を算出する段階と、
前記複数の第2端子のそれぞれについて、位置合わせされた状態における前記変位量を記憶する段階と、
前記被試験デバイスを試験する段階と、
前記試験の結果を、前記複数の第2端子のそれぞれと対応付けて記憶する段階と、
を更に備え、
前記試験により前記被試験デバイスが不良であると判断された場合に、
不良箇所における前記変位量が所定値より小さい場合には、前記被試験デバイスまたは前記プローブカードに問題があると判断し、
前記不良箇所における前記変位量が所定値より大きい場合には、前記被試験デバイスと前記プローブカードとの接続状態に問題があると判断する、
請求項5から請求項8までの何れか一項に記載の試験方法。 - 被試験デバイスを試験する試験装置に、
被試験デバイスの表面に設けられた複数の第1端子の位置情報、および、前記被試験デバイスの試験に用いられるプローブカードの表面に設けられた複数の第2端子の位置情報を取得する手順と、
前記複数の第1端子の位置情報および前記複数の第2端子の位置情報に基づいて、前記複数の第1端子のそれぞれと、対応する前記複数の第2端子のそれぞれとの変位量を算出し、前記変位量の最大値を予め定められた値より小さくすべく、前記被試験デバイスと前記プローブカードとを位置合わせする手順と、
を実行させる、
プログラム。
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KR1020107019059A KR101023178B1 (ko) | 2009-09-02 | 2009-09-02 | 시험 장치, 시험 방법 및 프로그램 |
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US12/869,545 US8493083B2 (en) | 2009-09-02 | 2010-08-26 | Test apparatus, test method and computer readable medium |
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DE112009005202T5 (de) | 2012-07-19 |
US20110128024A1 (en) | 2011-06-02 |
KR101023178B1 (ko) | 2011-03-18 |
JP4480796B1 (ja) | 2010-06-16 |
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US8493083B2 (en) | 2013-07-23 |
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