WO2014157123A1 - 基板検査装置及び基板温度調整方法 - Google Patents
基板検査装置及び基板温度調整方法 Download PDFInfo
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- WO2014157123A1 WO2014157123A1 PCT/JP2014/058153 JP2014058153W WO2014157123A1 WO 2014157123 A1 WO2014157123 A1 WO 2014157123A1 JP 2014058153 W JP2014058153 W JP 2014058153W WO 2014157123 A1 WO2014157123 A1 WO 2014157123A1
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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]
- G01R31/2855—Environmental, reliability or burn-in testing
- G01R31/2872—Environmental, reliability or burn-in testing related to electrical or environmental aspects, e.g. temperature, humidity, vibration, nuclear radiation
- G01R31/2874—Environmental, reliability or burn-in testing related to electrical or environmental aspects, e.g. temperature, humidity, vibration, nuclear radiation related to temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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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
- G01R31/2601—Apparatus or methods therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67109—Apparatus for thermal treatment mainly by convection
Definitions
- the present invention relates to a substrate inspection apparatus and a substrate temperature adjustment method for inspecting a substrate mounted on a mounting table.
- a prober is known as an apparatus for inspecting electrical characteristics of a semiconductor device such as a power device or a memory formed on a semiconductor wafer (hereinafter referred to as “wafer”) as a substrate.
- the prober includes a probe card having a large number of probe needles and a stage on which a wafer is placed and moves freely up, down, left and right, and each probe needle of the probe card is brought into contact with an electrode pad or a solder bump of the semiconductor device.
- the electrical characteristics of the semiconductor device are inspected by passing an inspection current from each probe needle to the electrode pad or solder bump.
- the prober has a test head that determines whether the semiconductor device is good or defective based on the inspection result of the electrical characteristics of the semiconductor device by the probe card (see, for example, Patent Document 1).
- the prober sometimes inspects the electrical characteristics of the semiconductor device in a high temperature environment where the wafer is heated.
- an inspection current is applied to the inspection circuit of the power device or when an inspection current is applied to each of the inspection circuits of a large number of memories formed on the wafer, the amount of heat generated from the wafer is large. Therefore, the electrical characteristics of the semiconductor device may be inspected while cooling the wafer.
- the stage 70 incorporates a heater 71, the medium flow path 72 passes through the stage 70, and a low temperature medium is supplied from the chiller 73 to the medium flow path 72.
- the wafer W placed on the stage 70 is heated and cooled by controlling on / off of 71 and the supply amount of the low-temperature medium to the medium flow path 72.
- the chiller 73 supplies a low temperature medium of, for example, ⁇ 30 ° C.
- the temperature rises to a high temperature, for example, 95 ° C. by passing an inspection current to the inspection circuit of the power device.
- the low-temperature medium is supplied to the medium flow path 72 in order to cool the wafer W to a desired temperature, for example, 85 ° C.
- the temperature difference between the desired temperature and the low-temperature medium is large. There is a problem that it is difficult to maintain the wafer W at a desired temperature.
- the temperature of the wafer W can be brought close to the desired temperature, but the desired temperature cannot be reached.
- An object of the present invention is to provide a substrate inspection apparatus and a substrate temperature adjustment method capable of adjusting a substrate to a desired temperature.
- a mounting table for mounting a substrate on which a semiconductor device is formed, an inspection unit for inspecting the electrical characteristics of the semiconductor device of the previously placed substrate
- a substrate inspection apparatus comprising: a temperature adjusting unit that adjusts the temperature of the mounting table; and a medium channel that passes through the mounting table, wherein the temperature adjusting unit supplies a high-temperature medium to the medium channel.
- a substrate inspection apparatus comprising: a supply unit; a low-temperature medium supply unit that supplies a low-temperature medium to the medium flow path; and a medium mixing unit that mixes the high-temperature medium supplied to the medium flow path and the low-temperature medium.
- the medium mixing unit includes a first control valve that controls a flow rate of the high-temperature medium and a second control valve that controls a flow rate of the low-temperature medium, and the high-temperature medium and the low-temperature medium. It is preferable that the first control valve controls the flow rate of the hot medium and the second control valve controls the flow rate of the cold medium before mixing.
- the medium flow path has a branch point that branches into a circulation path downstream of the mounting table, and the circulation path is connected to the medium flow path at a junction between the medium mixing unit and the mounting table. It is preferable to have a pump that is connected and further pumps the hot medium and the cold medium mixed from the branch point to the junction.
- the substrate is a disk-shaped semiconductor wafer, and the diameter of the substrate is 300 mm or more.
- the temperature of the high temperature medium is 20 ° C to 180 ° C
- the temperature of the low temperature medium is -100 ° C to 60 ° C.
- a temperature sensor disposed on the mounting table is further provided.
- a substrate temperature adjusting method in a substrate inspection apparatus comprising: a temperature adjusting unit that adjusts the temperature of the mounting table; and a medium flow path that passes through the mounting table, wherein the temperature adjusting unit transfers a high-temperature medium to the medium flow path.
- a substrate temperature adjustment method comprising: a high-temperature medium supply unit that supplies a low-temperature medium to the medium flow path, and a mixture of the high-temperature medium and the low-temperature medium that is supplied to the medium flow path Is provided.
- the medium flow path branches into a circulation path between branch points downstream of the mounting table, and the circulation path is connected to the medium flow path at a junction point upstream of the mounting table. It is preferable to circulate the medium flow path between the branch points and the high-temperature medium and the low-temperature medium mixed in the circulation path.
- the temperature adjustment unit includes a heater arranged on the mounting table, and raises an upper limit value of a temperature adjustment range of the mounting table by operating the heater.
- the temperature adjustment unit further includes a Peltier element disposed on the mounting table, and operates the Peltier element as a heating element to increase an upper limit value of a temperature adjustment range of the mounting table, It is preferable to lower the lower limit value of the temperature adjustment range of the mounting table by operating as a cooling element.
- the temperature of the medium flowing through the medium flow path can be adjusted, and the medium is mounted on the mounting table.
- the temperature of the substrate can be adjusted by a medium whose temperature is adjusted. As a result, the substrate can be adjusted to a desired temperature.
- FIG. 8 is a diagram schematically showing a comparison of temperature adjustment ranges of the two stages of FIGS. 7A and 7B. It is a block diagram which shows schematic structure of the temperature control system in the conventional prober.
- FIG. 1 is a perspective view showing a schematic configuration of a prober 10 as a substrate inspection apparatus according to a first embodiment of the present invention.
- the prober 10 covers a main body 12 including a stage 11 (substrate mounting table) on which a wafer W is mounted, a loader 13 disposed adjacent to the main body 12, and the main body 12.
- a test head 14 (inspection unit) is provided, and the electrical characteristics of a semiconductor device formed on a disk-shaped wafer W having a large diameter, for example, a diameter of 300 mm or 450 mm, are inspected.
- the main body 12 has a hollow casing shape inside.
- the ceiling portion 12 a of the main body 12 is provided with an opening 12 b that opens above the wafer W placed on the stage 11.
- a probe card 17 (see FIG. 2), which will be described later, is disposed in the opening 12b, and the probe card 17 faces the wafer W.
- the wafer W is electrostatically attracted to the stage 11 so that the relative position with respect to the stage 11 does not shift.
- the test head 14 has a rectangular shape and is configured to be rotatable upward by a hinge mechanism 15 provided on the main body 12. When the test head 14 covers the main body 12, the test head 14 is electrically connected to the probe card 17 through a contact ring (not shown).
- the test head 14 also includes a data storage unit (not shown) that stores an electrical signal indicating the electrical characteristics of the semiconductor device transmitted from the probe card 17 as measurement data, and a semiconductor on the wafer W to be inspected based on the measurement data.
- a determination unit (not shown) that determines the presence or absence of an electrical defect in the device is included.
- the loader 13 takes out the wafer W on which the semiconductor device is formed, which is accommodated in a FOUP or MAC (not shown), which is a transfer container for the wafer W, and places the wafer W on the stage 11 of the main body 12.
- the wafer W whose electrical characteristics have been inspected is taken out of the stage 11 and stored in the FOUP or MAC.
- a large number of probe needles (not shown) are arranged on the lower surface of the probe card 17 corresponding to the electrode pads and solder bumps of the semiconductor device on the wafer W.
- the stage 11 adjusts the relative positions of the probe card 17 and the wafer W to bring the electrode pads of the semiconductor device into contact with the probe needles.
- the test head 14 When the electrode pads or the like of the semiconductor device are brought into contact with the probe needles, the test head 14 sends an inspection current to the semiconductor devices via the probe needles of the probe card 17 and then an electric signal indicating the electrical characteristics of the semiconductor devices. Is transmitted to the data storage unit of the test head 14.
- the data storage unit of the test head 14 stores the transmitted electrical signal as measurement data, and the determination unit determines the presence / absence of an electrical defect in the semiconductor device to be inspected based on the stored measurement data.
- FIG. 2 is a perspective view showing a schematic configuration of a moving mechanism of the stage 11 provided in the prober 10 of FIG.
- the moving mechanism 18 of the stage 11 includes a Y stage 19 that moves along the Y direction shown in FIG. 2, and an X stage 20 that moves along the X direction shown in FIG. And a Z moving part 21 that moves along the Z direction shown in the figure.
- the Y stage 19 is driven with high accuracy in the Y direction by the rotation of the ball screw 22 arranged along the Y direction, and the ball screw 22 is rotated by the Y stage motor 23 which is a step motor.
- the X stage 20 is driven in the X direction with high accuracy by the rotation of the ball screw 24 arranged along the X direction.
- the ball screw 24 is also rotated by an X stage motor (not shown) which is a step motor.
- the stage 11 is disposed on the Z moving unit 21 so as to be movable in the ⁇ direction shown in FIG. 2, and the wafer W is placed on the stage 11.
- the moving mechanism 18 the Y stage 19, the X stage 20, the Z moving unit 21 and the stage 11 cooperate to move the semiconductor device formed on the wafer W to a position facing the probe card 17, and further, the semiconductor device Electrode pads and the like are brought into contact with each probe needle.
- a temperature adjustment system 25 for heating and cooling the stage 11 that electrostatically attracts the wafer W is attached to the prober 10 correspondingly.
- the temperature adjustment system 25 can heat the wafer W via the stage 11 and can also cool it.
- FIG. 3 is a block diagram showing a schematic configuration of the temperature adjustment system 25 provided in the prober 10 of FIG.
- FIG. 4 is a piping diagram showing the arrangement of the valves in the temperature adjustment system 25 of FIG.
- the temperature adjustment system 25 includes, for example, a high temperature chiller 26 (high temperature medium supply unit) that supplies a high temperature medium having a temperature of 20 ° C. to 180 ° C. and a low temperature medium having a temperature of ⁇ 100 ° C. to 60 ° C.
- a low-temperature chiller 27 (low-temperature medium supply unit) that supplies the temperature
- a temperature control channel 28 (medium channel) that passes through the stage 11, and a mixing interposed between the temperature control channel 28, the high-temperature chiller 26, and the low-temperature chiller 27.
- a valve unit 29 (medium mixing unit), a high temperature medium supply path 30 that connects the high temperature chiller 26 and the mixing valve unit 29, and a low temperature medium supply path 31 that connects the low temperature chiller 27 and the mixing valve unit 29 are provided.
- the high temperature medium and the low temperature medium supplied by each of the high temperature chiller 26 and the low temperature chiller 27 are made of the same type of medium, and for example, pure water, Galden (registered trademark), Florinart (registered trademark), or the like is used.
- the high temperature medium supplied by the high temperature chiller 26 reaches the mixing valve unit 29 via the high temperature medium supply path 30, and the low temperature medium supplied by the low temperature chiller 27 passes through the low temperature medium supply path 31.
- the mixing valve unit 29 mixes the high temperature medium and the low temperature medium, and the mixed high temperature medium and low temperature medium (hereinafter simply referred to as “mixing medium”) flows through the temperature control flow path 28.
- the mixed medium supplies heat to the stage 11 or absorbs the heat of the stage 11, thereby adjusting the temperature of the wafer W through the stage 11.
- the temperature control flow path 28 branches into a first return path 33 and a second return path 34 at a first branch point 32 located downstream of the stage 11, and the first return path 33 is connected to the high temperature chiller 26.
- the second reflux path 34 is connected to the low temperature chiller 27. Therefore, the mixed medium in which the temperature of the stage 11 is adjusted returns to both the high temperature chiller 26 and the low temperature chiller 27.
- the mixing valve unit 29 and the first reflux path 33 are connected by a high temperature medium reflux path 35, and the mixing valve unit 29 and the second reflux path 34 are connected by a low temperature medium reflux path 36.
- the mixing valve unit 29 includes a high-temperature medium diversion valve 37 (first control valve) interposed between the high-temperature medium supply path 30, the temperature adjustment flow path 28, and the high-temperature medium reflux path 35, and a low temperature A low-temperature medium diversion valve 38 (second control valve) interposed between the medium supply path 31, the temperature adjustment flow path 28, and the low-temperature medium reflux path 36 is provided.
- first control valve high-temperature medium diversion valve
- second control valve second control valve
- the high temperature medium diversion valve 37 diverts the high temperature medium flowing in via the high temperature medium supply path 30 to the temperature adjustment flow path 28 and the high temperature medium recirculation path 35, and also separates the high temperature medium into the temperature adjustment flow path 28 and the high temperature medium.
- the flow rate to the medium reflux path 35 is controlled.
- the low-temperature medium diverter valve 38 diverts the low-temperature medium flowing in via the low-temperature medium supply path 31 to the temperature adjustment flow path 28 and the low-temperature medium return path 36, and the flow rate of the low-temperature medium to the temperature adjustment flow path 28 and the low temperature
- the flow rate to the medium reflux path 36 is controlled.
- the hot medium whose flow rate is controlled by the hot medium diversion valve 37 and the cold medium whose flow rate is controlled by the cold medium diversion valve 38 are merged and mixed downstream of the hot medium diversion valve 37 and the cold medium diversion valve 38. Is done.
- the temperature of the mixed medium is determined by the partial flow rate of the high-temperature medium and the partial flow rate of the low-temperature medium. Therefore, the temperature adjustment system 25 can adjust the temperature of the mixed medium by controlling the partial flow rate of the high-temperature medium and the partial flow rate of the low-temperature medium. For example, when the mixed medium is at a high temperature, the partial flow rate of the high temperature medium is increased, and the partial flow rate of the low temperature medium is decreased. When the mixed medium is at a low temperature, the partial flow rate of the low temperature medium is increased. Reduce the partial flow rate of the hot medium.
- Both the high temperature medium diversion valve 37 and the low temperature medium diversion valve 38 can reduce the flow rate of the high temperature medium to the temperature control channel 28 and the flow rate of the low temperature medium to the temperature control channel 28, thereby In addition, the adjustment range of the temperature of the mixed medium can be expanded.
- a first mixed medium control valve 39 is disposed in the first reflux path 33, and a second mixed medium control valve 40 is disposed in the second reflux path 34.
- first mixed medium control valve 39 When the first mixed medium control valve 39 is closed, heat is supplied to the stage 11 or mixed medium that has absorbed the heat of the stage 11 (hereinafter referred to as “temperature-controlled mixed medium”) is returned to the high-temperature chiller 26. To prevent it.
- second mixed medium control valve 40 is closed to prevent the mixed medium from returning to the low-temperature chiller 27 after the temperature adjustment.
- a high temperature medium control valve 41 is disposed in the high temperature medium recirculation path 35, and the mixed medium after temperature adjustment flowing through the first recirculation path 33 flows into the mixing valve unit 29 by closing the high temperature medium control valve 41. To prevent it. Further, a low temperature medium control valve 42 is disposed in the low temperature medium reflux path 36, and when the low temperature medium control valve 42 is closed, the mixed medium after temperature adjustment flowing through the second reflux path 34 is mixed with the mixing valve unit 29. Is prevented from entering.
- a temperature sensor 43 is disposed in the temperature control channel 28 between the mixing valve unit 29 and the stage 11, and the temperature sensor 43 measures the temperature of the mixed medium. Further, the temperature sensor 43 is connected to the controller 44, and the controller 44 controls the operation of the high temperature medium diversion valve 37 and the low temperature medium diversion valve 38 based on the measured temperature of the mixed medium, thereby dividing the flow rate of the high temperature medium. And the temperature of the mixed medium is adjusted by controlling the partial flow rate of the low temperature medium. The controller 44 also controls operations of valves other than the high-temperature medium diversion valve 37 and the low-temperature medium diversion valve 38, for example, the first mixed medium control valve 39 and the second mixed medium control valve 40.
- the controller 44 is connected to a temperature sensor 45 provided on the stage 11.
- the temperature of the mixed medium may be adjusted by the controller 44 based on the temperature of the stage 11 measured by the temperature sensor 45.
- the controller 44 is connected to a temperature sensor (not shown) included in the semiconductor device formed on the wafer W, and the temperature of the mixed medium is adjusted by the controller 44 based on the temperature of the semiconductor device measured by the temperature sensor. You may do it.
- the high-temperature medium and the low-temperature medium supplied to the temperature control flow path 28 that passes through the stage 11 are mixed, so that the mixed medium that flows through the temperature control flow path 28 is mixed.
- the temperature of the wafer W placed on the stage 11 can be adjusted via the stage 11 with a mixed medium whose temperature has been adjusted. As a result, the wafer W can be adjusted to a desired temperature.
- the flow rate of the high temperature medium is controlled by the high temperature medium diversion valve 37 before the high temperature medium and the low temperature medium are mixed, and the flow rate of the low temperature medium is controlled by the low temperature medium diversion valve 38. Since the temperature of the mixed medium is adjusted by mixing the low temperature medium, it is possible to easily adjust the temperature of the mixed medium only by controlling the flow rates of the high temperature medium and the low temperature medium.
- the configuration and operation of the present embodiment are basically the same as those of the first embodiment described above.
- the temperature control flow is performed without refluxing the mixed medium to the high temperature chiller 26 or the low temperature chiller 27.
- the second embodiment is different from the first embodiment in that the circulation path including the path 28 is configured to be circulated. Therefore, the description of the duplicated configuration and operation will be omitted, and different configurations and operations will be described below.
- FIG. 5 is a block diagram showing a schematic configuration of the temperature adjustment system 46 provided in the prober 10 as the substrate inspection apparatus according to the present embodiment.
- FIG. 6 shows the arrangement of the valves in the temperature adjustment system 46 of FIG. It is a piping diagram shown.
- the temperature control flow path 28 branches to the circulation path 48 at the second branch point 47 located downstream of the stage 11.
- the circulation path 48 is connected to the temperature control flow path 28 at a junction 49 located between the mixing valve unit 29 and the stage 11.
- a pressure feed pump 50 is disposed in the circulation path 48, and the pressure feed pump 50 pumps the mixed medium from the second branch point 47 toward the junction 49. The operation of the pressure feed pump 50 is controlled by the controller 44.
- a check valve 51 is disposed in the circulation path 48 between the junction 49 and the pressure feed pump 50, thereby preventing a backflow of the mixed medium in the circulation path 48.
- the circulation path 48 has a branch path 52 that branches between the check valve 51 and the pressure feed pump 50 and that joins the second return path 34 downstream of the second branch point 47. For example, when the pressure of the mixed medium in the circulation path 48 increases rapidly, the branch path 52 returns a part of the mixed medium to the second reflux path 34 to adjust the pressure in the circulation path 48.
- a control valve 53 is provided in the branch path 52.
- a circulation channel is formed by the circulation channel 48 and the temperature control channel 28 between the junction 49 and the second branch point 47, and the pressure feed pump 50 pumps the mixed medium to perform mixing.
- the medium is circulated in the circulation channel. Therefore, the flow rate of the mixed medium flowing through the temperature control channel 28 passing through the stage 11 can be increased, and when the mixed medium performs heat exchange with the wafer W via the stage 11, the temperature of the mixed medium is increased. A sudden change can be prevented. As a result, temperature uniformity in the stage 11 can be ensured.
- the temperature adjustment system 46 can absorb a large amount of heat from the wafer W by circulation of the circulation path of the mixed medium, the temperature adjustment system 46 inspects the electrical characteristics of the power device that generates a large amount of heat. It can also be suitably used for batch inspection of electrical characteristics of a large number of memories.
- the circulation path 48 is disposed nearer the stage 11 than the high temperature chiller 26 and the low temperature chiller 27, so that the flow rate of the mixed medium flowing through the temperature control flow path 28 is increased by the pressure feed pump 50.
- the pressure loss in the circulation path 48 is less than the pressure loss when the flow rate of the mixed medium is increased by the high-temperature chiller 26 or the low-temperature chiller 27. Therefore, the flow rate of the mixed medium can be effectively increased.
- the first mixed medium control valve 39 and the first mixed medium control valve 39. 2 is closed, and the operation of the high-temperature medium diversion valve 37 and the low-temperature medium diversion valve 38 is controlled to stop the flow of new high-temperature medium and low-temperature medium into the temperature control flow path 28. You may do it.
- the mixed medium flows and circulates only through the circulation flow path. However, even if the temperature of the wafer W slightly fluctuates, the circulating mixed medium absorbs the heat of the wafer W or heats the wafer W.
- the pressure pump 50 and the circulation path 48 may be built in the stage 11 or may be arranged outside the main body 12 without being built in the stage 11.
- the second branch point 47 may be located upstream of the first branch point 32 as shown in FIG. 5, or downstream of the first branch point 32 as shown in FIG. May be located.
- stage 11 provided in the prober 10 as the substrate inspection apparatus according to each of the above embodiments and to which the temperature adjustment systems 25 and 46 are applied will be described.
- FIGS. 7A, 7 ⁇ / b> B, and 8 two stages 11 ⁇ / b> A and 11 ⁇ / b> B will be specifically described as examples of the stage 11, and these will be described.
- FIG. 7A is a cross-sectional view showing a schematic structure of a stage 11A that is a first example of the stage 11, and FIG. 7B is a cross-sectional view showing a schematic structure of a stage 11B that is a second example of the stage 11.
- the temperature of the stage 11 is adjusted by the mixed medium flowing through the temperature adjustment flow path 28 passing through the stage 11 by the temperature adjustment systems 25 and 46. Therefore, in principle, the stage 11 itself does not require a heating mechanism and a cooling mechanism in order to adjust the temperature of the stage 11. Therefore, the stage 11A of FIG. 7A has a simple structure in which the temperature control flow path 28 is formed inside and no other heating mechanism and cooling mechanism are provided.
- the temperature adjustment range of the stage 11A depends on the physical properties of the medium used as the high temperature medium and the low temperature medium. Therefore, when the temperature adjustment range is to be changed or expanded, it is necessary to take measures such as changing the medium. Therefore, in order to make it possible to widen the temperature range that can be adjusted by the temperature adjustment systems 25 and 46 with a simple structure, a cooling mechanism and a heating mechanism constituting the temperature adjustment systems 25 and 46 are provided in the stage 11A. Is the stage 11B of FIG. 7B.
- the stage 11B includes a heater 61 as a heating mechanism, and a Peltier element (thermoelectric element) 62 as a heating mechanism and a cooling mechanism.
- the heater 61 By operating the heater 61, the temperature adjustment range of the stage 11B can be expanded to the high temperature side.
- the Peltier element 62 is used as a heating element, the temperature adjustment range of the stage 11B can be expanded to the high temperature side.
- the temperature adjustment range of the stage 11B can be expanded to the low temperature side.
- the operation control of the heater 61 and the Peltier element 62 is performed by the controller 44.
- FIG. 8 is a diagram schematically showing a comparison of the temperature adjustment ranges of the stage 11A and the stage 11B.
- the conditions other than the structures of the stage 11A and the stage 11B are the same.
- T1 110 ° C.
- T2 ⁇ 30 ° C.
- the upper limit temperature capable of temperature adjustment is set to the temperature T1.
- T3 T1 ° C.
- T4 150 ° C.
- T1 to T4 are merely examples and do not limit the present invention.
- the heater 61 is operated and / or the Peltier element 62 is operated as a heating element, so that the temperature rising rate is higher than when only the mixed medium is used. Can be faster.
- the Peltier element 62 is operated as a cooling element, the temperature lowering rate can be made faster than when only the mixed medium is used.
- the temperature of the stage 11B may be set to a temperature exceeding the boiling point of the medium used as the high temperature medium and the low temperature medium.
- the stage 11B is made of a material having a good thermal conductivity such as copper, the temperature distribution that causes trouble in the inspection of the wafer W on the surface of the stage 11B even if the medium boils. (Temperature non-uniformity) does not occur.
- the Peltier element 62 is arrange
- the heater 61 may not be provided and only the Peltier element 62 may be provided. Even in this case, the temperature adjustment range can be expanded to the high temperature side and the low temperature side.
- a modified example of the stage 11B a configuration in which only the heater 61 is provided without the Peltier element 62 may be provided, and in this case, the temperature adjustment range can be widened to the high temperature side.
- this invention is not limited to said each embodiment.
- pure water, Galden, or Fluorinert is used as the high-temperature medium, but when a medium having a temperature higher than the boiling point of these mediums is required, the high-temperature medium supply path 30 Alternatively, pressure may be applied to all the paths such as the low-temperature medium supply path 31 to raise the boiling point of pure water or the like.
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Abstract
Description
10 プローバ
11 ステージ
14 テストヘッド
25,46 温度調整システム
26 高温チラー
27 低温チラー
28 調温流路
29 混合バルブユニット
47 第2の分岐点
48 循環路
49 合流点
50 圧送ポンプ
61 ヒータ
62 ペルチェ素子
Claims (13)
- 半導体デバイスが形成された基板を載置する載置台と、前記載置された基板の前記半導体デバイスの電気的特性を検査する検査部と、前記載置台の温度を調整する温度調整部と、前記載置台を通過する媒体流路とを備える基板検査装置であって、
前記温度調整部は、高温媒体を前記媒体流路へ供給する高温媒体供給部と、低温媒体を前記媒体流路へ供給する低温媒体供給部と、前記媒体流路へ供給される前記高温媒体及び前記低温媒体を混合する媒体混合部とを有することを特徴とする基板検査装置。 - 前記媒体混合部は、前記高温媒体の流量を制御する第1の制御弁と、前記低温媒体の流量を制御する第2の制御弁とを有し、前記高温媒体及び前記低温媒体を混合する前に、前記第1の制御弁は前記高温媒体の流量を制御するとともに、前記第2の制御弁は前記低温媒体の流量を制御することを特徴とする請求項1記載の基板検査装置。
- 前記媒体流路は前記載置台の下流において循環路に分岐する分岐点を有し、
前記循環路は、前記媒体混合部及び前記載置台の間の合流点において前記媒体流路へ接続され、さらに前記分岐点から前記合流点へ混合された前記高温媒体及び前記低温媒体を圧送するポンプを有することを特徴とする請求項1記載の基板検査装置。 - 前記基板は円板状の半導体ウエハであり、前記基板の直径は300mm以上であることを特徴とする請求項1記載の基板検査装置。
- 前記高温媒体の温度は20℃~180℃であり、前記低温媒体の温度は−100℃~60℃であることを特徴とする請求項1記載の基板検査装置。
- 前記媒体混合部及び前記載置台の間において前記媒体流路に配置される温度センサをさらに備えることを特徴とする請求項1記載の基板検査装置。
- 前記載置台に配置される温度センサをさらに備えることを特徴とする請求項1記載の基板検査装置。
- 前記載置台に配置されるヒータ及びペルチェ素子の一方又は両方をさらに備えることを特徴とする請求項1記載の基板検査装置。
- 半導体デバイスが形成された基板を載置する載置台と、前記載置された基板の前記半導体デバイスの電気的特性を検査する検査部と、前記載置台の温度を調整する温度調整部と、前記載置台を通過する媒体流路とを備える基板検査装置における基板温度調整方法であって、
前記温度調整部は、高温媒体を前記媒体流路へ供給する高温媒体供給部と、低温媒体を前記媒体流路へ供給する低温媒体供給部とを有し、
前記高温媒体及び前記低温媒体を混合して前記媒体流路へ供給することを特徴とする基板温度調整方法。 - 前記高温媒体及び前記低温媒体を混合する前に、前記高温媒体の流量を制御するとともに、前記低温媒体の流量を制御することを特徴とする請求項9記載の基板温度調整方法。
- 前記媒体流路は前記載置台の下流の分岐点の間において循環路に分岐し、前記循環路は前記載置台の上流の合流点において前記媒体流路に接続され、
前記合流点及び前記分岐点の間における前記媒体流路、並びに前記循環路において混合された前記高温媒体及び前記低温媒体を循環させることを特徴とする請求項9記載の基板温度調整方法。 - 前記温度調整部は、前記載置台に配置されるヒータを備え、
前記ヒータを動作させることにより、前記載置台の温度調整範囲の上限値を上げることを特徴とする請求項9記載の基板温度調整方法。 - 前記温度調整部は、前記載置台に配置されるペルチェ素子をさらに備え、
前記ペルチェ素子を加熱素子として動作させることにより前記載置台の温度調整範囲の上限値を上げ、前記ペルチェ素子を冷却素子として動作させることにより前記載置台の前記温度調整範囲の下限値を下げることを特徴とする請求項9記載の基板温度調整方法。
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