JP2012151284A - Wiring board for probe card, and probe card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring board for a probe card which has a surface wiring layer having high adhesive strength to an insulting substrate formed of a sintered mullite-based body, and the probe card using the same.SOLUTION: In the wiring board for a probe card including an insulating substrate 11 of which at least ceramic insulating layers 11a and 11d on an outermost layer are formed of sintered mullite-based bodies, a via conductor 14 provided in at least the inside of the ceramic insulating layers 11a and 11d on the outermost layer, and a surface wiring layer 13 which is connected to the via conductor 14, has a larger area than that of the via conductor 14 in a plan view of the insulating substrate 11 and is formed of a metal film provided on the surface of the insulating substrate 11, the via conductor 14 contains at least one kind of metal of molybdenum and tungsten as a main component, the ceramic insulating layers 11a and 11d on the outermost layer have a first region 11A in the periphery of the via conductor 14 and a second region 11B other than the first region 11A, and the first region 11A has a larger amount of alumina with respect to mullite than that of the second region 11B.

Description

  The present invention relates to a probe card wiring board provided with fine wiring for measuring electrical characteristics of a semiconductor wafer and a probe card using the same.

  For semiconductor elements with large-scale integrated circuits that are simultaneously formed on a semiconductor wafer such as a Si wafer, a product with poor electrical connection and electrical characteristics at a substantially constant rate due to electrical failure due to adhesion of foreign matter, etc. It is included. As a device for detecting a defective product of the semiconductor element, there is known a probe card capable of collectively inspecting electrical characteristics of a large number of semiconductor elements at the same time in a semiconductor wafer state.

  As shown in FIG. 2, the probe card includes an insulating base 111 made of a mullite sintered body, an internal wiring layer 112 made of tungsten, molybdenum, or an alloy thereof and via conductors on the main surface and inside of the insulating base 111. 114 and a ceramic wiring substrate 100 having a surface wiring layer 113 formed so as to cover the via conductor 114 exposed on the surface of the insulating substrate 111, and a pedestal 116 provided on the surface wiring layer 113. The probe pin 117 is formed in a shape. By applying this probe pin 117 to the terminals of a number of semiconductor elements, the output when a voltage is applied is measured and compared with the expected value. The quality of these semiconductor elements is collectively determined (for example, see Patent Document 1). Here, the surface wiring layer 113 is usually composed of a metal film formed by a thin film forming method such as a sputtering method or a vapor deposition method using titanium or copper as a supply source.

JP 2010-98049 A

However, if a titanium or copper metal film is formed on the surface of the probe card wiring substrate 100 using the mullite sintered body as the insulating base 111, the temperature at which the metal film is formed becomes about 500 ° C. The thermal expansion coefficient (3-4 ppm / ° C.) of the mullite sintered body as the substrate 111 and the thermal expansion coefficient of the titanium or copper metal film (thermal expansion coefficient of the titanium metal film: 9 × 10 ⁻⁶ / ° C. , Copper: 17 × 10 ⁻⁶ / ° C.) due to thermal stress generated immediately after the surface wiring layer 113 is formed on the surface of the insulating base 111 due to the difference between the surface wiring layer 113 and the insulating base 111. There was a problem that the adhesive strength was lowered.

  Further, when the number of times the probe card is used for evaluation of the semiconductor wafer increases, the tip end portion of the probe pin 117 may be worn by contact with the inspected terminal of the semiconductor wafer, resulting in poor contact. In such a case, it is necessary to replace the probe pin 117 with a new one. However, when replacing the probe pin 117, an attempt is made to pull out the probe pin 117 from the pedestal 116 formed on the surface wiring layer 113 by applying heat or force. Then, the surface wiring layer 113 may be peeled off.

  Accordingly, the present invention has been made in view of such circumstances, and a probe card wiring board and a probe card having a surface wiring layer having a high adhesive strength with respect to an insulating base made of a mullite sintered body as an outermost layer. The purpose is to provide.

  The wiring board for a probe card of the present invention is formed by laminating a plurality of ceramic insulating layers, and at least the outermost ceramic insulating layer is an insulating base made of a mullite sintered body, and at least the outermost ceramic insulating layer is disposed inside. Surface wiring comprising a via film provided and a metal film connected to the via conductor and having a larger area than the via conductor when the insulating base is viewed in plan, and provided on the surface of the insulating base A wiring board for a probe card, wherein the via conductor is mainly composed of at least one metal of molybdenum or tungsten, and the outermost ceramic insulating layer is a first layer around the via conductor. And the second region other than the first region, and the first region has a content of alumina with respect to mullite higher than that of the second region. And wherein the door.

  The probe card wiring board of the present invention preferably has manganese titanate in the via conductor.

  The probe card of the present invention is characterized in that a probe pin for measuring electrical characteristics of a semiconductor element is connected to the surface wiring layer of the probe card wiring board.

  According to the present invention, it is possible to obtain a probe card wiring board having a surface wiring layer having a high adhesion strength to an insulating substrate whose outermost layer is made of a mullite sintered body, and a probe card using the same.

It is a schematic sectional drawing of one Embodiment of the probe card of this invention. It is a schematic sectional drawing which shows the conventional probe card.

  An embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic sectional view of an embodiment of the probe card of the present invention. In the probe card of this embodiment, a pedestal 16 is provided on a surface wiring layer 13 formed on the surface of the probe card wiring board 1, and probe pins 17 are formed on the pedestal 16.

  A probe card wiring board 1 constituting the probe card shown in FIG. 1 is formed on an insulating base 11 made of a ceramic sintered body, an internal wiring layer 12 formed inside the insulating base 11, and a surface of the insulating base 11. Via-hole conductors 14 (14a, 14b) for electrically connecting the internal wiring layers 12 within the insulating substrate 11 or between the internal wiring layers 12 and the surface wiring layer 13; have.

  The insulating base 11 is composed of a plurality of ceramic insulating layers 11a, 11b, 11c, and 11d, and each ceramic insulating layer 11a, 11b, 11c, and 11d is formed of a ceramic sintered body mainly composed of mullite. . Hereinafter, a ceramic sintered body containing mullite as a main component is referred to as a mullite sintered body.

When the ceramic insulating layers 11a to 11d constituting the insulating base 11 are mullite sintered bodies, the thermal expansion coefficient (room temperature to 300 ° C.) of the entire insulating base 11 is 3.3 to 4.3 × 10 ⁻⁶ / ° C. Can range. As a result, during the thermal load test, the positional deviation between the probe pin 17 provided on the probe card wiring board 1 and the measurement pad formed on the surface of the Si wafer is reduced, which is suitable for the inspection of electrical characteristics. It can be used.

  In the present embodiment, the ceramic insulating layers 11a, 11b, 11c, and 11d are all formed of a mullite sintered body. However, at least the outermost ceramic insulating layers 11a and 11d are mullite sintered bodies. It should just be comprised from.

  Further, the probe card ceramic wiring board 1 of the present embodiment is connected to the via conductors 14a provided in at least the outermost ceramic insulating layers 11a and 11d and the via conductors 14a, and the insulating substrate 11 is viewed in plan view. Then, a surface wiring layer 13 having a larger area than the via conductor 14a and made of a metal film provided on the surface of the outermost insulating base 11 is provided.

  Furthermore, in the probe card wiring board 1 constituting the probe card of the present embodiment, the via conductor 14 is mainly composed of at least one metal of molybdenum or tungsten.

  Further, in the probe card wiring board 1 constituting the probe card of the present embodiment, the outermost ceramic insulating layers 11a and 11d have the first regions 11A around the via conductors 14a and the first regions 11A other than the first regions 11A. And the first region 11A is characterized in that the content of alumina relative to mullite is higher than that of the second region 11B.

  That is, when the content of alumina with respect to mullite is approximately the same in the first region 11A and the second region 11B or in the second region 11B, the ceramic insulating layer 11a of the surface wiring layer 13 is increased. , 11d, and the surface wiring layer 13 may be peeled off when the probe pin 17 is pulled out from the pedestal 16 formed on the surface wiring layer 13.

  On the other hand, as shown in FIG. 1, the probe card wiring board 1 constituting the probe card of the present embodiment has a first region 11A adjacent to the via conductor 14a in the ceramic insulating layers 11a and 11d as the outermost layers. Contains more alumina than the second region 11B far from the via conductor 14a, the via conductor 14a, the first region 11A, and the second region 11B have a smaller thermal expansion coefficient in this order. Yes.

  As described above, in the probe card wiring board 1 constituting the probe card of the present embodiment, the second region 11B occupying most of the ceramic insulating layers 11a and 11b at least in the outermost ceramic insulating layers 11a and 11d. Since a sintered body having a thermal expansion coefficient in the middle range between these materials is formed as the first region 11A between the via conductors 14, the ceramic insulating layers 11a and 11d and the via conductors 14 Since the difference in thermal expansion coefficient between them can be relaxed and stress can be reduced thereby, the ceramic insulation of the surface wiring layer 13 that covers the via conductor 14a and is formed on the ceramic insulating layers 11a and 11d. The adhesive strength with respect to the layers 11a and 11d can be increased.

  Further, in the case of the probe card wiring board 1 using the mullite sintered body as described above as the insulating base 11, when the probe pin 17 is replaced, the probe pin 17 is inserted into the base 16 formed. It is also possible to reduce the defective rate of peeling of the surface wiring layer 13 that occurs when the probe pin 17 is pulled out from the pedestal 16 formed on the surface wiring layer 13 by applying heat or force to the portion.

  The range t1 of the first region 11A is desirably 22 μm or more from the side surface 14c of the via conductor 14. On the other hand, the range t1 of the first region 11A is preferably 150 μm or less from the side surface of the via conductor 14a because the thermal expansion coefficient of the insulating substrate 11 is reduced.

Here, the first region 11A is a region in which the area ratio of alumina to mullite per unit area in the cross section of the insulating base 11 is 1.5 times or more that of the second region 11B. Further, the presence of the first region 11A and the second region 11B present in a part of the periphery of the via conductor 14a is as follows:
Color mapping is performed between the via conductors 14a exposed on the outermost ceramic insulating layers 11a and 11d in the longitudinal section by polishing a longitudinal section of the insulating base 11 using a scanning electron microscope provided with an X-ray microanalyzer. Check by image analysis. At this time, the image of color mapping is divided from the side surface of the via conductor 14 at an interval of about 20 μm, and the area ratio of alumina to mullite is obtained in each divided portion, so The area (more than 5 times) is set as the first area 11A and the width (distance) is obtained. In addition, the content of alumina with respect to mullite in the first region 11A is an average value of the area ratio of alumina with respect to mullite in each portion determined to be the first region 11A. The second region 11B has an alumina area ratio in a region separated from the via conductor 14 by 1000 μm or more.

The probe card wiring board of the present embodiment desirably has manganese titanate in the via conductor 14. As a result, the adhesion strength of the surface wiring layer 13 formed so as to cover the via conductor 14 to the insulating base 11 can be further increased, and the defective rate of peeling of the surface wiring layer 13 can be further reduced. This is because manganese titanate is sintered with metal in the via conductor 14, so that the via conductor 14 is less likely to be eroded by chemicals even in chemical treatment when forming the surface wiring layer 13. This is because the strength of the conductor 14 itself can be maintained and the adhesion between the surface of the via conductor 14 and the surface wiring layer 13 formed later on the surface side of the via conductor can be enhanced. Note that the confirmation of manganese titanate contained in the via conductor 14 is also performed using an X-ray microanalyzer, as in the case of the first region 11A. In this case, a crystal phase containing about the same mole of manganese (Mn) and titanium (Ti) among crystals detected by an X-ray microanalyzer is defined as manganese titanate.

In the probe card wiring board of the present embodiment, it is desirable that the mullite sintered body constituting the insulating base 11 contains manganese (Mn) and titanium (Ti) as sintering aids. It becomes possible to sinter mullite at a low temperature of 1380 ° C. to 1420 ° C. At this time, Mn and Ti may exist in the residual glass phase present in the grain boundary phase after sintering, but exist as MnTiO ₃ from the viewpoint of improving chemical resistance and substrate strength of the probe card wiring board. It is preferable to do. For example, in the mullite sintered body in which MnTiO ₃ is precipitated at the grain boundary, the elution of the glass phase present in the mullite sintered body can be suppressed with respect to the potassium hydroxide aqueous solution. In addition, MnTiO ₃ contained in the mullite sintered body is confirmed by a method of identifying a crystal phase by X-ray diffraction.

  The internal wiring layer 12 constituting the probe card wiring board of this embodiment is composed of a composite conductor having a composition in which copper is 40 to 60% by volume and at least one of Mo and W is 40 to 60% by volume. It is desirable that

  Tungsten (W), which is a refractory metal, can be used as a material for forming the internal wiring layer 12 that can be fired simultaneously with the mullite sintered body. The internal wiring layer 12 made of tungsten (W) has a high electric resistance value. On the other hand, low resistance metals such as copper (Cu) have a melting point that is considerably lower than the firing temperature of ceramic sintered bodies containing mullite as a main component. It cannot be fired simultaneously with the body. Thus, by using the composite conductor of copper and tungsten for the internal wiring layer 12, the electrical resistance value is slightly higher than that of copper alone, but mullite is the main component at a firing temperature of 1380 ° C. to 1420 ° C. described later. Simultaneous firing with the ceramic sintered body is possible.

  However, even if simultaneous firing is possible, since firing is performed at a temperature exceeding the melting point of copper, it is necessary to suppress the melting of copper and maintain the shape of the internal wiring layer 12. Therefore, in order to achieve both low resistance and shape retention of the internal wiring layer 12, it is desirable that the ratio of the low melting point metal is 40 to 60 volume% and the high melting point metal is 40 to 60 volume%.

  Next, the manufacturing method of said probe card wiring board is demonstrated.

First, in order to form the insulating substrate 11, a mullite (3Al ₂ O ₃ · 2SiO ₂ ) powder having a purity of 99% or more and an average particle size of 0.5 to 2.5 μm is used. By making the average particle size of mullite powder 0.5 μm or more, sheet formability is improved, and by making it 2.5 μm or less, it is possible to promote densification by firing at a temperature of 1420 ° C. or less. It becomes.

Next, the mullite powder 100 wt%, _Al 2 _{O 3} powder 0-50 mass%, _Mn 2 _{O 3} powder from 1 to 10 wt%, 1-5 wt% of MgO powder, a TiO ₂ powder 1 -10 mass% is added, and mixed powder is prepared. In this case, the Al ₂ O ₃ powder used as an additive has an average particle size of 0.5 to 1.5 μm, the Mn ₂ O ₃ powder has an average particle size of 0.5 to 3 μm, and the MgO powder has an average particle size of 0.1. It is preferable to use a TiO ₂ powder having an average particle size of 0.5 to 3 μm. The purity of the Al ₂ O ₃ powder, Mn ₂ O ₃ powder, MgO powder, and TiO ₂ powder is preferably 99% by mass or more. Thereby, the sheet formability is improved, the diffusion of Mn, Mg and Ti can be improved, the sinterability at a temperature of 1380 ° C. to 1420 ° C. can be enhanced, and Al ₂ released from mullite. Mn ₃ Al ₂ Si ₃ O ₁₂ and Mg ₂ formed from O ₃ and SiO ₂ and additives Mn ₂ O ₃ and MgO
The crystallization of Al ₄ Si ₅ O ₁₈ can be enhanced.

Furthermore, the group of Ca, Sr, B, and Cr with respect to 100% by mass of mullite powder because the densification of the mullite sintered body and the simultaneous sinterability with the composite metal forming the internal wiring layer 12 are enhanced. One or more oxide powders selected from (CaO powder, SrO powder, B ₂ O ₃ powder, Cr ₂ O ₃ powder) or a powder composed of carbonate, nitrate, acetate capable of forming an oxide by firing, You may add in the ratio which does not change the thermal expansion coefficient of the wiring board for probe cards of this embodiment, and does not degrade chemical resistance.

  Next, an organic binder and a solvent are added to the mixed powder to prepare a slurry, and then a green sheet is produced by a molding method such as a press method, a doctor blade method, a rolling method, and an injection method. Alternatively, an organic binder is added to the mixed powder, and a green sheet having a predetermined thickness is produced by a method such as press molding or rolling. In addition, although the thickness of a green sheet can be 50-300 micrometers, for example, it is not specifically limited.

  Then, a through hole having a diameter of 50 to 250 μm is appropriately formed on the green sheet by a micro drill, a laser, or the like.

Next, the conductor paste is filled into the through holes of the green sheet by screen printing. The conductive paste filled in the through holes is composed of at least one metal of tungsten (W) or molybdenum (Mo) as a main component, and at least Al ₂ O ₃ powder added thereto.

By adding Al ₂ O ₃ powder to the conductor paste for the via conductor 14, the alumina in the conductor paste diffuses into the insulating substrate 11 in contact with the via conductor 14 in the firing process, and the alumina diffused portion (first The region 11A) of the mullite sintered body contains a large amount of alumina, thereby increasing the coefficient of thermal expansion of the portion of the mullite sintered body in contact with the via conductor 14 (first region 11A). Can do. This phenomenon is caused by the fact that the metal component of the via conductor 14 having a lower melting point than the Al ₂ O ₃ powder first shrinks during firing, so that the Al ₂ O ₃ powder contacts the via conductor 14 side from the ceramic insulating layers 11a to 11d side. It is because it is pushed out by the. The Al ₂ O ₃ powder is extruded to the ceramic insulating layers 11a to 11d and then sintered with the sintering aid component for forming the mullite sintered body described above. By including the sintering aid component together with the Al ₂ O ₃ powder, the immediate sinterability of the via conductor 14 can be further improved. As a sintering aid component, it is used from Mn, Ti, Mg, Si, etc., but from the standpoint of improving the sinterability more effectively and suppressing deterioration of substrate strength and chemical resistance, Mn and Ti is particularly preferably used. At this time, it is preferable to add the components of Mn, Ti, Mg, and Si as oxides of Mn ₂ O ₃ , TiO ₂ , MgO, and SiO ₂ , and the optimum addition range of each is Al ₂ O ₃ 100 mass. It is 1-5 mass% with respect to%. These powders are mixed with the composite conductor powder to prepare a conductor paste for the via conductor 14 and printed and applied by a method such as screen printing to form a raw via conductor.

  Next, with respect to the green sheet on which the raw via conductor is formed, a conductor paste prepared by adding Cu powder and W powder so that, for example, Cu is 40 to 60% by volume and W is 40 to 60% by volume. Is printed on the surface of each green sheet by a method such as screen printing or gravure printing to form a wiring pattern. In this conductive paste, alumina powder or a mixed powder of the same composition as that of the insulating base 11 may be added in addition to the above metal powder in order to improve the adhesion to the insulating base 11.

  Next, a plurality of green sheets on which raw via conductors and wiring patterns are formed are laminated to form a laminated body, and then the laminated body is placed in a non-oxidizing atmosphere (nitrogen atmosphere or a mixed atmosphere of nitrogen and hydrogen). Bake with.

  Here, as for the firing conditions, the maximum temperature is preferably 1380 ° C. to 1420 ° C., and the holding time is preferably 1 to 3 hours. By setting the maximum temperature during firing to 1380 ° C. to 1420 ° C. and holding time 1 to 3 hours, most of the alumina diffusing from the raw via conductor to the insulating base 11 side is a ceramic insulating layer around the via conductor 14. 11a-d can be stopped in a predetermined range of the region, whereby a portion containing more alumina around the via conductor 14 than the second region 11B, which is the main layer of the ceramic insulating layers 11a-d. As a result, the first region 11A can be formed. Also, the atmosphere during firing preferably contains hydrogen and nitrogen for the purpose of suppressing the diffusion of Cu in the internal wiring layer 12.

  Next, after polishing the surface of the element body of the produced probe card wiring board and removing the land pattern, the entire surface of the probe card wiring board is, for example, about 2 μm thick by sputtering. The wiring board for probe cards of this embodiment can be obtained by sequentially forming a conductive thin film of titanium and copper and then patterning the conductive thin film by photolithography.

  Next, an electrolytic plating film of nickel and gold is sequentially formed on the surface of copper on the uppermost layer of the surface wiring layer 13 to form a pedestal 16, and then a probe pin 17 made of Si is joined to the pedestal 16 to probe. Make a card.

  The probe card wiring board manufactured by the method described above has the second region other than the first region 11A and the first region 11A present in at least a part of the periphery of the via conductor 14 covered with the surface wiring layer 13. The first region 11A has a higher content of alumina with respect to mullite than the second region 11B, so that the surface wiring layer 13 has a strong adhesive strength to the insulating substrate 11. Become.

With respect to 100% by mass of mullite powder having a purity of 99% and an average particle size of 2.0 μm, Mn ₂ O ₃ powder having a purity of 99% and an average particle size of 1.5 μm is 4% by mass, and the purity is 99%. After mixing TiO ₂ powder with an average particle diameter of 2.0 μm at a ratio of 2% by mass, an acrylic binder as an organic resin for molding (organic binder) and toluene as an organic solvent are mixed to prepare a ceramic slurry. After that, it was molded into a sheet shape having a thickness of 200 μm by a doctor blade method to produce a green sheet.

The obtained green sheet was punched to form a through hole having a diameter of 200 μm. And the conductor paste for via | veer conductors which has the composition shown in Table 1 was prepared, and this conductor paste was filled in the through-hole of said green sheet by the screen printing method. The Mo powder used for the conductor paste for the via conductor has a purity of 99.9% by mass and an average particle size of 1.2 μm, and the Al ₂ O ₃ powder has a purity of 99.9% and an average particle size of 1.8 μm, As the Mn ₂ O ₃ powder and the TiO ₂ powder, the same powder as that used for the green sheet was used. The composition of the Mo powder, Al ₂ O ₃ powder, Mn ₂ O ₃ powder and TiO ₂ powder used for the conductor paste for the via conductor is the theoretical density of the compound of each powder (Mo: 10.28 g). / Cm ³ , Al ₂ O ₃ : 3.99 g / cm ³ , Mn ₂ O ₃ : 4.81 g / cm ³ , TiO ₂ : 4.93 g / cm ³ ) and converted to volume%.

  Further, land patterns to be wiring layers on the surface were formed by screen printing on the surface of the green sheet as the uppermost layer and the back surface of the green sheet as the lowermost layer, using the above-described conductor paste mainly composed of Mo.

  Further, with respect to the green sheet on which the raw via conductor is formed, Cu powder having an average particle diameter of 2 μm and W powder having an average particle diameter of 2 μm are set to 45% by volume of Cu and 55% by volume of W. The prepared conductor paste was printed on the surface of each green sheet to form an internal wiring pattern, thereby producing a green sheet on which a raw via conductor and an internal wiring pattern were formed. The green sheets thus produced were aligned and laminated and pressed to produce a laminate.

  Next, this laminate was degreased in a nitrogen-hydrogen mixed atmosphere with a dew point of + 25 ° C. at a temperature from room temperature to 600 ° C., and then fired at the maximum temperature of 1380 ° C. in the same atmosphere. A substrate was produced. The substrate size was 340 mm × 340 mm and the thickness was 5 mm.

  Next, after polishing the surface of the produced probe card wiring board and removing the land pattern, the entire surface of the probe card ceramic wiring board is electrically conductive with titanium and copper having a thickness of about 2 μm by sputtering. The thin film was formed in order.

  Next, a conductive wiring thin film of titanium and copper was patterned by photolithography to form a surface wiring layer, and a wiring board for a probe card was manufactured. The pattern area of one surface wiring layer was 1 mm × 1 mm.

  Next, the adhesion strength of the surface wiring layer to the insulating substrate was measured for the produced probe card wiring board. A sample for measurement was prepared by forming a nickel plating film on the surface wiring layer on the surface of the probe card wiring board and forming a pedestal, and then joining a 1 mm diameter Ni wire to the pedestal with silver solder. The adhesion strength was evaluated by pulling the Ni wire. At this time, an autograph was used for the tensile test. The number of samples was 10 and the average value was obtained.

  Next, a test (repair test) for replacing the Ni wire was performed using the probe card wiring board used in the tensile test. In the repair test, the silver solder joining the pedestal and the Ni wire is spot-heated using a soldering hand and the Ni wire is pulled out of the pedestal. At this time, the surface wiring layer is peeled off. The state and the broken state of the insulating substrate were confirmed visually. In the repair test, 100 probe pins were evaluated, and the ratio of the peeling of the surface wiring layer and the destruction of the porcelain portion on which the surface wiring layer was formed was determined.

  The presence of the first region and the second region existing in a part of the periphery of the via conductor and the measurement of these ranges are performed by polishing the cross section of the produced probe card wiring board and ceramic on the outermost layer in the vertical cross section. By preparing a sample with the via conductor exposed on the insulating layer, performing color mapping on the vicinity of the via conductor of the sample using a scanning electron microscope with an X-ray microanalyzer, and analyzing the obtained image went. In this case, the first region was a region in which the area ratio of alumina per unit area in the section of the ceramic insulating layer as the outermost layer of the insulating base was 1.5 times or more that of the second region. This is because the color mapping image is divided from the side surface of the via conductor at an interval of about 20 μm, the area ratio of alumina to mullite is obtained in each divided portion, and the average value of the first region is the second region with a small amount of alumina. The width (distance) of the region that is 1.5 times or more of the first region was obtained. The second region was determined from an average value obtained by measuring three areas of 100 μm × 100 μm in a region separated by 1000 μm or more from the via conductor. Note that the boundary between the first region and the second region was between regions where the area ratio of alumina to mullite per unit area was 1.5 times or more that of the second region.

  Next, a probe card was manufactured by joining a Ni-made probe pin having a diameter of 0.3 mm to the pedestal of the probe card wiring board on which a Ni-plated pedestal was formed.

  Next, the probe pin that is the measurement terminal of the probe card is brought into contact with the upper surface of the Si wafer placed on the stage and held at a temperature of 90 ° C., using a stereomicroscope from the side of the probe card, The positional deviation between the probe pin and the measurement pad formed on the surface of the Si wafer was observed. In this case, when the measurement terminal (probe pin) and the measurement pad formed on the outermost periphery of the probe card and the Si wafer are observed, the tip of the measurement terminal (probe pin) is displaced laterally from the measurement pad. Was assumed to be misaligned. None of the fabricated samples showed any misalignment.

Further, the contents of Mo, Al, Mn and Ti contained in the via conductor and the presence or absence of manganese titanate were determined by analyzing the samples used for the analysis of the first region and the second region described above with an X-ray microanalyzer. The amount of each component was determined by quantitative analysis using a scanning electron microscope provided with the symbol. At this time, the value (mass) obtained from the analysis was divided by the theoretical density of each compound and converted to volume%. For manganese titanate, the crystal phase containing about the same mole of Mn and Ti among the crystals detected by the X-ray microanalyzer was defined as manganese titanate.

Further, the composition of Cu and W of the internal wiring layer is a conductor material obtained by cutting out a portion where the internal wiring layer is formed from the probe card wiring board and dissolving the solution in an acid using ICP analysis. The contents of Cu and W were determined by mass. Next, the amounts of Cu and W obtained as masses are divided by the respective densities (copper: 8.9 g / cm ² , tungsten: 19.1 g / cm ² ) to obtain respective volumes, and then Cu and W The ratio of Cu and W when the total volume of was 100% was determined. In addition, it was confirmed that the internal wiring layer formed on the produced probe card wiring board was 45% by volume of Cu and 55% by volume of W. These results are shown in Table 1.

  As is clear from the results in Table 1, in the samples (Nos. 2 to 9) of the present invention, the bonding strength of the surface wiring layer of the probe card wiring board was 24 MPa or more. In the repair test (once), the surface wiring layer was not peeled off, and the insulating substrate in the vicinity of the surface wiring layer was not broken.

  In particular, in the sample (sample Nos. 3 to 9) that is confirmed to have manganese titanate at the center when the via conductor is viewed in cross section, the bonding strength of the surface wiring layer of the probe card wiring board is low. 27 MPa or more, the rate of peeling of the surface wiring layer in the repair test (three times) is 3.0% or less, and the breakdown of the insulating substrate near the surface wiring layer is 1.1% or less, It was confirmed that the wiring board for probe cards was formed with a strong surface wiring layer.

  On the other hand, the samples (sample Nos. 1 and 10) outside the scope of the present invention have a bonding strength of the surface wiring layer of the probe card wiring board of 17 MPa, and the surface wiring layer in the repair test (one time). The peeling was 3.0%, and the destruction of the insulating substrate in the vicinity of the surface wiring layer was 1.0%.

DESCRIPTION OF SYMBOLS 1,100: Probe card wiring board 11, 111: Insulation base 12, 112: Internal wiring layer 13, 113: Surface wiring layers 14, 14a, 14b, 114: Via-hole conductor 16, 116: Base 17, 117: Probe pin

Claims (3)

A plurality of ceramic insulating layers are laminated, and at least the outermost ceramic insulating layer is an insulating base made of a mullite sintered body, at least a via conductor provided inside the outermost ceramic insulating layer, and the via conductor And a surface wiring layer made of a metal film having a larger area than the via conductor and provided on the surface of the insulating base when the insulating base is viewed in plan. A wiring board,
The via conductor is mainly composed of at least one metal of molybdenum or tungsten, and the outermost ceramic insulating layer includes a first region around the via conductor and a second region other than the first region. The probe card wiring board is characterized in that the first region has a content of alumina with respect to mullite higher than that of the second region.   The probe card wiring board according to claim 1, wherein the via conductor has manganese titanate.   A probe card for connecting a probe pin for measuring electrical characteristics of a semiconductor element to the surface wiring layer of the wiring board for a probe card according to claim 1 or 2.

Images