JP2022031017A - Resistor and method for manufacturing resistor - Google Patents

Abstract

To provide a resistor that does not contain a lead component, in which the absolute value of a resistance temperature coefficient is 100 ppm/K or less.SOLUTION: There is provided a resistor that does not contain a lead component, and has a first resistor that has a negative resistance temperature coefficient and a second resistor that has a positive resistance temperature coefficient, wherein the first resistor and the second resistor are arranged in series, the first resistor is a multilayer film in which an insulating film is laminated on an electroconductive thin film, the second resistor is a thin film including RuO2, and the mixing ratio that is the ratio of the resistance value of the first resistor to the resistance value of the resistor is within a range where the absolute value of the resistance temperature coefficient of the resistor is 100 ppm or less.SELECTED DRAWING: Figure 2

Description

The present invention relates to a resistor and a method for manufacturing the resistor.

As a method for forming a resistor, a thick film method using a resistance paste and a thin film method for forming a film forming material by a sputtering method are often used conventionally.

The thick film method is a method in which a resistor paste is printed on a ceramic substrate and fired to form a resistor. Since the equipment is inexpensive and the productivity is high, resistors such as chip resistors and hybrid ICs are manufactured. Widely used in.

The resistance paste used in the thick film method generally contains a solid component including conductive particles and glass frit, and an organic vehicle for forming the solid component into a paste suitable for printing.

As the conductive particles, ruthenium dioxide (RuO ₂ ) and pyrochlore-type ruthenium oxides (Pb ₂ Ru ₂ O _7-X , Bi ₂ Ru ₂ O ₇ ) are generally used.

As the glass frit, lead glass containing a large amount of lead such as lead borosilicate glass (PbO-SiO ₂ -B ₂ O ₃ ) and lead alumino borosilicate glass (PbO-SiO ₂ -B ₂ O ₃ -Al ₂ O ₃ ) Lead acid acid glass is used.

As described above, the conventional resistor may contain lead in order to have good electrical characteristics. However, in recent years, there has been a demand for the elimination of the use of lead in electronic devices. Therefore, the resistor is also required not to use lead, but at the same time, it is also required to have good electrical characteristics.

For example, Patent Document 1 discloses a paste for forming a thick film resistor using iridium oxide (IrO ₂ ) powder, and a thick film resistor using the paste. The thick film resistor paste disclosed in Patent Document 1 is useful as, for example, a thick film resistor paste in a high resistance region, but iridium is expensive, and is particularly conductive when applied to general-purpose resistor components. There is a cost issue in replacing things.

Therefore, it is being considered to produce a lead-free resistor by using a thin film method instead of a thick film method.

Patent Document 2 is composed of two or more thin films of metal having different magnitudes of temperature coefficient of resistance, and each thin film has a positive and negative temperature coefficient of resistance, and the film thickness of the thin film and the film thickness ratio of each. Disclosed is a thin film resistor characterized by having a predetermined resistance value and a small temperature coefficient of resistance by being controlled.

However, in order to make the absolute value of the temperature coefficient of resistance about 100 ppm or less, it is necessary to make the resistance values of the positive and negative resistors the same. Therefore, the configuration of the thin film resistor disclosed in Patent Document 2 has a problem because the resistance value is restricted to a narrow range.

Japanese Unexamined Patent Publication No. 2007-277040 Special Publication No. 50-25149

As described above, it has been difficult to generally use the lead-free resistors studied so far because of the cost and the narrow range of resistance values of the obtained resistors. Therefore, there has been a demand for a new resistor that does not contain a lead component and has a suppressed temperature coefficient of resistance.

In view of the above problems of the prior art, one aspect of the present invention is to provide a resistor that does not contain a lead component and has an absolute temperature coefficient of resistance of 100 ppm / K or less.

In order to solve the above problems, the present invention
It is a resistor that does not contain lead components.
A first resistor with a negative temperature coefficient of resistance,
With a second resistor having a positive temperature coefficient of resistance,
The first resistor and the second resistor are arranged in series,
The first resistor is a multilayer film in which an electrically conductive thin film and an insulator film are laminated.
The second resistor is a thin film containing RuO ₂ and is a thin film.
Provided is a resistor in which the mixing ratio, which is the ratio of the resistance value of the first resistor to the resistance value of the resistor, is within the range in which the absolute value of the temperature coefficient of resistance of the resistor is 100 ppm or less.

According to one aspect of the present invention, it is possible to provide a resistor that does not contain a lead component and has an absolute value of the temperature coefficient of resistance of 100 ppm / K or less.

It is a top view of the resistor which concerns on one aspect of this disclosure. It is sectional drawing which is taken along the line AA'in FIG. It is explanatory drawing of the temperature dependence of the resistance value when the mixing ratio of a 1st resistor and a 2nd resistor is changed. It is explanatory drawing of the sputtering apparatus which forms a film of a multilayer film.

Hereinafter, an embodiment of the resistor of the present invention and a method for manufacturing the resistor will be described.
[Resistance]
The inventor of the present invention has diligently studied a new resistor containing no lead component.

The inventor of the present invention can form a conductive thin film having a negative temperature coefficient of resistance, that is, an electrically conductive thin film (a thin film having electrical conductivity) by a physical film forming method, and prepare a laminated structure. I focused on how easy it is to do. It was also found that the first resistor in which the electrically conductive thin film and the insulator film are alternately laminated has a negative temperature coefficient of resistance, and the resistance value can be controlled by selecting the number of layers. rice field.

Further, by forming a resistor in which the first resistor having the above negative temperature coefficient of resistance and the second resistor which is a conductive resistor having a positive temperature coefficient of resistance are combined, the resistance temperature of the entire resistor is increased. It has been found that the coefficient can be controlled and the absolute value of the temperature coefficient of resistance can be set to 100 ppm / K or less.

That is, a multilayer film in which an electrically conductive thin film and an insulator film are laminated is used as the first resistor, and the resistance value of the entire resistor is controlled by selecting, for example, the number of layers, and the range of resistance values that can be selected. Can be a wide resistor. Then, by using a resistor having a first resistor having a negative temperature coefficient of resistance and a second resistor having a positive temperature coefficient of resistance, the absolute value of the temperature coefficient of resistance of the resistor is 100 ppm / K or less. Can be done.

A configuration example of the resistor of this embodiment is shown in FIGS. 1 and 2. FIG. 1 is a top view of the resistor 10 of the present embodiment. FIG. 2 shows an electrically conductive thin film 111A and an insulator film 111B that pass through the first resistor 11 and the second resistor 12 of the resistor 10 of the present embodiment and constitute the first resistor. The cross-sectional view in the plane parallel to the stacking direction is shown. FIG. 2 corresponds to a cross-sectional view taken along the line AA'of FIG.

The resistor of this embodiment does not contain a lead component. Then, as shown in FIGS. 1 and 2, the resistor 10 of the present embodiment includes a first resistor 11 having a negative temperature coefficient of resistance and a second resistor 12 having a positive temperature coefficient of resistance. However, the first resistor 11 and the second resistor can be arranged in series.

The first resistor 11 has a multilayer film 111 in which an electrically conductive thin film 111A and an insulator film 111B are laminated.

The second resistor 12 is a thin film containing RuO ₂ (ruthenium oxide).

The mixing ratio, which is the ratio of the resistance value of the first resistor 11 to the resistance value of the resistor 10, can be set within the range in which the absolute value of the temperature coefficient of resistance of the resistor 10 is 100 ppm or less.

Hereinafter, each member will be described.
(1) First resistor The first resistor is a resistor having a negative temperature coefficient of resistance. As shown in FIG. 2, it is possible to have a multilayer film 111 (laminated film) in which an electrically conductive thin film 111A and an insulator film 111B are alternately laminated.

The multilayer film 111 may be arranged between the electrodes 112 as shown in FIGS. 1 and 2 so as to be easily electrically connected to the second resistor 12 described later and other members. The material of the electrode 112 is not particularly limited, but the electrode 112 may have, for example, highly conductive Al (aluminum), Au (gold), Ag (silver), Cu (copper), Pd (palladium), Sn (tin), and It can contain one or more types selected from Pt (platinum) and the like.

The material of the electrically conductive thin film 111A of the multilayer film 111 is not particularly limited, but is composed of, for example, Au (gold), Pt (platinum), Ag (silver), Al (aluminum), and Cu (copper). It can contain one or more metals selected from the metal group. When the material of the electrically conductive thin film 111A contains Ag, it may be, for example, an Ag—Mn (manganese) alloy or the like. From the viewpoint of stabilizing the resistance value of the resistor 10, the material of the electrically conductive thin film 111A preferably contains a noble metal such as Au or Pt, which hardly oxidizes even in an oxygen atmosphere, and is composed of a noble metal such as Au or Pt. It is more preferable to be done.

The material of the insulator film 111B included in the multilayer film 111 is also not particularly limited. The insulator film 111B is an oxide or a nitride containing one or more selected from a group of elements such as Si (silicon), Ta (tantalum), Zr (zirconium), Nb (niobium), and Al (aluminum). Can be used. Among them, SiO ₂ which is an oxide of Si and Al ₂ O ₃ which is an oxide of Al can easily produce a high resistor, and therefore can be particularly preferably used as a material for the insulator film 111B. As the nitride, for example, an amorphous silicon nitride film (SiN _x ) or aluminum nitride (AlN) can be used.

Since the resistor 10 of the present embodiment does not contain a lead component, the first resistor 11 also does not contain a lead component. Here, the fact that the resistor 10 and the first resistor 11 do not contain the lead component means that the lead component is not intentionally added, and the lead component is the first resistance as an unavoidable component in the manufacturing process or the like. It does not preclude contamination with the body 11.

The thickness of each layer is not particularly limited, but for example, the film thickness of the electrically conductive thin film 111A can be, for example, 1 nm or more and 100 nm or less.

By setting the film thickness of the electrically conductive thin film 111A to 1 nm or more, it is possible to stably exhibit electrical conductivity and improve reproducibility. Further, by setting the film thickness of the electrically conductive thin film 111A to 100 nm or less, the multilayer film 111 can be more reliably formed into a film having a negative temperature coefficient of resistance. The film thickness of the electrically conductive thin film 111A is more preferably 1 nm or more and 50 nm or less.

When manufacturing the multilayer film 111, the electrically conductive thin film 111A and the insulator film 111B may be alternately laminated and then annealed. When such an annealing treatment is performed, the electrically conductive thin film 111A reacts in the vicinity of the interface with the insulator film 111B, and the film thickness of the electrically conductive thin film 111A may differ depending on the location. Therefore, the film thickness of the electrically conductive thin film 111A does not have to be constant, and may be within the above range when the measurement is performed at an arbitrary place.

The film thickness of the electrically conductive thin film 111A is determined by Auger electron spectroscopy or XPS (X-ray) for the cross section of the plane parallel to the stacking direction of the electrically conductive thin film 111A and the insulator film 111B for the multilayer film 111. It is obtained by analyzing by photoelectron spectroscopy (X-ray photoelectron spectroscopy) or the like and evaluating the thickness in the range in which the elements constituting the electrically conductive thin film 111A are distributed.

The film thickness of the insulator film 111B is preferably 100 nm or more and 1000 nm or less. Insulation can be improved by setting the film thickness of the insulator film 111B to 100 nm or more. Further, by setting the film thickness of the insulator film 111B to 1000 nm or less, it is possible to suppress the increase in unevenness on the surface of the insulator film 111B. The film thickness of the insulator film 111B can also be evaluated by the same method as in the case of the film thickness of the electrically conductive thin film 111A.

FIG. 2 schematically shows an example in which five layers of the electrically conductive thin film 111A and four layers of the insulator film 111B are laminated, but the number of layers of the electrically conductive thin film 111A and the insulator film 111B is shown. Not particularly limited.

When the resistance value of the electrically conductive thin film 111A is R111A and the first resistor 11 has n layers of the electrically conductive thin film 111A, the resistance value R1 of the first resistor 11 can be expressed as R1 = R111A ÷ n. ..

Therefore, the number of layers of the electrically conductive thin film 111A and the insulator film 111B can be selected according to the resistance value required for the resistor 10 and the resistance value of the second resistor 12 to be combined.
(2) Second resistor The second resistor 12 is a thin film containing RuO ₂ .

The second resistor 12 can be composed of only RuO ₂ , but even in this case, it does not exclude the inclusion of unavoidable impurities mixed in the manufacturing process.

Further, since the resistor 10 of the present embodiment does not contain a lead component, the second resistor 12 also does not contain a lead component. Here, the fact that the second resistor 12 does not contain the lead component means that the lead component is not intentionally added, and the lead component is mixed in the second resistor 12 as an unavoidable component in the manufacturing process or the like. It does not exclude that.

By adjusting the thickness T, the length L, and the width W of the second resistor 12, the resistance value and the mixing ratio described later can be adjusted.
(3) Substrate The resistor 10 of the present embodiment can be formed on the substrate 13 as shown in FIGS. 1 and 2. The material of the substrate 13 is not particularly limited as long as the surface forming the resistor 10 is flat. Examples of the material of the substrate 13 include Si (silicon) having good flatness, quartz and the like.

When the substrate 13 has conductivity, an insulator film 131 such as SiO ₂ can be arranged on the surface forming the resistor 10 in order to avoid the influence of the substrate 13.

For the resistor of the present embodiment, the mixing ratio of the first resistor and the second resistor is selected so that the desired resistance value is obtained and the absolute value of the temperature coefficient of resistance is 100 ppm / K or less. can.
(4) The temperature coefficient of resistance of the resistor and the mixing ratio of the first resistor and the second resistor (4-1) Temperature coefficient of resistance The resistance temperature coefficient of the resistor will be described.

The temperature coefficient of resistance is the temperature change rate of the resistance value obtained by the resistance value at 220K or 420K with respect to the resistance value of 300K, and is obtained by the following equations (A) and (B), respectively.

Cold-TCR (ppm / K) = (R ₂₂₀ -R ₃₀₀ ) / R ₃₀₀ / (-80) × 10 ⁶ ... (A)
Hot-TCR (ppm / K) = (R ₄₂₀ -R ₃₀₀ ) / R ₃₀₀ / (120) × 10 ⁶ ... (B)
The temperature coefficient of resistance obtained from the resistance values of 300K and 220K is called the low temperature side TCR (Cold-TCR). In addition, TCR means Temperature Coefficient of response.

The temperature coefficient of resistance obtained from the resistance values of 300K and 420K is called the high temperature side TCR (Hot-TCR).

The resistor of the present embodiment preferably has a resistance temperature coefficient, that is, an absolute value of the low temperature side TCR and the high temperature side TCR of 100 ppm / K or less.

Therefore, in the resistor of the present embodiment, the mixing ratio of the first resistor and the second resistor can be selected so that the absolute value of the temperature coefficient of resistance is 100 ppm / K or less.
(4-2) Mixing ratio of the first resistor and the second resistor The mixing ratio of the first resistor and the second resistor is the resistance value of the first resistor among the resistance values of the resistors. It means the ratio to occupy, that is, the ratio to contribute.

When the resistance value of the resistor is R, the resistance value of the first resistor is R1, and the resistance value of the second resistor is R2, the first resistor and the second resistor are arranged in series. There is a relationship of R = R1 + R2. Then, when the mixing ratio of the first resistor and the second resistor is r, R1 = r × R and R2 = (1-r) × R.

In the resistor of the present embodiment, the mixing ratio r, which is the ratio of the resistance value of the first resistor to the resistance value of the resistor, is within the range in which the absolute value of the temperature coefficient of resistance of the resistor is 100 ppm or less. Is preferable. That is, the mixing ratio r is preferably selected so that the absolute value of the temperature coefficient of resistance of the resistor is 100 ppm or less. The total of the resistance value of the first resistor and the resistance value of the second resistor is the resistance value of the resistor as described above.

The following is an example of the change in the temperature coefficient of resistance when the mixing ratio between the first resistor and the second resistor (hereinafter, also simply referred to as “mixing ratio”) is changed.

FIG. 3 shows the temperature dependence of the resistance value of a resistor having the same configuration as that of Example 1 described later, when the mixing ratio is changed.

In the example shown in FIG. 3, the first resistor has five layers of an Au film having a thickness of 1 nm, which is an electrically conductive thin film, and a SiO ₂ film having a thickness of 100 nm, which is an insulator film, respectively. It is a laminated multilayer film. The second resistor is a RuO ₂ film having a thickness T of 1 μm and a width W of 100 μm. In FIG. 3, the dotted line 31 shows the temperature dependence of the resistance value of the first resistor, and the dotted line 32 shows the temperature dependence of the resistance value of the second resistor.

Then, the temperature dependence of the resistance value of the resistor when the mixing ratio is 0.7 is the line segment 331, and the temperature dependence of the resistance value of the resistor when the mixing ratio is 0.75 is the line segment 332, the mixing ratio. The temperature dependence of the resistance value of the resistor when is 0.8 is shown in line segment 333. The temperature dependence of the resistance value of the resistor when the mixing ratio is 0.85 is shown on the line segment 334, and the temperature dependence of the resistance value of the resistor when the mixing ratio is 0.9 is shown on the line segment 335.

Table 1 shows the temperature coefficient of resistance of the resistor when the mixing ratio is changed.

なお、第２抵抗体であるＲｕＯ_２膜の比抵抗は１２０μΩｍなので、例えば厚さＴが１μｍ、長さＬが４ｍｍの場合、幅Ｗを１～１００μｍの範囲で変化させると、抵抗値は以下の表２に示すように４８０００Ωから４８０Ωの範囲で変化する。このため、幅Ｗを変化させることで第２抵抗体の抵抗値を変化させ、上記混合率を変化させている。

Since the specific resistance of the RuO ₂ film, which is the second resistor, is 120 μΩm, for example, when the thickness T is 1 μm and the length L is 4 mm, if the width W is changed in the range of 1 to 100 μm, the resistance value is as follows. As shown in Table 2 of the above, it varies in the range of 48000Ω to 480Ω. Therefore, the resistance value of the second resistor is changed by changing the width W, and the mixing ratio is changed.

表１に示した構成例の場合、混合率が０．７９以上０．８２以下の場合に抵抗温度係数の絶対値が１００ｐｐｍ以下になることを確認できる。すなわち、第１抵抗体１１の電気伝導性の薄膜がＡｕ膜、絶縁体膜がＳｉＯ_２であり、第２抵抗体がＲｕＯ_２膜の場合、混合率は０．７９以上０．８２以下であることが好ましいことを確認できる。

In the case of the configuration example shown in Table 1, it can be confirmed that the absolute value of the temperature coefficient of resistance is 100 ppm or less when the mixing ratio is 0.79 or more and 0.82 or less. That is, when the electrically conductive thin film of the first resistor 11 is an Au film, the insulator film is SiO ₂ , and the second resistor is a RuO ₂ film, the mixing ratio is 0.79 or more and 0.82 or less. Can be confirmed that is preferable.

Here, the case where the first resistor and the second resistor having the above configuration are used has been described as an example, but since the range of the suitable mixing ratio can be changed by changing the configuration of each resistor, the above description is made. It is not limited to the range.

As described above, an appropriate mixing ratio can be selected by measuring the temperature dependence of the first resistor and the second resistor of the resistor to be manufactured in advance and calculating the change in the temperature coefficient of resistance depending on the mixing ratio. ..
[Manufacturing method of resistor]
The method of manufacturing the resistor of this embodiment will be described. According to the method for manufacturing a resistor of the present embodiment, the above-mentioned resistor can be manufactured. Therefore, some of the matters already explained will be omitted.

The method for producing a resistor of the present embodiment may include the following first resistor forming step and second resistor forming step with respect to the method for manufacturing a resistor containing no lead component.

A first resistor forming step of forming a first resistor having a negative temperature coefficient of resistance.

A second resistance forming step of forming a second resistance having a positive temperature coefficient of resistance.

In the first resistor forming step and the second resistor forming step, the first resistor and the second resistor can be formed so that the first resistor and the second resistor are arranged in series.

Further, the mixing ratio, which is the ratio of the resistance value of the first resistor to the resistance value of the resistor, can be set within the range in which the absolute value of the temperature coefficient of resistance of the resistor is 100 ppm or less. That is, in the first resistor forming step and the second resistor forming step, the absolute value of the resistance temperature coefficient of the resistor is the mixing ratio, which is the ratio of the resistance value of the first resistor to the resistance value of the resistor. The first resistor and the second resistor can be formed so as to be 100 ppm or less.

The order in which the first resistor forming step and the second resistor forming step are carried out is not particularly limited, and the first resistor forming step and the second resistor forming step may be carried out in that order. .. Further, it is also possible to carry out the first resistor forming step after carrying out the second resistor forming step.

Each process will be described below.
(First resistor forming step)
In the first resistor forming step, the electrically conductive thin film and the insulator film can be alternately laminated by a sputtering method.

For example, as shown in FIG. 4, a first target 42 for forming an electrically conductive thin film and a second target 43 for forming an insulator film are arranged in a chamber 41 of the sputtering apparatus 40. Further, the substrate 13 forming the resistor 10 is held in the substrate fixing portion 441 of the substrate holder 44, and the substrate holder 44 is configured to be rotatable by the rotating shaft 442 connected to the substrate fixing portion 441. The first target 42 and the second target 43 are arranged so that the surfaces forming the resistor 10 of the substrate 13 face each other.

Then, while rotating the rotation shaft 442 of the board holder 44 along the block arrow B, power is supplied from the first power supply 421 connected to the first target 42 and the second power supply 431 connected to the second target 43. , Spatter. As a result, the electrically conductive thin film and the insulator film can be alternately laminated on the substrate 13.

By adjusting the film forming speed and the speed at which the substrate holder 44 is rotated, a laminated film having a desired thickness can be formed. For example, the film formation rate can be changed by selecting the number of each target, the position of the target, the size of the target, and the distance between the target and the substrate.

The thickness of the electrically conductive thin film and the insulator film is not particularly limited, but as described above, the film thickness of the electrically conductive thin film 111A is preferably 1 nm or more and 100 nm or less, and is preferably 1 nm or more. It is more preferably 50 nm or less.

The film thickness of the insulator film 111B is preferably 100 nm or more and 1000 nm or less.
(Second resistor forming step)
The second resistor is a thin film containing RuO ₂ as described above. The method for forming the second resistor in the second resistor forming step is not particularly limited, and a thin film can be formed by, for example, a sputtering method, a CVD method (chemical vapor deposition method), or a sol-gel method.

The method for producing a resistor according to the present embodiment may further include an arbitrary step in addition to the first resistor forming step and the second resistor forming step.

The method for manufacturing a resistor according to the present embodiment is, for example, in order to make the first resistor and the second resistor into a desired shape and size after performing the first resistor forming step and the second resistor forming step. It is also possible to have an etching step of etching the first resistor and the second resistor. The etching step may be carried out after each of the first resistor forming step and the second resistor forming step, or may be carried out after both steps are completed.

Further, the method for manufacturing a resistor according to the present embodiment may include a masking step of masking so that the first resistor and the second resistor are not formed outside the predetermined region. The masking step can be performed, for example, before the first resistor forming step and before the second resistor forming step.

The method for producing a resistor of the present embodiment may further include an annealing step of performing an annealing treatment. By performing the annealing treatment, the electrical characteristics of the obtained resistor can be stabilized. The conditions of the annealing treatment are not particularly limited, but for example, annealing can be performed at 300 ° C. or higher and 500 ° C. or lower for 1 hour or longer and 5 hours or shorter in an oxygen-containing atmosphere. The oxygen-containing atmosphere preferably contains oxygen in a proportion of 18% by volume or more and 100% by volume or less.

Since the annealing treatment is preferably performed on at least the first resistor, the annealing treatment step is preferably performed after the first resistor forming step. The annealing treatment step may be carried out after the completion of the first resistor forming step and the second resistor forming step.

Specific examples and comparative examples will be described below, but the present invention is not limited to these examples.
[Example 1]
A resistor was manufactured and evaluated by the following procedure.
(First resistor forming step)
A multilayer film of the first resistor was formed by using a sputtering apparatus having the same structure as the sputtering apparatus 40 shown in FIG.

Specifically, it was carried out under the condition of 0.5 Pa in a gas containing Ar and oxygen using a sputtering apparatus (model: SIH-450) manufactured by ULVAC, Inc. During the film formation, the flow rate ratio of Ar and oxygen (O ₂ ) was controlled to be in the range of Ar: O ₂ = 9: 1 to 2: 1. The initial flow rate ratio in this embodiment is 5.6: 1. The ultimate vacuum in the chamber 41 before sputtering was 1.5 × 10 ^-4 Pa, and the gas pressure of Ar + O ₂ gas during sputtering was 0.5 Pa.

As the first target 42, a Si target to which P (phosphorus) was added to impart conductivity was used, and the thickness was 6 inches and 5 mm. In the sputtering apparatus used, three targets could be installed, and the first target 42 was attached to each of the two cathodes.

An Au target was used as the second target 43, and it had a disk shape of 6 inches and a thickness of 0.5 mm. The second target 43 was used by bonding it to a copper backing plate with In (indium).

The distance L ₄₂ between the first target 42 and the substrate 13 forming the resistor was set to 40 mm. Further, the distance L ₄₃ between the second target 43 and the substrate 13 was set to 80 mm.

The substrate 13 was fixed to the substrate holder 44. The substrate holder 44 was rotated 120 degrees and step-rotated so as to repeat the static film formation. The DC power to be applied was 50 W for the second target 43 and 800 W for the first target 42. As a result, the film thickness was adjusted so that the film thickness of the SiO ₂ layer, which is an insulator film, was 100 nm and the film thickness of the Au layer, which was an electrically conductive thin film, was 1 nm.

In the first resistor forming step, five layers of an insulator film and an electrically conductive thin film were formed. After the film formation, the multilayer film was formed by a photolithography method so that the size of the multilayer film was 1 mm in width and 10 mm in length (etching step). An electrode 112 was formed on the obtained multilayer film with a conductive paste containing Ag. The resistance value of the obtained multilayer film at room temperature was 2023Ω.
(Second resistor forming step)
The second resistor was formed by the sputtering method so as to be arranged in series with the first resistor. A RuO ₂ film was formed as the second resistor.

The second resistor 12 is formed so that the thickness T is 1 μm and the width W is 100 μm, and the mixing ratio of the first resistor 11 and the second resistor 12 is 0.8, that is, the second resistance. The length L was adjusted so that the resistance value of the body at room temperature was 505Ω.

The length L of the second resistor 12 was adjusted to 4.2 mm by forming a mask on the second resistor 12 and applying Ag paste to form the electrode 141. Further, the electrode 142 was also formed on the electrode 112 of the first resistor 11 by Ag paste.

The resistance value of the obtained resistor 10 at room temperature was 2530 Ω. Further, when the temperature coefficient of resistance of the obtained resistor was determined, the Cold-TCR was −43 ppm and the Hot-TCR was 83 ppm.

The evaluation results are summarized in Table 3.

For the temperature coefficient of resistance, the prepared resistors were held at 220K, 300K, and 420K for 15 minutes, and then the resistance values were measured, and the resistance values at each temperature were set to R ₂₂₀ , R ₃₀₀ , and R ₄₂₀ . Then, the Cold-TCR and the Hot-TCR were calculated by the following equations (A) and (B).
Cold-TCR (ppm / ° C) = (R ₂₂₀ -R ₃₀₀ ) / R ₃₀₀ / (-80) × 10 ⁶ ... (A)
Hot-TCR (ppm / ° C) = (R ₄₂₀ -R ₃₀₀ ) / R ₃₀₀ / (120) × 10 ⁶ ... (B)
The resistance value is set in a metal container equipped with a temperature control stage (model number: HCS302-mK2000 manufactured by Toyo Technica Co., Ltd.) that can control the temperature in the range of -140 ° C to 400 ° C. After replacement with nitrogen gas, the measurement was performed with a digital multimeter (model number: DMM7510 manufactured by KEITHLEY).

The resistance values R ₂₂₀ , R ₃₀₀ , and R ₄₂₀ were calculated by measuring 25 resistors manufactured under the same conditions and averaging the measurement results for 25 resistors. In the other experimental examples below, the resistance value was measured in the same manner, and the temperature coefficient of resistance was calculated.
[Example 2]
In the first resistor forming step, 50 layers of an insulator film and 50 layers of an electrically conductive thin film were formed. Except for the above points, a resistor was manufactured and evaluated in the same manner as in Example 1. The mixing ratio of the first resistor 11 and the second resistor 12 was set to 0.8 as in Example 1.

The resistance value of the obtained resistor at room temperature was 503Ω. Further, when the temperature coefficient of resistance of the obtained resistor was determined, the Cold-TCR was -40 ppm / K and the Hot-TCR was 82 ppm / K.

The evaluation results are summarized in Table 3.
[Example 3]
In the first resistor forming step, one layer of an insulator film and one layer of an electrically conductive thin film were formed. Further, the length L of the second resistor was adjusted so that the mixing ratio of the first resistor 11 and the second resistor 12 was 0.82. Except for the above points, a resistor was manufactured and evaluated in the same manner as in Example 1.

The resistance value of the obtained resistor at room temperature was 25005Ω. Further, when the temperature coefficient of resistance of the obtained resistor was determined, the Cold-TCR was −81 ppm / K and the Hot-TCR was 50 ppm / K.

The evaluation results are summarized in Table 3.
[Comparative Example 1]
The length L of the second resistor was adjusted so that the mixing ratio of the first resistor 11 and the second resistor 12 was 0.85. Except for the above points, a resistor was manufactured and evaluated in the same manner as in Example 1.

The resistance value of the obtained resistor at room temperature was 2400Ω. Further, when the temperature coefficient of resistance of the obtained resistor was determined, the Cold-TCR was -145 ppm / K and the Hot-TCR was -2 ppm / K.

The evaluation results are summarized in Table 3.
[Comparative Example 2]
The length L of the second resistor was adjusted so that the mixing ratio of the first resistor 11 and the second resistor 12 was 0.75. Except for the above points, a resistor was manufactured and evaluated in the same manner as in Example 1.

The resistance value of the obtained resistor at room temperature was 2700 Ω. The temperature coefficient of resistance of the obtained resistor was found to be 47 ppm / K for Cold-TCR and 159 ppm / K for Hot-TCR.

The evaluation results are summarized in Table 3.

表３に示したように、実施例１～３においては抵抗値が５０３Ω～２５００５Ωと広く、抵抗温度係数の絶対値が１００ｐｐｍ／Ｋ以下の抵抗体が得られることを確認できた。

As shown in Table 3, it was confirmed that in Examples 1 to 3, a resistor having a wide resistance value of 503Ω to 25005Ω and an absolute value of the temperature coefficient of resistance of 100 ppm / K or less can be obtained.

10 Resistor 11 First resistor 111 Multilayer film 111A Electrically conductive thin film 111B Insulator film 12 Second resistor

Claims (4)

It is a resistor that does not contain lead components.
A first resistor with a negative temperature coefficient of resistance,
With a second resistor having a positive temperature coefficient of resistance,
The first resistor and the second resistor are arranged in series,
The first resistor is a multilayer film in which an electrically conductive thin film and an insulator film are laminated.
The second resistor is a thin film containing RuO ₂ and is a thin film.
A resistor whose mixing ratio, which is the ratio of the resistance value of the first resistor to the resistance value of the resistor, is within the range in which the absolute value of the temperature coefficient of resistance of the resistor is 100 ppm or less. The resistor according to claim 1, wherein the electrically conductive thin film has a film thickness of 1 nm or more and 100 nm or less. A method for manufacturing a resistor that does not contain a lead component.
A first resistor forming step of forming a first resistor having a negative temperature coefficient of resistance,
It has a second resistance forming step of forming a second resistance having a positive temperature coefficient of resistance.
In the first resistor forming step and the second resistor forming step, the first resistor and the second resistor are arranged so that the first resistor and the second resistor are arranged in series. Form and
In the first resistor forming step, the electrically conductive thin film and the insulator film are laminated by a sputtering method.
The second resistor is a thin film containing RuO ₂ , and in the second resistor forming step, the thin film is formed by any of a sputtering method, a CVD method, and a sol-gel method.
A method for producing a resistor in which the mixing ratio, which is the ratio of the resistance value of the first resistor to the resistance value of the resistor, is within the range in which the temperature coefficient of resistance of the resistor is 100 ppm or less. The method for producing a resistor according to claim 3, wherein in the first resistor forming step, the electrically conductive thin film is formed so that the film thickness is 1 nm or more and 100 nm or less.

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