JP3435369B2 - Semiconductor devices - Google Patents

Semiconductor devices

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Publication number
JP3435369B2
JP3435369B2 JP18106899A JP18106899A JP3435369B2 JP 3435369 B2 JP3435369 B2 JP 3435369B2 JP 18106899 A JP18106899 A JP 18106899A JP 18106899 A JP18106899 A JP 18106899A JP 3435369 B2 JP3435369 B2 JP 3435369B2
Authority
JP
Japan
Prior art keywords
metal film
metal
fixing
medium
glass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP18106899A
Other languages
Japanese (ja)
Other versions
JP2001013022A (en
Inventor
政之 三木
義幸 笹田
正則 久保田
範男 市川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Hitachi Automotive Systems Engineering Co Ltd
Original Assignee
Hitachi Ltd
Hitachi Car Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd, Hitachi Car Engineering Co Ltd filed Critical Hitachi Ltd
Priority to JP18106899A priority Critical patent/JP3435369B2/en
Publication of JP2001013022A publication Critical patent/JP2001013022A/en
Application granted granted Critical
Publication of JP3435369B2 publication Critical patent/JP3435369B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Measuring Fluid Pressure (AREA)
  • Pressure Sensors (AREA)

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は半導体デバイスに係
わり、特に自動車のエンジン制御などに用いられる気体
やオイル,ガソリンなど被測定媒体中の腐食成分よりデ
バイス構成部品を保護し、信頼性の向上,実装構造の簡
単化を図るに好適な圧力センサなどの半導体デバイスに
関する。 【0002】 【従来の技術】本発明に係わる従来技術として、図2に
示す特開平10−281908号が開示されている。図におい
て、1はシリコンからなる感圧チップ、2はガラス台
座、3は金属の固定台、4はガラス台座2に形成された
金属膜、5はガラス台座2と金属の固定台を接合する軟
ろうで半導体式圧力センサを構成する。本発明は、ガラ
ス台2の金属膜の形成を外周部を除いた部分に行い、固
定台3に接合した時のガラス台2へのストレスを緩和す
るものである。しかし、圧力の被測定媒体中には、セン
サの構成部品を腐食させる、例えば、酸性分を含む物が
あり、この対策が必要である。特に、金属膜4,軟ろう
材5は直接被測定媒体に接触するため、信頼性を確保す
る上で耐食性が要求される。本件ではこの問題,対策に
対し何ら開示されていない。 【0003】 【発明が解決しようとする課題】本発明の目的は、被測
定媒体中に含まれる腐食成分から半導体デバイス構成部
品を保護し、信頼性を確保する。これには、被測定媒体
に直接接触する構成部品の最表面に耐食性の高い金属膜
や無機,有機材の薄膜を形成する実装方法で対処するこ
ととした。 【0004】 【課題を解決するための手段】上記目的は、外力に対応
し電気的信号が変化するシリコン部材と、一面を前記シ
リコン部材に接合され他面を薄膜金属でメタライズされ
たガラス部材と、これら接合体を固定する固定台座と、
前記接合体と前記固定台とを固定する金属性の固定用部
材とを備え、被測定媒体との間の一部あるいは全表面が
耐食性の金属膜で覆われた半導体デバイスであって、前
記ガラス部材と前記固定台座の接合を軟ろう材とする接
合部が耐食性の高い前記金属膜で覆われたことによって
達成される。 【0005】 【0006】 【発明の実施の形態】以下、本発明を図1に示す実施例
により説明する。図において、10はダイアフラム,ゲ
ージ抵抗を有するシリコン部材、20は一面をシリコン
部材10に接合され、他面には多層の金属薄膜がガラス
の貫通孔部25あるいはこの周辺部を除くようにパター
ニング形成されたガラス部材、30はシリコン部材10
とガラス部材20の接合体を固定する金属あるいは表面
に金属膜が形成された固定台、40はシリコン部材10
からガラスの貫通孔部25を介して、外部に電気的信号
を取り出すためのリードピン、50はガラス部材と固定
台30を接合するための金属薄膜層で、その詳細は50
部拡大図に示すように多層膜で形成される。ここで、5
1はガラス部材20と金属薄膜層50との密着性を確保
するために設けられた下地金属膜で、例えば、Al/N
i,Cr/Pt,Ti/Pt,Ti/Niなどである。
52は高い耐食性を有する耐食性金属膜で、例えばAu
やAu−Siなどの薄膜で形成される、53は固定台3
0の表面にメタライズされた固定台金属膜で例えば、A
uやNi/Auをメッキプロセスなどで形成される。そ
して、これらの構成部品から半導体デバイスを構成する
ものである。 【0007】被測定媒体において、媒体がガソリンでは
硝酸,塩酸,ぎ酸など、トランスミッションオイルでは
硫黄など酸成分が含まれており、これまでの実験でセン
サ構成部品が腐食されることを確認している。それ故、
被測定媒体に直接接触する半導体デバイス構成部品、特
に、金属薄膜層50部を腐食から防止する対策が必須で
ある。 【0008】これには図3で示す実装方法の一例で対応
する。前記ガラス部材20に形成される多層の金属薄膜
層部50の形成は、先ず(a)のように下地金属膜51
をガラス部材20のチップサイズより図中斜線で示す小
さい部分にスパッタあるいは蒸着などで成膜する。この
時、チップの外周部は成膜されないようにマスクプロセ
スを用いるか、成膜後ホトリソグラフィープロセスなど
でパターニングする。次に、(b)の縦縞で示すように
下地金属膜51をチップサイズ全面にスパッタあるいは
蒸着方法で下地金属膜51を覆うように成膜する。これ
より、下地金属膜51の表面及びエッヂ部は高耐食性金
属膜52でカバーリングされる。そして、これらは図1
で示す表面を固定台金属膜53でメタラスイズされた固
定台30とAuあるいはAu−Siなどの共晶接合や熱
圧着接合方法で実装される。よって、金属膜層50は圧
力媒体中の腐食成分に直接接触しても腐食されず保護で
きる。なお、金属膜52は高耐食性の白金,タングステ
ン,ロジウムなどでも可能である。 【0009】また、ガラス部材20への金属膜形成にお
いて、この金属膜とリードピンが接触し電気的に短絡す
ることを防止するため、図4(a),(b)で示すよう
に、貫通孔部25の周辺部を除いて、図3と同様のプロ
セスから金属膜層50を形成できる。 【0010】他の実施例を図5,図6に示す。 【0011】図5においては、半導体デバイス構成部品
全体を高耐食性の金属薄膜52で覆い、被測定媒体中の
腐食成分から保護するものである。ここでの金属薄膜5
2はガラス部材20と固定台30とを接合した後、全体
をスパッタあるいは蒸着で覆うように成膜される。従っ
て、図1に示す耐食性金属膜52部は、高耐食性の金属
材料でなく、通常用いられる例えば、Sn−Ag,Pb
−Snなどの半田材(軟ろう材)でも良い。 【0012】図6においては、センサ構成部品の一部
(部品の側面)を高耐食性の金属薄膜52で覆い、被測
定媒体中の腐食成分から保護するものである。ここでの
金属薄膜52はガラス部材20と固定台30とを接合し
た後、成膜の不要な部分をマスクし、必要な一部にスパ
ッタあるいは蒸着で覆うように成膜される。従って、図
5と同様に、図1に示す耐食性金属膜52部は、高耐食
性の金属材料でなく、通常用いられる例えば、Sn−A
g,Pb−Snなどの半田材(軟ろう材)でも良い。 【0013】なお、図5,図6の実施例において、圧力
検出媒体と接触する最表面の高耐食性の材料は、例え
ば、珪素やアルミナなどの無機性やシリコーンゴムなど
の有機性物質でも代用できる。 【0014】また、一面を被測定媒体に直接接触し、他
面にシリコンで形成された抵抗素子を設けた金属ダイア
フラム構造の圧力センサにおいても、被測定媒体中の酸
など腐食成分から構成部品を保護する必要がある。我々
はこれまでの実験の中、被測定媒体がガソリンではステ
ンレス304以外の金属が腐食されることを確認してい
る。それゆえ、前述した金属材料や無機,有機材料で部
品を保護することは必須である。 【0015】本実施例では、半導体デバイスの中から被
測定媒体を圧力とする半導体式圧力センサについて述べ
たが、酸,アルカリなどの腐食成分を有する被測定媒体
の物理量を測定するデバイス全搬に共用できることは言
うまでもない。 【0016】 【発明の効果】本発明によれば、簡単なプロセスで被測
定媒体中に含まれる腐食成分から半導体デバイス構成部
品を保護でき、耐食性,信頼性の向上が可能となる効果
がある。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor device, and more particularly, to a device configuration based on a corrosive component in a medium to be measured such as gas, oil, gasoline used for controlling an engine of an automobile, and the like. The present invention relates to a semiconductor device such as a pressure sensor suitable for protecting components, improving reliability, and simplifying a mounting structure. 2. Description of the Related Art As a prior art relating to the present invention, Japanese Patent Laid-Open No. Hei 10-281908 shown in FIG. 2 is disclosed. In the drawing, 1 is a pressure-sensitive chip made of silicon, 2 is a glass pedestal, 3 is a metal fixed base, 4 is a metal film formed on the glass pedestal 2, and 5 is a soft joint for joining the glass pedestal 2 and the metal fixed base. A solder type semiconductor pressure sensor is constructed. In the present invention, the formation of the metal film of the glass base 2 is performed on a portion excluding the outer peripheral portion, and the stress on the glass base 2 when the glass base 2 is joined to the fixing base 3 is relieved. However, some of the pressure-measuring mediums corrode the components of the sensor, for example, those containing an acidic component. In particular, since the metal film 4 and the soft solder 5 are in direct contact with the medium to be measured, corrosion resistance is required to ensure reliability. In this case, nothing is disclosed about this problem or countermeasure. [0003] An object of the present invention is to protect semiconductor device components from corrosive components contained in a medium to be measured and to ensure reliability. This has been dealt with by a mounting method in which a highly corrosion-resistant metal film or a thin film of an inorganic or organic material is formed on the outermost surface of a component that directly contacts the medium to be measured. [0004] The above object is to cope with an external force.
A silicon member whose electrical signal changes, and
The other side is metallized with thin film metal
Glass member, and a fixing base for fixing these joined bodies,
A metal fixing part for fixing the joined body and the fixing base
Material and the part or whole surface between the medium to be measured and
A semiconductor device covered with a corrosion-resistant metal film,
The glass member and the fixing pedestal are joined with a soft brazing material.
Because the joint is covered with the metal film with high corrosion resistance
Achieved. [0007] The present invention will be described below with reference to an embodiment shown in FIG. In the drawing, reference numeral 10 denotes a silicon member having a diaphragm and a gauge resistance, 20 denotes a surface joined to the silicon member 10, and a multi-layered metal thin film formed on the other surface by patterning so as to remove the through-hole portion 25 of glass or its peripheral portion. Glass member 30 is a silicon member 10
A metal member for fixing the joined body of the glass member 20 and the fixing base having a metal film formed on the surface;
A lead pin for extracting an electric signal to the outside through a through-hole portion 25 made of glass from the outside. Reference numeral 50 denotes a metal thin film layer for joining the glass member and the fixing base 30.
It is formed of a multilayer film as shown in a partially enlarged view. Where 5
Reference numeral 1 denotes a base metal film provided for ensuring the adhesion between the glass member 20 and the metal thin film layer 50, for example, Al / N
i, Cr / Pt, Ti / Pt, Ti / Ni, and the like.
Reference numeral 52 denotes a corrosion-resistant metal film having high corrosion resistance.
53 is formed of a thin film of Au or Au-Si.
A metallized fixing base metal film on the surface of
u or Ni / Au is formed by a plating process or the like. Then, a semiconductor device is formed from these components. In the medium to be measured, it has been confirmed that gasoline contains acid components such as nitric acid, hydrochloric acid, and formic acid, and transmission oil contains acid components such as sulfur. I have. Therefore,
It is essential to take measures to prevent the semiconductor device components that come into direct contact with the medium to be measured, particularly the metal thin film layer 50 from corrosion. This is dealt with by an example of a mounting method shown in FIG. The formation of the multilayer metal thin film layer portion 50 formed on the glass member 20 is performed by first forming the base metal film 51 as shown in FIG.
Is formed by sputtering or vapor deposition on a portion smaller than the chip size of the glass member 20 indicated by oblique lines. At this time, a mask process is used so that the outer peripheral portion of the chip is not formed, or patterning is performed by a photolithography process or the like after the film formation. Next, as shown by vertical stripes in FIG. 3B, a base metal film 51 is formed on the entire chip size by sputtering or vapor deposition so as to cover the base metal film 51. Thus, the surface and the edge of the base metal film 51 are covered with the highly corrosion-resistant metal film 52. And these are
Is mounted on the fixing table 30 whose surface is metallized with the fixing table metal film 53 by a eutectic bonding method such as Au or Au-Si or a thermocompression bonding method. Therefore, the metal film layer 50 can be protected without being corroded even when it comes into direct contact with the corrosive component in the pressure medium. The metal film 52 can be made of platinum, tungsten, rhodium or the like having high corrosion resistance. Further, in forming a metal film on the glass member 20, in order to prevent the metal film and the lead pin from contacting and electrically short-circuiting, as shown in FIGS. Except for the peripheral portion of the portion 25, the metal film layer 50 can be formed by the same process as in FIG. Another embodiment is shown in FIGS. In FIG. 5, the entire semiconductor device component is covered with a highly corrosion-resistant metal thin film 52 to protect it from corrosive components in the medium to be measured. Metal thin film 5 here
2 is formed by joining the glass member 20 and the fixed base 30 and then forming a film so as to cover the whole by sputtering or vapor deposition. Therefore, the corrosion-resistant metal film 52 shown in FIG. 1 is not made of a highly corrosion-resistant metal material, but is usually made of, for example, Sn-Ag, Pb.
A solder material (soft solder material) such as -Sn may be used. In FIG. 6, a part of the sensor component (side surface of the component) is covered with a highly corrosion-resistant metal thin film 52 to protect it from corrosive components in the medium to be measured. Here, the metal thin film 52 is formed by joining the glass member 20 and the fixing base 30 and then masking an unnecessary portion of the film and covering a necessary portion by sputtering or vapor deposition. Therefore, similarly to FIG. 5, the corrosion-resistant metal film 52 shown in FIG. 1 is not made of a highly corrosion-resistant metal material, and is generally used, for example, Sn-A.
g, a solder material (soft solder material) such as Pb-Sn may be used. In the embodiments shown in FIGS. 5 and 6, the material having high corrosion resistance on the outermost surface which comes into contact with the pressure detecting medium can be replaced with an inorganic material such as silicon or alumina or an organic material such as silicone rubber. . Further, in a pressure sensor having a metal diaphragm structure in which one surface is in direct contact with a medium to be measured and a resistance element formed of silicon is provided on the other surface, the components are formed from corrosive components such as acid in the medium to be measured. Need to protect. We have confirmed in experiments so far that metals other than stainless steel 304 are corroded when the medium to be measured is gasoline. Therefore, it is indispensable to protect the parts with the above-mentioned metal materials, inorganic and organic materials. In this embodiment, a semiconductor pressure sensor that uses a medium to be measured as a pressure from among semiconductor devices has been described. Needless to say, they can be shared. According to the present invention, components of a semiconductor device can be protected from corrosive components contained in a medium to be measured by a simple process, and there is an effect that corrosion resistance and reliability can be improved.

【図面の簡単な説明】 【図1】本発明の一実施例を示す図。 【図2】デバイス実装方法の従来技術を示す図。 【図3】本発明の金属膜層の形成の実施例を示す図。 【図4】本発明の金属膜層の形成の他の実施例を示す
図。 【図5】本発明の他の実施例を示す図。 【図6】本発明の他の実施例を示す図。 【符号の説明】 1,10…シリコン部材、2,20…ガラス部材、25
…ガラス貫通孔部、3,30…固定台、4…金属膜、5
…ろう材、40…リードピン、50…金属膜層、51…
下地金属膜、52…耐食性金属膜、53…固定台金属
膜、54…接合金属材。
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing one embodiment of the present invention. FIG. 2 is a diagram showing a conventional technique of a device mounting method. FIG. 3 is a view showing an embodiment of forming a metal film layer according to the present invention. FIG. 4 is a view showing another embodiment of the formation of the metal film layer of the present invention. FIG. 5 is a diagram showing another embodiment of the present invention. FIG. 6 is a diagram showing another embodiment of the present invention. [Description of Signs] 1,10: Silicon member, 2, 20: Glass member, 25
... Glass through hole, 3,30 ... Fixing base, 4 ... Metal film, 5
... brazing material, 40 ... lead pin, 50 ... metal film layer, 51 ...
Base metal film, 52: corrosion-resistant metal film, 53: fixing base metal film, 54: bonding metal material.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 笹田 義幸 茨城県ひたちなか市大字高場2520番地 株式会社 日立製作所 自動車機器事業 部内 (72)発明者 久保田 正則 茨城県ひたちなか市高場2477番地 株式 会社 日立カーエンジニアリング内 (72)発明者 市川 範男 茨城県ひたちなか市高場2477番地 株式 会社 日立カーエンジニアリング内 (56)参考文献 特開 平5−182997(JP,A) 特開 平8−278218(JP,A) (58)調査した分野(Int.Cl.7,DB名) G01L 9/04 101 H01L 29/84 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Yoshiyuki Sasada 2520 Odaiba, Hitachinaka-shi, Ibaraki Prefecture Hitachi, Ltd.Automotive Equipment Division (72) Inventor Masanori Kubota 2477 Takaba, Hitachinaka-shi, Ibaraki Hitachi Car Co., Ltd. Within Engineering (72) Inventor Norio Ichikawa 2477 Takaba, Hitachinaka City, Ibaraki Prefecture Inside Hitachi Car Engineering Co., Ltd. (56) References JP-A-5-182997 (JP, A) JP-A 8-278218 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) G01L 9/04 101 H01L 29/84

Claims (1)

(57)【特許請求の範囲】 【請求項1】外力に対応し電気的信号が変化するシリコ
ン部材と、一面を前記シリコン部材に接合され他面を薄
膜金属でメタライズされたガラス部材と、これら接合体
を固定する固定台座と、前記接合体と前記固定台とを固
定する金属性の固定用部材とを備え 被測定媒体との間の一部あるいは全表面が耐食性の金属
膜で覆われた半導体デバイスであって、 前記ガラス部材と前記固定台座の接合を軟ろう材とする
接合部が耐食性の高い前記金属膜で覆われた ことを特徴
とする半導体デバイス。
(57) [Claims 1] A silicon member whose electric signal changes in response to an external force, a glass member having one surface joined to the silicon member and the other surface metalized with a thin film metal, a fixing base for fixing the joint member, and a fixing member of metal for fixing the said fixing base and the assembly is covered with a metal film of part or the entire surface corrosion resistance between the medium to be measured Semiconductor device, wherein the joining of the glass member and the fixed base is made of a soft brazing material.
A semiconductor device , wherein a junction is covered with the metal film having high corrosion resistance .
JP18106899A 1999-06-28 1999-06-28 Semiconductor devices Expired - Fee Related JP3435369B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
JP18106899A JP3435369B2 (en) 1999-06-28 1999-06-28 Semiconductor devices

Publications (2)

Publication Number Publication Date
JP2001013022A JP2001013022A (en) 2001-01-19
JP3435369B2 true JP3435369B2 (en) 2003-08-11

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Country Link
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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6848316B2 (en) * 2002-05-08 2005-02-01 Rosemount Inc. Pressure sensor assembly

Also Published As

Publication number Publication date
JP2001013022A (en) 2001-01-19

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