JPH06112333A - Semiconductor device - Google Patents

Semiconductor device

Info

Publication number
JPH06112333A
JPH06112333A JP25805992A JP25805992A JPH06112333A JP H06112333 A JPH06112333 A JP H06112333A JP 25805992 A JP25805992 A JP 25805992A JP 25805992 A JP25805992 A JP 25805992A JP H06112333 A JPH06112333 A JP H06112333A
Authority
JP
Japan
Prior art keywords
insulating film
film
resistor
semiconductor device
transistor
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.)
Granted
Application number
JP25805992A
Other languages
Japanese (ja)
Other versions
JP3233698B2 (en
Inventor
Kazuki Satomura
和樹 里村
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.)
Rohm Co Ltd
Original Assignee
Rohm 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 Rohm Co Ltd filed Critical Rohm Co Ltd
Priority to JP25805992A priority Critical patent/JP3233698B2/en
Publication of JPH06112333A publication Critical patent/JPH06112333A/en
Application granted granted Critical
Publication of JP3233698B2 publication Critical patent/JP3233698B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • Semiconductor Integrated Circuits (AREA)
  • Formation Of Insulating Films (AREA)

Abstract

PURPOSE:To ensure the insulation between a resistor and a semiconductor substrate by forming an insulating film between them to be thick without causing disconnection of an aluminum wiring connecting the resistor with a transistor, in a semiconductor device having the transistor in which the resistor is incorporated. CONSTITUTION:An insulating film 20 to be provided between a resistor 3 and a semiconductor substrate 1 is formed of a two-layer structure comprising a first insulating film 21 constituted of silicon oxide or silicon nitride and a second insulating film 22 constituted of a heat-resistant organic material.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、抵抗体内蔵型のトラン
ジスタを有する半導体装置に関する。さらに詳しくは、
抵抗体の下の絶縁膜が改良され、耐圧が向上した半導体
装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor device having a resistor built-in transistor. For more details,
The present invention relates to a semiconductor device in which an insulating film under a resistor is improved and a breakdown voltage is improved.

【0002】[0002]

【従来の技術】従来より、スイッチング用のトランジス
タなど、抵抗体を接続して使用するトランジスタでは、
トランジスタの形成された半導体基板表面に、絶縁膜な
どを介してポリシリコン膜などで抵抗体が形成されてい
る。このような従来の抵抗体内蔵型トランジスタの断面
を図2に示す。図2において、たとえばp型の半導体基
板1にn型の不純物を導入してベース領域6が形成さ
れ、さらにベース領域6にp型不純物を導入してエミッ
タ領域8が形成され、半導体基板1をコレクタ領域とし
てバイポーラの縦形pnpトランジスタが形成されてい
る。スイッチング用のトランジスタなどでは、このベー
ス領域6と直列に1〜100 kΩ位の抵抗体3が接続され
て使用され、抵抗体3も半導体層で形成された半導体装
置が使用されている。この抵抗体3が図2に示すよう
に、半導体基板1の表面に形成された酸化ケイ素膜など
の絶縁膜2の上にポリシリコン膜などで形成せられ、そ
の一端はアルミニウム配線膜4により前記トランジスタ
のベース領域6と接続され、他端はやはりアルミニウム
配線膜10が形成され、外部引出し用端子とされている。
2. Description of the Related Art Conventionally, in a transistor such as a switching transistor, which is used by connecting a resistor,
A resistor is formed of a polysilicon film or the like via an insulating film or the like on the surface of the semiconductor substrate on which the transistor is formed. A cross section of such a conventional transistor with a built-in resistor is shown in FIG. In FIG. 2, for example, an n-type impurity is introduced into the p-type semiconductor substrate 1 to form a base region 6, and a p-type impurity is introduced into the base region 6 to form an emitter region 8. A bipolar vertical pnp transistor is formed as a collector region. In a switching transistor or the like, a resistor 3 of about 1 to 100 kΩ is connected and used in series with the base region 6, and the resistor 3 is also a semiconductor device formed of a semiconductor layer. As shown in FIG. 2, the resistor 3 is formed of a polysilicon film or the like on the insulating film 2 such as a silicon oxide film formed on the surface of the semiconductor substrate 1, and one end of the resistor 3 is formed by the aluminum wiring film 4. It is connected to the base region 6 of the transistor, and the other end is also formed with an aluminum wiring film 10 to serve as an external lead terminal.

【0003】この絶縁膜2に用いられる酸化ケイ素膜
は、シリコン基板を酸化するかまたはCVD法により堆
積して形成される。酸化法でなく、CVD法によるばあ
いは、酸化ケイ素膜の他にチッ化ケイ素膜でも同様に形
成でき、このいずれかが使用されている。
The silicon oxide film used for the insulating film 2 is formed by oxidizing a silicon substrate or depositing it by a CVD method. When the CVD method is used instead of the oxidation method, a silicon nitride film can be similarly formed in addition to the silicon oxide film, and either one is used.

【0004】一方、ICやLSIなどでは、アルミニウ
ム配線膜などの層間絶縁膜として簡単に絶縁薄膜を形成
できるSOG膜やポリイミド膜などが使用されているば
あいがある。
On the other hand, in ICs, LSIs and the like, there are cases where an SOG film or a polyimide film which can easily form an insulating thin film is used as an interlayer insulating film such as an aluminum wiring film.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、酸化ケ
イ素膜やチッ化ケイ素膜では、緻密な膜を形成するのが
難しく、両端に高電圧が印加されると絶縁破壊が生じた
り、ベースコレクタ間がリークして不良品となることが
ある。そのため、静電気に対する強度を高める必要があ
るが、その膜厚を厚くすると図3に示すように段差部A
のアルミニウム配線膜に線切れが発生する。これは、ア
ルミニウム配線膜はスパッタリングや蒸着法などで形成
されるが、いずれにしても垂直部分にはアルミニウム膜
は形成され難くその垂直部分の高さが高いとアルミニウ
ム膜が被着されないからである。一方、ベース領域6の
電極であるアルミニウム配線膜4を形成するためにはコ
ンタクト孔7をエッチングによって形成するのである
が、前記段差部Aをなくしてベース部の絶縁膜を厚くす
ると、コンタクト孔7の周縁部が鉛直の絶壁状となり、
フィールド部(抵抗体の形成部分)とベース部との段差
が大きくなり過ぎ、ベース領域6の電極膜形成部で線切
れが発生する。このため、絶縁膜の厚さは従来1〜1.5
μm程度までが限度であり、静電気に対する耐圧には充
分でなく、半導体装置に静電気がかからないように取扱
いを充分注意しなければならないと共に、予期せぬ不良
が発生して信頼性が低下するという問題がある。
However, with a silicon oxide film or a silicon nitride film, it is difficult to form a dense film, and when a high voltage is applied to both ends, dielectric breakdown occurs, or between the base collector and It may leak and become a defective product. Therefore, it is necessary to increase the strength against static electricity, but if the film thickness is increased, as shown in FIG.
Disconnection occurs in the aluminum wiring film. This is because the aluminum wiring film is formed by sputtering or vapor deposition, but in any case, it is difficult to form the aluminum film on the vertical portion, and if the height of the vertical portion is high, the aluminum film is not deposited. . On the other hand, the contact hole 7 is formed by etching in order to form the aluminum wiring film 4 which is the electrode of the base region 6. However, if the step portion A is eliminated and the insulating film of the base portion is thickened, the contact hole 7 is formed. The peripheral part of is a vertical cliff,
The step between the field portion (resistor forming portion) and the base portion becomes too large, and line breakage occurs at the electrode film forming portion in the base region 6. For this reason, the thickness of the insulating film is conventionally 1 to 1.5.
There is a problem that the limit is up to about μm, the withstand voltage against static electricity is not sufficient, and the semiconductor device must be handled with care so that static electricity is not applied, and unexpected failures occur and reliability is reduced. There is.

【0006】本発明は叙上の事情に鑑みてなされたもの
であり、アルミニウム配線膜の断線を引き起こすことな
く、絶縁膜の膜厚を厚くして、静電気に対して充分な強
度を有する絶縁膜を形成し、取扱いが容易で、信頼性の
高い半導体装置を提供することを目的とする。
The present invention has been made in view of the above circumstances, and an insulating film having a sufficient strength against static electricity can be obtained by increasing the thickness of the insulating film without causing breakage of the aluminum wiring film. It is an object of the present invention to provide a highly reliable semiconductor device which is easy to handle and has high reliability.

【0007】[0007]

【課題を解決するための手段】本発明による半導体装置
は、半導体基板にトランジスタが形成され、該半導体基
板表面に絶縁膜を介して前記トランジスタに接続された
抵抗体が形成されてなる半導体装置であって、前記絶縁
膜が酸化ケイ素膜またはチッ化ケイ素膜からなる第1の
絶縁膜および耐熱性の有機系材料からなる第2の絶縁膜
の2層構造で形成されていることを特徴とする。
A semiconductor device according to the present invention is a semiconductor device in which a transistor is formed on a semiconductor substrate, and a resistor connected to the transistor via an insulating film is formed on the surface of the semiconductor substrate. The insulating film has a two-layer structure including a first insulating film made of a silicon oxide film or a silicon nitride film and a second insulating film made of a heat-resistant organic material. .

【0008】[0008]

【作用】本発明によれば、半導体基板表面に形成される
絶縁膜を酸化ケイ素膜またはチッ化ケイ素膜からなる第
1の絶縁膜と、耐熱性のある有機系材料からなる第2の
絶縁膜とで形成しているため、電極膜形成のためのコン
タクト孔形成などは酸化ケイ素膜などの第1の絶縁膜で
正確に形成でき、静電気に対する絶縁性はその上に形成
された第2の絶縁膜で充分達成できる。しかも第2の絶
縁膜は、粘性を大きくした液状物を塗布することにより
形成されているため、肩はダレて絶壁にならず、アルミ
ニウム配線膜の線切れも発生しない。すなわち、膜端部
の形状が緩和されてなだらかな斜面状となる(ステップ
カバレッジが良くなる)。このため、従来の熱酸化膜な
どによる絶縁膜に比べて、アルミニウム配線の断線を引
き起こすことなく、絶縁膜の膜厚を増加することがで
き、静電気に対して充分な強度を確保することができ
る。
According to the present invention, the insulating film formed on the surface of the semiconductor substrate is a first insulating film made of a silicon oxide film or a silicon nitride film and a second insulating film made of a heat-resistant organic material. Since the contact holes for electrode film formation, etc. can be accurately formed by the first insulating film such as a silicon oxide film, the insulating property against static electricity can be formed by the second insulating film formed on the first insulating film. Membranes can be sufficient Moreover, since the second insulating film is formed by applying a liquid material having increased viscosity, the shoulder does not sag and become a cliff, and the aluminum wiring film does not break. That is, the shape of the film edge is relaxed to form a gentle slope (step coverage is improved). Therefore, compared with the conventional insulating film made of a thermal oxide film or the like, the thickness of the insulating film can be increased without causing breakage of the aluminum wiring, and sufficient strength against static electricity can be secured. .

【0009】[0009]

【実施例】つぎに、本発明を図面に基づいて説明する。
図1は本発明の半導体装置の一実施例を示す断面図であ
る。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view showing an embodiment of the semiconductor device of the present invention.

【0010】図1において、半導体基板1に不純物が導
入されてベース領域6、エミッタ領域8が形成されるこ
とによりトランジスタが形成され、半導体基板1の表面
に絶縁膜2を介してポリシリコン膜などで抵抗体3が形
成され、該抵抗体3の一端がトランジスタのベース領域
6とアルミニウム配線膜4で連結され、抵抗体3の他端
にはアルミニウム配線膜10が形成されて外部引出用端子
とされている。本実施例では、抵抗体3と半導体基板1
とのあいだに介在される絶縁膜20が第1の絶縁膜21と第
2の絶縁膜22とで形成されているところに特徴がある。
In FIG. 1, a transistor is formed by introducing impurities into the semiconductor substrate 1 to form a base region 6 and an emitter region 8, and a polysilicon film or the like is formed on the surface of the semiconductor substrate 1 via an insulating film 2. A resistor 3 is formed, one end of the resistor 3 is connected to the base region 6 of the transistor by an aluminum wiring film 4, and an aluminum wiring film 10 is formed on the other end of the resistor 3 to form an external lead terminal. Has been done. In this embodiment, the resistor 3 and the semiconductor substrate 1
It is characterized in that the insulating film 20 interposed between and is formed by the first insulating film 21 and the second insulating film 22.

【0011】この第1の絶縁膜21は酸化ケイ素またはチ
ッ化ケイ素からなる従来の絶縁膜であり、その厚さは最
大で1〜1.5 μm程度である。この第1の絶縁膜21はベ
ース領域6、エミッタ領域8を形成する際のマスクとし
ても使用されるため、フィールド部での絶縁膜は厚く形
成されているが、そのフィールド部での厚さで約1〜1.
5 μm程度に形成されている。
The first insulating film 21 is a conventional insulating film made of silicon oxide or silicon nitride and has a maximum thickness of about 1 to 1.5 μm. Since the first insulating film 21 is also used as a mask when forming the base region 6 and the emitter region 8, the insulating film in the field portion is formed thick, but the thickness in the field portion is large. About 1-1.
It is formed to about 5 μm.

【0012】本実施例では、この絶縁膜21の上に、さら
に別の第2の絶縁膜22が形成されている。第2の絶縁膜
22は450 ℃以上の耐熱性を有する有機系材料からなる絶
縁膜でたとえば、ポリイミド、オルガノシロキサンなど
を使用できる。この第2の絶縁膜22が450 ℃以上の耐熱
性を必要とする理由は、あとの工程(たとえば、アルミ
ニウムのシンター工程)で、基板温度が4百数十度まで
上がるため、その温度になっても絶縁膜に異常を来たさ
ないようにするためである。また有機系材料を使用する
のは、有機系材料は溶剤により、タッピングやスピンコ
ーティングで塗布することができ、300 〜400 ℃で数十
分間乾燥すれば固化でき、しかも、粘性が数ポイズから
100 ポイズ程度の高いものを使用すれば垂れ流れること
もなく、また厚く塗布することもできるからである。S
OG膜も同様にスピンコーティングで塗布できるが厚い
膜を形成できず、有機系絶縁膜には及ばない。
In this embodiment, another second insulating film 22 is formed on the insulating film 21. Second insulating film
Reference numeral 22 is an insulating film made of an organic material having a heat resistance of 450 ° C. or higher, and, for example, polyimide or organosiloxane can be used. The reason why the second insulating film 22 needs to have a heat resistance of 450 ° C. or higher is that the substrate temperature rises up to four hundred and several tens of degrees in a later step (for example, an aluminum sinter step). This is to prevent the insulating film from becoming abnormal. In addition, organic materials are used because they can be applied by tapping or spin coating with a solvent, can be solidified by drying for several tens of minutes at 300 to 400 ° C, and have a viscosity of several poises.
This is because if you use a material with a high poise of about 100 poise, it will not drip and can be applied thickly. S
Similarly, an OG film can be applied by spin coating, but a thick film cannot be formed, which is less than that of an organic insulating film.

【0013】第2の絶縁膜22は有機系材料の粘性のある
液状体をタッピングまたはスピンコーティングすること
により形成されているので、抵抗体3とベース領域6と
を配線する配線膜4の形成部分はなだらかな斜面状とな
り、絶縁膜の厚さを増加してもその斜面に沿って形成さ
れるアルミニウム配線は断線するおそれがなくなる。
Since the second insulating film 22 is formed by tapping or spin-coating a viscous liquid material of an organic material, a portion where the wiring film 4 for connecting the resistor 3 and the base region 6 is formed. The sloped surface has a gentle slope, and even if the thickness of the insulating film is increased, the aluminum wiring formed along the sloped surface is not likely to be broken.

【0014】このような構成とすることにより、第1お
よび第2の絶縁膜21および22からなる絶縁膜20の膜厚は
2μm以上とすることができ、また有機系絶縁膜は緻密
性もあり、静電気に対する充分な強度をうることができ
る。また、絶縁膜20のうち、半導体基板1と直接接する
部分(第1の絶縁膜21)は、従来のように酸化ケイ素膜
やチッ化ケイ素膜で形成されているため、表面が平らな
絶縁膜が形成され、エッチングによって正確なコンタク
ト孔などが形成され、設計上の精度も充分である。
With such a structure, the thickness of the insulating film 20 composed of the first and second insulating films 21 and 22 can be 2 μm or more, and the organic insulating film is dense. It is possible to obtain sufficient strength against static electricity. In addition, since the portion of the insulating film 20 that directly contacts the semiconductor substrate 1 (first insulating film 21) is formed of a silicon oxide film or a silicon nitride film as in the conventional case, the insulating film having a flat surface. Is formed, an accurate contact hole is formed by etching, and the design accuracy is sufficient.

【0015】また、絶縁膜形成後にさらに高温を伴う処
理工程があるばあいには、700 ℃程度の高温に絶えうる
高耐熱性を有するポリラダーオルガノシロキサンなどの
有機系絶縁膜を使用することが好ましい。
In addition, if there is a treatment step involving a higher temperature after forming the insulating film, it is preferable to use an organic insulating film such as polyladder organosiloxane having high heat resistance capable of withstanding a high temperature of about 700 ° C. preferable.

【0016】[0016]

【発明の効果】本発明によれば、抵抗体を内蔵する半導
体装置において、抵抗体とベース領域とを接続するアル
ミニウム配線膜の断線を引き起こすことなく、抵抗体と
半導体基板(コレクタ)領域とのあいだの絶縁膜を充分
厚く形成でき、静電気に対する絶縁耐圧強度を充分とし
てその破損を防ぐことができ、乾燥時期で静電気の起り
易いときでも、取扱いが容易となり、しかも半導体装置
の信頼性も向上する。
According to the present invention, in a semiconductor device having a built-in resistor, the resistor and the semiconductor substrate (collector) region can be formed without breaking the aluminum wiring film connecting the resistor and the base region. The insulating film between them can be formed thick enough to prevent damage due to sufficient withstand voltage strength against static electricity, making it easy to handle even when static electricity is prone to occur during the drying period, and also improving the reliability of semiconductor devices. .

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の半導体装置の一実施例を示す断面図で
ある。
FIG. 1 is a sectional view showing an embodiment of a semiconductor device of the present invention.

【図2】従来の半導体装置の一例を示す断面図である。FIG. 2 is a cross-sectional view showing an example of a conventional semiconductor device.

【図3】従来の半導体装置の絶縁膜を厚くしたときの断
面図である。
FIG. 3 is a cross-sectional view of a conventional semiconductor device having a thick insulating film.

【符号の説明】[Explanation of symbols]

1 半導体基板(コレクタ領域) 3 抵抗体 4 アルミニウム配線膜 20 絶縁膜 21 第1の絶縁膜 22 第2の絶縁膜 1 Semiconductor Substrate (Collector Region) 3 Resistor 4 Aluminum Wiring Film 20 Insulating Film 21 First Insulating Film 22 Second Insulating Film

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 半導体基板にトランジスタが形成され、
該半導体基板表面に絶縁膜を介して前記トランジスタに
接続された抵抗体が形成されてなる半導体装置であっ
て、前記絶縁膜が酸化ケイ素膜またはチッ化ケイ素膜か
らなる第1の絶縁膜および耐熱性の有機系材料からなる
第2の絶縁膜の2層構造で形成されてなる半導体装置。
1. A transistor is formed on a semiconductor substrate,
A semiconductor device having a resistor connected to the transistor via an insulating film on the surface of the semiconductor substrate, wherein the insulating film is a first insulating film made of a silicon oxide film or a silicon nitride film and a heat-resistant film. A semiconductor device having a two-layer structure of a second insulating film made of a conductive organic material.
JP25805992A 1992-09-28 1992-09-28 Semiconductor device Expired - Fee Related JP3233698B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25805992A JP3233698B2 (en) 1992-09-28 1992-09-28 Semiconductor device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25805992A JP3233698B2 (en) 1992-09-28 1992-09-28 Semiconductor device

Publications (2)

Publication Number Publication Date
JPH06112333A true JPH06112333A (en) 1994-04-22
JP3233698B2 JP3233698B2 (en) 2001-11-26

Family

ID=17314967

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25805992A Expired - Fee Related JP3233698B2 (en) 1992-09-28 1992-09-28 Semiconductor device

Country Status (1)

Country Link
JP (1) JP3233698B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
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US8773627B2 (en) 2011-10-07 2014-07-08 Japan Display West Inc. Liquid crystal display device and method for manufacturing liquid crystal display device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8773627B2 (en) 2011-10-07 2014-07-08 Japan Display West Inc. Liquid crystal display device and method for manufacturing liquid crystal display device
US8988641B2 (en) 2011-10-07 2015-03-24 Japan Display West Inc. Liquid crystal display device and method for manufacturing liquid crystal display device

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