JPS5992575A - Schottky barrier diode in semiconductor integrated circuit device - Google Patents

Schottky barrier diode in semiconductor integrated circuit device

Info

Publication number
JPS5992575A
JPS5992575A JP57201971A JP20197182A JPS5992575A JP S5992575 A JPS5992575 A JP S5992575A JP 57201971 A JP57201971 A JP 57201971A JP 20197182 A JP20197182 A JP 20197182A JP S5992575 A JPS5992575 A JP S5992575A
Authority
JP
Japan
Prior art keywords
high concentration
layer
type
region
schottky barrier
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.)
Pending
Application number
JP57201971A
Other languages
Japanese (ja)
Inventor
Nobuo Owada
伸郎 大和田
Masanori Odaka
小高 雅則
Hideyuki Hosoe
細江 英之
Mitsuaki Horiuchi
光明 堀内
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
Original Assignee
Hitachi 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 filed Critical Hitachi Ltd
Priority to JP57201971A priority Critical patent/JPS5992575A/en
Publication of JPS5992575A publication Critical patent/JPS5992575A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10DINORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D8/00Diodes
    • H10D8/60Schottky-barrier diodes 

Landscapes

  • Electrodes Of Semiconductors (AREA)

Abstract

PURPOSE:To prevent the generation of negative resistance characteristic by a method wherein a high concentration impurity region which has a higher concentration than the following impurity region and reverse conductivity type is provided at a part of a junction surface, in a Schottky barrier diode having a high concentration impurity region at the junction interface. CONSTITUTION:An Si semiconductor base body 1 has an N<+> type buried layer 3 and an N<-> type epitaxial layer 4 on a P type semiconductor substrate 2. The N<+> type high concentration layer 7 is provided at junction interface between an electrode material layer 6 in order to increase the junction capacitance of the Schottky barrier diode formed on that region, and further the P<+> type high concentration region 9 is provided at a part of the junction interface in order to restrain the generation of negative resistance characteristic due to providing the high concentration layer 7. It is better to arrange the P<+> type high concentration region 9 in the periphery of the junction interface 8 by considering the facility of alignment.

Description

【発明の詳細な説明】 この発明は、半導体集積回路装置におけるショットキバ
リアダイオード(以下、SBDという)に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a Schottky barrier diode (hereinafter referred to as SBD) in a semiconductor integrated circuit device.

半導体集積回路装置、特にバイポーラ型のものにおいて
は、高速動作の実現等のためSBDが多用されている。
In semiconductor integrated circuit devices, especially bipolar type devices, SBDs are often used to achieve high-speed operation.

たとえば、高速バイポーラメモリにSBDを用いる場合
、順方向立上り電圧を制御するというSBD本来の機能
を得る他に、SBDの接合容量をスピードアップコンデ
ンサとして使用したり、あるいは耐α線ソフトエラー強
度を高めたりする方法が採られる。このような場合、S
BDの接合容量を大きくすることを要し、そのため、イ
オン打込み法によって接合界面に高濃度層を形成してい
る。
For example, when using an SBD in a high-speed bipolar memory, in addition to obtaining the SBD's original function of controlling the forward rising voltage, the junction capacitance of the SBD can be used as a speed-up capacitor, or the resistance to α-ray soft errors can be increased. A method of doing so is adopted. In such a case, S
It is necessary to increase the junction capacitance of the BD, and therefore a high concentration layer is formed at the junction interface by ion implantation.

ところで、このような高濃度層を有するSBDにおいて
、第1図に示すように、aのような正常特性を示すこと
なく、bのような負性抵抗特性を示すという問題が生じ
た。
However, in an SBD having such a high concentration layer, as shown in FIG. 1, a problem has arisen in that it does not exhibit normal characteristics as shown in a but shows negative resistance characteristics as shown in b.

したがって、この発明は、そのような負性抵抗特性の発
生を確実に抑え、SBD特性の制御性を改善することを
目的とするものである。
Therefore, it is an object of the present invention to reliably suppress the occurrence of such negative resistance characteristics and improve the controllability of the SBD characteristics.

以下、この発明の内容を明らかにする。The content of this invention will be clarified below.

第2図はこの発明によるSBDの構造を示し、(A)が
平面図、(B)が断面図である。
FIG. 2 shows the structure of the SBD according to the present invention, with (A) being a plan view and (B) being a sectional view.

シリコン半導体母体1は、P型の半導体基板2の上にN
+型の埋込み層3とN−型のエピタキシャル層4とを有
している。このシリコン半導体母体1上、SBDは、ア
イソレーションのための選択酸化膜5の内側に形成され
ている。
A silicon semiconductor base 1 is placed on a P-type semiconductor substrate 2.
It has a + type buried layer 3 and an N- type epitaxial layer 4. On this silicon semiconductor matrix 1, the SBD is formed inside a selective oxide film 5 for isolation.

SBDは金属と半導体との間に形成されるショットキ障
壁を利用したダイオードであり、この場合、電極材料層
6が金属に相当し、エピタキシャル層4の表面のN+型
の高濃度層7が半導体に相当する。前述した負性抵抗特
性は、接合界面近傍に高濃度層7がある場合にのみ発生
する。高濃度層7の不純物濃度はたとえば2X1017
cm−3である。負性抵抗特性が発生するメカニズムに
ついて半導体物理の観点から説明することは困鐙である
が、各種の実験から、高濃度層7が負性抵抗特性を発生
させていることを明らかにすることができた。
An SBD is a diode that utilizes a Schottky barrier formed between a metal and a semiconductor. In this case, the electrode material layer 6 corresponds to the metal, and the N+ type high concentration layer 7 on the surface of the epitaxial layer 4 corresponds to the semiconductor. Equivalent to. The aforementioned negative resistance characteristic occurs only when the high concentration layer 7 is present near the junction interface. The impurity concentration of the high concentration layer 7 is, for example, 2X1017
cm-3. Although it is difficult to explain the mechanism by which negative resistance characteristics occur from the perspective of semiconductor physics, various experiments have revealed that the high concentration layer 7 causes negative resistance characteristics. did it.

この発明では、高濃度層7に起因する負性抵抗特性の発
生を抑えるため、SBD接合面8の一部分にP+型の高
濃度領域9を形成する構造を採る。
In this invention, in order to suppress the occurrence of negative resistance characteristics due to the high concentration layer 7, a structure is adopted in which a P+ type high concentration region 9 is formed in a part of the SBD junction surface 8.

このP+型の高濃度領域9が負性抵抗特性を抑止しうろ
ことも、実験的に確認されたものである。
It has also been experimentally confirmed that this P+ type high concentration region 9 suppresses negative resistance characteristics.

P+型の高濃度領域9はアライメントの容易性などを考
慮した場合、SBD接合而8面周辺部に配置するのが良
い。なお、高濃度領域9については、高濃度層7との相
殺があるので、高濃度層7よりも不純物濃度を高くする
ことを要する。
Considering the ease of alignment, etc., the P+ type high concentration region 9 is preferably placed around the 8th surface of the SBD junction. Note that the impurity concentration of the high concentration region 9 needs to be higher than that of the high concentration layer 7 because there is a cancellation with the high concentration layer 7 .

コンタクト周辺部にP+領域を形成する構造としては、
ガードリングと呼ばれるものが既に知られている。しか
し、ガードリングは、PN接合の周辺部におけるリーク
電流成分を除去するという機能から、コンタクト周辺の
全域にわたるものであり、その分だけ余分な面積を要し
、高集積化が大きく進んだ段階では採用しえない。その
点、こ3− の発明における前記P+型の高濃度領域9は、その機能
をガードリングと異にしていることは勿論のこと、構造
的にもSBD接合面8の周辺の少なくとも一部がP+型
の高濃度領域9に対して開放されているので、その開放
されている分だけ集積度の面からも有利である。
The structure for forming a P+ region around the contact is as follows:
Something called a guard ring is already known. However, since the guard ring has the function of removing leakage current components in the periphery of the PN junction, it covers the entire area around the contact, which requires an extra area, and it is difficult to use at a stage when high integration has progressed. I can't hire you. In this respect, the P+ type high concentration region 9 in this 3- invention not only has a function different from that of a guard ring, but also has a structure in which at least a portion of the periphery of the SBD bonding surface 8 is Since it is open to the P+ type high concentration region 9, the openness is advantageous in terms of the degree of integration.

次に、前記P+型の高濃度領域9の形成について、実際
のバイポーラ型の半導体集積回路装置との関連において
、好ましい実施例を説明する。
Next, a preferred embodiment of the formation of the P+ type high concentration region 9 will be described in relation to an actual bipolar semiconductor integrated circuit device.

第3図において、シリコン半導体母体1上のエピタキシ
ャル層4内には、前述したSBDとともにバイポーラト
ランジスタが形成されている。このバイポーラトランジ
スタは、P+型のベース領域10、N生型のエミッタ領
域11およびN÷型のコレクタコンタクト領域12を含
んでいる。そして、ベース領域10にはアルミニウム電
極13がオーミックコンタクトされ、同様に、エミッタ
領域11にアルミニウム電極14、コレクタコンタクト
領域12にアルミニウム電極15がそれぞれオーミック
コンタクトされている。
In FIG. 3, a bipolar transistor is formed in an epitaxial layer 4 on a silicon semiconductor matrix 1 along with the above-mentioned SBD. This bipolar transistor includes a P+ type base region 10, an N-type emitter region 11, and an N÷ type collector contact region 12. An aluminum electrode 13 is in ohmic contact with the base region 10, and similarly, an aluminum electrode 14 and an aluminum electrode 15 are in ohmic contact with the emitter region 11 and the collector contact region 12, respectively.

4− ここで、SBD部分については前述と同様であるのでそ
の説明は省略するが、負性抵抗特性の発生を抑止するた
めのP+型の高濃度領域9を前記ベース領域10の形成
時に同時に形成することができる。そうすれば、P+型
の高濃度領域9の形成の工程を新たに設ける必要がない
のでプロセス上有利になる。しかし、P+型の高濃度領
域9については、ベース領域10とは別の工程で形成す
ることもできる。
4- Here, since the SBD portion is the same as described above, its explanation will be omitted, but a P+ type high concentration region 9 for suppressing the occurrence of negative resistance characteristics is formed at the same time as the base region 10 is formed. can do. In this case, there is no need to provide a new step for forming the P+ type high concentration region 9, which is advantageous in terms of the process. However, the P+ type high concentration region 9 can also be formed in a separate process from that of the base region 10.

以上のように、この発明にあっては、SBD接合界面近
傍に高濃度層7を形成した場合において、5Br)接合
面8の一部分に、高濃度層7と逆導電型の高濃度領域9
を形成するようにしているので、負性抵抗特性の発生を
有効に抑止することができる。
As described above, in the present invention, when the high concentration layer 7 is formed near the SBD junction interface, a high concentration region 9 of the opposite conductivity type to the high concentration layer 7 is formed in a part of the 5Br) junction surface 8.
Therefore, the occurrence of negative resistance characteristics can be effectively suppressed.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はSBDの電圧−電流特性を示す図、第2図はこ
の発明によるSBDの構造を示し、(A)が平面図、(
B)が断面図、 第3図はこの発明を適用したバイポーラ型の半導体集積
回路装置を示す断面図である。 1・・・半導体母体、4・・・エピタ都シャル層(半導
体層)、6・・・電極材料層、7・・・高濃度層、8・
・・SBD接合面、9・・・高濃度領域。 7−
FIG. 1 is a diagram showing the voltage-current characteristics of the SBD, and FIG. 2 is a diagram showing the structure of the SBD according to the present invention.
B) is a sectional view, and FIG. 3 is a sectional view showing a bipolar type semiconductor integrated circuit device to which the present invention is applied. DESCRIPTION OF SYMBOLS 1... Semiconductor base body, 4... Epitaxial layer (semiconductor layer), 6... Electrode material layer, 7... High concentration layer, 8...
...SBD junction surface, 9...high concentration region. 7-

Claims (1)

【特許請求の範囲】 半導体母体の一面に、ショットキバリアダイオードをも
つ半導体集積回路が形成されており、そのショットキバ
リアダイオードの部分が次のような(A)〜(D)の構
造を有する、半導体集積回路装置におけるショットキバ
リアダイオード。 (A)前記半導体母体の一面の第1導電型の半導体層の
表面に、同じ第1導電型の高濃度層が形成されている。 (B)前記高濃度層の上に電極材料層が形成されている
。 (C)前記高濃度層と電極材料層との接合面の一部に、
前記高濃度層よりも高い不純物濃度をもち、かつ前記第
1導電型と逆の第2導電型である高濃度領域が形成され
ている。 (D)前記接合面の周辺の少なくとも一部が、前記第2
導電型の高濃度領域に対して開放されている。
[Scope of Claims] A semiconductor in which a semiconductor integrated circuit having a Schottky barrier diode is formed on one surface of a semiconductor matrix, and the Schottky barrier diode portion has the following structures (A) to (D). Schottky barrier diode in integrated circuit devices. (A) A high concentration layer of the same first conductivity type is formed on the surface of the semiconductor layer of the first conductivity type on one surface of the semiconductor matrix. (B) An electrode material layer is formed on the high concentration layer. (C) A part of the bonding surface between the high concentration layer and the electrode material layer,
A high concentration region is formed that has a higher impurity concentration than the high concentration layer and is of a second conductivity type opposite to the first conductivity type. (D) At least a portion of the periphery of the joint surface is connected to the second
It is open to the high concentration region of the conductivity type.
JP57201971A 1982-11-19 1982-11-19 Schottky barrier diode in semiconductor integrated circuit device Pending JPS5992575A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57201971A JPS5992575A (en) 1982-11-19 1982-11-19 Schottky barrier diode in semiconductor integrated circuit device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57201971A JPS5992575A (en) 1982-11-19 1982-11-19 Schottky barrier diode in semiconductor integrated circuit device

Publications (1)

Publication Number Publication Date
JPS5992575A true JPS5992575A (en) 1984-05-28

Family

ID=16449793

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57201971A Pending JPS5992575A (en) 1982-11-19 1982-11-19 Schottky barrier diode in semiconductor integrated circuit device

Country Status (1)

Country Link
JP (1) JPS5992575A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4903087A (en) * 1987-01-13 1990-02-20 National Semiconductor Corporation Schottky barrier diode for alpha particle resistant static random access memories
US5438218A (en) * 1990-06-29 1995-08-01 Canon Kk Semiconductor device with Shottky junction

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4903087A (en) * 1987-01-13 1990-02-20 National Semiconductor Corporation Schottky barrier diode for alpha particle resistant static random access memories
US5438218A (en) * 1990-06-29 1995-08-01 Canon Kk Semiconductor device with Shottky junction

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