JPS63133570A - Manufacture of hot-electron transistor - Google Patents

Manufacture of hot-electron transistor

Info

Publication number
JPS63133570A
JPS63133570A JP27977086A JP27977086A JPS63133570A JP S63133570 A JPS63133570 A JP S63133570A JP 27977086 A JP27977086 A JP 27977086A JP 27977086 A JP27977086 A JP 27977086A JP S63133570 A JPS63133570 A JP S63133570A
Authority
JP
Japan
Prior art keywords
layer
gaas
region
collector
emitter
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
JP27977086A
Other languages
Japanese (ja)
Inventor
Hiroharu Kawai
弘治 河合
Toshiharu Imanaga
俊治 今永
Ichiro Hase
伊知郎 長谷
Kunio Kaneko
金子 邦雄
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.)
National Institute of Advanced Industrial Science and Technology AIST
Original Assignee
Agency of Industrial Science and Technology
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 Agency of Industrial Science and Technology filed Critical Agency of Industrial Science and Technology
Priority to JP27977086A priority Critical patent/JPS63133570A/en
Publication of JPS63133570A publication Critical patent/JPS63133570A/en
Pending legal-status Critical Current

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  • Bipolar Transistors (AREA)

Abstract

PURPOSE:To shorten the length of a wiring part and to reduce the resistance of the wiring part by a method wherein a base-electrode extraction part which functions as a part of an external base region is formed in a self-aligned manner. CONSTITUTION:A side wall 17a is formed by a reactive ion etching (RIE) method; the side and the upper surface of an emitter region 16 are coated with an Si3N4 layer 17; after that, ions of Mg<+> are implanted into the interface between an n<+> GaAs layer 12a acting as a collector layer 12 and an i-type AlxGa1-xAs layer 13 acting as a collector barrier layer 13; in addition, ions of Si<+> are implanted into an i-type AlGaAs layer 15a acting as an emitter barrier layer. Then, n<+> GaAs is grown epitaxially on the whole surface by an MOCVD method, and an n<+> GaAs layer 19a acting as a base-electrode extraction part 19 is formed. During this process, n<+> GaAs is not separated on the Si3N4 layer 17 and is grown selectively only on the i-type AlGaAs layer 15a excluding the Si3N4 layer 17; as a result, self-alignment with reference to the emitter region 16 is achieved.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ホットエレクトロン・トランジスタの製法に
関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing hot electron transistors.

〔発明の概要〕[Summary of the invention]

本発明は、ホットエレクトロン・トランジスタの製法で
あり、エミッタ領域の側面と上面を絶縁層で被覆した後
、絶縁層で被覆されていないエミッタバリア層上に選択
エピタキシャル成長でベース電極取出し部を形成するこ
とにより、外部ベース領域の線路抵抗を小さくすること
ができるようにしたものである。
The present invention is a method for manufacturing a hot electron transistor, in which the side and top surfaces of the emitter region are coated with an insulating layer, and then a base electrode extraction portion is formed by selective epitaxial growth on the emitter barrier layer that is not covered with the insulating layer. This makes it possible to reduce the line resistance in the external base region.

〔従来の技術〕[Conventional technology]

第2図に従来のメサ型ホットエレクトロン・トランジス
タの断面構造を示す。このホットエレクトロン・トラン
ジスタ(6)は、n1形GaAsコレクタ領域(1)上
にl形Aj! GaAsコレクタバリア領域(2)及び
n+形GaAsベース領域(3)が順次形成され、さら
にベース領域(3)の所要領域上にi形An GaAs
エミッタバリア領域(4)及びn+形GaAsエミッタ
領域(5)が順次形成されて成る。そしてエミッタ領域
(5)上にエミッタ電極(7)が形成され、エミッタ電
極(7)の下の真性領域(10)より外部に延長した外
部ベース領域(3a)上にベース電極(8)が形成され
、さらにコレクタ領域(1)上にコレクタ電極(9)が
形成されている。
FIG. 2 shows the cross-sectional structure of a conventional mesa-type hot electron transistor. This hot electron transistor (6) has an l-type Aj! on an n1-type GaAs collector region (1). A GaAs collector barrier region (2) and an n+ type GaAs base region (3) are sequentially formed, and further an i-type An GaAs layer is formed on a required region of the base region (3).
An emitter barrier region (4) and an n+ type GaAs emitter region (5) are sequentially formed. An emitter electrode (7) is formed on the emitter region (5), and a base electrode (8) is formed on the extrinsic base region (3a) extending outward from the intrinsic region (10) under the emitter electrode (7). Furthermore, a collector electrode (9) is formed on the collector region (1).

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

ホットエレクトロン・トランジスタ(6)の場合、ベー
ス領域(3)の厚さは数百人と非常に薄いので、移動度
の高い電子をキャリアとして用いても、ベース抵抗はあ
まり小さくならないという問題点がある。そこで、この
ような問題点を改善するためには、外部ベース領域(3
a)の線路抵抗をできるだけ小さくする必要があるが、
従来これを実現するための製法は未だ提案されていなか
った。
In the case of the hot electron transistor (6), the thickness of the base region (3) is extremely thin, measuring several hundreds, so even if high-mobility electrons are used as carriers, the base resistance does not become much smaller. be. Therefore, in order to improve these problems, the external base area (3
It is necessary to reduce the line resistance in a) as much as possible,
Until now, no manufacturing method has been proposed to achieve this.

本発明は、上述の点に鑑みて、外部ベース領域の線路抵
抗を小さくすることができるホットエレクトロン・トラ
ンジスタの製法を提供するものである。
In view of the above-mentioned points, the present invention provides a method for manufacturing a hot electron transistor that can reduce the line resistance of the external base region.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は、基板(11)上にコレクタm(12)、コレ
クタバリア層(13)、ベース層(14) 、エミッタ
バリア層(15)及びエミッタ領域(16)が形成され
て成るホットエレクトロン・トランジスタ(24)の製
法において、エミッタ領域(16)の側面と上面を絶縁
層(17)で被覆する工程と、絶縁!(17)で被覆さ
れていないエミッタバリア層(15)上に選択エピタキ
シャル成長でベース電極取出し部(19)を形成する工
程を有する。
The present invention provides a hot electron transistor in which a collector m (12), a collector barrier layer (13), a base layer (14), an emitter barrier layer (15), and an emitter region (16) are formed on a substrate (11). In the manufacturing method of (24), the step of covering the side and top surfaces of the emitter region (16) with an insulating layer (17) and the step of insulating! The method includes a step of forming a base electrode lead-out portion (19) by selective epitaxial growth on the emitter barrier layer (15) not covered with (17).

エミッタ領域(16)の側面を被覆する絶縁層(17)
は、エミッタ領域(16)上のみに絶縁層(17)を形
成した後、更に全面に絶縁層(17)を形成し、全面に
RIE  (反応性イオンエツチング)を施してエミッ
タ領域(16)の側面にサイドウオール(17a)を残
すことにより形成することができる。
An insulating layer (17) covering the sides of the emitter region (16)
After forming an insulating layer (17) only on the emitter region (16), an insulating layer (17) is further formed on the entire surface, and RIE (reactive ion etching) is performed on the entire surface to form the emitter region (16). It can be formed by leaving sidewalls (17a) on the sides.

〔作用〕[Effect]

ベース電極取出し部(19)形成のための選択エピタキ
シャル成長の際、絶縁層(17)がマスクとなり、工夫
ツタバリア層(15)上においてはこのサイドウオール
(17a)によってエミッタ領域(16)とベース電極
取出し部(19)との間の距離が規制されるため、エミ
ッタ領域(16)に近い位置にベース電極取出し部(1
9)を形成することが可能になる。従ってこれにより、
外部ベース領域(18)の線路抵抗の低減化を図ること
ができる。
During selective epitaxial growth to form the base electrode extraction portion (19), the insulating layer (17) serves as a mask, and on the ivy barrier layer (15), this sidewall (17a) allows the emitter region (16) and the base electrode extraction to be formed. Since the distance between the base electrode extraction portion (19) and the emitter region (16) is restricted, the base electrode extraction portion (19) is located close to the emitter region (16).
9). Therefore, with this,
The line resistance of the external base region (18) can be reduced.

(実施例〕 図面を参照して本発明の1実施例を説明する。(Example〕 One embodiment of the present invention will be described with reference to the drawings.

先ず第1図Aに示すように、半絶縁性GaAs基板(1
1)上にMOCVD (有機金属化学気相成長)法でコ
レクタ)i!1l(12)となるn” GaAs層(厚
さ0.8p m、n−5X10”ca−3)  (12
a ) 、コレ’)タハ’57Tf1(13)となるl
形^1 x Gat−xAs層(X−”0.3、厚さ0
.3p輪、不純物はドープせず)(13a)、ベース層
(14)となるn”GaAs層(厚さ0.05u va
、nm1O”cm−3)  (14a ) 、エミッタ
バリア層(15)となるl形AN x Gat−xAs
層(x−0,3,厚さ0.02μ餉)(15)及びエミ
ッタ領域(16) となるn“GaAs層(厚さ0.2
5/j II、nm 2 X IQ”cm−’ )  
(16a )を順次形成した後、この上に更に厚さ約1
μ戴の8th8N4層(17)を形成する。
First, as shown in FIG. 1A, a semi-insulating GaAs substrate (1
1) Collector) i! using MOCVD (metal organic chemical vapor deposition) method 1l(12) n" GaAs layer (thickness 0.8pm, n-5X10"ca-3) (12
a) , Kore') Taha'57Tf1(13)
Shape^1 x Gat-xAs layer (X-”0.3, thickness 0
.. 3p ring, no impurity doped) (13a), n'' GaAs layer (thickness 0.05u va) serving as the base layer (14).
, nm1O"cm-3) (14a), l-type AN x Gat-xAs which becomes the emitter barrier layer (15)
layer (x-0,3, thickness 0.02μ) (15) and emitter region (16).
5/j II, nm2XIQ"cm-')
After sequentially forming (16a), a further thickness of approximately 1
An 8th8N4 layer (17) of μ is formed.

次に第1図Bに示すように、エミッタ領域(16)に対
応する5iaN4層(17)上に形成したレジストをマ
スクとしてn”GaAs層(16a)fエツチングする
ことにより、エミッタ領域(16)を形部した後、全面
に厚さ0.25μ−の5iaN4層(17)を形成する
Next, as shown in FIG. 1B, by etching the n'' GaAs layer (16a) using the resist formed on the 5iaN4 layer (17) corresponding to the emitter region (16) as a mask, the emitter region (16) is etched. After shaping, a 5iaN4 layer (17) with a thickness of 0.25 μm is formed on the entire surface.

次に第1図Cに示すように、RIE  (反応性イオン
エツチング)を施してサイドウオール(17a )を形
成することによりエミッタ領域(16)の側面と上面を
Si3N4m (17) テ被覆した後、M g4−を
コレクタ層(12)となるn”GaAs層(12a)と
コレクタバリア層(13)となるl形^l・xGal−
xAs層(13a)の界面に10”3−3程度の濃度で
イオン注入し、更にSi+をエミッタバリアM(15)
となるi形AaGaAs層(15a )にイオン注入す
る。このMg+のイオン注入は、外部ベース領域(18
)直下のコレクタバリア層(13)をベース#(14)
及びコレクタ層(12)の導電形とは反対の導電形(p
形)とすることによって、外部ベース領域(18)直下
のコレクタ耐圧を向上させるために行うものである。な
お、このイオン注入の際、イオンの注入領域は、5ia
N4層(17)に規制されて形成される(所謂セルファ
ライン)。
Next, as shown in FIG. 1C, the side walls and top surface of the emitter region (16) are coated with Si3N4m (17) by performing RIE (reactive ion etching) to form sidewalls (17a). M g4- is formed into an n''GaAs layer (12a) which becomes the collector layer (12) and an l-type^l xGal- which becomes the collector barrier layer (13).
Ions are implanted into the interface of the xAs layer (13a) at a concentration of about 10"3-3, and Si+ is further added to the emitter barrier M (15).
Ions are implanted into the i-type AaGaAs layer (15a). This Mg+ ion implantation is performed in the external base region (18
) Based on the collector barrier layer (13) directly below # (14)
and a conductivity type (p) opposite to that of the collector layer (12).
This is done to improve the collector breakdown voltage directly under the external base region (18). Note that during this ion implantation, the ion implantation region is 5ia
It is regulated and formed by the N4 layer (17) (so-called self-line).

次に第1図りに示すように、MOCVD法でn”GaA
sを全面にエピタキシャル成長させて、ベース電極取出
し部(19)となる厚さ約0.3μ園のn”GaAs層
(n = 2 X 10”cm−’ )  (19a 
)を形成する。この際、n”GaAsは5iaN4層(
17)上には析出せず、Si3N4層(17)を除くl
形AlGaAs層(15)上のみに選択成長して、エミ
ッタ領域(16)に対するセルファライン化が図られる
。 n” GaAs層(19a)の5iaN 4 ji
F (17)と接する部分は、(111)面が現われて
斜面状となる。なお、注入されたMgとSiノ活性化は
、このエピタキシャル成長中に行なわれる。この後、B
+をイオン注入してベース・コレクタ分離領域(20)
を形成し、更にH+をイオン注入して素子分離領域(2
1)を形成する。
Next, as shown in the first diagram, n”GaA was
s is epitaxially grown on the entire surface to form an n" GaAs layer (n = 2 x 10" cm) (19a
) to form. At this time, n"GaAs is a 5iaN4 layer (
17) No precipitation on top, excluding Si3N4 layer (17)
By selectively growing only on the shaped AlGaAs layer (15), self-alignment of the emitter region (16) is achieved. 5iaN 4 ji of n” GaAs layer (19a)
At the part in contact with F (17), a (111) plane appears and becomes a slope. Note that the implanted Mg and Si are activated during this epitaxial growth. After this, B
+ ion implantation to create base/collector isolation region (20)
is formed, and further H+ ions are implanted to form an element isolation region (2
1) Form.

次に第1図已に示すように、一旦エミッタ領域(16)
上の5iaN4層(17)を除去した後、再度全面に厚
さ0.2tl raの5iaN4rf1(17)を形成
する。
Next, as shown in Figure 1, the emitter region (16)
After removing the upper 5iaN4 layer (17), 5iaN4rf1 (17) with a thickness of 0.2 tl ra is formed again on the entire surface.

この後、外部コレクタ電極形成領域における5iaN4
層(17)の窓開け、トレンチ(24)の形成、メタル
の埋め込みを行って外部コレクタ電極(21)を形成す
る。
After this, 5iaN4 in the external collector electrode formation region
An external collector electrode (21) is formed by opening a window in the layer (17), forming a trench (24), and filling the layer with metal.

最後に第1図Fに示すように、エミッタ電極形成領域と
ベース電極形成領域における5iaN4層(17)の窓
開けの後、エミッタ電極(22)とベース電極(23)
を形成して本発明に係るプレーナ型のホットエレクトロ
ン・トランジスタ(24)を完成する。
Finally, as shown in FIG.
is formed to complete the planar hot electron transistor (24) according to the present invention.

なお、第1図Cに示す工程において、SI+をイオン注
入しないで、表層の厚さ200人のAlGaAs層(1
5a)をエツチングで除去した後、第1図りに示す工程
に入っても良い。
In addition, in the step shown in FIG. 1C, an AlGaAs layer (1
After removing 5a) by etching, the process shown in the first diagram may be performed.

、〔発明の効果〕 本発明によれば、セルファラインにより外部ベース領域
(18)の一部となるベース電極取出し部(19)を形
成することができ、これにより線路長の短縮化、従って
線路批抗の低減化が可能になり、超高速のホットエレク
トロン・トランジスタ(24)が得られる。また、ベー
ス・コレクタ間耐圧を向上させるためにコレクタ層(1
2)を反対の導電形とするためのイオン注入は、エミッ
タ領域(16)を被覆する絶縁層(17)によってセル
ファラインで行うことができる。このように、本発明に
よりプレーナ型ホットエレクトロン・トランジスタの実
現が可能になる。
[Effects of the Invention] According to the present invention, the base electrode extraction portion (19) which becomes a part of the external base region (18) can be formed by the self-line, thereby shortening the line length and thus reducing the line length. It becomes possible to reduce resistance, and an ultra-high speed hot electron transistor (24) can be obtained. In addition, in order to improve the breakdown voltage between the base and collector, the collector layer (1
The ion implantation to make 2) the opposite conductivity type can be carried out in self-line by means of an insulating layer (17) covering the emitter region (16). Thus, the present invention enables the realization of planar hot electron transistors.

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

第1図A−Fは本実施例の工程図、第2図は従来例の断
面図である。 (11)は半絶縁性GaAs基板、(12)はコレクタ
層、(13)はコレクタバリア層、(14)はベース細
、(15)はエミッタバリア層、(16)はエミッタ領
域、(17)は5iaNn層、(19)はベース電極取
出し部、(24)はホットエレクトロン・トランジスタ
である。 出 願 人  工業技術院長 従来例θ断面図 第2図 寅幾例の 第1 工Pim 図
1A to 1F are process diagrams of this embodiment, and FIG. 2 is a sectional view of a conventional example. (11) is a semi-insulating GaAs substrate, (12) is a collector layer, (13) is a collector barrier layer, (14) is a base layer, (15) is an emitter barrier layer, (16) is an emitter region, (17) is a 5iaNn layer, (19) is a base electrode extraction portion, and (24) is a hot electron transistor. Applicant: Director of the Agency of Industrial Science and Technology

Claims (1)

【特許請求の範囲】  基板上にコレクタ層、コレクタバリア層、ベース層、
エミッタバリア層及びエミッタ領域が形成されて成るホ
ットエレクトロン・トランジスタの製法において、 エミッタ領域の側面と上面を絶縁層で被覆する工程と、 上記エミッタバリア層上に選択エピタキシャル成長でベ
ース電極取出し部を形成する工程を有することを特徴と
するホットエレクトロン・トランジスタの製法。
[Claims] A collector layer, a collector barrier layer, a base layer,
A method for manufacturing a hot electron transistor in which an emitter barrier layer and an emitter region are formed includes a step of covering the side and top surfaces of the emitter region with an insulating layer, and forming a base electrode extraction portion on the emitter barrier layer by selective epitaxial growth. 1. A method for manufacturing a hot electron transistor, comprising a process.
JP27977086A 1986-11-26 1986-11-26 Manufacture of hot-electron transistor Pending JPS63133570A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27977086A JPS63133570A (en) 1986-11-26 1986-11-26 Manufacture of hot-electron transistor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27977086A JPS63133570A (en) 1986-11-26 1986-11-26 Manufacture of hot-electron transistor

Publications (1)

Publication Number Publication Date
JPS63133570A true JPS63133570A (en) 1988-06-06

Family

ID=17615669

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27977086A Pending JPS63133570A (en) 1986-11-26 1986-11-26 Manufacture of hot-electron transistor

Country Status (1)

Country Link
JP (1) JPS63133570A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60164358A (en) * 1984-02-06 1985-08-27 Fujitsu Ltd Manufacture of semiconductor device
JPS6119167A (en) * 1984-07-05 1986-01-28 Fujitsu Ltd Semiconductor device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60164358A (en) * 1984-02-06 1985-08-27 Fujitsu Ltd Manufacture of semiconductor device
JPS6119167A (en) * 1984-07-05 1986-01-28 Fujitsu Ltd Semiconductor device

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