JPH05267325A - Manufacture of mis transistor - Google Patents

Manufacture of mis transistor

Info

Publication number
JPH05267325A
JPH05267325A JP6051792A JP6051792A JPH05267325A JP H05267325 A JPH05267325 A JP H05267325A JP 6051792 A JP6051792 A JP 6051792A JP 6051792 A JP6051792 A JP 6051792A JP H05267325 A JPH05267325 A JP H05267325A
Authority
JP
Japan
Prior art keywords
layer
low
concentration
implanted
concentration ion
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.)
Withdrawn
Application number
JP6051792A
Other languages
Japanese (ja)
Inventor
Katsuya Kuniyoshi
克哉 国吉
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.)
Nippon Precision Circuits Inc
Original Assignee
Nippon Precision Circuits Inc
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 Nippon Precision Circuits Inc filed Critical Nippon Precision Circuits Inc
Priority to JP6051792A priority Critical patent/JPH05267325A/en
Publication of JPH05267325A publication Critical patent/JPH05267325A/en
Withdrawn legal-status Critical Current

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  • Insulated Gate Type Field-Effect Transistor (AREA)

Abstract

PURPOSE:To simplify the manufacturing process of a MIS transistor provided with an LDD structure. CONSTITUTION:(A) A gate insulating layer 12 and a conductive layer 13 are formed on a silicon substrate 11; a photoresist layer 14 whose sidewall is taper- shaped is formed. (B) Impurities are ion-implanted; a low-concentration ion- implanted layer 15 is formed at the lower part of the sidewall of the photoresist layer 14; a high-concentration ion-implanted layer 16 is formed at the outside of the low-concentration ion-implanted layer 15. (C) The conductive layer 13 is etched by an anisotropic dry etching operation by making use of the photoresist layer 14 as a mask; a gate electrode 13a is formed. (D) The impurities are activated by a heat treatment; a low-concentration diffusion layer 15a and a high-concentration diffusion layer 16a are formed.

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、LDD(ライトリ ド
―プト ドレイン)構造を有するMISトランジスタの
製造方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a MIS transistor having an LDD (write-drain drain) structure.

【0002】[0002]

【従来の技術】図2は、従来例を示した説明図であり、
LDD構造を有するMISトランジスタの製造方法を示
した図である。
2. Description of the Related Art FIG. 2 is an explanatory view showing a conventional example.
FIG. 6 is a diagram showing a method of manufacturing an MIS transistor having an LDD structure.

【0003】31はシリコン基板、32はゲ―ト絶縁
層、33はゲ―ト電極、34は絶縁層、35はLDD構
造を形成するための絶縁層である。36は低濃度イオン
注入層、36aはこの低濃度イオン注入層36を活性化
した低濃度拡散層、37は高濃度イオン注入層、37a
はこの高濃度イオン注入層37を活性化した高濃度拡散
層である。
Reference numeral 31 is a silicon substrate, 32 is a gate insulating layer, 33 is a gate electrode, 34 is an insulating layer, and 35 is an insulating layer for forming an LDD structure. Reference numeral 36 denotes a low-concentration ion implantation layer, 36a denotes a low-concentration diffusion layer that activates the low-concentration ion implantation layer 36, 37 denotes a high-concentration ion implantation layer, and 37a.
Is a high-concentration diffusion layer obtained by activating the high-concentration ion implantation layer 37.

【0004】つぎに、図2(A)〜(C)にしたがって
製造方法の説明を行う。
Next, the manufacturing method will be described with reference to FIGS.

【0005】(A)ゲ―ト電極33をマスクとして不純
物のイオン注入を行い、低濃度イオン注入層36を形成
する。
(A) Impurity ions are implanted by using the gate electrode 33 as a mask to form a low concentration ion implantation layer 36.

【0006】(B)絶縁層35を形成し、この絶縁層3
5およびゲ―ト電極33をマスクとして不純物のイオン
注入を行い、高濃度イオン注入層37を形成する。
(B) The insulating layer 35 is formed, and the insulating layer 3 is formed.
Ion implantation of impurities is performed by using 5 and the gate electrode 33 as a mask to form a high concentration ion implantation layer 37.

【0007】(D)熱処理により不純物の活性化を行
い、低濃度拡散層36aおよび高濃度拡散層37aを形
成する。
(D) The impurities are activated by heat treatment to form the low concentration diffusion layer 36a and the high concentration diffusion layer 37a.

【0008】[0008]

【発明が解決しようとする課題】上記従来の方法では、
2度のイオン注入工程、絶縁層35の形成工程等、製造
工程が複雑になるという問題点があった。
SUMMARY OF THE INVENTION In the above conventional method,
There is a problem in that the manufacturing process is complicated, such as the ion implantation process twice and the insulating layer 35 forming process.

【0009】本発明の目的は、LDD構造を有するMI
Sトランジスタにおいて、その製造工程を簡略化するこ
とである。
An object of the present invention is to have an MI having an LDD structure.
It is to simplify the manufacturing process of the S-transistor.

【0010】[0010]

【課題を解決するための手段】本発明のMISトランジ
スタの製造方法は、側壁がテ―パ―状のレジスト層をマ
スクとして不純物をイオン注入することにより、レジス
ト層の側壁下部に低濃度イオン注入層をこの低濃度イオ
ン注入層の外側に高濃度イオン注入層を同時に形成する
とともに、上記レジスト層をゲ―ト電極形成のマスクと
して用いるものである。
According to a method of manufacturing a MIS transistor of the present invention, impurities are ion-implanted using a resist layer having a taper side wall as a mask, so that low-concentration ion implantation is performed below the side wall of the resist layer. A layer is formed simultaneously with a high concentration ion implantation layer outside the low concentration ion implantation layer, and the resist layer is used as a mask for forming a gate electrode.

【0011】[0011]

【実施例】図1は、本発明の実施例を示した説明図であ
り、LDD構造を有するMISトランジスタの製造方法
を示した図である。
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view showing an embodiment of the present invention, showing a method of manufacturing a MIS transistor having an LDD structure.

【0012】11はシリコン基板、12は熱酸化シリコ
ンを用いたゲ―ト絶縁層(層厚は10〜50nm程度)
である。13はポリシリコンを用いた導電層(層厚は1
00〜500nm程度)、13aはこの導電層13をエ
ッチングして形成されたゲ―ト電極である。14はフォ
トレジスト層であり、図1に示すように側壁がテ―パ―
状となっている。15は低濃度イオン注入層、15aは
この低濃度イオン注入層15を活性化した低濃度拡散層
である。16は高濃度イオン注入層、16aはこの高濃
度イオン注入層16を活性化した高濃度拡散層である。
Reference numeral 11 is a silicon substrate, and 12 is a gate insulating layer using thermally oxidized silicon (layer thickness is about 10 to 50 nm).
Is. 13 is a conductive layer using polysilicon (layer thickness is 1
Reference numeral 13a is a gate electrode formed by etching the conductive layer 13. 14 is a photoresist layer, the side walls of which are tapered as shown in FIG.
It is in a state. Reference numeral 15 is a low-concentration ion implantation layer, and 15a is a low-concentration diffusion layer that activates the low-concentration ion implantation layer 15. Reference numeral 16 is a high-concentration ion implantation layer, and 16a is a high-concentration diffusion layer that activates the high-concentration ion implantation layer 16.

【0013】つぎに、図1(A)〜(D)にしたがって
製造方法の説明を行う。
Next, the manufacturing method will be described with reference to FIGS.

【0014】(A)シリコン基板11上にゲ―ト絶縁層
12および導電層13を形成した後、導電層13上に側
壁がテ―パ―状のフォトレジスト層14を形成する。
(A) After the gate insulating layer 12 and the conductive layer 13 are formed on the silicon substrate 11, a photoresist layer 14 having a taper side wall is formed on the conductive layer 13.

【0015】(B)不純物を所定の加速電圧でイオン注
入し、フォトレジスト層14の側壁下部に対応して低濃
度イオン注入層15を、この低濃度イオン注入層15の
外側に高濃度イオン注入層16を形成する。すなわち、
単一のイオン注入工程により、低濃度イオン注入層15
および高濃度イオン注入層16が同時に形成されること
になる。フォトレジスト層14の側壁下部では、内側に
向かって徐々に不純物濃度が低くなっている。
(B) Impurities are ion-implanted at a predetermined acceleration voltage to form a low-concentration ion-implanted layer 15 corresponding to the lower portion of the side wall of the photoresist layer 14, and a high-concentration ion-implanted outside the low-concentration ion-implanted layer 15. Form layer 16. That is,
The low concentration ion implantation layer 15 is formed by a single ion implantation process.
And the high concentration ion implantation layer 16 is formed at the same time. In the lower portion of the sidewall of the photoresist layer 14, the impurity concentration gradually decreases toward the inside.

【0016】(C)上記フォトレジスト層14をマスク
とした異方性ドライエッチングにより導電層13をエッ
チングし、ゲ―ト電極13aを形成する。エッチング終
了後、フォトレジスト層14を除去する。このように、
フォトレジスト層14をイオン注入のマスクおよびゲ―
ト電極形成のマスクとして共用することにより、ゲ―ト
電極13aのエッジを境にして、低濃度イオン注入層1
5と高濃度イオン注入層16とが形成されることにな
る。
(C) The conductive layer 13 is etched by anisotropic dry etching using the photoresist layer 14 as a mask to form a gate electrode 13a. After the etching is completed, the photoresist layer 14 is removed. in this way,
The photoresist layer 14 is used as an ion implantation mask and gate.
The low-concentration ion-implanted layer 1 is formed with the edge of the gate electrode 13a as a boundary by being shared as a mask for forming the gate electrode
5 and the high concentration ion implantation layer 16 are formed.

【0017】(D)熱処理により不純物の活性化を行
い、低濃度イオン注入層15に対応して低濃度拡散層1
5aを、高濃度イオン注入層16に対応して高濃度拡散
層16aを形成する。いうまでもないが、高濃度拡散層
16aはMISトランジスタのソ―ス/ドレインとなる
ものである。
(D) The impurities are activated by heat treatment, and the low-concentration diffusion layer 1 corresponding to the low-concentration ion-implanted layer 15 is formed.
5a, a high concentration diffusion layer 16a corresponding to the high concentration ion implantation layer 16 is formed. Needless to say, the high concentration diffusion layer 16a serves as the source / drain of the MIS transistor.

【0018】[0018]

【発明の効果】本発明では、側壁がテ―パ―状のレジス
ト層をイオン注入のマスクおよびゲ―ト電極形成のマス
クとして用いることにより、低濃度イオン注入層と高濃
度イオン注入層とを同時に形成するため、製造工程を大
幅に簡略化できる。
According to the present invention, the low-concentration ion-implanted layer and the high-concentration ion-implanted layer are formed by using the resist layer having the tapered side wall as the mask for ion implantation and the mask for forming the gate electrode. Since they are formed at the same time, the manufacturing process can be greatly simplified.

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

【図1】本発明の実施例を示した説明図である。FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

【図2】従来例を示した説明図である。FIG. 2 is an explanatory diagram showing a conventional example.

【符号の説明】 11……シリコン基板 13……導電層 13a…ゲ―ト電極 14……フォトレジスト層 15……低濃度イオン注入層 16……高濃度イオン注入層[Explanation of reference numerals] 11 ... Silicon substrate 13 ... Conductive layer 13a ... Gate electrode 14 ... Photoresist layer 15 ... Low-concentration ion implantation layer 16 ... High-concentration ion implantation layer

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 半導体基板の主面側に導電層を形成する
工程と、 上記導電層上に側壁がテ―パ―状のレジスト層を形成す
る工程と、 上記レジスト層をマスクとして上記半導体基板に不純物
をイオン注入することにより、上記レジスト層の側壁下
部に低濃度イオン注入層をこの低濃度イオン注入層の外
側に高濃度イオン注入層を同時に形成する工程と、 上記レジスト層をマスクとして上記導電層をエッチング
することによりゲ―ト電極を形成する工程とを有するこ
とを特徴とするMISトランジスタの製造方法。
1. A step of forming a conductive layer on a main surface side of a semiconductor substrate, a step of forming a resist layer having a taper side wall on the conductive layer, and the semiconductor substrate using the resist layer as a mask. A step of simultaneously forming a low-concentration ion-implanted layer on the lower side wall of the resist layer by ion-implanting impurities into the outer side of the low-concentration ion-implanted layer, and using the resist layer as a mask. And a step of forming a gate electrode by etching the conductive layer.
JP6051792A 1992-03-17 1992-03-17 Manufacture of mis transistor Withdrawn JPH05267325A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6051792A JPH05267325A (en) 1992-03-17 1992-03-17 Manufacture of mis transistor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6051792A JPH05267325A (en) 1992-03-17 1992-03-17 Manufacture of mis transistor

Publications (1)

Publication Number Publication Date
JPH05267325A true JPH05267325A (en) 1993-10-15

Family

ID=13144595

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6051792A Withdrawn JPH05267325A (en) 1992-03-17 1992-03-17 Manufacture of mis transistor

Country Status (1)

Country Link
JP (1) JPH05267325A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6107148A (en) * 1998-10-26 2000-08-22 Nippon Steel Semiconductor Corporation Method for fabricating a semiconductor device
KR100447980B1 (en) * 2002-12-10 2004-09-10 주식회사 하이닉스반도체 Method of manufacturing semiconductor device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6107148A (en) * 1998-10-26 2000-08-22 Nippon Steel Semiconductor Corporation Method for fabricating a semiconductor device
KR100447980B1 (en) * 2002-12-10 2004-09-10 주식회사 하이닉스반도체 Method of manufacturing semiconductor device

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Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 19990518