JPH0290538A - Manufacture of semiconductor device - Google Patents

Manufacture of semiconductor device

Info

Publication number
JPH0290538A
JPH0290538A JP24081188A JP24081188A JPH0290538A JP H0290538 A JPH0290538 A JP H0290538A JP 24081188 A JP24081188 A JP 24081188A JP 24081188 A JP24081188 A JP 24081188A JP H0290538 A JPH0290538 A JP H0290538A
Authority
JP
Japan
Prior art keywords
insulating film
source
reactive ion
ion etching
semiconductor
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
JP24081188A
Other languages
Japanese (ja)
Other versions
JP2670309B2 (en
Inventor
Toshihiko Hamazaki
浜崎 利彦
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP24081188A priority Critical patent/JP2670309B2/en
Publication of JPH0290538A publication Critical patent/JPH0290538A/en
Application granted granted Critical
Publication of JP2670309B2 publication Critical patent/JP2670309B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Electrodes Of Semiconductors (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • Thin Film Transistor (AREA)

Abstract

PURPOSE:To make the transistor size small by a method wherein the the sections of source.drain region ends are exposed to form metallic electrodes coming into contact only with the sections of the source.drain of a thin film SOI. CONSTITUTION:After depositing a silicon oxide film by CVD process, a sidewall 8 is formed by reactive ion etching process. First, an SOI layer 3 is etched away by reactive ion etching process using a sidewall 8 and a silicon oxide film 6 as masks to expose a source region edge face 9 and a drain region edge face 10. Secondly, tungstens 11, 11 are deposited respectively on the source edge face 9 and the drain edge face 10 by selective CVD process. Finally, a tungsten film 12 is deposited on the whole surface to be etched away by reactive ion etching process using a resist pattern so that a source electrode 13 and a drain electrode 14 may be formed.

Description

【発明の詳細な説明】 〔発明の目的〕 (産業上の利用分野) 本発明は半導体装置に関し、特番こ好ましくは、MO8
構造を有する超小型の半導体装置の製造方法に関するも
のである。
[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a semiconductor device, and preferably a special number MO8.
The present invention relates to a method of manufacturing an ultra-small semiconductor device having a structure.

(従来の技術) 80I(S目1con −On −In5ulator
 ) MO8) ラ7ジスタは、ラッチアップフリー、
ソフト耐性、低浮遊容量であるなど、バルクSi素子に
はない多くの利点を有している点で、今後の発展が期待
される素子である。
(Prior art) 80I (S eye 1con -On -In5ulator
) MO8) La7 register is latch-up free,
It is a device that is expected to develop in the future because it has many advantages that bulk Si devices do not have, such as soft resistance and low stray capacitance.

一方、薄いSOIMで形成したMOSFETにおいては
、従来の厚い80I膜を用いたMOS トランジスタに
対して、大幅な性能の改善がなされる事が示されている
On the other hand, it has been shown that MOSFETs formed using thin SOIM have significantly improved performance over conventional MOS transistors using thick 80I films.

この薄いSOI MOS )ランジスタを作製する上で
、ソース、ドレイン領域上の絶縁膜に電極接続孔を開孔
する際、反応性イオンエツチングを用いると、接続孔の
面積の制御は容易であるのに対して、深さ方向の制御が
困難となる。他方、湿式の化学エツチング法を用いると
、絶縁膜とSOI膜とのエツチングの選択性を得るのは
容易であるが、接続孔の面積の制御は困難となる。また
、電極接続孔を開孔する際、レジストマスクを用いてい
る為、レジストマスク形成工程が増加するばかりでなく
、ゲートと電極との位置関係iこ合わせ余裕が必要であ
り、素子の微細化の障害となっている。
In manufacturing this thin SOI MOS (MOS) transistor, when forming electrode connection holes in the insulating film over the source and drain regions, it is easy to control the area of the connection holes by using reactive ion etching. On the other hand, control in the depth direction becomes difficult. On the other hand, when a wet chemical etching method is used, it is easy to obtain etching selectivity between the insulating film and the SOI film, but it is difficult to control the area of the contact hole. In addition, since a resist mask is used when forming the electrode connection hole, not only does the process of forming the resist mask increase, but also a margin for alignment between the gate and the electrode is required, which leads to miniaturization of the device. has become an obstacle.

(発明が解決しようとする課題) 本発明の目的は、上記の点(こ鑑みて、薄膜80IMO
Sトランジスタにおけるソース、ドレインの電極を容易
に作製する事を可能とする新規な製造方法を提供するこ
とにある。
(Problems to be Solved by the Invention) The purpose of the present invention is to
An object of the present invention is to provide a new manufacturing method that allows easy manufacturing of source and drain electrodes in an S transistor.

〔発明の構成〕[Structure of the invention]

(課題を解決するための手段) 本発明の半導体装置の製造方法の要旨は、薄[1%SO
I MOS トランジスタのゲートをマスクとしてイオ
ン注入法により自己整合的にソース、ドレイン領域を形
成し、続いて、ゲート及び、ゲート側壁部に絶縁膜で形
成したサイドウオールをマスクとして反応性イオンエツ
チングによって自己整合的にソース、ドレイン領域端部
の断面を露出させ、薄膜80Iのソース及びドレインの
断面においてのみ接触する金、mtt極を形成する工程
を含む事にある。
(Means for Solving the Problems) The gist of the method for manufacturing a semiconductor device of the present invention is to
The source and drain regions are formed in a self-aligned manner by ion implantation using the gate of the IMOS transistor as a mask, and then self-alignment is performed by reactive ion etching using the gate and sidewalls formed with an insulating film on the side walls of the gate as masks. This method includes the step of exposing the cross sections of the end portions of the source and drain regions in a consistent manner and forming gold mtt electrodes that contact only the cross sections of the source and drain of the thin film 80I.

(作用) 上記工程を薄[SOIのMOS トランジスタの製造工
程に含める事によって、従来と違って、電極接続孔開孔
の為の、レジストマスク形成工程が不用となる。SOI
層の断面において電極と接触させる構造である為、該断
面を露出させる際、オーバーエツチングに対するエツチ
ング時間の制御が容易となる。平面的な金属−半導体接
触面が不用となる為、トランジスタサイズを著しく縮少
する事ができる。
(Function) By including the above process in the manufacturing process of a thin SOI MOS transistor, unlike the conventional method, a resist mask forming process for forming electrode connection holes becomes unnecessary. SOI
Since the structure is such that the cross section of the layer is brought into contact with the electrode, it is easy to control the etching time to prevent overetching when exposing the cross section. Since planar metal-semiconductor interfaces are no longer required, transistor size can be significantly reduced.

(実施例) 本発明の実施例を第1図(a)〜(h)を使って詳細に
説明する。
(Example) An example of the present invention will be described in detail using FIGS. 1(a) to (h).

第1図(a)に示すように、シリコン基板1上に8 I
 MOX (Separat ion by Impl
anted Oxy、gen )法を用いて、厚さ0.
4μ、91の狸め込みSiH2層2を形成し、その上に
PIJlのシリコン基板1上3を膜厚750人で形成す
る。
As shown in FIG. 1(a), 8 I
MOX (Separation by Impl)
using the anted Oxy, gen) method to a thickness of 0.
A SiH 2 layer 2 with a thickness of 4 μm and 91 mm is formed, and a silicon substrate 1 3 of PIJI is formed thereon to a thickness of 750 mm.

次に第1図(b)に示すように、SOIOsO4面に、
熱酸化法により、厚さ500Aのシリコン酸化膜4を形
成する。
Next, as shown in FIG. 1(b), on the SOIOsO4 surface,
A silicon oxide film 4 having a thickness of 500 Å is formed by thermal oxidation.

次に第1図(C)に示すように、厚さ0.4μmの燐を
添加した多結晶シリコン5を堆積する。この場合、多結
晶シリコンに代えて金属でもよい。続いてこの多結晶シ
リコン5上に厚さ6000Aμmのシリコン酸化gf5
を堆積した後、所望の大きさにパターンマスクを用いて
エツチングする。
Next, as shown in FIG. 1C, 0.4 μm thick polycrystalline silicon 5 doped with phosphorus is deposited. In this case, metal may be used instead of polycrystalline silicon. Next, silicon oxide gf5 with a thickness of 6000 Aμm is deposited on this polycrystalline silicon 5.
After depositing, it is etched to the desired size using a pattern mask.

続いて、燐イオンを注入し、熱処理する事によって、限
定された領域7を除いてSOI層3をN型に変える。
Subsequently, by implanting phosphorus ions and performing heat treatment, the SOI layer 3 except for a limited region 7 is changed to N type.

次に第1図(d)に示すように、シリコン酸化膜を化学
的気相成長法により堆積した後、反応性イオンエツチン
グによりサイドウオール8を形成する。
Next, as shown in FIG. 1(d), a silicon oxide film is deposited by chemical vapor deposition, and then sidewalls 8 are formed by reactive ion etching.

次に第1図(e) 4こ示すように、サイドウオール8
゜シリコン酸化膜6をマスクとして、反応性イオンエツ
チングによりSOIOsO4ツチングし、ソース領域端
面9.ドレイン領域端面1oを露出させる。
Next, as shown in Figure 1(e), the side wall 8
Using the silicon oxide film 6 as a mask, SOIOsO4 is etched by reactive ion etching, and the end face 9 of the source region is etched. The end face 1o of the drain region is exposed.

次に第1図(f)に示すように、WF6及びSiM、の
混合ガスを親ガスとして選択的化学気相成長法を用いて
、ソース端面9及びソース端面1oに、タングステン1
1.11’を成長させる。
Next, as shown in FIG. 1(f), using a selective chemical vapor deposition method using a mixed gas of WF6 and SiM as a parent gas, tungsten 1
Grow 1.11'.

次に第1図(g)に示すように、WF、及びSiH,の
混合ガス比を変化させて、全面にタングステン膜12を
堆積させる。
Next, as shown in FIG. 1(g), a tungsten film 12 is deposited on the entire surface while changing the mixed gas ratio of WF and SiH.

次に第1図(h)に示すように、レジストパターンを用
いて反応性イオンエツチングによりタングステン膜12
をエツチングし、ソース電極13.ド【/イン′に甑1
4を形成する。
Next, as shown in FIG. 1(h), the tungsten film 12 is etched by reactive ion etching using a resist pattern.
The source electrode 13. is etched. Do[/in'ni koshiki 1
form 4.

以上が本発明の一実施例の製造方法である。The above is the manufacturing method of one embodiment of the present invention.

〔発明の効果〕〔Effect of the invention〕

本発明による工程を、半導体装置の炸裂工程に含めるな
らば、特に薄膜80IのMOS )ランジスタにおいて
、SOI層の断面において、電極と接触させる構造であ
る為、該断面を露出させる際、オーバーエツチングに対
するエツチング時間の制御が容易となる。さらに、平面
的な金属−半導体接触面が不用となる為、トランジスタ
サイズを著しく縮少する事ができる。
If the process according to the present invention is included in the explosion process of a semiconductor device, especially in a thin film 80I MOS transistor, since the cross section of the SOI layer is in contact with the electrode, when exposing the cross section, it is necessary to prevent over etching. Etching time can be easily controlled. Furthermore, since a planar metal-semiconductor contact surface is no longer required, the transistor size can be significantly reduced.

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

第1図は本発明による薄膜SOI・MOSトランジスタ
を製造する工程説明図である。 1・・・シリコン基板、2・・・シリコン酸化膜。 3・・・単結晶シリコン膜。 4・・・シリコン酸化膜。 5・・・多結晶シリコンゲート。 6・・・シリコン酸化膜。 8・・・シリコン酸化膜サイドウオール。 9・・・SOIソース領域端面。 10・・・SOI ドレイン領域端面。 11、11’・・・タングステン。 12・・・タングステン膜。 13・・・ソース電極。 14・・・ドレイン1を極。 代理人 弁理士 則 近 憲 佑 同      松  山  光  之 @ l 囚 第  1  図
FIG. 1 is an explanatory diagram of a process for manufacturing a thin film SOI/MOS transistor according to the present invention. 1... Silicon substrate, 2... Silicon oxide film. 3... Single crystal silicon film. 4...Silicon oxide film. 5... Polycrystalline silicon gate. 6...Silicon oxide film. 8...Silicon oxide film side wall. 9...SOI source region end face. 10...SOI drain region end face. 11, 11'...Tungsten. 12...Tungsten film. 13... Source electrode. 14... Drain 1 is the pole. Agent Patent Attorney Noriyuki Ken Yudo Mitsuru Matsuyama @ l Prisoner Figure 1

Claims (1)

【特許請求の範囲】[Claims] 半導体基板の一主面上に第1の絶縁膜を形成したのち、
この第1の絶縁膜上の限定された領域に第1導電型の半
導体単結晶層を形成する工程と、続いて、前記半導体単
結晶層の表面に酸化膜を形成した後、該酸化膜上の一部
の限定された領域の一部から前記第1の絶縁膜の一部に
またがるように、金属あるいは低抵抗半導体及び絶縁膜
を積層して形成する工程と、該金属あるいは低抵抗半導
体をマスクとしてイオン注入技術により該限定された領
域の下部を除いて、上記半導体単結晶層の一部を第2導
電型に変化せしめる工程と、続いて第2の絶縁膜を全面
に堆積した後、反応性イオンエッチングにより、前記金
属あるいは低抵抗半導体の側壁部周辺と残して、該第2
の絶縁膜をエッチングし、サイドウォールを形成する工
程と、続いて、前記金属あるいは低抵抗半導体及び前記
サイドウォールをマスクとして反応性イオンエッチング
により、前記第2導電型の半導体単結晶を除去する工程
と、続いて、化学的気相成長法を用いて、金属を全面に
堆積したのち、レジストマスクを用いて、反応性イオン
エッチングにより前記半導体単結晶層に接触する領域を
電極として残してエッチングする工程とを含む事を特徴
とする半導体装置の製造方法。
After forming the first insulating film on one main surface of the semiconductor substrate,
A step of forming a semiconductor single crystal layer of a first conductivity type in a limited region on the first insulating film, followed by forming an oxide film on the surface of the semiconductor single crystal layer, and then forming an oxide film on the surface of the semiconductor single crystal layer. a step of stacking and forming a metal or a low-resistance semiconductor and an insulating film so as to span from a part of a limited region of the first insulating film to a part of the first insulating film; A step of changing a part of the semiconductor single crystal layer to the second conductivity type except for the lower part of the limited region using ion implantation technology as a mask, and then depositing a second insulating film over the entire surface, By reactive ion etching, the second layer is removed, leaving the periphery of the side wall of the metal or low-resistance semiconductor.
a step of etching the insulating film to form a sidewall, and then a step of removing the second conductivity type semiconductor single crystal by reactive ion etching using the metal or low resistance semiconductor and the sidewall as a mask. Then, after depositing metal on the entire surface using chemical vapor deposition, etching is performed using a resist mask by reactive ion etching, leaving the region in contact with the semiconductor single crystal layer as an electrode. 1. A method for manufacturing a semiconductor device, comprising the steps of:
JP24081188A 1988-09-28 1988-09-28 Method for manufacturing semiconductor device Expired - Fee Related JP2670309B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24081188A JP2670309B2 (en) 1988-09-28 1988-09-28 Method for manufacturing semiconductor device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24081188A JP2670309B2 (en) 1988-09-28 1988-09-28 Method for manufacturing semiconductor device

Publications (2)

Publication Number Publication Date
JPH0290538A true JPH0290538A (en) 1990-03-30
JP2670309B2 JP2670309B2 (en) 1997-10-29

Family

ID=17065037

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24081188A Expired - Fee Related JP2670309B2 (en) 1988-09-28 1988-09-28 Method for manufacturing semiconductor device

Country Status (1)

Country Link
JP (1) JP2670309B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0664566A1 (en) * 1994-01-19 1995-07-26 Sony Corporation MOS transistor and method for making the same
JP2007531257A (en) * 2004-03-25 2007-11-01 コミサリア、ア、レネルジ、アトミク Method of manufacturing field effect transistor having diamond-like carbon channel, and transistor manufactured by the manufacturing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0664566A1 (en) * 1994-01-19 1995-07-26 Sony Corporation MOS transistor and method for making the same
JP2007531257A (en) * 2004-03-25 2007-11-01 コミサリア、ア、レネルジ、アトミク Method of manufacturing field effect transistor having diamond-like carbon channel, and transistor manufactured by the manufacturing method

Also Published As

Publication number Publication date
JP2670309B2 (en) 1997-10-29

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