JPS6184065A - Manufacture of thin film transistor - Google Patents

Manufacture of thin film transistor

Info

Publication number
JPS6184065A
JPS6184065A JP20411384A JP20411384A JPS6184065A JP S6184065 A JPS6184065 A JP S6184065A JP 20411384 A JP20411384 A JP 20411384A JP 20411384 A JP20411384 A JP 20411384A JP S6184065 A JPS6184065 A JP S6184065A
Authority
JP
Japan
Prior art keywords
electrode
gate
gate electrode
layer
film
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
JP20411384A
Other languages
Japanese (ja)
Inventor
Tsutomu Nomoto
野本 勉
Mamoru Yoshida
守 吉田
Tsukasa Watanabe
渡辺 宦
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP20411384A priority Critical patent/JPS6184065A/en
Publication of JPS6184065A publication Critical patent/JPS6184065A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
    • H01L29/76Unipolar devices, e.g. field effect transistors
    • H01L29/772Field effect transistors
    • H01L29/78Field effect transistors with field effect produced by an insulated gate
    • H01L29/786Thin film transistors, i.e. transistors with a channel being at least partly a thin film
    • H01L29/78606Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
    • H01L29/78636Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device with supplementary region or layer for improving the flatness of the device
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H01L29/40Electrodes ; Multistep manufacturing processes therefor
    • H01L29/43Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
    • H01L29/49Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET
    • H01L29/4908Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET for thin film semiconductor, e.g. gate of TFT

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Ceramic Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Electrodes Of Semiconductors (AREA)

Abstract

PURPOSE:To eliminate the step difference in the structure of a thin film transistor and to inhibit the leakage current between the gate and the source electrodes and that between the gate and drain electrodes by a method wherein a metal layer, which is used as the material for the gate electrode, is coated on the whole surface of the substrate, parts of the metal layer other than the metal layer at the programming region for forming the gate electrode are oxidized, a part only of the metal layer, which is used as the material for the gate electrode, is made to remain, and after that, the gate oxide film, the semiconductor thin film layers, the source electrode, the drain electrode and so forth are provided. CONSTITUTION:A Ta film, which is used as the material for the gate electrode, is coated on the surface of an insulative substrate 1 consisting of glass or quartz, the region of the gate electrode 3 is covered with a resist film, the exposing parts of the Ta film are anodized using a solution containing oxalic acid or so forth and are turned into Ta2O5 insulating layers 2. Then, the resist film, which becomes unnecessary, is removed, a gate insulating layer 4 is coated extending from the upper part of the electrode 3 to the upper parts of the edge parts of the layers 2 encircling the electrode 3, and a channel layer 5 is formed thereon. After that, a source electrode 7 and a drain electrode 8 are mounted on the layer 5 through low-resistance amorphous Si layers 6. By such a way, the flat gate electrode is obtained, thereby enabling to lessen microscopically the leakage current between the gate and source electrodes and that between the gate and drain electrodes.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は薄膜トラン2スタ(以下TPTと略す)の製造
方法に関するものである。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a thin film transistor (hereinafter abbreviated as TPT).

(従来の技術) TPTは一般に、例えば特開昭58−32468号公報
に示されているように、基板上に直接ゲート電極を形成
した構造となっている。このようなTPTを製造する場
合には、通常、まずガラス基板又はアルミナ基板上に、
ニクロム(NiCr ) 、タングステン(W)、モリ
ブデン(Mo ) 、クロム(Cr )等よりなるゲー
ト電極金属層を電子ビーム蒸着法またはスパッタ法によ
シ被着形成し、所定のパターンに加工してケゝ−ト電極
を形成する。次いで、その上にゲート絶縁層となるンリ
コン酸化(5inX)膜またはシリコン窒化(5iNx
)膜をそれぞれ、N20と5iH4r NH5とS I
H4を主成分ガ゛スとしてグロー放電法により堆積させ
、さらにチャンネル層(活性層)となる、非晶質7リコ
ン半導体層をS IH4のグロー放電法によシ堆積させ
る。
(Prior Art) TPT generally has a structure in which a gate electrode is formed directly on a substrate, as shown in, for example, Japanese Patent Laid-Open No. 58-32468. When manufacturing such TPT, usually, first, on a glass substrate or alumina substrate,
A gate electrode metal layer made of nichrome (NiCr), tungsten (W), molybdenum (Mo), chromium (Cr), etc. is deposited by electron beam evaporation or sputtering, and processed into a predetermined pattern. Form a second electrode. Next, a silicon oxide (5inX) film or a silicon nitride (5inX) film is formed on it to become a gate insulating layer.
) membranes, respectively, N20 and 5iH4r NH5 and S I
H4 is deposited as a main component gas by a glow discharge method, and an amorphous 7-licon semiconductor layer, which will become a channel layer (active layer), is further deposited by a SIH4 glow discharge method.

さらに、低抵抗非晶質/リコン層となるr層を主成分ガ
スのS IH4中へ0.]〜1.0%程度のPH3を混
合してグロー放電法によって堆積する。
Furthermore, the r-layer, which will become a low-resistance amorphous/recon layer, is immersed into the main component gas SIH4. ]~1.0% of PH3 is mixed and deposited by glow discharge method.

次にTPTとなる部分以外は加工し除去して、島状にパ
ターンニングしゲート絶縁層とチャンネル層を形成する
Next, the portion other than the portion that will become the TPT is processed and removed and patterned into an island shape to form a gate insulating layer and a channel layer.

次に、ソース電極、ドレイン電極となるアルミ(At)
層を真空蒸着法と加工によシ形成する。
Next, aluminum (At) will be used as the source and drain electrodes.
The layer is formed by vacuum deposition and processing.

(発明が解決しようとする問題点) しかしながら、このような製法ではゲート電極による段
差のためゲート電極とノース1翫、またはゲート電極と
ドレイン電極間のリークが発生しやすいので、ゲート絶
縁膜を厚くする必要があった。
(Problem to be solved by the invention) However, in this manufacturing method, leakage easily occurs between the gate electrode and the north electrode or between the gate electrode and the drain electrode due to the step difference caused by the gate electrode, so the gate insulating film is made thicker. I needed to.

本発明の目的は、ゲート電極での段差を解消することに
よって、信頼性の高いTFTを歩留9良く製造すること
にある。 □ (問題点を解決するための手段〕 本発明は、まず基板要部全表面にゲート電極材としての
金属を被着し、次いで、その金属層をゲート電極予定領
域を除いて酸化することによってゲート電極を形成し、
その後ゲート酸化膜、半導体薄膜層を被着し、またソー
ス電極及びドレイン電極を形成するようにしたものであ
る。
An object of the present invention is to manufacture a highly reliable TFT with a high yield of 9 by eliminating the step difference in the gate electrode. □ (Means for solving the problem) The present invention first deposits a metal as a gate electrode material on the entire surface of the main part of the substrate, and then oxidizes the metal layer except for the area where the gate electrode is planned. forming a gate electrode;
After that, a gate oxide film and a semiconductor thin film layer are deposited, and a source electrode and a drain electrode are formed.

(作用) このように、ゲート電極となる部分以外を酸化すること
によってゲート電極を選択的に形成しているため、段差
のない構造となシ、比較的薄いゲート酸化膜で、ゲート
電極とソース電極間のリーク電流などをおさえることが
でき、信頼性を高めることができる。
(Function) In this way, since the gate electrode is selectively formed by oxidizing the part other than the part that will become the gate electrode, a structure with no steps is created, and a relatively thin gate oxide film is used to form the gate electrode and the source. Leakage current between electrodes can be suppressed, and reliability can be improved.

(実施例) 1ず、ガラス基板または石英基板1上の要部全面に、電
子ビーム蒸着法あるいはスパッタ法によりメンタル(T
a)膜を100〜1000λ被着形成する。
(Example) 1. First, a mental (T
a) Depositing a film with a thickness of 100 to 1000λ.

その後、レノスト等でゲート電極となる部分のみをおお
ったパターンニング加工を行い、そののち蒸留水にし乃
う酸を添加した溶液中に入れ、メンタル側を陽極として
数十〜数百ボルトの直流電圧を印加することで陽極酸化
(化成)を行ない、露出したタンタル部分全体を五酸化
タンタル(Ta205)とし絶縁層2とする。
After that, a patterning process is performed to cover only the part that will become the gate electrode using Lennost, etc., and then it is placed in a solution of distilled water and acid added, and a DC voltage of several tens to hundreds of volts is applied with the mental side as the anode. is applied to perform anodic oxidation (chemical conversion), and the entire exposed tantalum portion is converted into tantalum pentoxide (Ta205) to form the insulating layer 2.

その後、不用となったレノスト等を除去することで、所
定のパターンに形成されたr−)電極3が形成される。
Thereafter, the r-) electrode 3 formed in a predetermined pattern is formed by removing unnecessary renost and the like.

その後、通例の方法に従って、ゲート絶縁層3、チャン
ネル層4、低抵抗非晶質ンリコン膜5、ノース電極6、
ドレイン電極7を形成することでTPTが完成する。
Thereafter, according to the usual method, a gate insulating layer 3, a channel layer 4, a low resistance amorphous silicon film 5, a north electrode 6,
The TPT is completed by forming the drain electrode 7.

ゲート金属の酸化法としては、陽翫酸化法のほかに、0
□プラズマによるプラズマ酸化法を用いても同様のこと
が可能である。
In addition to the positive oxidation method, gate metal oxidation methods include
□The same thing can be done using a plasma oxidation method using plasma.

またケ゛〜ト電極金属とし7てタンタルを用いたが、チ
タン(Ti )または、アルミニウム(At)またはり
/ゲステン(W)をゲート電極の材料として用い、不用
の部分をそれぞれ陽甑酸化寸たはプラズマ酸化して、そ
れぞれチタン酸化物層(TlO2)、アルミニウム酸化
物層(At203)、タングステン酸化物層(罰、)を
形成しても同様にTPTが完成する。
In addition, although tantalum was used as the gate electrode metal 7, titanium (Ti), aluminum (At), or oxide/gesten (W) was used as the gate electrode material, and the unnecessary portions were anodic oxidized. TPT is similarly completed by plasma oxidation to form a titanium oxide layer (TlO2), an aluminum oxide layer (At203), and a tungsten oxide layer (TlO2), respectively.

(発明の効果) 以上のように本発明によれば、ゲート電極形成時に陽極
酸化またはプラズマ酸化を行ない不用のケ゛−V電極部
分を酸化し絶縁物化したことにょシ、ゲート電極の膜厚
による段差のない平坦なゲート電極が形成可能となった
。したがって、ゲート電極とノース電極、ゲート電極と
ドレイン電極間のリーク電流を微少におさえることが可
能となった。
(Effects of the Invention) As described above, according to the present invention, by performing anodic oxidation or plasma oxidation at the time of forming the gate electrode to oxidize the unnecessary C-V electrode portion and make it an insulator, the step difference due to the film thickness of the gate electrode can be reduced. It is now possible to form a flat gate electrode without any cracks. Therefore, it has become possible to suppress leakage current between the gate electrode and the north electrode, and between the gate electrode and the drain electrode to a minimum.

またこの作成法によれば高価な装置は必要なく、通常の
工程で製造できるため安価となる。
Furthermore, this manufacturing method does not require expensive equipment and can be manufactured using normal processes, resulting in low cost.

また、ステ、メカパレーノが問題にならないため、高い
信頼性が期待される。
In addition, high reliability is expected as there are no problems with the steering or mechanical systems.

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

図は本発明によって得られたTPTの一例を示す断面図
である。 1・・・絶縁物基板、2・・・絶縁層、3・・・デート
絶縁層、4・・・チャンネル層、5・・低抵抗非晶質シ
リコン層、6・・・ノース電極、7・・ドレイン電極。 特許出願人  沖電気工業株式会社 手続補正書(自発) l 事件の表示 昭和59年 特 許 頚第204113号2 発明の名
称 薄膜トランノスタの製造方法 3 補正をする者 事件との関係      特 許 出 願 人生 所(
〒105)  東京都港区虎ノ門1丁目7番12号5 
補正の対象 明細書中「発明の詳Mfiな説明」の欄、
6 補正の内容 14  明細書第4頁第15行目から第17行目に[ケ
ゝ−ト絶録層3、チャンネル層4、・・・・・ドレイン
電極7を」とちるのを下記の通り補正する。 「ゲート絶縁層4、チャンネル層5、低抵抗非晶質/リ
コン膜6、ソース電極7、ドレイン電極874J 2、同書第6頁第5行目から第7行目に「3・・・ゲー
ト絶、縁・  7・・・ドレイン電極。」とあるのを下
記の通り補正する。 「 3 ・ ケゝ−ト 電極層、 4 ・・・ケ8− 
ト 絶縁層、 、5・・チャンネル層、6・・・低抵抗
非晶質7977層、7・・ソース電極、8・・・ドレイ
ン電極。」3 図を別紙の通り補正する。
The figure is a sectional view showing an example of TPT obtained by the present invention. DESCRIPTION OF SYMBOLS 1... Insulator substrate, 2... Insulating layer, 3... Date insulating layer, 4... Channel layer, 5... Low resistance amorphous silicon layer, 6... North electrode, 7...・Drain electrode. Patent applicant Oki Electric Industry Co., Ltd. Procedural amendment (voluntary) l Indication of the case 1982 Patent No. 204113 2 Name of the invention Method for manufacturing thin film transnostar 3 Relationship with the case by the person making the amendment Patent application Life Place (
105) 1-7-12-5 Toranomon, Minato-ku, Tokyo
Subject of amendment: “Detailed description of the invention” column in the specification;
6 Contents of amendment 14 The text “[Kate isolation layer 3, channel layer 4, . . . drain electrode 7]” in lines 15 to 17 of page 4 of the specification has been changed as follows. to correct. "Gate insulating layer 4, channel layer 5, low resistance amorphous/licon film 6, source electrode 7, drain electrode 874J 2," in the same book, page 6, lines 5 to 7, "3...gate disconnection" , edge 7...drain electrode.'' should be corrected as follows. 3. Kate electrode layer, 4...ke8-
Insulating layer, 5...Channel layer, 6...Low resistance amorphous 7977 layer, 7...Source electrode, 8...Drain electrode. ”3 Correct the figure as shown in the attached sheet.

Claims (1)

【特許請求の範囲】[Claims]  基板表面にゲート電極となる金属の層を形成し、次い
でゲート電極となる部分以外を酸化することによってゲ
ート電極を選択的に形成したことを特徴とする薄膜トラ
ンジスタの製造方法。
1. A method for manufacturing a thin film transistor, comprising forming a metal layer to serve as a gate electrode on the surface of a substrate, and then selectively forming a gate electrode by oxidizing a portion other than the portion to become the gate electrode.
JP20411384A 1984-10-01 1984-10-01 Manufacture of thin film transistor Pending JPS6184065A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20411384A JPS6184065A (en) 1984-10-01 1984-10-01 Manufacture of thin film transistor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20411384A JPS6184065A (en) 1984-10-01 1984-10-01 Manufacture of thin film transistor

Publications (1)

Publication Number Publication Date
JPS6184065A true JPS6184065A (en) 1986-04-28

Family

ID=16485020

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20411384A Pending JPS6184065A (en) 1984-10-01 1984-10-01 Manufacture of thin film transistor

Country Status (1)

Country Link
JP (1) JPS6184065A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02113580A (en) * 1988-10-21 1990-04-25 Nec Corp Thin film circuit
JPH047876A (en) * 1990-04-25 1992-01-13 Nec Corp Thin film transistor
EP0506117A2 (en) * 1991-03-29 1992-09-30 Casio Computer Company Limited Thin-film transistor
JP2000353791A (en) * 1999-05-17 2000-12-19 Motorola Inc Magnetic random access memory and manufacture thereof
US6559341B2 (en) 1997-11-25 2003-05-06 Nihon Nohyaku Co., Ltd. Phthalic acid diamide derivatives, fluorine-containing aniline compounds as starting material, agricultural and horticultural insecticides, and a method for application of the insecticides

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51150986A (en) * 1975-06-19 1976-12-24 Mitsubishi Electric Corp Fabrication method of semiconductor device
JPS5721867A (en) * 1980-06-02 1982-02-04 Xerox Corp Planar thin film transistor array and method of producing same
JPS58124228A (en) * 1982-01-21 1983-07-23 Nec Corp Manufacture of semiconductor device
JPS58201364A (en) * 1982-05-20 1983-11-24 Matsushita Electric Ind Co Ltd Semiconductor device and manufacture thereof
JPS5994438A (en) * 1982-11-19 1984-05-31 Tdk Corp Forming method of patterned aluminum layer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51150986A (en) * 1975-06-19 1976-12-24 Mitsubishi Electric Corp Fabrication method of semiconductor device
JPS5721867A (en) * 1980-06-02 1982-02-04 Xerox Corp Planar thin film transistor array and method of producing same
JPS58124228A (en) * 1982-01-21 1983-07-23 Nec Corp Manufacture of semiconductor device
JPS58201364A (en) * 1982-05-20 1983-11-24 Matsushita Electric Ind Co Ltd Semiconductor device and manufacture thereof
JPS5994438A (en) * 1982-11-19 1984-05-31 Tdk Corp Forming method of patterned aluminum layer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02113580A (en) * 1988-10-21 1990-04-25 Nec Corp Thin film circuit
JPH047876A (en) * 1990-04-25 1992-01-13 Nec Corp Thin film transistor
EP0506117A2 (en) * 1991-03-29 1992-09-30 Casio Computer Company Limited Thin-film transistor
EP0506117A3 (en) * 1991-03-29 1995-09-27 Casio Computer Co Ltd Thin-film transistor
US6559341B2 (en) 1997-11-25 2003-05-06 Nihon Nohyaku Co., Ltd. Phthalic acid diamide derivatives, fluorine-containing aniline compounds as starting material, agricultural and horticultural insecticides, and a method for application of the insecticides
JP2000353791A (en) * 1999-05-17 2000-12-19 Motorola Inc Magnetic random access memory and manufacture thereof

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