JPH05152284A - Manufacture of oxide film on silicon surface - Google Patents

Manufacture of oxide film on silicon surface

Info

Publication number
JPH05152284A
JPH05152284A JP31670591A JP31670591A JPH05152284A JP H05152284 A JPH05152284 A JP H05152284A JP 31670591 A JP31670591 A JP 31670591A JP 31670591 A JP31670591 A JP 31670591A JP H05152284 A JPH05152284 A JP H05152284A
Authority
JP
Japan
Prior art keywords
oxide film
silicon
pattern
silicon surface
electron beam
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
JP31670591A
Other languages
Japanese (ja)
Inventor
Shoji Udagawa
田 川 昌 治 宇
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP31670591A priority Critical patent/JPH05152284A/en
Publication of JPH05152284A publication Critical patent/JPH05152284A/en
Pending legal-status Critical Current

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  • Formation Of Insulating Films (AREA)
  • Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)

Abstract

PURPOSE:To provide a method for manufacturing an extremely thin oxide film in an arbitrary region on a silicon (100) surface. CONSTITUTION:Electron beam 12 is partially irradiated to a (10) surface of silicon 11 to produce a defect pattern 13 of atomic size on the surface. The surface of the silicon 11 is exposed to oxide atmosphere 14 at a room temperature and an oxide film 15 is formed in the pattern 13 by using the fact that defect of atomic size is easy to be oxidized. According to this method, an extremely thin oxide film is manufactured in an arbitrary region of the silicon (100) surface.

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、シリコン表面に薄い酸
化膜のパターンを形成するための酸化膜製造方法に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxide film manufacturing method for forming a thin oxide film pattern on a silicon surface.

【0002】[0002]

【従来の技術】従来、半導体デバイスにおけるシリコン
表面に酸化膜(SiO2 )のパターンを形成する方法
は、図2に示すように、シリコン1の表面に酸化膜2を
一様に形成する酸化工程(a)と、酸化膜2の表面にフ
ォトレジスト3を一様に塗布した後、必要なパターンを
形成したフォトマスク4を使用して露光し、次いで現像
する露光現像工程(b),(c)と、表面に部分的に露
光した酸化膜2をエッチング液により除去するととも
に、表面に残るフォトレジスト3を除去して酸化膜2の
パターンを得るエッチング工程(d),(e)とを備え
ている。
2. Description of the Related Art Conventionally, a method of forming a pattern of an oxide film (SiO 2 ) on the surface of silicon in a semiconductor device is, as shown in FIG. 2, an oxidation step of uniformly forming an oxide film 2 on the surface of silicon 1. (A) and the exposure and development steps (b) and (c) in which the photoresist 3 is evenly applied to the surface of the oxide film 2 and then exposed using a photomask 4 on which a required pattern is formed and then developed. ) And etching steps (d) and (e) for removing the oxide film 2 partially exposed to the surface with an etching solution and removing the photoresist 3 remaining on the surface to obtain the pattern of the oxide film 2. ing.

【0003】シリコン1の表面に酸化膜2を一様に形成
する酸化工程(a)は、700°C〜1250°C程度
の温度に設定された炉内に酸化ガスを供給して行なわれ
る。酸化ガスとしては、O2 (乾燥酸素)、H2 O(水
蒸気)、またはH2 Oを含んだO2 やN2 等が用いられ
る。
The oxidation step (a) for uniformly forming the oxide film 2 on the surface of the silicon 1 is carried out by supplying an oxidizing gas into a furnace set to a temperature of about 700 ° C to 1250 ° C. As the oxidizing gas, O 2 (dry oxygen), H 2 O (steam), O 2 or N 2 containing H 2 O, or the like is used.

【0004】露光現像工程(b),(c)は、酸化膜2
の表面にフォトレジスト(感光性高分子材料)3を一様
に塗布し、その上にフォトマスク4の微細なパターンを
投影して感光させ、現像液に浸漬して光の当たった部分
のフォトレジスト3を除去してマスクパターンを得る
(逆の場合もある。)。この工程は、フォトマスク4を
使用せずに電子ビーム等により直接パターンを描画する
技術もある。
In the exposure and development steps (b) and (c), the oxide film 2 is used.
Photoresist (photosensitive polymer material) 3 is evenly coated on the surface of, and a fine pattern of photomask 4 is projected on it to expose it to light. The resist 3 is removed to obtain a mask pattern (the reverse is also true). In this step, there is also a technique of directly drawing a pattern with an electron beam or the like without using the photomask 4.

【0005】エッチング工程(d),(e)は、現像液
に酸化膜2上に残ったフォトレジスト3をマスクとし
て、露出している酸化膜2のみをエッチング液により腐
蝕させ、その後表面のフォトレジスト3を除去して酸化
膜2のパターンを得る。エッチング工程は、従来は化学
薬品を用いたウェットエッチングが主として行なわれて
いたが、最近では回路パターンの微細化、高精度化の要
求から気体中の物理的、化学的反応を利用するドライエ
ッチング法が行なわれるようになった。
In the etching steps (d) and (e), only the exposed oxide film 2 is corroded by the etching solution using the photoresist 3 remaining on the oxide film 2 as a mask in the developing solution, and then the surface photo The resist 3 is removed to obtain the pattern of the oxide film 2. Conventionally, wet etching using chemicals has been mainly used as the etching process, but recently, due to the demand for finer circuit patterns and higher precision, a dry etching method utilizing physical and chemical reactions in gas is used. Was started.

【0006】[0006]

【発明が解決しようとする課題】このように、従来のシ
リコン表面に酸化膜のパターンを形成する方法は、少な
くとも酸化、露光現像、エッチングの各工程を必要と
し、その間にも汚染除去のために超純水による洗浄が何
回も行なわれ、かつ使用する化学薬品やガス材料の中に
は危険なものもあり、その保守管理には十分に注意する
必要があった。
As described above, the conventional method of forming the pattern of the oxide film on the silicon surface requires at least the steps of oxidation, exposure and development, and etching. Cleaning with ultrapure water was performed many times, and some of the chemicals and gas materials used were dangerous, and it was necessary to pay sufficient attention to maintenance and management.

【0007】また、シリコン表面に形成される酸化膜の
成長がシリコン表面の凹凸や欠陥に左右されるため、非
常に薄い酸化膜パターンの形成が困難であるという問題
があった。
Further, since the growth of the oxide film formed on the silicon surface depends on the irregularities and defects on the silicon surface, there is a problem that it is difficult to form a very thin oxide film pattern.

【0008】本発明は、このような従来の問題を解決す
るものであり、製造が容易で非常に薄い酸化膜パターン
を容易に形成することのできる優れたシリコン表面の酸
化膜製造方法を提供することを目的とする。
The present invention solves such a conventional problem and provides an excellent method for manufacturing an oxide film on a silicon surface, which is easy to manufacture and can form an extremely thin oxide film pattern. The purpose is to

【0009】[0009]

【課題を解決するための手段】本発明は、上記目的を達
成するために、原子サイズの欠陥が酸化されやすいこと
を利用して、シリコン表面に電子ビームを部分的に照射
して電子ビームが当たった部分に原子サイズの欠陥を生
じさせた後、このシリコン表面を酸化雰囲気中に曝し
て、欠陥の生じた部分にのみ酸化膜を形成するようにし
たものである。
In order to achieve the above-mentioned object, the present invention utilizes the fact that atomic-size defects are easily oxidized, and partially irradiates the electron beam on the silicon surface to generate an electron beam. After producing atomic-size defects in the hit portion, the silicon surface is exposed to an oxidizing atmosphere so that an oxide film is formed only in the defective portion.

【0010】[0010]

【作用】したがって、本発明によれば、酸化膜の形成と
酸化膜パターンの形成とが同時に行なわれ、かつ酸化を
室温で行なうことができるので、シリコン基板を劣化さ
せずに高品質で安定した酸化膜パターンを極めて容易に
得ることができる。
Therefore, according to the present invention, since the formation of the oxide film and the formation of the oxide film pattern can be performed at the same time and the oxidation can be performed at room temperature, the silicon substrate is not deteriorated and stable with high quality. An oxide film pattern can be obtained very easily.

【0011】[0011]

【実施例】以下、本発明の一実施例について説明する。
図1は本発明の一実施例における酸化膜製造工程を模式
的に示したものである。まず工程(a)では、高度に洗
浄されたシリコン11の(100)表面に電子ビーム1
2を部分的に照射して必要なパターンを描画する。露光
装置は電子ビーム露光装置と同じ構造のものを使用す
る。電子ビーム12は、シリコン11を透過しない波長
のものが使用され、直径を描画パターンの線幅に応じて
絞り込み、シリコン11の表面の1原子層か2原子層の
ボンド結合を破壊するようにその出力が制御されてい
る。このようにして電子ビーム12によりパターンを描
画すると、電子ビーム12が当たった部分の表層のシリ
コン原子のボンド結合が切断されて原子の空隙が生じ、
欠陥パターン13が形成される。
EXAMPLE An example of the present invention will be described below.
FIG. 1 schematically shows an oxide film manufacturing process in one embodiment of the present invention. First, in step (a), an electron beam 1 is applied to the (100) surface of highly cleaned silicon 11.
2 is partially irradiated to draw the required pattern. The exposure apparatus has the same structure as the electron beam exposure apparatus. The electron beam 12 has a wavelength that does not pass through the silicon 11, and its diameter is narrowed according to the line width of the drawing pattern so that the bond bond of one atomic layer or two atomic layers on the surface of the silicon 11 is broken. Output is controlled. When the pattern is drawn by the electron beam 12 in this way, the bond bond of the silicon atom in the surface layer of the portion hit by the electron beam 12 is broken and the void of the atom is generated,
The defect pattern 13 is formed.

【0012】文献R.J.Hamers and U.K.Ko¨hler:“Dete
rmination of the local electronic structure of ato
mic-sized defects on Si(100) by Tunneling Spectros
copy”,J.Vac.Sci.Technol.A7(4),July/Aug 1989,pp285
4-2559には、Si(100)表面には、タイプCと呼ば
れる第1層の原子の欠陥が分布しており、このタイプC
の欠陥は強い金属的な性質を有することが記載されてい
る。したがって、シリコン11の表面の1原子層か2原
子層かを電子ビーム12で破壊して欠陥パターン13を
作ることにより、このパターン13の部分は他の部分よ
りも強い金属的な性質を呈することになり、酸化されや
すくなる。
Reference RJ Hamers and UK Ko ¨hler: “Dete
rmination of the local electronic structure of ato
mic-sized defects on Si (100) by Tunneling Spectros
copy ”, J.Vac.Sci.Technol.A7 (4), July / Aug 1989, pp285
In 4-2559, atomic defects of the first layer called type C are distributed on the Si (100) surface.
It is described that the defects of (1) have strong metallic properties. Therefore, by destroying one atomic layer or two atomic layers on the surface of the silicon 11 with the electron beam 12 to form the defect pattern 13, the portion of the pattern 13 has a stronger metallic property than the other portions. And is easily oxidized.

【0013】そこで、このような欠陥パターン13を形
成されたシリコン11の表面を、工程(b)において室
温で酸素分子(O2 )からなる酸化雰囲気14に曝すこ
とにより、欠陥パターン13の部分にのみ酸化膜15が
形成されることになる。この酸化膜15は極めて薄く、
かつ均一で安定したものである。
Therefore, the surface of the silicon 11 on which such a defect pattern 13 is formed is exposed to an oxidizing atmosphere 14 composed of oxygen molecules (O 2 ) at room temperature in the step (b), so that the portion of the defect pattern 13 is exposed. Only the oxide film 15 is formed. This oxide film 15 is extremely thin,
It is also uniform and stable.

【0014】半導体デバイスの高集積化、高性能化を達
成するために、パターンはより微細化されており、線幅
もサブミクロンが達成されている。このような状況にあ
って、酸化膜も、より薄いものが要求されている。従来
の酸化膜形成工程では、熱を長時間加える必要があるの
で、シリコン基板自体に不純物再拡散が生じ、品質を低
下させる恐れがある。これに対し、本実施例では、室温
で酸化膜が形成できるのでシリコン基板の品質を劣化さ
せることがない。また従来の酸化膜形成法では、酸化膜
を薄く形成すると不均一になるので、必要な絶縁破壊耐
圧を得るために酸化膜を厚く形成する必要があったが、
本実施例では、酸化膜を極く薄く形成しても均一な酸化
膜が得られるので、高品質で安定した酸化膜パターンを
得ることができる。
In order to achieve high integration and high performance of semiconductor devices, patterns have been made finer and line widths of submicron have been achieved. Under such circumstances, a thinner oxide film is required. In the conventional oxide film forming process, since it is necessary to apply heat for a long time, there is a possibility that impurity re-diffusion occurs in the silicon substrate itself and the quality is deteriorated. On the other hand, in this embodiment, since the oxide film can be formed at room temperature, the quality of the silicon substrate is not deteriorated. Further, in the conventional oxide film forming method, if the oxide film is formed thin, it becomes non-uniform, so it was necessary to form the oxide film thick in order to obtain the necessary breakdown voltage.
In this embodiment, since a uniform oxide film can be obtained even if the oxide film is formed extremely thin, a high quality and stable oxide film pattern can be obtained.

【0015】なお本実施例においては、酸化雰囲気を作
る酸化剤として酸素分子(O2 )を使用したが、これに
代えてH2 O,CO2,N2 O,NO,NO2 等を使用
することもできる。
In the present embodiment, oxygen molecules (O 2 ) were used as the oxidizing agent for forming the oxidizing atmosphere, but H 2 O, CO 2 , N 2 O, NO, NO 2 or the like was used instead. You can also do it.

【0016】[0016]

【発明の効果】本発明は、上記実施例から明らかなよう
に、原子サイズの欠陥が酸化されやすいことを利用し
て、シリコン表面に電子ビームを部分的に照射して電子
ビームが当たった部分に原子サイズの欠陥を生じさせた
後、このシリコン表面を酸化雰囲気中に曝して、欠陥の
生じた部分にのみ酸化膜を形成するようにしたものであ
り、酸化膜の形成と酸化膜パターンの形成とを同時に行
なうことができるので、酸化膜製造工程を大幅に短縮す
ることができるとともに、酸化を室温で行なうことがで
きるので、シリコン基板を劣化させずに高品質で安定し
た酸化膜パターンを得ることができる。
As is apparent from the above-described embodiments, the present invention utilizes the fact that atomic-size defects are easily oxidized, so that the silicon surface is partially irradiated with the electron beam, and the portion where the electron beam hits the surface. After producing atomic-size defects in the silicon, the silicon surface is exposed to an oxidizing atmosphere so that an oxide film is formed only in the areas where the defects are generated. Since the formation and the formation can be performed simultaneously, the oxide film manufacturing process can be significantly shortened, and the oxidation can be performed at room temperature, so that a high-quality and stable oxide film pattern can be formed without degrading the silicon substrate. Obtainable.

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

【図1】本発明の一実施例における酸化膜製造工程を示
す模式図
FIG. 1 is a schematic diagram showing an oxide film manufacturing process in one embodiment of the present invention.

【図2】従来例における酸化膜製造工程を示す模式図FIG. 2 is a schematic view showing an oxide film manufacturing process in a conventional example.

【符号の説明】[Explanation of symbols]

11 シリコン 12 電子ビーム 13 欠陥パターン 14 酸化雰囲気 15 酸化膜 11 silicon 12 electron beam 13 defect pattern 14 oxidizing atmosphere 15 oxide film

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 シリコン表面に電子ビームを部分的に照
射して電子ビームが当たった部分に原子サイズの欠陥を
生じさせ、このシリコン表面を酸化雰囲気中に曝すこと
により前記欠陥部分のみに酸化膜を形成するシリコン表
面の酸化膜製造方法。
1. A silicon surface is partially irradiated with an electron beam to generate an atomic size defect in a portion hit by the electron beam, and the silicon surface is exposed to an oxidizing atmosphere to form an oxide film only in the defective portion. A method for manufacturing an oxide film on a silicon surface for forming a film.
【請求項2】 シリコン表面が(100)面である請求
項1記載のシリコン表面の酸化膜製造方法。
2. The method for producing an oxide film on a silicon surface according to claim 1, wherein the silicon surface is a (100) plane.
JP31670591A 1991-11-29 1991-11-29 Manufacture of oxide film on silicon surface Pending JPH05152284A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31670591A JPH05152284A (en) 1991-11-29 1991-11-29 Manufacture of oxide film on silicon surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31670591A JPH05152284A (en) 1991-11-29 1991-11-29 Manufacture of oxide film on silicon surface

Publications (1)

Publication Number Publication Date
JPH05152284A true JPH05152284A (en) 1993-06-18

Family

ID=18079987

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31670591A Pending JPH05152284A (en) 1991-11-29 1991-11-29 Manufacture of oxide film on silicon surface

Country Status (1)

Country Link
JP (1) JPH05152284A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002280541A (en) * 2001-03-16 2002-09-27 Sharp Corp Method for forming fine pattern, unit electronic element and quantum dot laser

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002280541A (en) * 2001-03-16 2002-09-27 Sharp Corp Method for forming fine pattern, unit electronic element and quantum dot laser

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