JP3629361B2 - Sample stage - Google Patents

Sample stage Download PDF

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Publication number
JP3629361B2
JP3629361B2 JP03472798A JP3472798A JP3629361B2 JP 3629361 B2 JP3629361 B2 JP 3629361B2 JP 03472798 A JP03472798 A JP 03472798A JP 3472798 A JP3472798 A JP 3472798A JP 3629361 B2 JP3629361 B2 JP 3629361B2
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JP
Japan
Prior art keywords
sample
sample stage
holder
holding
drive shaft
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.)
Expired - Fee Related
Application number
JP03472798A
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Japanese (ja)
Other versions
JPH11233055A (en
Inventor
利昭 藤井
安彦 杉山
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.)
Hitachi High Tech Science Corp
Original Assignee
SII NanoTechnology 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
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Priority to JP03472798A priority Critical patent/JP3629361B2/en
Publication of JPH11233055A publication Critical patent/JPH11233055A/en
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Publication of JP3629361B2 publication Critical patent/JP3629361B2/en
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  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Jigs For Machine Tools (AREA)
  • Electron Beam Exposure (AREA)
  • Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)

Description

【0001】
【発明の属する技術分野】
板状の試料を搬送する装置に関するものである。特に、半導体ウエハやガラス基板などの試料を処理する半導体関連装置(電子ビーム描画装置、電子顕微鏡、集束イオンビーム加工装置等)において、試料を反応室にて保持する試料ステージに関する。
【0002】
【従来の技術】
図1を用いて、代表的な二軸試料ステージの例を説明する。
半導体関連装置において、反応室で半導体ウエハーやガラス基板などの試料1を保持するために用いられる二軸試料ステージは、試料1の移動する位置を二次元的に決定する第一駆動軸2a及び第二の駆動軸2bによって構成される。試料1は試料保持部3に載せられて保持される。そして、第一駆動軸2a及び第二の駆動軸2bにはそれぞれ第1の駆動モータ4a及び第2の駆動モータ4bが取り付けられて、それぞれを駆動することにより試料1はXY方向に移動される。
【0003】
このとき、試料保持部3は、試料1を落とすことなく、且つ、移動することなく保持する必要がある。そのため、例えば図2に示すように、試料保持部3に試料1が収まる形状の窪み3aを設け、試料保持部3が多少傾いても試料1が落ちないように、且つ位置がずれないようにしている。更に、図3に示すように、試料1を機械的に押さえる押さえ5を設けた機構や静電チャックを設け、試料1を保持部に固定する方法などが用いられている。
【0004】
【発明が解決しようとする課題】
しかしながら、上記第一の方法である試料を機械的に押さえ5を設けた機構の場合、試料1を表面から押さえつけることができないため、周辺から中央に向かう力を利用して押さえる必要がある。そのため、試料1が周辺から中央に向かって凸型にたわんでしまうといる課題があった。
【0005】
また、上記第二の方法である静電チャックの場合、試料1を静電気力で吸着させるため、その表面を平坦に仕上げることにより、上記第一の方法で課題となった試料1のたわみはない。しかし、静電チャックはセラミック製の高価なものであり、静電気力を発生するために数100Vの高圧電源が必要なことからその構成が複雑であること、更に高圧電源を用いることから感電事故などの安全性に問題があった。
【0006】
【課題を解決するための手段】
前記課題を解決するために、本発明では試料の保持に水素結合を用いる。
近年、ウエハー貼合わせに関する技術が研究されていて、ウエハー表面上の酸化珪素が寄与する水素結合によりウエハー同士が接合することが知られてきている。例えば、「SOIデバイスの展望」(応用物理Vol.66,No.11,1997)などに紹介されている。
【0007】
ここでは、この水素結合による試料の吸着を利用、安価で信頼性の高い試料ステージを実現する。
【0008】
【発明の実施の形態】
図1に示す代表的な二軸試料ステージの例を用いて、本発明の第一の実施例について説明する。
半導体関連装置において、反応室で半導体ウエハーやガラス基板などの試料を保持するために用いられる二軸試料ステージは、試料1の移動する位置を二次元的に決定する第一駆動軸2a及び第二の駆動軸2bによって構成される。試料1は試料保持部3に載せられて保持される。このとき、試料保持部3が試料1に接する部分は鏡面でかつ平坦に仕上げられ、その表面が酸化珪素によって被覆されている。第一駆動軸2a及び第二の駆動軸2bにはそれぞれ第1の駆動モータ4a及び第2の駆動モータ4bが取り付けられて、それぞれを駆動することにより試料1はXY方向に移動される。
【0009】
試料1は、半導体ウエハーやガラス基板などであるが、試料裏面が鏡面かもしくはそれに近い状態で処理されていて、その表面に水素結合に寄与する酸化珪素が存在する。そして、試料保持部3の試料1と接触する面には、珪素又は酸化珪素にて形成されている。珪素は、大気に長時間保持されることによりその表面には、酸化膜が形成されることになる。ことから、試料保持部3の表面試料1の表面とは、水素結合によって接合され、試料ステージの試料保持部3に保持される。このとき、試料保持部3は、試料1の試料保持部3に対する位置を常に一定にするため、例えば、図2に示すように、試料保持部3に試料1が収まる形状の窪み3aを設けられている。
【0010】
試料保持部3の窪み3aには、窪み3aの深さより薄い図示しない保持板を固定配置することも可能である。保持板は、水素結合に寄与する材料で、しかも鏡面を有している。保持板の材質は、珪素又はガラス等の珪素酸化物が望ましい。保持板を設けることにより、鏡面加工が容易になる。
試料1は、保持板と接触することになり、水素結合により試料1は、試料ホルダーに固定保持される。
【0011】
また、試料1を機械的に押さえる機構などを併用することにより、より信頼性の高い試料保持をすることもできる。
続いて、図4を用いて、本発明の第二の実施例について説明する。
半導体関連装置であるところの、電子顕微鏡や集束イオンビーム装置などでは、半導体ウエハーやガラス基板などの試料1を専用の試料保持部3を備え、専用の試料保持部3を試料ホルダーに脱着可能に設置される。この場合も、専用の試料保持部3の試料1と接触する部分を、鏡面でかつ平坦に仕上げ、さらに、その表面が酸化珪素で被覆されるようにする。これによって、試料1と専用の試料保持部3の試料保持部分が水素結合により接合される。
【0012】
なお、上記の実施例では、説明を簡単にするため、最も構成の簡単な二軸試料ステージを用いているが、更に、高さ、回転、傾斜などの駆動軸が加わってもその効果は変わらない。同様に、試料ステージの駆動軸が一軸であったり、更に、駆動軸の無い物であってもその効果は変わらない。
【0013】
【効果】
本発明によるならば、試料と試料保持部の間に発生する水素結合を用いることにより、格別の装置を用いることなく、試料ステージにおける試料保持の信頼性を向上できる。
【図面の簡単な説明】
【図1】図1は、試料ステージと試料の斜視図である。
【図2】図2は、試料ステージの試料保持部とと試料の斜視図である。
【図3】図3は、従来例の試料保持部と試料の斜視図である。
【図4】図4は、他の実施例の試料ステージと試料の斜視図である。
【符号の説明】
1・・・試料
2a・・第1軸駆動モータ
2b・・第2軸駆動モータ
3・・・試料保持部
3a・・窪み
4a・・第1軸駆動モータ
4b・・第2軸駆動モータ
5・・・押さえ
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for conveying a plate-like sample. In particular, the present invention relates to a sample stage that holds a sample in a reaction chamber in a semiconductor-related apparatus (such as an electron beam drawing apparatus, an electron microscope, or a focused ion beam processing apparatus) that processes a sample such as a semiconductor wafer or a glass substrate.
[0002]
[Prior art]
An example of a typical biaxial sample stage will be described with reference to FIG.
In a semiconductor-related apparatus, a biaxial sample stage used for holding a sample 1 such as a semiconductor wafer or a glass substrate in a reaction chamber has a first drive shaft 2a and a second drive shaft 2a that determine the position where the sample 1 moves two-dimensionally. It is constituted by two drive shafts 2b. The sample 1 is placed on and held by the sample holder 3. A first drive motor 4a and a second drive motor 4b are attached to the first drive shaft 2a and the second drive shaft 2b, respectively, and the sample 1 is moved in the XY directions by driving each of them. .
[0003]
At this time, the sample holder 3 needs to hold the sample 1 without dropping and without moving. Therefore, for example, as shown in FIG. 2, the sample holder 3 is provided with a recess 3a having a shape to accommodate the sample 1 so that the sample 1 does not fall and the position does not shift even if the sample holder 3 is slightly inclined. ing. Further, as shown in FIG. 3, a mechanism provided with a presser 5 that mechanically presses the sample 1 or a method of fixing the sample 1 to a holding part by providing a mechanism or an electrostatic chuck is used.
[0004]
[Problems to be solved by the invention]
However, in the case of a mechanism in which the sample is mechanically pressed 5 according to the first method, the sample 1 cannot be pressed from the surface. Therefore, it is necessary to press using the force from the periphery toward the center. For this reason, there is a problem that the sample 1 is bent in a convex shape from the periphery toward the center.
[0005]
Further, in the case of the electrostatic chuck that is the second method, the sample 1 is attracted by electrostatic force, so that the surface of the sample 1 is flattened so that there is no deflection of the sample 1 that has been a problem in the first method. . However, the electrostatic chuck is expensive made of ceramic and requires a high voltage power supply of several hundred volts in order to generate electrostatic force, so that its configuration is complicated, and furthermore, an electric shock accident is caused by using a high voltage power supply. There was a problem with safety.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the present invention, hydrogen bonding is used for holding the sample.
In recent years, techniques relating to wafer bonding have been studied, and it has been known that wafers are bonded to each other by hydrogen bonding contributed by silicon oxide on the wafer surface. For example, it is introduced in “Prospects of SOI devices” (Applied Physics Vol. 66, No. 11, 1997).
[0007]
Here, an inexpensive and highly reliable sample stage is realized by utilizing the adsorption of the sample by this hydrogen bond.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The first embodiment of the present invention will be described using an example of a typical biaxial sample stage shown in FIG.
In a semiconductor-related apparatus, a biaxial sample stage used for holding a sample such as a semiconductor wafer or a glass substrate in a reaction chamber includes a first drive shaft 2a and a second drive shaft 2a that determine the position where the sample 1 moves two-dimensionally. The drive shaft 2b. The sample 1 is placed on and held by the sample holder 3. At this time, the portion where the sample holder 3 is in contact with the sample 1 is finished to be mirror-like and flat, and the surface thereof is covered with silicon oxide. A first drive motor 4a and a second drive motor 4b are attached to the first drive shaft 2a and the second drive shaft 2b, respectively, and the sample 1 is moved in the XY directions by driving each.
[0009]
The sample 1 is a semiconductor wafer, a glass substrate, or the like, and is processed in a state where the back surface of the sample is a mirror surface or close to it, and silicon oxide contributing to hydrogen bonding exists on the surface. The surface of the sample holder 3 that contacts the sample 1 is formed of silicon or silicon oxide. When silicon is kept in the atmosphere for a long time, an oxide film is formed on the surface thereof. Therefore, the surface of the sample holder 3 is joined to the surface of the sample 1 by hydrogen bonding and is held by the sample holder 3 of the sample stage. At this time, in order to keep the position of the sample 1 relative to the sample holding unit 3 constant at this time, for example, as shown in FIG. ing.
[0010]
A holding plate (not shown) that is thinner than the depth of the recess 3 a can be fixedly arranged in the recess 3 a of the sample holder 3. The holding plate is a material that contributes to hydrogen bonding and has a mirror surface. The material of the holding plate is preferably silicon oxide such as silicon or glass. By providing the holding plate, mirror finishing becomes easy.
The sample 1 comes into contact with the holding plate, and the sample 1 is fixed and held on the sample holder by hydrogen bonding.
[0011]
Further, by using a mechanism for mechanically pressing the sample 1 or the like, it is possible to hold the sample with higher reliability.
Subsequently, a second embodiment of the present invention will be described with reference to FIG.
In an electron microscope or a focused ion beam apparatus, which is a semiconductor-related device, a sample 1 such as a semiconductor wafer or a glass substrate is provided with a dedicated sample holder 3, and the dedicated sample holder 3 can be attached to and detached from the sample holder. Installed. In this case as well, the portion of the dedicated sample holder 3 that comes into contact with the sample 1 is finished to be mirror-like and flat, and the surface is covered with silicon oxide. As a result, the sample 1 and the sample holding portion of the dedicated sample holding unit 3 are joined by hydrogen bonding.
[0012]
In the above embodiment, the simplest biaxial sample stage is used for the sake of simplicity of explanation, but the effect changes even if drive shafts such as height, rotation, and tilt are added. Absent. Similarly, the effect does not change even if the drive shaft of the sample stage is uniaxial or has no drive shaft.
[0013]
【effect】
According to the present invention, by using the hydrogen bond generated between the sample and the sample holding unit, it is possible to improve the reliability of the sample holding in the sample stage without using a special apparatus.
[Brief description of the drawings]
FIG. 1 is a perspective view of a sample stage and a sample.
FIG. 2 is a perspective view of a sample holding portion of a sample stage and a sample.
FIG. 3 is a perspective view of a sample holding portion and a sample of a conventional example.
FIG. 4 is a perspective view of a sample stage and a sample according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Sample 2a ... First axis drive motor 2b ... Second axis drive motor 3 ... Sample holder 3a ... Depression 4a ... First axis drive motor 4b ... Second axis drive motor 5 ... ..Presser

Claims (5)

試料保持部表面が親水性であり、かつ、鏡面でかつ平坦にしあげられていることを特徴とする試料ステージ。Sample holder surface Ri hydrophilic der, and a sample stage which is characterized that you have finished mirror-a and flat. 前記試料保持部表面が親水性物質よりなることを特徴とする請求項1記載の試料ステージ。2. The sample stage according to claim 1, wherein the surface of the sample holder is made of a hydrophilic substance. 前記親水性物質が酸化珪素であることを特徴とする請求項2記載の試料ステージ。The sample stage according to claim 2, wherein the hydrophilic substance is silicon oxide. 前記試料保持部が脱着可能に構成されていることを特徴とする請求項1からのいずれかに記載の試料ステージ。Sample stage according to any one of claims 1 to 3, wherein the sample holder is configured to removably. 前記試料保持部が試料が収まる窪みを有しており、前記窪みには、窪みの深さより薄く、水素結合に寄与する材料で、かつ、鏡面を有した保持板が設けられていることを特徴とする請求項1から4のいずれかに記載の試料ステージ。The sample holding part has a recess in which a sample is accommodated, and the recess is provided with a holding plate having a mirror surface that is thinner than the depth of the recess and that contributes to hydrogen bonding. The sample stage according to any one of claims 1 to 4.
JP03472798A 1998-02-17 1998-02-17 Sample stage Expired - Fee Related JP3629361B2 (en)

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JP03472798A JP3629361B2 (en) 1998-02-17 1998-02-17 Sample stage

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Application Number Priority Date Filing Date Title
JP03472798A JP3629361B2 (en) 1998-02-17 1998-02-17 Sample stage

Publications (2)

Publication Number Publication Date
JPH11233055A JPH11233055A (en) 1999-08-27
JP3629361B2 true JP3629361B2 (en) 2005-03-16

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7528929B2 (en) 2003-11-14 2009-05-05 Asml Netherlands B.V. Lithographic apparatus and device manufacturing method

Also Published As

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