JPH0232523A - Exposure control method - Google Patents

Exposure control method

Info

Publication number
JPH0232523A
JPH0232523A JP63184015A JP18401588A JPH0232523A JP H0232523 A JPH0232523 A JP H0232523A JP 63184015 A JP63184015 A JP 63184015A JP 18401588 A JP18401588 A JP 18401588A JP H0232523 A JPH0232523 A JP H0232523A
Authority
JP
Japan
Prior art keywords
exposure
shot
amount
shutter
lens
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
JP63184015A
Other languages
Japanese (ja)
Inventor
Koichiro Tsujita
好一郎 辻田
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP63184015A priority Critical patent/JPH0232523A/en
Publication of JPH0232523A publication Critical patent/JPH0232523A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03FPHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/70Microphotolithographic exposure; Apparatus therefor
    • G03F7/708Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
    • G03F7/70858Environment aspects, e.g. pressure of beam-path gas, temperature
    • G03F7/70883Environment aspects, e.g. pressure of beam-path gas, temperature of optical system

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Epidemiology (AREA)
  • Public Health (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)

Abstract

PURPOSE:To perform exposure control accurately by allowing a dummy shot after exposure power of a light source becomes stable to be a sampling shot. CONSTITUTION:A shutter 1 is opened by a drive part 2 and light is passed through a projection lens 7. An illumination meter 8 measures exposure power of a passing light and a lens control part 9 calculates the compensation amount being based on the relationship with the amount of illumination to the lens 7. An air pressure adjusting part 10 performs adjustment of air within the lens being based on the calculated value and adjusts the magnification and focusing. In this case, amount of illumination to the lens 7 is determined by performing dummy shot as a sampling shot before actual exposure. The illumination meter 8 measures the change in exposure power accompanying opening/closing of a shutter 1 and subtracts the offset of amount of exposure when the shutter closes from the integral value of an integrator 4 beforehand and stabilizes the amount of exposure.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、ウェーハに正確な露光を施す露光制御方法
に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exposure control method for accurately exposing a wafer.

〔従来の技術〕[Conventional technology]

従来、従えば縮小投影型露光装置(以下ステッパーとい
う)を用いての露光においては、実露光(実際にウェー
ハに露光を施すこと)前にダミーショットとして1シヨ
ツト露光し、その露光パワー(単位時間当りの光のエネ
ルギー)をもとに実露光時の露光量の安定化および投影
レンズの倍率とフォーカスの安定化のための露光制御を
行う。
Conventionally, in exposure using a reduction projection exposure system (hereinafter referred to as a stepper), one shot is exposed as a dummy shot before the actual exposure (actually exposing the wafer), and the exposure power (unit time) is Exposure control is performed to stabilize the exposure amount during actual exposure and to stabilize the magnification and focus of the projection lens based on the energy of the light that hits the lens.

ところで、上記露光方法には従来から通常モードとフラ
ッシュモードの二種類の方法がある。ここで通常モード
とは露光光源として用いるランプに流れる電流を一定に
し、露光光源からの光子常にを一定に保った状態でシャ
ッターの開閉により露光を行うものである。一方、フラ
ッシュモードとは、シャッターが開く露光時にのみラン
プに流れる電流を通常モード時の電流よりも増加させ、
露光時にのみ露光光源からの光量を増加させるものであ
る。上記どちらのモードにおいても−・回の露光量は常
に一定に保たなければならない。
By the way, there are conventionally two types of exposure methods: a normal mode and a flash mode. Here, the normal mode is one in which the current flowing through the lamp used as the exposure light source is kept constant, and exposure is performed by opening and closing the shutter while keeping the photons from the exposure light source constant. On the other hand, flash mode increases the current flowing through the lamp only during exposure when the shutter opens, compared to the current in normal mode.
The amount of light from the exposure light source is increased only during exposure. In either of the above modes, the amount of exposure of -.times. must always be kept constant.

第2図は、フラッシュモードでのショット回数とシャッ
ターオーブン時間との関係を示すグラフである。このグ
ラフは最初の数ショット(特に第1のショット)ではシ
ャッターオーブン時間が比較的長く、ショット露光回数
を多くするに従い、シャッターオーブン時間が短くなり
、一定回数以上になるとシャッターオーブン時間が安定
することを示している。このことより最初の数ショット
(特に第1シヨツトでは露光パワーが小さく、ショット
回数が一定回数以上になると露光パワーが安定すること
がわかる。
FIG. 2 is a graph showing the relationship between the number of shots in flash mode and shutter oven time. This graph shows that the shutter oven time is relatively long for the first few shots (especially the first shot), the shutter oven time becomes shorter as the number of shot exposures increases, and the shutter oven time becomes stable after a certain number of exposures. It shows. From this, it can be seen that the exposure power is small for the first few shots (particularly the first shot), and that the exposure power becomes stable when the number of shots exceeds a certain number.

〔発明が解決しようとりる課題〕[Problem that the invention attempts to solve]

従来の露光制御方法においては、実露光前にダミーショ
ットとして1シヨツト露光し、その露光パワーをもとに
、実露光時の露光量の安定化と、投影レンズの倍率及び
フォーカスの安定化のための露光制御を行っているが、
フラッシュモード使用時は、前述したように第1シヨツ
トの露光パワーが特に低い為、その露光パワーは実露光
時のものと等しくなく、露光制御が不正確になるという
問題点があった。
In the conventional exposure control method, one shot is exposed as a dummy shot before the actual exposure, and based on the exposure power, it is used to stabilize the exposure amount during the actual exposure and to stabilize the magnification and focus of the projection lens. Although the exposure control is performed,
When the flash mode is used, as mentioned above, the exposure power of the first shot is particularly low, so the exposure power is not equal to that during actual exposure, and there is a problem that exposure control becomes inaccurate.

この発明は、上記のような問題点を解消するためになさ
れたもので、露光制御が正確に行える露光制御方法を得
ることを目的とする。
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an exposure control method that can accurately control exposure.

〔課題を解決するための手段〕[Means to solve the problem]

この発明に係る露光方法は、ウェーハの実露光前にサン
プリングショットとしてのダミーショットを行ない、そ
の時の露光光源の露光パワーを基に前記ウェーハの実露
光時の露光制御を行う露光制御方法であって、前記露光
光源の前記露光パワーが前記ウェーハの実露光時と路間
−になった後の前記ダミーショットを前記サンプリング
ショットとするようにしている。
The exposure method according to the present invention is an exposure control method that performs a dummy shot as a sampling shot before the actual exposure of the wafer, and controls the exposure during the actual exposure of the wafer based on the exposure power of the exposure light source at that time. The sampling shot is the dummy shot after the exposure power of the exposure light source falls between that during actual exposure of the wafer.

〔作用〕[Effect]

この発明においては、露光光源の露光パワーが安定した
復のダミーショットをサンプリングショットしているの
で露光制御が正確に行える。
In this invention, since the exposure power of the exposure light source is stabilized and repeated dummy shots are used as sampling shots, exposure control can be performed accurately.

〔実施例〕〔Example〕

第1図はこの発明に係る露光制御方法に適用されるステ
ッパーの構成を示す図であり、従来がら用いられている
ものと同様である。図において、1は露光量を決定する
ためのシャッターであり、シャッター駆動部2に゛より
開閉される。ここで露光量とは、1シヨツト(シャッタ
ー1が1回開閉すること)露光時に照射される光のエネ
ルギー聞をいう(以下同じ)。3はシャッター駆動部2
に指令を送りシャッター1の開閉を制御するシャッター
開閉制御部、4は露光量あるいは露光パワーを測定する
ためのインテグレータである。シャッター開閉制御部3
は、インテグレータ4の露光量の測定値に応じシャッタ
ー駆動部2に指令を送ることにより、シャッター1のシ
ャッター速度を制御する。、5はレチクル、6はつI−
ハステージである。7はレチクル5とウェーハステージ
6の間に設けられ、ウェーハステージ6上に設置された
ウェーハ6aにレチクル5のパターンを投影するための
投影レンズである。投影レンズ7の内室には空気があり
、この空気の圧力を変化させることにより、倍率やフォ
ーカスを変化させる。8はウェーハステージ6上に設け
られ、投影レンズ7を介しウェーハステージ6上に与え
られる露光パワーを測定する照度計、9は照度計8によ
り測定された露光パワーに応じ指令を発するレンズ制御
部、10はレンズ制御部9からの指令に基づき投影レン
ズ7の内室の空気圧を変化させるレンズ空気圧制御部で
ある。
FIG. 1 is a diagram showing the configuration of a stepper applied to the exposure control method according to the present invention, and is similar to that used conventionally. In the figure, 1 is a shutter for determining the exposure amount, and is opened and closed by a shutter drive section 2. Here, the exposure amount refers to the energy of light irradiated during one shot exposure (one opening and closing of the shutter 1) (the same applies hereinafter). 3 is the shutter drive unit 2
4 is an integrator for measuring the exposure amount or exposure power. Shutter opening/closing control section 3
controls the shutter speed of the shutter 1 by sending a command to the shutter drive unit 2 according to the measured value of the exposure amount of the integrator 4. , 5 is reticle, 6 is I-
It's a stage. A projection lens 7 is provided between the reticle 5 and the wafer stage 6, and is used to project the pattern of the reticle 5 onto the wafer 6a placed on the wafer stage 6. There is air in the interior of the projection lens 7, and by changing the pressure of this air, the magnification and focus are changed. 8 is an illuminance meter provided on the wafer stage 6 and measures the exposure power applied to the wafer stage 6 through the projection lens 7; 9 is a lens control unit that issues commands in accordance with the exposure power measured by the illuminance meter 8; Reference numeral 10 denotes a lens air pressure control section that changes the air pressure in the interior of the projection lens 7 based on commands from the lens control section 9.

次に動作について説明する。まず、シャッター駆動部2
によりシャッター1を開は露光を開始する。光は、レチ
クル5に与えられ、レチクル5のパターンは投影レンズ
7を介し、ウェーハステージ6上のウェーハ6aに投影
される。そして、インテグレータ4の測定露光mが所定
値に達するとシャッター開閉制御部3はシャッター駆動
部2へ指令を伝え、シャッター駆動部2は、シャッター
1を閉じる。以上が1シヨツト露光の動作である。
Next, the operation will be explained. First, shutter drive section 2
When the shutter 1 is opened, exposure is started. Light is applied to the reticle 5, and the pattern of the reticle 5 is projected onto the wafer 6a on the wafer stage 6 via the projection lens 7. Then, when the measured exposure m of the integrator 4 reaches a predetermined value, the shutter opening/closing control section 3 transmits a command to the shutter driving section 2, and the shutter driving section 2 closes the shutter 1. The above is the operation of one shot exposure.

上記動作において、投影レンズ7に光が照射されると、
投影レンズ7への光の照射量(光エネルギーの累積量〉
に応じ投影レンズ7の倍率やフォーカスが変動すること
が知られている。そこで、前記変動量を補正するため、
1シヨツト露光ごとに照度計8で投影レンズ7を通過し
た光の露光パワーを測定し、この露光パワーと投影レン
ズ7への光の照射は(以下に述べるようにダミーショッ
トにより求める)との関係に基づき、レンズ制御部9が
その補正量を計算し、この計算値に基づきレンズ空気圧
調整部1oが投影レンズ7の内室の空気圧を調整し、投
影レンズ7の倍率、フォーカスを調整するようにしてい
る。ここで、投影レンズ7への光の照射量は、実露光前
のサンプリングショットとしてダミーショットを行ない
、このときの露光パワーを照度計8で測定し、この測定
値にショット回数を掛算して求める。
In the above operation, when the projection lens 7 is irradiated with light,
Amount of light irradiated onto the projection lens 7 (cumulative amount of light energy)
It is known that the magnification and focus of the projection lens 7 vary depending on the situation. Therefore, in order to correct the amount of variation,
For each shot exposure, the exposure power of the light passing through the projection lens 7 is measured using the illuminance meter 8, and the relationship between this exposure power and the irradiation of the light onto the projection lens 7 is (determined using a dummy shot as described below). Based on this, the lens control unit 9 calculates the correction amount, and the lens air pressure adjustment unit 1o adjusts the air pressure in the interior of the projection lens 7 based on this calculated value, and adjusts the magnification and focus of the projection lens 7. ing. Here, the amount of light irradiated onto the projection lens 7 is determined by performing a dummy shot as a sampling shot before actual exposure, measuring the exposure power at this time with an illumination meter 8, and multiplying this measured value by the number of shots. .

また、指定された露光量で露光するため、インデグレー
タ4を設け、インテグレータ4の測定値が所定値に達す
るとシャッター1を閉じ露光を止めるようにしているが
、インテグレータ4の測定値が実際に所定値に達した後
シャッター1をmじる動作を始めたのではシャッター1
が閉じている途中において余分に露光されることになる
。これを防止すべく、実露光前にサンプリングショット
としてダミーショットを行ない、インテグレータ4でシ
ャッター1の開閉に伴う露光パワーの変化を測定しシャ
ッター1が閉じる時の露光量を求め、これをオフセット
として、インテグレータ4の前記所定値よりあらかじめ
減算しておくことにより露光量の安定化をはかつている
In addition, in order to perform exposure with a specified exposure amount, an integrator 4 is provided, and when the measured value of the integrator 4 reaches a predetermined value, the shutter 1 is closed and the exposure is stopped. After reaching the value, the shutter 1 starts to be adjusted.
This results in extra exposure while the lens is closing. In order to prevent this, a dummy shot is performed as a sampling shot before the actual exposure, and the integrator 4 measures the change in exposure power as the shutter 1 opens and closes to find the exposure amount when the shutter 1 closes, and uses this as an offset. The exposure amount is stabilized by subtracting it from the predetermined value of the integrator 4 in advance.

この発明においてのフラッシュモードでは、従来、実露
光前、サンプリングショットとしてのダミーショットを
1シヨツト露光しか行っていなかったのを、複数ショッ
トを行い、その露光パワーが安定した時点の、ショット
(一般には最終ショット)をサンプリングショットとす
るようにしている。このようにすることにより、フラッ
シュモードにおいて、サンプリングショットの露光パワ
ーがサンプリングショット後に行われる実露光時の露光
パワーと路間−になる。そして、このサンプリングショ
ットの露光パワーを基準に、インテグレータ4のオフセ
ットの計算及び投影レンズ7への光の照射量の計鐸をす
ることにより、実露光時の露光量の安定化、投影レンズ
7の倍率及びフォーカスの安定化のための露光制御がよ
り正確に行われる。
In the flash mode of this invention, whereas conventionally only one dummy shot as a sampling shot was exposed before the actual exposure, multiple shots are performed and the shot (generally The final shot) is used as the sampling shot. By doing this, in the flash mode, the exposure power of the sampling shot is between the exposure power of the actual exposure performed after the sampling shot and the exposure power of the actual exposure performed after the sampling shot. Then, by calculating the offset of the integrator 4 and measuring the amount of light irradiated to the projection lens 7 based on the exposure power of this sampling shot, the amount of exposure during actual exposure is stabilized, and the amount of light irradiated to the projection lens 7 is stabilized. Exposure control for stabilizing magnification and focus can be performed more accurately.

なお、上記実施例ではダミーショットを複数回行う場合
について説明したが、露光光源の露光パワーが安定した
模に、サンプリングショットとしてのダミーショットを
1ショット行うようにしても上記実施例と同様の効果が
得られる。
In the above embodiment, the case where the dummy shot is performed multiple times has been explained, but even if one dummy shot is performed as a sampling shot to simulate the stabilization of the exposure power of the exposure light source, the same effect as in the above embodiment can be obtained. is obtained.

〔発明の効果〕〔Effect of the invention〕

以上のようにこの発明によれば、露光光源の露光パワー
がウェーハの実露光時と路間−になった後のダミーショ
ットをサンプリングショットにしたので、サンプリング
ショットの露光パワーを基にウェーハの実露光時の露光
制御を行う場合、より正確に露光制御が行えるという効
果がある。
As described above, according to the present invention, since the dummy shot after the exposure power of the exposure light source falls between the actual exposure of the wafer and the sampling shot is used as the sampling shot, it is possible to perform the actual exposure of the wafer based on the exposure power of the sampling shot. When performing exposure control during exposure, there is an effect that exposure control can be performed more accurately.

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

第1図はこの発明に係る露光制御方法に適用されるステ
ッパーの構成を示す図、第2図はフラッシュモード時の
ショット回数とシャッターオーブン時間との関係を示す
グラフである。 図において、1はシャッター 2はシャッター駆動部、
3はシャッター開閉制御部、4はインテグレータ、5は
レチクル、6はウェーハステージ、6aはウェーハ、7
は投影レンズ、8は照度計、9はレンズ制御部、10は
レンズ空気圧制御部である。 なお、各図中同一符号は同一または相当部分を示す。
FIG. 1 is a diagram showing the configuration of a stepper applied to the exposure control method according to the present invention, and FIG. 2 is a graph showing the relationship between the number of shots and shutter oven time in flash mode. In the figure, 1 is a shutter, 2 is a shutter drive unit,
3 is a shutter opening/closing control unit, 4 is an integrator, 5 is a reticle, 6 is a wafer stage, 6a is a wafer, 7
8 is a projection lens, 8 is an illumination meter, 9 is a lens control section, and 10 is a lens air pressure control section. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] (1)ウェーハの実露光前にサンプリングショットとし
てのダミーショットを行ない、その時の露光光源の露光
パワーを基に前記ウェーハの実露光時の露光制御を行う
露光制御方法であつて、前記露光光源の前記露光パワー
が前記ウェーハの実露光時と略同一になった後の前記ダ
ミーショットを前記サンプリングショットとすることを
特徴とする露光制御方法。
(1) An exposure control method that performs a dummy shot as a sampling shot before the actual exposure of the wafer, and controls the exposure during the actual exposure of the wafer based on the exposure power of the exposure light source at that time, the method comprising: An exposure control method characterized in that the dummy shot after the exposure power becomes substantially the same as that during actual exposure of the wafer is used as the sampling shot.
JP63184015A 1988-07-22 1988-07-22 Exposure control method Pending JPH0232523A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63184015A JPH0232523A (en) 1988-07-22 1988-07-22 Exposure control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63184015A JPH0232523A (en) 1988-07-22 1988-07-22 Exposure control method

Publications (1)

Publication Number Publication Date
JPH0232523A true JPH0232523A (en) 1990-02-02

Family

ID=16145844

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63184015A Pending JPH0232523A (en) 1988-07-22 1988-07-22 Exposure control method

Country Status (1)

Country Link
JP (1) JPH0232523A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020136697A1 (en) * 2018-12-25 2020-07-02 株式会社日立ハイテク Defect inspection device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62125359A (en) * 1985-11-27 1987-06-06 Canon Inc Exposing device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62125359A (en) * 1985-11-27 1987-06-06 Canon Inc Exposing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020136697A1 (en) * 2018-12-25 2020-07-02 株式会社日立ハイテク Defect inspection device

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