JP5292669B2 - Extreme ultraviolet exposure mask, manufacturing method thereof, and extreme ultraviolet exposure method - Google Patents

Extreme ultraviolet exposure mask, manufacturing method thereof, and extreme ultraviolet exposure method Download PDF

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JP5292669B2
JP5292669B2 JP2006024220A JP2006024220A JP5292669B2 JP 5292669 B2 JP5292669 B2 JP 5292669B2 JP 2006024220 A JP2006024220 A JP 2006024220A JP 2006024220 A JP2006024220 A JP 2006024220A JP 5292669 B2 JP5292669 B2 JP 5292669B2
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extreme ultraviolet
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film
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resist
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JP2007207964A (en
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正 松尾
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Toppan Inc
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Description

本発明は半導体製品の製造プロセスの中でも、極端紫外線露光を用いたフォトリソグラフィー工程時に使用される極端紫外光露光用マスク及びそのマスクの製造方法並びに露光方法に関するものである。   The present invention relates to a mask for extreme ultraviolet light exposure used in a photolithography process using extreme ultraviolet exposure, a method for manufacturing the mask, and an exposure method, among the manufacturing processes of semiconductor products.

半導体集積回路の微細化は年々進んでおり、それに伴いフォトリソグラフィー技術に使用される光もその短波長化が進んでいる。近況としては、これまで光源として使用されてきたKrFエキシマレーザー(波長248nm)からArFエキシマレーザー(波長193nm)に移行しつつある。また、ArFエキシマレーザーを使用する液浸露光法の研究が近年活発に行われており、50nm以下の線幅を目標とする動きもある。   The miniaturization of semiconductor integrated circuits has been progressing year by year, and accordingly, the light used for photolithography technology has also been shortened. In recent times, the KrF excimer laser (wavelength 248 nm), which has been used as a light source, has been shifted to an ArF excimer laser (wavelength 193 nm). In recent years, an immersion exposure method using an ArF excimer laser has been actively researched, and there is a movement aiming at a line width of 50 nm or less.

しかしながら、ArFエキシマレーザーを使用する液浸露光法もその研究が進んでいるとはいえ、その実現可能性は不鮮明である。このような背景から、エキシマレーザーよりも波長が一桁以上短い(10〜15nm)極端紫外線(Extreme Ultra Violet、以下EUVと略記)を用いた、EUVリソグラフィーの研究開発が進められている。   However, although the immersion exposure method using an ArF excimer laser has been researched, its feasibility is unclear. Under such circumstances, research and development of EUV lithography using extreme ultraviolet (Extreme Ultra Violet, hereinafter abbreviated as EUV) whose wavelength is one or more orders of magnitude shorter than excimer lasers (10 to 15 nm) is being promoted.

EUV光はその波長の短さから、物質中での屈折率が真空の値に近く、材料間の光吸収の差も小さい。このようなEUV光の性質より、これまでのフォトリソグラフィーにおいて多用されてきた透過型の屈折光学系を組むことが困難となり、マスクは反射型となっている。現在のところEUV光用のマスクとして開発されているものは、まずEUV光に対する反射膜としては例えばSiウェハーやガラス基板上にSiとMoの二層膜を40組ほど成膜した多層膜があって、そしてその上層にキャッピング膜や緩衝膜、EUV光吸収膜、その上に検査光用の低反射膜などを含む吸収領域があるものが一般的である。   Due to the short wavelength of EUV light, the refractive index in the substance is close to the value of vacuum, and the difference in light absorption between materials is small. Such a property of EUV light makes it difficult to assemble a transmissive refractive optical system that has been widely used in photolithography so far, and the mask is of a reflective type. At present, a mask that has been developed as a mask for EUV light includes, for example, a multilayer film in which about 40 pairs of two layers of Si and Mo are formed on a Si wafer or a glass substrate as a reflection film for EUV light. In general, an upper layer includes an absorption region including a capping film, a buffer film, an EUV light absorption film, and a low reflection film for inspection light.

図2は、従来のEUVマスクの例を断面で示した説明図である。基板11としては、Siウェハーやガラス基板が使われる。その基板11上にはEUV光高反射率多層膜12が形成されている。その上にはTaなどEUV光吸収性の大きい金属を主成分とした光吸収膜15があり、多層膜12と光吸収膜15の間に、キャッピング膜13、緩衝膜14がこの順で形成されている。緩衝膜には、Crなどの金属やSiO2などが使用されることが多い。緩衝膜は吸収膜のドライエッチ時や欠陥修正時に多層膜へのダメージを緩和する膜であり、キャッピング膜は文字通り多層膜を保護する役目を持った膜であり、SiやRuが使用されることが多い。 FIG. 2 is an explanatory view showing an example of a conventional EUV mask in cross section. As the substrate 11, a Si wafer or a glass substrate is used. An EUV light high reflectance multilayer film 12 is formed on the substrate 11. On top of that, there is a light absorption film 15 mainly composed of a metal having a large EUV light absorption property such as Ta, and a capping film 13 and a buffer film 14 are formed in this order between the multilayer film 12 and the light absorption film 15. ing. For the buffer film, a metal such as Cr or SiO 2 is often used. The buffer film is a film that alleviates damage to the multilayer film at the time of dry etching or defect correction of the absorption film, and the capping film literally has a role of protecting the multilayer film, and Si or Ru is used. There are many.

しかしこのような反射型EUVマスクは多層膜部分の膜欠陥を減らすことが極めて難しく、また、吸収膜と多層膜の間には、上記のように緩衝膜やキャッピング膜を必要とし、複雑な層構成を持っていた。   However, such a reflective EUV mask is extremely difficult to reduce the film defects in the multilayer film portion, and requires a buffer film and a capping film between the absorption film and the multilayer film as described above. Had a configuration.

以下に、公知の技術文献を示す。
特開2004−342734号公報
The known technical literature is shown below.
JP 2004-342734 A

本発明では、反射型EUVマスクの製造困難性を解消するために、ステンシル構造を有するEUV露光のための極端紫外線露光用マスク並びにそれを用いた極端紫外線の露光方
法を提供することを課題とする。
An object of the present invention is to provide an extreme ultraviolet exposure mask for EUV exposure having a stencil structure and an extreme ultraviolet exposure method using the same in order to eliminate the difficulty in manufacturing a reflective EUV mask. .

本発明は係る課題に鑑みなされたもので、請求項1の発明は、
極端紫外線を吸収する薄膜の部分と、前記紫外線を透過するために前記薄膜に開口した透過孔の部分からなる極端紫外線露光用マスクであって、
1)前記極端紫外線を吸収する薄膜の部分を透過する透過光の、入射光に対する透過率をT、前記透過孔を透過する透過光の、入射光に対する透過率をT0とするとき、Tが3〜13%であり、さらにTとT0の位相差がπの奇数倍であり、
)前記極端紫外線を吸収する薄膜の部分が下記材料群の1つを主成分とすることを特徴とする極端紫外線露光用マスク。
(Si、BをドープしたSi、SiC、SiN、DLC膜、ダイヤモンド膜)
である。
The present invention has been made in view of the problems, and the invention of claim 1
A mask for extreme ultraviolet exposure comprising a portion of a thin film that absorbs extreme ultraviolet light and a portion of a transmission hole that is opened in the thin film to transmit the ultraviolet light,
1) When T is the transmittance for incident light of the transmitted light that is transmitted through the portion of the thin film that absorbs extreme ultraviolet light, and T 0 is the transmittance for incident light of the transmitted light that is transmitted through the transmission hole, T is 3 to 13%, and the phase difference between T and T 0 is an odd multiple of π,
2 ) A mask for extreme ultraviolet exposure, wherein the portion of the thin film that absorbs extreme ultraviolet rays contains one of the following material groups as a main component.
(Si, SiC doped with Si, B, SiN, DLC film, diamond film)
It is.

本発明の請求項の発明は活性層/絶縁層(SiO)/基板(Si)層を構成したSOI基板の活性層を、請求項に記載の極端紫外線を吸収する薄膜と同じ材料としたSOI基板を用意し、基板層側に保護膜を成膜し、フォトリソグラフィにより裏面開口部形成のためのレジストパターンを形成し、レジストパターンをマスクにして保護膜をドライエッチングし開口部とする部分の保護膜を除去し、レジストを剥離後保護膜をマスクとして、基板層側のSiをエッチングし開口部を形成し、活性層側に電子線レジストを塗布し電子線描画により透過孔を形成するためのレジストパターンを形成し、レジストパターンをマスクにして活性層をドライエッチングし透過孔を形成し、電子線レジストを剥離することを特徴とする極端紫外線露光マスクの製造方法としたものである。
According to a second aspect of the present invention, the active layer of the SOI substrate comprising the active layer / insulating layer (SiO 2 ) / substrate (Si) layer is made of the same material as the thin film that absorbs extreme ultraviolet rays according to the first aspect. An SOI substrate is prepared, a protective film is formed on the substrate layer side, a resist pattern for forming a back surface opening is formed by photolithography, and the protective film is dry-etched using the resist pattern as a mask to form an opening. After removing the part of the protective film, peeling off the resist, using the protective film as a mask, etching the Si on the substrate layer side to form an opening, applying an electron beam resist to the active layer side, and forming a transmission hole by electron beam drawing A resist pattern is formed, and the active layer is dry-etched using the resist pattern as a mask to form a transmission hole, and the electron beam resist is peeled off. It is obtained by the production method of the mask.

本発明の請求項の発明は、単結晶Si基板の表側に、請求項に記載のSiC、SiN、DLC膜、ダイヤモンド膜いずれかの材料を主成分とした極端紫外線を吸収する薄膜を形成し、裏側に保護膜成膜し、フォトリソグラフィにより裏側開口部形成のためのレジストパターンを形成し、レジストパターンをマスクにして保護膜をドライエッチングし開口部とする部分の保護膜を除去し、レジストを剥離後保護膜をマスクとして基板側のSiをエッチングし開口部を形成し、表側に電子線レジストを塗布し電子線描画により透過孔を形成するためのレジストパターンを形成し、レジストパターンをマスクにしてSiC、SiN、DLC膜、ダイヤモンド膜のいずれかの薄膜をドライエッチングし透過孔を形成し、電子線レジストを剥離することを特徴とする極端紫外線露光マスクの製造方法としたものである。
According to the invention of claim 3 of the present invention, a thin film that absorbs extreme ultraviolet rays mainly composed of any one of the SiC, SiN, DLC film and diamond film of claim 1 is formed on the front side of the single crystal Si substrate. Then, a protective film is formed on the back side, a resist pattern for forming the back side opening is formed by photolithography, the protective film is dry-etched using the resist pattern as a mask, and the part of the protective film that becomes the opening is removed, After removing the resist, the substrate side Si is etched using the protective film as a mask to form an opening, an electron beam resist is applied to the front side, and a resist pattern for forming a transmission hole is formed by electron beam drawing. Using a mask, dry etching is performed on any one of SiC, SiN, DLC film, and diamond film to form transmission holes, and the electron beam resist is peeled off. It is obtained by the method for producing extreme ultraviolet exposure mask characterized by and.

本発明の請求項の発明は、請求項に記載の極端紫外線露光用マスク、または請求項またはに記載の極端紫外線露光マスクの製造方法で製造された極端紫外線露光マスクに極端紫外線を照射し、転写パターンの形状に極端紫外線を成形する工程を具備することを特徴とする極端紫外線の露光方法。 The invention of claim 4 of the present invention, the extreme ultraviolet to extreme ultraviolet exposure mask manufactured by the manufacturing method of the extreme ultraviolet exposure mask according to extreme ultraviolet exposure mask or claim 2 or 3, according to claim 1 An extreme ultraviolet exposure method comprising the step of irradiating and forming extreme ultraviolet rays in the shape of a transfer pattern.

本発明の極端紫外光露光用マスクでは、以上のような構成であるから、極端紫外線の透過光を露光してパターン転写できるので、反射型EUVマスクの製造困難性を解消した極端紫外光露光用マスク及びその製造方法並びにそのマスクを用いた極端紫外線の露光方法とすることができる。   Since the extreme ultraviolet light exposure mask of the present invention is configured as described above, the pattern can be transferred by exposing the transmitted light of extreme ultraviolet light, so that the manufacturing difficulty of the reflective EUV mask is eliminated. A mask, a manufacturing method thereof, and an extreme ultraviolet exposure method using the mask can be obtained.

更に、本発明の露光方法によると、試料基板上に形成されたレジストに対し、精度良いパターン露光が長期間可能となり、その結果、半導体等のパターンの製造を、高い歩留まりで行うことが出来る。   Furthermore, according to the exposure method of the present invention, it is possible to perform pattern exposure with high accuracy for a resist formed on a sample substrate for a long period of time, and as a result, it is possible to manufacture a pattern of a semiconductor or the like with a high yield.

以下、本発明の実施の形態例を、図面を参照しながら説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図1は本発明の極端紫外線露光用マスクの一例を断面で示す部分説明図である。   FIG. 1 is a partial explanatory view showing an example of an extreme ultraviolet exposure mask of the present invention in cross section.

<例1>
図1で、本例の極端紫外線露光用マスクは、極端紫外線を吸収する薄膜1の部分と、前記紫外線を透過するために前記薄膜1に開口した透過孔2の部分からなる。本例ではこの薄膜が基板3上に設けられている。なお、透過孔2は薄膜1と比較し極端紫外線に対して相対的に透過であればよく、例えば透過孔2に膜を設け、透過光の位相をずらすなどしても良い。
<Example 1>
In FIG. 1, the extreme ultraviolet exposure mask of this example comprises a portion of a thin film 1 that absorbs extreme ultraviolet rays and a portion of a transmission hole 2 that is opened in the thin film 1 to transmit the ultraviolet rays. In this example, this thin film is provided on the substrate 3. The transmission hole 2 only needs to be relatively transparent to extreme ultraviolet light as compared with the thin film 1. For example, a film may be provided in the transmission hole 2 to shift the phase of transmitted light.

<例2>
また本発明の極端紫外線露光用マスクは、前記極端紫外線を吸収する薄膜1の部分を透過する透過光の、入射光に対する透過率をT、前記透過孔2を透過する透過光の、入射光に対する透過率をT0とするとき、下式で表されるDが3以上である。
<Example 2>
In the extreme ultraviolet exposure mask of the present invention, the transmittance of the transmitted light transmitted through the portion of the thin film 1 that absorbs the extreme ultraviolet light is T with respect to the incident light, and the transmitted light transmitted through the transmission hole 2 with respect to the incident light. When the transmittance is T0, D represented by the following formula is 3 or more.

D=−log10(T/T0)・・・・(1)。     D = −log10 (T / T0) (1).

従来のKrFやArF用のマスクでは、Dの値は2.5以上でも利用可能であるが、波長が短く、パターンの線幅も小さいEUVマスクでは、良好な転写を行うには、Dの値は3以上が望ましい。   Conventional masks for KrF and ArF can be used even if the value of D is 2.5 or more, but in the case of an EUV mask with a short wavelength and a small pattern line width, the value of D can be used for good transfer. Is preferably 3 or more.

<例3>
例2の極端紫外線露光用マスクについて、透過率T0がほぼ100%となるバイナリマスクを例として説明する。もっとも代表的な波長13.5nmのEUV光を本例のマスクに露光し、それを吸収する部分の薄膜材料としてSiを選び、Siの膜厚に対して透過率Tと、Dを計算した結果を図3に示す。図で横軸は、膜厚の値を、縦軸はT、Dの値を示す。図3よりSi膜厚がほぼ4μm以上であれば、D>3となり、安定したバイナリマスクとなることが分る。Si膜厚は厚くなるほど強度は増すが、反面透過孔を形成するためのエッチングが難しくなるので、厚すぎるのも良くない。
<Example 3>
The extreme ultraviolet exposure mask of Example 2 will be described using a binary mask having a transmittance T0 of almost 100% as an example. The most representative EUV light having a wavelength of 13.5 nm is exposed on the mask of this example, Si is selected as a thin film material for absorbing the mask, and the transmittance T and D are calculated with respect to the film thickness of Si. Is shown in FIG. In the figure, the horizontal axis represents the film thickness value, and the vertical axis represents the T and D values. From FIG. 3, it can be seen that when the Si film thickness is approximately 4 μm or more, D> 3 and a stable binary mask is obtained. As the Si film thickness increases, the strength increases, but on the other hand, etching for forming the transmission hole becomes difficult, so it is not good that it is too thick.

<例3の作成方法>
また、本例の極端紫外線露光用マスクは次ぎのようにして作成できる。
<Creation method of Example 3>
The extreme ultraviolet exposure mask of this example can be prepared as follows.

まず、上部の活性層が上記の条件を満たす薄膜とし、活性層の厚みが5μmであるSOI(活性層/絶縁層(SiO2)/基板(Si)の層構成をしたもの)を用意する。つぎに、裏面に保護膜(CVDやスパッタにより成膜したSiNなど)を成膜する。つぎに、フォトリソグラフィにより裏面開口部形成のためのレジストパターンを形成する。つぎに、上記レジストパターンをマスクにして、保護膜をドライエッチングし、開口部とする部分の保護膜を除去する。つぎに、レジストを剥離後、保護膜をマスクとして、加熱したK
OH液により基板側のSiをウェットエッチングし、開口部を形成する。このウェットエッチングはSOI基板の貼合わせ層であるSiO2膜で停止する。つぎに、活性層側に電子線レジストを塗布し、電子線描画により透過孔を形成するためのレジストパターンを形成する。つぎに、レジストパターンをマスクにして、活性層のSiをドライエッチングし、透過孔を形成する。つぎに、電子線レジストを剥離して本例の極端紫外線露光マスクとすることができる。
First, an SOI (active layer / insulating layer (SiO 2 ) / substrate (Si) layer structure) in which the upper active layer is a thin film satisfying the above conditions and the thickness of the active layer is 5 μm is prepared. Next, a protective film (such as SiN formed by CVD or sputtering) is formed on the back surface. Next, a resist pattern for forming a back surface opening is formed by photolithography. Next, using the resist pattern as a mask, the protective film is dry-etched to remove the portion of the protective film that becomes the opening. Next, after peeling off the resist, the film was heated using the protective film as a mask.
Si on the substrate side is wet-etched with OH liquid to form an opening. This wet etching stops at the SiO 2 film which is the bonding layer of the SOI substrate. Next, an electron beam resist is applied to the active layer side, and a resist pattern for forming transmission holes is formed by electron beam drawing. Next, using the resist pattern as a mask, Si in the active layer is dry etched to form transmission holes. Next, the electron beam resist can be peeled off to obtain the extreme ultraviolet exposure mask of this example.

<例4>
また本発明の極端紫外線露光マスクとして、前記極端紫外線を吸収する薄膜1の部分を透過する透過光の、入射光に対する透過率Tが3〜13%であり、さらにTと、前記透過孔2を透過する透過光の、入射光に対する透過率T0の位相差がπの奇数倍である極端紫外線露光用マスクを例示できる。
<Example 4>
Further, as the extreme ultraviolet exposure mask of the present invention, the transmittance T of the transmitted light transmitted through the portion of the thin film 1 that absorbs the extreme ultraviolet light is 3 to 13% with respect to the incident light. A mask for extreme ultraviolet exposure in which the phase difference of transmittance T0 of transmitted light with respect to incident light is an odd multiple of π can be exemplified.

従来のKrFやArF用のマスクでは、利用できる位相差(PS)は実際上πの値しか有り得ないのに対し、EUVマスクでは屈折率が1に近いので3πや5πも実現可能である。   In the conventional KrF and ArF masks, the phase difference (PS) that can be used can actually be only π, whereas in the EUV mask, since the refractive index is close to 1, 3π and 5π can be realized.

本例の極端紫外線露光マスクとして、ハーフトーンマスクを例として説明する。   A halftone mask will be described as an example of the extreme ultraviolet exposure mask of this example.

<比較例1>
まず比較のため、Siを薄膜材料としたマスクについて説明する。
<Comparative Example 1>
First, for comparison, a mask using Si as a thin film material will be described.

EUV光として波長13.5nmの光とし、EUV光を吸収する部分の薄膜材料としてSiを選び、Siの膜厚に対し、透過率Tと、TとT0の位相差PSを計算した結果を図4に示す。図で横軸は膜厚の値、縦軸はTとPSの値を示し、PSについては3.14(=π)の値のみ示した。図4より、PS=πのとき、Tはすでに1%よりはるかに小さく、ハーフトーンマスクとしては不適である。これは、Siの屈折率が真空の屈折率=1に近いため、位相差を確保するには膜厚を厚くしなければならないからである。   Fig. 5 shows the result of calculating transmittance T and phase difference PS between T and T0 with respect to the thickness of Si by selecting EU as light with a wavelength of 13.5 nm as EUV light and selecting Si as a thin film material for absorbing EUV light. 4 shows. In the figure, the horizontal axis represents the film thickness value, the vertical axis represents the values of T and PS, and only the value of 3.14 (= π) is shown for PS. From FIG. 4, when PS = π, T is already much smaller than 1%, which is not suitable as a halftone mask. This is because the refractive index of Si is close to the refractive index of vacuum = 1, so that the film thickness must be increased to ensure the phase difference.

<比較例2>
さらに比較の為に、Bを1%ドープしたSiを薄膜材料としたマスクについて説明する。
図4と同様、EUV光として波長13.5nmの光とし、EUV光を吸収する部分の薄膜材料としてBを1%ドープしたSiを選び、BドープSiの膜厚に対し透過率Tと、TとT0の位相差PSを計算した結果を図5に示す。図で横軸は膜厚の値、縦軸はTとPSの値を示し、PSについては3.14(=π)の値のみ示した。図5より、Bドープにより、屈折率の、真空の屈折率=1との差はいくらか大きくなったが、PS=πのとき、Tはまだ2%以下であり、ハーフトーンマスクとしては不適である。
<Comparative example 2>
For comparison, a mask using Si doped with 1% B as a thin film material will be described.
As in FIG. 4, light having a wavelength of 13.5 nm is selected as EUV light, and Si doped with 1% B is selected as a thin film material that absorbs EUV light. FIG. 5 shows the result of calculating the phase difference PS between T and T0. In the figure, the horizontal axis represents the film thickness value, the vertical axis represents the values of T and PS, and only the value of 3.14 (= π) is shown for PS. As shown in FIG. 5, the difference in refractive index from the vacuum refractive index = 1 is somewhat increased by B doping, but when PS = π, T is still 2% or less, which is not suitable as a halftone mask. is there.

<例5>
つぎに例4の極端紫外線露光マスクの具体例について説明する。
<Example 5>
Next, a specific example of the extreme ultraviolet exposure mask of Example 4 will be described.

本例ではBを10%ドープしたSiを薄膜材料としたマスクの場合である。   In this example, the mask is made of Si thin film material doped with 10% B.

同様に、EUV光として波長13.5nmとする。EUV光を吸収する部分の薄膜材料としてBを10%ドープしたSiを選び、BドープSiの膜厚に対し透過率Tと、TとT0の位相差PSを計算した結果を図6に示す。図で横軸は膜厚の値、縦軸はTとPSの値を示し、PSについては3.14(=π)の値のみ示した。図6より、この材料では、PS=πのとき、Tは約7%となり、ハーフトーンマスクとなることができる。   Similarly, the wavelength of EUV light is 13.5 nm. FIG. 6 shows the result of calculating the transmittance T and the phase difference PS between T and T0 with respect to the film thickness of B-doped Si by selecting Si doped with 10% B as the thin film material for the part that absorbs EUV light. In the figure, the horizontal axis represents the film thickness value, the vertical axis represents the values of T and PS, and only the value of 3.14 (= π) is shown for PS. As shown in FIG. 6, with this material, when PS = π, T is about 7%, which can be a halftone mask.

<例5の作成方法>
本例の極端紫外線露光用マスクは次ぎのようにして作成できる。
<Creation method of Example 5>
The extreme ultraviolet exposure mask of this example can be prepared as follows.

活性層の厚みが約2.2μm(図6参照)であり、活性層にBを10%ドープしたSOI基板を用意する。つぎに、裏面に保護膜(CVDやスパッタにより成膜したSiNなど)を成膜し、以後、例3の作成方法と同様にして本例の極端紫外線露光用マスクを作成できる。   An SOI substrate having an active layer thickness of about 2.2 μm (see FIG. 6) and an active layer doped with 10% B is prepared. Next, a protective film (SiN or the like formed by CVD or sputtering) is formed on the back surface, and thereafter, the extreme ultraviolet exposure mask of this example can be produced in the same manner as the production method of Example 3.

<例6>
本例では例4でSiNを薄膜材料としたマスクの場合である。
<Example 6>
In this example, the mask is made of SiN as a thin film material in Example 4.

同様に、EUV光として波長13.5nmとする。EUV光を吸収する部分の薄膜材料としてSiNを選び、SiNの膜厚に対し透過率Tと、TとT0の位相差PSを計算した結果を図7に示す。図で横軸は膜厚の値、縦軸はTとPSの値を示し、PSについては9.42(=3π)の値のみ示した。図7より、SiNでは、PS=3πのとき、Tは約4.5%となり、ハーフトーンマスクとすることができる。   Similarly, the wavelength of EUV light is 13.5 nm. FIG. 7 shows the result of calculating the transmittance T and the phase difference PS between T and T0 with respect to the thickness of the SiN film by selecting SiN as the thin film material for the part that absorbs EUV light. In the figure, the horizontal axis shows the film thickness value, the vertical axis shows the values of T and PS, and only the value of 9.42 (= 3π) is shown for PS. From FIG. 7, in SiN, when PS = 3π, T is about 4.5%, and a halftone mask can be obtained.

<例6の作成方法>
単結晶Si基板の表側に、CVD法やスパッタにより厚みが約0.35μm(図7参照)のSiN膜を形成する。つぎに、裏側に保護膜(CVDやスパッタにより成膜したSiNなど)を成膜する。つぎに、フォトリソグラフィにより裏側開口部形成のためのレジストパターンを形成する。つぎに、上記レジストパターンをマスクにして、保護膜をドライエッチングし、開口部とする部分の保護膜を除去する。つぎに、レジストを剥離後、保護膜をマスクとして、加熱したKOH液により基板側のSiをウェットエッチングし、開口部を形成する。このウェットエッチは表側に形成したSiN膜で停止する。つぎに、表側に電子線レジストを塗布し、電子線描画により透過孔を形成するためのレジストパターンを形成する。つぎに、レジストパターンをマスクにして、SiN膜をドライエッチングし、透過孔を形成する。つぎに、電子線レジストを剥離して、ハーフトーンマスクとすることが出来る。
<Method for creating example 6>
A SiN film having a thickness of about 0.35 μm (see FIG. 7) is formed on the front side of the single crystal Si substrate by CVD or sputtering. Next, a protective film (SiN formed by CVD or sputtering) is formed on the back side. Next, a resist pattern for forming the back side opening is formed by photolithography. Next, using the resist pattern as a mask, the protective film is dry-etched to remove the portion of the protective film that becomes the opening. Next, after peeling off the resist, Si on the substrate side is wet-etched with a heated KOH solution using the protective film as a mask to form an opening. This wet etching stops at the SiN film formed on the front side. Next, an electron beam resist is applied to the front side, and a resist pattern for forming transmission holes is formed by electron beam drawing. Next, using the resist pattern as a mask, the SiN film is dry etched to form transmission holes. Next, the electron beam resist can be peeled off to form a halftone mask.

<例7>
本例では例4で、SiCを薄膜材料としたマスクの場合である。
<Example 7>
This example is the case of Example 4, which is a mask using SiC as a thin film material.

同様に、EUV光として波長13.5nm、EUV光を吸収する部分の薄膜材料としてSiCを選び、SiCの膜厚に対し透過率Tと、TとT0の位相差PSを計算した結果を図8に示す。図で横軸は膜厚の値、縦軸はTとPSの値を示し、PSについては9.42(=3π)の値のみ示した。図8より、SiCでは、PS=3πのとき、Tは約8%となり、ハーフトーンマスクとなることができる。   Similarly, when the wavelength is 13.5 nm as EUV light and SiC is selected as a thin film material for the part that absorbs EUV light, the transmittance T and the phase difference PS between T and T0 are calculated with respect to the film thickness of SiC. Shown in In the figure, the horizontal axis shows the film thickness value, the vertical axis shows the values of T and PS, and only the value of 9.42 (= 3π) is shown for PS. From FIG. 8, in SiC, when PS = 3π, T is about 8%, and can be a halftone mask.

<例7の作成方法>
単結晶Si基板の表側に、CVD法やスパッタにより厚みが約0.6μm(図8参照)のSiC膜を形成する。つぎに、裏側に保護膜(CVDやスパッタにより成膜したSiNなど)を成膜し、以下、裏側ウェットエッチの停止層がSiC膜である以外は、例6の作成方法と同様である。
<How to create Example 7>
A SiC film having a thickness of about 0.6 μm (see FIG. 8) is formed on the front side of the single crystal Si substrate by CVD or sputtering. Then, a protective film (SiN or the like formed by CVD or sputtering) is formed on the back side, and the same method as in Example 6 is applied except that the back side wet etch stop layer is a SiC film.

<例8>
本例では例4で、DLC膜を薄膜材料としたマスクの場合である。
<Example 8>
This example is the case of Example 4 in which the DLC film is a mask made of a thin film material.

同様に、EUV光として波長13.5nm、EUV光を吸収する部分の薄膜材料としてDLC(ダイヤモンドライクカーボン)を選び、DLCの膜厚に対し透過率Tと、TとT
0の位相差PSを計算した結果を図9に示す。図で横軸は膜厚の値、縦軸はTとPSの値を示し、PSについては15.7(=5π)の値のみ示した。図9より、DLC膜では、PS=5πのとき、Tは約7%となり、ハーフトーンマスクとなることができる。
Similarly, a wavelength of 13.5 nm is selected as EUV light, and DLC (diamond-like carbon) is selected as a thin film material for the part that absorbs EUV light.
The result of calculating the phase difference PS of 0 is shown in FIG. In the figure, the horizontal axis represents the film thickness value, the vertical axis represents the T and PS values, and only the value of 15.7 (= 5π) is shown for PS. As shown in FIG. 9, in the DLC film, when PS = 5π, T is about 7% and can be a halftone mask.

<例8の作成方法>
単結晶Si基板の表側に、CVD法により厚みが約0.45μm(図9参照)のDLC膜を形成する。つぎに、裏側に保護膜(CVDやスパッタにより成膜したSiNなど)を成膜し、以下、裏側ウェットエッチの停止層がDLC膜である以外は、例6の作成方法と同様である。
<Method for creating example 8>
A DLC film having a thickness of about 0.45 μm (see FIG. 9) is formed on the front side of the single crystal Si substrate by a CVD method. Next, a protective film (SiN or the like formed by CVD or sputtering) is formed on the back side, and the following method is the same as that of Example 6 except that the back side wet etch stop layer is a DLC film.

<例9>
本例では例4で、ダイヤモンド膜を薄膜材料としたマスクの場合である。
<Example 9>
This example is the case of Example 4, which is a mask using a diamond film as a thin film material.

同様に、EUV光として波長13.5nm、EUV光を吸収する部分の薄膜材料としてダイヤモンド膜を選び、ダイヤモンド膜厚に対し透過率Tと、TとT0の位相差PSを計算した結果を図10に示す。図で横軸は膜厚の値、縦軸はTとPSの値を示し、PSについては15.7(=5π)の値のみ示した。図10より、ダイヤモンド膜では、PS=5πのとき、Tは約7.5%となり、ハーフトーンマスクとなることができる。   Similarly, a wavelength of 13.5 nm is selected as EUV light, and a diamond film is selected as a thin film material that absorbs EUV light. The transmittance T and the phase difference PS between T and T0 are calculated with respect to the diamond film thickness. Shown in In the figure, the horizontal axis represents the film thickness value, the vertical axis represents the T and PS values, and only the value of 15.7 (= 5π) is shown for PS. As shown in FIG. 10, in the diamond film, when PS = 5π, T is about 7.5% and can be a halftone mask.

<例9の作成方法>
単結晶Si基板の表側に、CVD法により厚みが約0.3μm(図10参照)のダイヤモンド膜を形成する。つぎに、裏側に保護膜(CVDやスパッタにより成膜したSiNなど)を成膜し、以下、裏側ウェットエッチの停止層がダイヤモンド膜である以外は、例6の作成方法と同様である。
<Method for creating example 9>
A diamond film having a thickness of about 0.3 μm (see FIG. 10) is formed by CVD on the front side of the single crystal Si substrate. Next, a protective film (SiN or the like formed by CVD or sputtering) is formed on the back side, and the same method as in Example 6 is applied except that the back side wet etch stop layer is a diamond film.

本発明の極端紫外線露光用マスクの一例を断面で示す説明図である。It is explanatory drawing which shows an example of the mask for extreme ultraviolet exposures of this invention in a cross section. 従来の極端紫外線露光用マスクの一例を断面で示す説明図である。It is explanatory drawing which shows an example of the conventional mask for extreme ultraviolet exposure in a cross section. 本発明の極端紫外線露光用マスクの他の例の透過率、D値の特性を示す説明図である。It is explanatory drawing which shows the characteristic of the transmittance | permeability of another example of the mask for extreme ultraviolet exposures of this invention, and D value. 本発明の極端紫外線露光用マスクの比較例の透過率、位相差の特性を示す説明図である。It is explanatory drawing which shows the characteristic of the transmittance | permeability of a comparative example of the mask for extreme ultraviolet exposures of this invention, and a phase difference. 本発明の極端紫外線露光用マスクの他の比較例の透過率、位相差の特性を示す説明図である。It is explanatory drawing which shows the characteristic of the transmittance | permeability of another comparative example of the mask for extreme ultraviolet exposures of this invention, and a phase difference. 本発明の極端紫外線露光用マスクのその他の例の透過率、位相差の特性を示す説明図である。It is explanatory drawing which shows the characteristic of the transmittance | permeability of another example of the mask for extreme ultraviolet exposures of this invention, and a phase difference. 本発明の極端紫外線露光用マスクのその他の例の透過率、位相差の特性を示す説明図である。It is explanatory drawing which shows the characteristic of the transmittance | permeability of another example of the mask for extreme ultraviolet exposures of this invention, and a phase difference. 本発明の極端紫外線露光用マスクのその他の例の透過率、位相差の特性を示す説明図である。It is explanatory drawing which shows the characteristic of the transmittance | permeability of another example of the mask for extreme ultraviolet exposures of this invention, and a phase difference. 本発明の極端紫外線露光用マスクのその他の例の透過率、位相差の特性を示す説明図である。It is explanatory drawing which shows the characteristic of the transmittance | permeability of another example of the mask for extreme ultraviolet exposures of this invention, and a phase difference. 本発明の極端紫外線露光用マスクのその他の例の透過率、位相差の特性を示す説明図である。It is explanatory drawing which shows the characteristic of the transmittance | permeability of another example of the mask for extreme ultraviolet exposures of this invention, and a phase difference.

符号の説明Explanation of symbols

1・・・薄膜
2・・・透過孔
3・・・基板
11・・・基板
12・・・EUV光高反射率多層膜
13・・・キャッピング膜
14・・・緩衝膜
15・・・EUV光吸収膜
DESCRIPTION OF SYMBOLS 1 ... Thin film 2 ... Transmission hole 3 ... Substrate 11 ... Substrate 12 ... EUV light high reflectance multilayer film 13 ... Capping film 14 ... Buffer film 15 ... EUV light Absorption membrane

Claims (4)

極端紫外線を吸収する薄膜の部分と、前記紫外線を透過するために前記薄膜に開口した透過孔の部分からなる極端紫外線露光用マスクであって、
1)前記極端紫外線を吸収する薄膜の部分を透過する透過光の、入射光に対する透過率をT、前記透過孔を透過する透過光の、入射光に対する透過率をT0とするとき、Tが3〜13%であり、さらにTとT 0 の位相差がπの奇数倍であり、
)前記極端紫外線を吸収する薄膜の部分が下記材料群の1つを主成分とすることを特徴とする極端紫外線露光用マスク。
(Si、BをドープしたSi、SiC、SiN、DLC膜、ダイヤモンド膜)
A mask for extreme ultraviolet exposure comprising a portion of a thin film that absorbs extreme ultraviolet light and a portion of a transmission hole that is opened in the thin film to transmit the ultraviolet light,
1) When T is the transmittance of the transmitted light that is transmitted through the portion of the thin film that absorbs extreme ultraviolet rays, and T 0 is the transmittance of the transmitted light that is transmitted through the transmission hole, and T is 3 to 13%, and the phase difference between T and T 0 is an odd multiple of π,
2 ) A mask for extreme ultraviolet exposure, wherein the portion of the thin film that absorbs extreme ultraviolet rays contains one of the following material groups as a main component.
(Si, SiC doped with Si, B, SiN, DLC film, diamond film)
活性層/絶縁層(SiO2)/基板(Si)層を構成したSOI基板の活性層を、請求項1に記載の極端紫外線を吸収する薄膜と同じ材料としたSOI基板を用意し、基板層側に保護膜を成膜し、フォトリソグラフィにより裏面開口部形成のためのレジストパターンを形成し、レジストパターンをマスクにして保護膜をドライエッチングし開口部とする部分の保護膜を除去し、レジストを剥離後保護膜をマスクとして、基板層側のSiをエッチングし開口部を形成し、活性層側に電子線レジストを塗布し電子線描画により透過孔を形成するためのレジストパターンを形成し、レジストパターンをマスクにして活性層をドライエッチングし透過孔を形成し、電子線レジストを剥離することを特徴とする極端紫外線露光マスクの製造方法。 An SOI substrate in which an active layer of an SOI substrate constituting an active layer / insulating layer (SiO 2 ) / substrate (Si) layer is made of the same material as the thin film that absorbs extreme ultraviolet rays according to claim 1 is prepared. A protective film is formed on the side, a resist pattern for forming the back surface opening is formed by photolithography, and the protective film is dry-etched using the resist pattern as a mask to remove the protective film in the portion to be the opening, and the resist After peeling off, using the protective film as a mask, etching the Si on the substrate layer side to form an opening, applying an electron beam resist to the active layer side, forming a resist pattern for forming a transmission hole by electron beam drawing, A method for producing an extreme ultraviolet exposure mask, wherein the active layer is dry-etched using a resist pattern as a mask to form a transmission hole, and the electron beam resist is peeled off. 単結晶Si基板の表側に、請求項1に記載のSiC、SiN、DLC膜、ダイヤモンド膜いずれかの材料を主成分とした極端紫外線を吸収する薄膜を形成し、裏側に保護膜成膜し、フォトリソグラフィにより裏側開口部形成のためのレジストパターンを形成し、レジストパターンをマスクにして保護膜をドライエッチングし開口部とする部分の保護膜を除去し、レジストを剥離後保護膜をマスクとして基板側のSiをエッチングし開口部を形成し、表側に電子線レジストを塗布し電子線描画により透過孔を形成するためのレジストパターンを形成し、レジストパターンをマスクにしてSiC、SiN、DLC膜、ダイヤモンド膜のいずれかの薄膜をドライエッチングし透過孔を形成し、電子線レジストを剥離することを特徴とする極端紫外線露光マスクの製造方法。   A thin film that absorbs extreme ultraviolet rays mainly composed of any of the SiC, SiN, DLC film, and diamond film according to claim 1 is formed on the front side of the single crystal Si substrate, and a protective film is formed on the back side. A resist pattern for forming the back side opening is formed by photolithography, and the protective film is dry etched using the resist pattern as a mask to remove the portion of the protective film that becomes the opening, and after removing the resist, the substrate using the protective film as a mask Side Si is etched to form an opening, an electron beam resist is applied to the front side, a resist pattern for forming a transmission hole is formed by electron beam drawing, and a SiC, SiN, DLC film, Extreme ultraviolet rays characterized by dry etching any thin film of diamond film to form transmission holes and peeling electron beam resist The method of manufacturing an optical mask. 請求項1に記載の極端紫外線露光用マスク、または請求項2または3に記載の極端紫外線露光マスクの製造方法で製造された極端紫外線露光マスクに極端紫外線を照射し、転写パターンの形状に極端紫外線を成形する工程を具備することを特徴とする極端紫外線の露光方法。   The extreme ultraviolet exposure mask according to claim 1 or the extreme ultraviolet exposure mask produced by the method for producing an extreme ultraviolet exposure mask according to claim 2 or 3 is irradiated with extreme ultraviolet rays, and the shape of the transfer pattern is changed to extreme ultraviolet rays. A method of exposing to extreme ultraviolet rays, comprising the step of molding
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JPS59184526A (en) * 1983-04-05 1984-10-19 Agency Of Ind Science & Technol Formation of pattern
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JPH03211554A (en) * 1990-01-17 1991-09-17 Fujitsu Ltd Production of phase shift mask
JPH0817716A (en) * 1994-06-29 1996-01-19 Nikon Corp Manufacture of reflection-type mask
JPH10321495A (en) * 1997-05-14 1998-12-04 Toppan Printing Co Ltd X-ray exposure mask and its manufacture
JP3399839B2 (en) * 1998-06-24 2003-04-21 日本電信電話株式会社 X-ray mask and X-ray exposure method using the same
JP2002299277A (en) * 2001-03-30 2002-10-11 Toshiba Corp Manufacturing method for thin-film structural unit
JP2003338447A (en) * 2002-05-21 2003-11-28 Mitsubishi Electric Corp X-ray mask, x-ray aligner, x-ray exposure method, and semiconductor manufactured thereby

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