JP2009027061A - Method of forming thin film - Google Patents

Method of forming thin film Download PDF

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JP2009027061A
JP2009027061A JP2007190459A JP2007190459A JP2009027061A JP 2009027061 A JP2009027061 A JP 2009027061A JP 2007190459 A JP2007190459 A JP 2007190459A JP 2007190459 A JP2007190459 A JP 2007190459A JP 2009027061 A JP2009027061 A JP 2009027061A
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film
barrier metal
metal film
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forming
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JP5220357B2 (en
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Tomoyuki Yoshihama
知之 吉浜
Masamichi Harada
雅通 原田
Satoshi Toyoda
聡 豊田
Harunori Ushigawa
治憲 牛川
Nobuyuki Kato
伸幸 加藤
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Ulvac Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for forming a thin film, in which the adhesiveness of a barrier metal film and a Cu film is improved. <P>SOLUTION: The method involves a step of forming the barrier metal film on a surface of a matter to be treated by the PVD method, a step of forming the Cu film on the barrier metal film surface by the CVD method, and a step of heat-treating the laminate of the barrier film and the Cu film at a prescribed temperature. The barrier metal film to be used contains Ti and Ru, and has a composition ratio of Ti of 5 to 25 atom%. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、薄膜形成方法に関し、特に、半導体装置の銅配線技術に利用され、バリアメタル膜とCu膜との密着性を向上できる薄膜形成方法に関する。   The present invention relates to a thin film forming method, and more particularly, to a thin film forming method that can be used in copper wiring technology of a semiconductor device and can improve adhesion between a barrier metal film and a Cu film.

従来、半導体装置の銅配線技術においては、Siウエハなどの基板表面の絶縁膜中に配線用の溝やホールを形成した後、Cu膜の形成に先立って、絶縁膜へのCuの拡散を防止するためにTiまたはTaを含むバリアメタル膜を形成することが一般に知られている。このようにバリアメタル膜を形成する場合、その後に実施されるCMP工程などの諸工程において耐えられるようなバイアメタル層とCu層との密着性が求められる。   Conventionally, in the copper wiring technology of semiconductor devices, after forming a groove or hole for wiring in an insulating film on the surface of a substrate such as a Si wafer, the diffusion of Cu into the insulating film is prevented prior to the formation of the Cu film. For this purpose, it is generally known to form a barrier metal film containing Ti or Ta. Thus, when forming a barrier metal film, the adhesiveness of the via metal layer and Cu layer which can be borne in processes, such as CMP process implemented after that, is calculated | required.

そこで、PVD法たるスパッタリング法によりバリアメタル膜としてTi膜又はTa膜を形成した後、このバリアメタル膜表面に、スパッタリング法により窒化物膜または窒素原子を含むガスを吸着させて窒素原子を含む層を形成し、そして、CVD法によりCu膜を形成した後、所定の温度で熱処理することが特許文献1で知られている。
国際公開WO2007/64012号公報
Therefore, after a Ti film or a Ta film is formed as a barrier metal film by a sputtering method which is a PVD method, a nitride film or a gas containing nitrogen atoms is adsorbed on the surface of the barrier metal film by a sputtering method. It is known in Patent Document 1 that after heat treatment is performed and a Cu film is formed by a CVD method, heat treatment is performed at a predetermined temperature.
International Publication WO2007 / 64012

上記特許文献1記載のものでは、バリアメタル膜を形成した後に窒化金属膜等からなる層を形成することで、この層が活性な金属吸着サイトを占有し、バリアメタル膜形成直後のその表面での酸素、フッ素化合物、水、アンモニア等の不純物との反応生成物層(例えば、不純物が酸素である場合、チタンとの反応によるチタン酸化物等のような層)の形成が抑制される。その結果、熱処理時にバリアメタルとCuとが効率よく相互拡散することで密着性が向上する。然し、このものでは、CMP工程などの諸工程で十分に耐えることができ、歩留まりが向上するようなバリアメタル層とCu層との密着性を得るには、熱処理時の加熱温度を350℃程度に設定する必要があった。   In the above-mentioned Patent Document 1, by forming a layer made of a metal nitride film after forming a barrier metal film, this layer occupies an active metal adsorption site, and on the surface immediately after the barrier metal film is formed. Formation of a reaction product layer with impurities such as oxygen, fluorine compounds, water, and ammonia (for example, when the impurity is oxygen, formation of a layer such as titanium oxide by reaction with titanium) is suppressed. As a result, the barrier metal and Cu are efficiently interdiffused during the heat treatment, thereby improving the adhesion. However, in this case, in order to obtain adhesion between the barrier metal layer and the Cu layer that can sufficiently withstand various processes such as the CMP process and improve the yield, the heating temperature during the heat treatment is about 350 ° C. Had to be set to

他方で、近年の半導体装置の高集積化、微細化に伴い、低誘電率化が求められている層間絶縁膜として、例えば空孔が規則的に配列された多孔質薄膜を用いる場合、この多孔質薄膜の性能を維持するためには、上記熱処理時の温度を300℃以下、好ましくは250℃程度の温度まで低くすることが望まれている。   On the other hand, when a porous thin film in which pores are regularly arranged is used as an interlayer insulating film that is required to have a low dielectric constant in accordance with recent high integration and miniaturization of semiconductor devices, In order to maintain the performance of the thin film, it is desired to lower the temperature during the heat treatment to a temperature of 300 ° C. or lower, preferably about 250 ° C.

そこで、本発明の課題は、上記点に鑑み、バリアメタル層に本来求められるバリア性を維持しつつ、300℃以下の低い温度で熱処理してもバリアメタル層とCu層との間で十分な密着性が得られるようにした薄膜形成方法を提供することにある。   Therefore, in view of the above points, the problem of the present invention is that the barrier metal layer is sufficiently provided between the barrier metal layer and the Cu layer even if heat treatment is performed at a low temperature of 300 ° C. or lower while maintaining the barrier property originally required for the barrier metal layer. An object of the present invention is to provide a method for forming a thin film in which adhesion can be obtained.

上記課題を解決するために、本発明の薄膜形成方法は、被処理物表面にPVD法によりバリアメタル膜を形成する工程と、このバリアメタル膜表面にCVD法によりCu膜を形成する工程と、前記バリア膜及びCu膜を積層したものを所定温度で熱処理する工程とを含み、前記バリアメタル膜としてTi及びRuを含むものを用い、当該バリアメタル膜中のTiの組成比を5〜25原子%の範囲とすることを特徴とする。   In order to solve the above problems, a thin film forming method of the present invention includes a step of forming a barrier metal film on a surface of an object to be processed by a PVD method, a step of forming a Cu film on the surface of the barrier metal film by a CVD method, And a step of heat-treating the laminate of the barrier film and the Cu film at a predetermined temperature. The barrier metal film containing Ti and Ru is used, and the composition ratio of Ti in the barrier metal film is 5 to 25 atoms. % Range.

また、本発明においては、前記PVD法はスパッタリング法であり、ターゲットとして、所定形状を有するTi製のターゲットのスパッタ面中央領域に、所定形状を有するRu製のターゲットを配置したものを用い、プラズマの形状を調節して前記組成比のバリアメタル膜を得るようにする。   Further, in the present invention, the PVD method is a sputtering method, and a target in which a Ru target having a predetermined shape is disposed in a central region of a sputtering surface of a Ti target having a predetermined shape is used as a target. The barrier metal film having the above composition ratio is obtained by adjusting the shape.

本発明によれば、バリアメタル膜として、Ti及びRuを含むものを用い、バリアメタル膜中のTiの組成比を所定の範囲に設定することで、250℃という低温で熱処理を行っても、本来求められるバリア性を維持しつつ十分な密着性が確保でき、また、形成される膜におけるCuのストレスマイグレーションがなく耐性も向上する。その際、Tiの組成比が5原子%より小さいと、本来バリアメタル層に求められるバリア性が不十分となり、他方で、25原子%を超えると、バリアメタル層とCu層との間の密着性が低下し、CMP処理等の後工程で剥離してしまう虞がある。   According to the present invention, using a barrier metal film containing Ti and Ru, and setting the composition ratio of Ti in the barrier metal film within a predetermined range, even if heat treatment is performed at a low temperature of 250 ° C., Sufficient adhesion can be ensured while maintaining the originally required barrier property, and resistance is improved because there is no stress migration of Cu in the formed film. At that time, if the Ti composition ratio is smaller than 5 atomic%, the barrier property originally required for the barrier metal layer becomes insufficient. On the other hand, if it exceeds 25 atomic%, the adhesion between the barrier metal layer and the Cu layer is insufficient. There is a risk that the property will be lowered and the film may be peeled off in a subsequent process such as a CMP process.

本実施の形態では、被処理物として、例えばSiウエハ表面にシリコン酸化物膜(絶縁膜)を形成した後、このシリコン酸化物膜中に配線用の溝やホールを形成したものが用いられる。そして、本発明の薄膜形成方法を実施して、これらの溝やホールに、被処理物表面にPVD法によりTiとRuとからなるバリアメタル膜を形成する工程と、このバリアメタル膜表面にCVD法によりCu膜を形成する工程と、バリア膜及びCu膜が積層されたものを所定温度で熱処理する工程とが実施される。   In the present embodiment, as the object to be processed, for example, a silicon oxide film (insulating film) is formed on the surface of a Si wafer and then a wiring groove or hole is formed in the silicon oxide film. Then, the thin film forming method of the present invention is carried out, and a step of forming a barrier metal film made of Ti and Ru on the surface of the object to be processed by PVD method in these grooves and holes, and CVD on the surface of the barrier metal film. A step of forming a Cu film by a method and a step of heat-treating a laminate of the barrier film and the Cu film at a predetermined temperature are performed.

バリアメタル膜は、当該バリアメタル膜中のTiの組成比が5〜25原子%の範囲となるように、公知の構造を有するマグネトロン方式のスパッタリング(PVD)装置により所定の膜厚(例えば、15nm)で形成される。図1に示すように、スパッタリング装置1は、ロータリーポンプ、ターボ分子ポンプなどの真空排気手段(図示せず)を介して所定の真空圧に保持できるスパッタ室2を有する。   The barrier metal film has a predetermined film thickness (for example, 15 nm) by a magnetron sputtering (PVD) apparatus having a known structure so that the composition ratio of Ti in the barrier metal film is in the range of 5 to 25 atomic%. ). As shown in FIG. 1, the sputtering apparatus 1 has a sputtering chamber 2 that can be maintained at a predetermined vacuum pressure via vacuum exhaust means (not shown) such as a rotary pump and a turbo molecular pump.

スパッタ室2には、アルゴンなどのスパッタガスを一定の流量で導入するガス導入手段3が設けられている。また、スパッタ室2下側には、マグネトロンスパッタ電極Cが配置される。このマグネトロンスパッタ電極Cは、所定形状のターゲット4と、このターゲット4のスパッタ面4aの背面側に配置された磁石組立体5とを有する。   The sputtering chamber 2 is provided with gas introduction means 3 for introducing a sputtering gas such as argon at a constant flow rate. A magnetron sputtering electrode C is disposed below the sputtering chamber 2. The magnetron sputter electrode C has a target 4 having a predetermined shape and a magnet assembly 5 disposed on the back side of the sputter surface 4a of the target 4.

ここで、ターゲット4としては、バリアメタル膜中のTiの組成比(原子%)が上記範囲内で適宜調節できるように、公知の方法で平面視円形等の所定形状に製作したTiターゲット41の中央領域に、Tiターゲット41の外形に相似の凹部41aを設け、この凹部41aに、公知の方法で製作したRuターゲット42を、スパッタ面4aが同一平面上に位置するように嵌合することで作製したものが用いられる(図2(a)及び図2(b)参照)。なお、所定の重量比でTiとRuとを混合して作製した合金ターゲットを用いることもできる。   Here, as the target 4, a Ti target 41 manufactured in a predetermined shape such as a circular shape in a plan view by a known method so that the Ti composition ratio (atomic%) in the barrier metal film can be appropriately adjusted within the above range. A recess 41a similar to the outer shape of the Ti target 41 is provided in the central region, and a Ru target 42 manufactured by a known method is fitted into the recess 41a so that the sputter surface 4a is positioned on the same plane. What was produced is used (refer Fig.2 (a) and FIG.2 (b)). An alloy target prepared by mixing Ti and Ru at a predetermined weight ratio can also be used.

他方、磁石組立体5は、公知の構造を有し、ターゲット4のスパッタ面4aの前方に閉ループのトンネル状の磁束Mを形成するように、複数の磁石5a、5bをターゲット4側の極性を適宜変えて配置したものである。   On the other hand, the magnet assembly 5 has a known structure, and a plurality of magnets 5a and 5b are polarized on the target 4 side so as to form a closed-loop tunnel-like magnetic flux M in front of the sputtering surface 4a of the target 4. The arrangement is changed as appropriate.

そして、スパッタ室2を所定の圧力まで真空排気した後、上記被処理物Sをターゲット4と対向した位置に搬送する。次いで、ガス導入手段3を介してArを導入すると共に、スパッタ電源Eを介してターゲット4に負の直流電圧を印加する。これにより、被処理物S及びターゲット4に垂直な電界が形成され、ターゲット4の前方にプラズマが発生してターゲット4がスパッタされ、被処理物S表面に主としてRuからなり、かつ、Tiを含有するバリアメタル膜が形成される。   Then, after the sputtering chamber 2 is evacuated to a predetermined pressure, the workpiece S is transferred to a position facing the target 4. Next, Ar is introduced through the gas introduction means 3 and a negative DC voltage is applied to the target 4 through the sputtering power source E. Thereby, an electric field perpendicular to the object to be processed S and the target 4 is formed, plasma is generated in front of the target 4 and the target 4 is sputtered, and the surface of the object to be processed S is mainly made of Ru and contains Ti. A barrier metal film is formed.

このスパッタリングの際には、磁石組立体5を構成する各磁石5a、5bの配置を変更してターゲット4前方でのプラズマの形状を適宜調節することで、ターゲット4のスパッタ領域を変化させ(つまり、Tiのスパッタ領域を増減させ)、上記範囲の組成比を有するバリアメタル膜が形成される。   In this sputtering, the sputtering region of the target 4 is changed by changing the arrangement of the magnets 5a and 5b constituting the magnet assembly 5 and appropriately adjusting the shape of the plasma in front of the target 4 (that is, , The sputtering region of Ti is increased or decreased), and a barrier metal film having a composition ratio in the above range is formed.

次に、バリアメタル膜表面には、CVD装置によりCu膜が所定の膜厚(例えば、100nm)で形成される。CVD装置としては、公知の構造を有するものが利用されるため、ここでは詳細な説明を省略する。また、原料ガスについても特に制限はなく、銅含有有機化合物、例えばCu(hfac)(tmvs)を用いることができる。そして、原料ガスとしてCu(hfac)(tmvs)を用い、この原料ガスを処理室内に配置した被処理物に供給してCu膜の形成が行われる。原料ガスとしてCu(hfac)(tmvs)を用いる場合には、例えば、処理室内の圧力を100〜200Pa、被処理物の加熱温度を180〜220℃に設定すればよい。   Next, a Cu film is formed on the barrier metal film surface with a predetermined film thickness (for example, 100 nm) by a CVD apparatus. Since a CVD apparatus having a known structure is used, detailed description is omitted here. The source gas is not particularly limited, and a copper-containing organic compound such as Cu (hfac) (tmvs) can be used. Then, Cu (hfac) (tmvs) is used as the source gas, and this source gas is supplied to the object to be processed arranged in the processing chamber to form a Cu film. In the case where Cu (hfac) (tmvs) is used as the source gas, for example, the pressure in the processing chamber may be set to 100 to 200 Pa, and the heating temperature of the object to be processed may be set to 180 to 220 ° C.

なお、Ruは還元され易いため、上記原料ガスが例えば水素ガスを含んでいるような場合には、バリアメタル膜を形成直後にバリアメタル層の表面にRuとの反応によるRuOxの層が形成されていたとしても、CVD処理の際に、還元によりRuOxの層が除去された状態でバリアメタル膜表面にCu層が形成できる。その結果、後述の熱処理時にバリアメタルとCuとがより効率よく相互拡散させることが可能になる。   Since Ru is easy to be reduced, a RuOx layer is formed on the surface of the barrier metal layer immediately after the barrier metal film is formed by reaction with Ru when the source gas contains, for example, hydrogen gas. Even if it is, during the CVD process, a Cu layer can be formed on the surface of the barrier metal film with the RuOx layer removed by reduction. As a result, the barrier metal and Cu can be more efficiently interdiffused during the heat treatment described later.

次に、バリアメタル膜表面に所定の膜厚のCu膜を形成した後、300℃以下の温度、好ましくは250℃で熱処理が行われる。熱処理装置としては、真空チャンバと、赤外線ランプなどの加熱手段とを具備する公知の構造の熱処理炉が用いられる。この場合、被処理物の加熱温度を250℃、加熱時間3分に設定すればよい。これにより、バリアメタルとCuとが効率よく相互拡散して相互に密着する。その際、バリアメタル膜としてTi及びRuからなる膜を用い、バリアメタル膜中のTiの組成比を所定の範囲としたことで、250℃という低温で熱処理を行ってもバリア性を維持しつつ十分な密着性を確保でき、また、形成される膜におけるCuのストレスマイグレーションがなく耐性も向上する。   Next, after a Cu film having a predetermined thickness is formed on the surface of the barrier metal film, heat treatment is performed at a temperature of 300 ° C. or lower, preferably 250 ° C. As the heat treatment apparatus, a heat treatment furnace having a known structure including a vacuum chamber and heating means such as an infrared lamp is used. In this case, what is necessary is just to set the heating temperature of a to-be-processed object to 250 degreeC and the heating time for 3 minutes. As a result, the barrier metal and Cu are efficiently interdiffused to adhere to each other. At that time, a film made of Ti and Ru is used as the barrier metal film, and the composition ratio of Ti in the barrier metal film is set within a predetermined range, so that the barrier property is maintained even when heat treatment is performed at a low temperature of 250 ° C. Sufficient adhesion can be ensured, and there is no stress migration of Cu in the formed film, and the resistance is improved.

ここで、バリアメタル膜中のTiの組成比が5原子%より小さいと、本来バリアメタル層に求められるバリア性が不十分となり、他方で、25原子%を超えると、バリアメタル層とCu層との間の密着性が低下し、CMP処理等により剥離してしまう。   Here, when the composition ratio of Ti in the barrier metal film is smaller than 5 atomic%, the barrier property originally required for the barrier metal layer becomes insufficient. On the other hand, when it exceeds 25 atomic%, the barrier metal layer and the Cu layer The adhesion between the two decreases, and the film is peeled off by CMP treatment or the like.

なお、熱処理を行った後、Cu膜上にさらにPVD法、メッキ法、CVD法又はALD法により所定の膜厚のCu膜を形成し、次いで、250℃程度の温度で再度熱処理を行うようにしてもよい。他方、上記熱処理は、PVD法、メッキ法、CVD法又はALD法によりさらにCu膜を形成した後にのみ行ってもよい。   After heat treatment, a Cu film having a predetermined thickness is further formed on the Cu film by PVD method, plating method, CVD method or ALD method, and then heat treatment is performed again at a temperature of about 250 ° C. May be. On the other hand, the heat treatment may be performed only after a Cu film is further formed by a PVD method, a plating method, a CVD method, or an ALD method.

また、本発明の薄膜形成方法を実施するために、多関節式の搬送アームを設けた搬送室に、上記構成を有するスパッタリング装置と、CVD装置と、熱処理炉とを連結して成膜装置を構成し、真空中で上記被対象物を順次搬送して、本発明の薄膜形成方法を実施して薄膜形成を行ってもよい。   Further, in order to carry out the thin film forming method of the present invention, a sputtering apparatus having the above structure, a CVD apparatus, and a heat treatment furnace are connected to a transfer chamber provided with an articulated transfer arm to form a film forming apparatus. The thin film may be formed by performing the thin film forming method of the present invention by sequentially configuring the object to be conveyed in a vacuum.

被処理物として、公知の方法でシリコン酸化物膜(絶縁膜)を形成したSiウエハを用い、このSiウエハ表面に、図1に示すマグネトロンスパッタ装置によりRuとTiとからなるバリアメタル膜を形成した。スパッタリング条件として、スパッタ室の圧力を5×10−6Paまで真空排気した後にArガス流量を8sccm、スパッタ電源の投入電圧を400Vに設定し、バリアメタル膜を15nm厚さで形成した。 A Si wafer on which a silicon oxide film (insulating film) is formed by a known method is used as an object to be processed, and a barrier metal film made of Ru and Ti is formed on the surface of the Si wafer by a magnetron sputtering apparatus shown in FIG. did. As sputtering conditions, the pressure in the sputtering chamber was evacuated to 5 × 10 −6 Pa, the Ar gas flow rate was set to 8 sccm, the sputtering power supply voltage was set to 400 V, and the barrier metal film was formed to a thickness of 15 nm.

次いで、バリアメタル膜上に、CVD法によりCu膜を形成した。原料ガスとしてCu(hfac)(tmvs)を用い、CVD装置の処理室内の圧力を150Pa、被処理物Sの加熱温度を200℃に設定し、100nm厚さでCu膜を形成した。   Next, a Cu film was formed on the barrier metal film by a CVD method. Cu (hfac) (tmvs) was used as the source gas, the pressure in the processing chamber of the CVD apparatus was set to 150 Pa, the heating temperature of the workpiece S was set to 200 ° C., and a Cu film was formed with a thickness of 100 nm.

次いで、被処理物S表面に上記のようにバリアメタル膜及びCu膜を所定の膜厚で積層したものを熱処理炉に収納し、熱処理を施した。熱処理炉内での熱処理温度を250℃、及び処理時間3分に設定した。   Next, the laminate of the barrier metal film and the Cu film having a predetermined film thickness on the surface of the workpiece S as described above was placed in a heat treatment furnace and subjected to heat treatment. The heat treatment temperature in the heat treatment furnace was set to 250 ° C. and the treatment time was 3 minutes.

図3は、バリアメタル膜中のTiの組成比(原子%)を変化させたときのバリアメタル膜及びCu膜の密着性と、バリア性とを評価した表である。   FIG. 3 is a table evaluating the adhesion and barrier properties of the barrier metal film and Cu film when the Ti composition ratio (atomic%) in the barrier metal film is changed.

ここで、密着性は、次のような所謂テープテスト法により評価した。即ち、上記のようにして得た膜に対し、ダイヤモンドカッターにより、水平方向及び垂直方向に一定の間隔でそれぞれ10本の切り欠き線を設け、次いで、これらの切り欠き線を設けた領域に粘着テープを貼付し、剥離させた。そして、切り欠き線で囲繞された膜のうち、5%以下の面積しかテープに付着しない場合には密着性良好と評価した。   Here, the adhesion was evaluated by the following so-called tape test method. That is, 10 notch lines are provided at regular intervals in the horizontal and vertical directions with a diamond cutter on the film obtained as described above, and then the film is adhered to the area where these notch lines are provided. A tape was applied and peeled off. And when only the area of 5% or less of the film surrounded by the notch line adheres to the tape, it was evaluated as good adhesion.

他方で、バイリ性は、次のように評価した。即ち、絶縁膜中への金属イオン拡散は、100乃至300℃程度の加熱下で電圧を印加すると(以下、「BTS処理」という)、一般に加速される。このため、バイアス電圧に対する電気容量変化を測定(C−V測定)すると、BTS処理前後でフラットバンド電圧VFBの位置がシフトする。よって、絶縁膜中あるいは界面に不純物イオンが含まれない場合、BTS処理によるフラットバンド電圧の変化量(ΔVFB)から、絶縁膜中のCuイオンの拡散しやすさを見積もることができる。   On the other hand, the ballistic property was evaluated as follows. That is, the diffusion of metal ions into the insulating film is generally accelerated when a voltage is applied under heating at about 100 to 300 ° C. (hereinafter referred to as “BTS treatment”). For this reason, when the change in the capacitance with respect to the bias voltage is measured (CV measurement), the position of the flat band voltage VFB is shifted before and after the BTS processing. Therefore, when impurity ions are not included in the insulating film or at the interface, the ease of diffusion of Cu ions in the insulating film can be estimated from the amount of change in flat band voltage (ΔVFB) due to the BTS treatment.

具体的には、上記のようにバリア膜及びCu膜からなる積層膜を形成した基板を電気測定用加熱ステージに取付け、窒素雰囲気中で、200℃で12時間加熱し、吸着水を十分に除去した後、室温まで放冷し、そして、窒素雰囲気でC−V測定を行い、再び200℃まで昇温し(昇温速度7℃/min)、BTS処理した。C−V測定条件は、測定間隔1V、測定時間1秒、周波数1MHz、測定範囲−40V〜+40Vとした。他方、BTS処理条件は、加熱温度200℃、バイアス電圧+20V、1時間保持した。室温まで放冷(降温速度7℃/min)した後、再びC−V測定を行い、フラットバンド電圧のシフト量ΔVFBを算出し、このΔVFBがマイナス側にシフトしたものをバリア性不可と評価した。   Specifically, the substrate on which the laminated film composed of the barrier film and the Cu film as described above is attached to the heating stage for electrical measurement, and heated at 200 ° C. for 12 hours in a nitrogen atmosphere to sufficiently remove the adsorbed water. Then, it was allowed to cool to room temperature, CV measurement was performed in a nitrogen atmosphere, the temperature was raised again to 200 ° C. (temperature raising rate 7 ° C./min), and BTS treatment was performed. The CV measurement conditions were a measurement interval of 1 V, a measurement time of 1 second, a frequency of 1 MHz, and a measurement range of −40V to + 40V. On the other hand, the BTS treatment conditions were maintained at a heating temperature of 200 ° C. and a bias voltage of +20 V for 1 hour. After allowing to cool to room temperature (temperature decrease rate 7 ° C./min), CV measurement was performed again to calculate the flat band voltage shift amount ΔVFB, and this ΔVFB shifted to the negative side was evaluated as having no barrier property. .

これによれば、Tiの組成比が5原子%以上の場合には、絶縁膜へのCuの拡散を防止するのに必要なバリア性を有していることが判る。然し、Tiの組成比が35原子%以上になると、テープテストにより殆どの膜が粘着テープに付着して剥がれ、十分な密着性が得られなかった。   According to this, it can be seen that when the composition ratio of Ti is 5 atomic% or more, it has a barrier property necessary to prevent the diffusion of Cu into the insulating film. However, when the composition ratio of Ti was 35 atomic% or more, most of the film adhered to the adhesive tape and peeled off by the tape test, and sufficient adhesion was not obtained.

本発明の薄膜形成方法を実施する際にバリアメタル膜を形成するのに適したスパッタリング装置の模式的構成図。The typical block diagram of the sputtering device suitable for forming a barrier metal film, when implementing the thin film formation method of this invention. (a)及び(b)は、図1に示すスパッタリング装置に用いるターゲットの説明図。(A) And (b) is explanatory drawing of the target used for the sputtering device shown in FIG. 実施例1で得られた薄膜の密着性及びバリア性を評価した表。The table | surface which evaluated the adhesiveness and barrier property of the thin film obtained in Example 1. FIG.

符号の説明Explanation of symbols

1 スパッタリング装置(PVD)
2 スパッタ室
3 ガス導入手段
4 ターゲット
41 Tiターゲット
42 Ruターゲット
5 磁石組立体
1 Sputtering equipment (PVD)
2 Sputtering chamber 3 Gas introduction means 4 Target 41 Ti target 42 Ru target 5 Magnet assembly

Claims (2)

被処理物表面にPVD法によりバリアメタル膜を形成する工程と、このバリアメタル膜表面にCVD法によりCu膜を形成する工程と、前記バリア膜及びCu膜を積層したものを所定温度で熱処理する工程とを含み、
前記バリアメタル膜としてTi及びRuを含むものを用い、当該バリアメタル膜中のTiの組成比を5〜25原子%の範囲とすることを特徴とする薄膜形成方法。
A step of forming a barrier metal film on the surface of the object to be processed by the PVD method, a step of forming a Cu film on the surface of the barrier metal film by the CVD method, and a laminate of the barrier film and the Cu film are heat-treated at a predetermined temperature. Process,
A method for forming a thin film, wherein the barrier metal film contains Ti and Ru, and the composition ratio of Ti in the barrier metal film is in the range of 5 to 25 atomic%.
前記PVD法はスパッタリング法であり、ターゲットとして、所定形状を有するTi製のターゲットのスパッタ面中央領域に、所定形状を有するRu製のターゲットを配置したものを用い、プラズマの形状を調節して前記組成比のバリアメタル膜を得ることを特徴とする請求項1記載の薄膜形成方法。   The PVD method is a sputtering method, and a target in which a Ru target having a predetermined shape is arranged in a center area of a sputtering target of a Ti target having a predetermined shape, and the shape of the plasma is adjusted to adjust the plasma shape. 2. The thin film forming method according to claim 1, wherein a barrier metal film having a composition ratio is obtained.
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Citations (4)

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Publication number Priority date Publication date Assignee Title
JPS58199860A (en) * 1982-05-17 1983-11-21 Hitachi Ltd Film forming method
JP2000096243A (en) * 1998-09-24 2000-04-04 Anelva Corp Manufacture of thin metal copper film by cvd
JP2005513813A (en) * 2001-12-28 2005-05-12 ジェニテック カンパニー リミテッド Method for forming copper wiring for semiconductor integrated circuit on substrate
JP2006005190A (en) * 2004-06-18 2006-01-05 Renesas Technology Corp Semiconductor device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58199860A (en) * 1982-05-17 1983-11-21 Hitachi Ltd Film forming method
JP2000096243A (en) * 1998-09-24 2000-04-04 Anelva Corp Manufacture of thin metal copper film by cvd
JP2005513813A (en) * 2001-12-28 2005-05-12 ジェニテック カンパニー リミテッド Method for forming copper wiring for semiconductor integrated circuit on substrate
JP2006005190A (en) * 2004-06-18 2006-01-05 Renesas Technology Corp Semiconductor device

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