WO2012101850A1 - スパッタリングターゲット - Google Patents
スパッタリングターゲット Download PDFInfo
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- WO2012101850A1 WO2012101850A1 PCT/JP2011/067833 JP2011067833W WO2012101850A1 WO 2012101850 A1 WO2012101850 A1 WO 2012101850A1 JP 2011067833 W JP2011067833 W JP 2011067833W WO 2012101850 A1 WO2012101850 A1 WO 2012101850A1
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- Prior art keywords
- target
- angle
- sputtering
- inclined surface
- thickness
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
- C23C14/3407—Cathode assembly for sputtering apparatus, e.g. Target
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
- C23C14/3464—Sputtering using more than one target
Definitions
- the present invention relates to a sputtering target used when forming a thin film by a sputtering method, wherein the target has high use efficiency and good film uniformity (thickness uniformity) throughout the sputtering life. provide.
- the method of forming a thin film by sputtering is widely used in the production of various electronic and electrical parts.
- a substrate serving as an anode and a target serving as a cathode are opposed to each other, and an electric field is generated by applying a high voltage between these substrate and target in an inert gas atmosphere.
- Electrons and inert gas collide to form a plasma.
- the cations in the plasma collide with the target surface and strike target atoms, and the ejected atoms adhere to the opposing substrate surface to form a film. This is based on the principle that
- Magnetron sputtering is a method in which a magnet is set on the back side of a target and a magnetic field is generated in the direction perpendicular to the electric field on the target surface to perform sputtering. In such an orthogonal electromagnetic field space, plasma stabilization and densification are achieved. It is possible to increase the sputtering rate.
- magnetron sputtering captures electrons in a magnetic field and efficiently ionizes the sputtering gas.
- target material target shape, type of sputtering equipment, etc.
- erosion of the target is different, and uniform erosion is not achieved. This applies not only to the magnetron sputtering method but also to other sputtering methods.
- the target reaches the end of its life when the deepest erosion is reached and is replaced with a new target.
- the target is formed in a flat plate shape or a cylindrical shape.
- film uniformity thickness uniformity
- the target may reach the end of its life despite its remaining thickness. This is a case where a management value such as a film uniformity (film thickness uniformity) and a process loss rate determined in the film forming process exceeds a certain set allowable value during the target life. In such a case, if the same target is continuously used, the allowable value is exceeded. Therefore, even if the target has a remaining thickness, it is replaced with a new target. That is, the lifetime of the target is shorter than the original.
- Patent Document 1 proposes a target that is a rectangular parallelepiped multi-divided target and has an inclined surface from a target surface having a high height to a surface having a low height when there is a height difference in the divided target that receives erosion. ing.
- the thickness of the divided target material having a small thickness is substantially equal to the adjacent part of the thicker divided target material.
- a horizontal portion having the same thickness is formed, and the width of the horizontal portion is 1 mm or more, and the upper part of the thicker divided target material is disposed above the thicker divided target material.
- a sputtering target in which an inclined portion continuous with the target surface is formed, and an angle formed between the inclined portion and the horizontal portion of the thicker divided target material is 30 ° or more and 45 ° or less.
- the end target material is provided with an inclination toward the center.
- an inclination there may be a problem in the uniformity of the film when the film is formed by sputtering. Specifically, a phenomenon was observed in which the film thickness distribution in the substrate surface deteriorated compared to the case where the film was formed using a target material having no inclination.
- the target material ITO Indium Tin Oxide
- the present invention has been made in view of the above problems or drawbacks, and is a sputtering target used when forming a thin film by a sputtering method, and even if the target material has an inclined portion,
- the object of the present invention is to propose a target material having a shape that does not deteriorate the uniformity, and to provide a target with high target use efficiency and good film uniformity (film thickness uniformity) throughout the sputtering life.
- the present inventor made a sputtering target shape and a target shape that anticipates erosion, and sputtered by using the target, so that the film uniformity (thickness uniformity) was achieved throughout the sputtering life. ), The generation of particles is small, and the life of the target can be extended.
- the “high use efficiency target” used in the present specification means a target having a shape assuming erosion.
- the sputter surfaces of the target portions at both ends are inclined with an inclined surface of angle ⁇ inclined downward from the maximum thickness portion toward the center of the target and an inclined surface of angle ⁇ facing the inclined surface of angle ⁇ .
- a sputtering target is provided.
- the present invention also provides: 2) The sputtering target according to 1) above, wherein the angle ⁇ is 0.3 to 45 °. 3) The angle ⁇ is 30 to 80% of the angle ⁇ .
- the sputtering target according to any one of 1) to 3) above is provided.
- the present invention also provides: 5) The sputtering target according to any one of 1) to 3) above, wherein a flat surface P is provided between the inclined surface having the angle ⁇ and the inclined surface having the angle ⁇ .
- the sputtering target according to 5) above, wherein the thickness L3 of the flat surface P is the angle L1 and the angle L1 of the inclined surface The sputtering target according to 6) above, which is shorter than the length L2 of the inclined surface of ⁇ .
- the present invention also provides: 9) The sputtering target 10) according to any one of the above 1) to 8), wherein the target is a split target, and the target portions at both ends have an inclined surface with an angle ⁇ and an inclined surface with an angle ⁇ .
- FIG. 4 is a plan view (partial), a CC cross-sectional view, an AA cross-sectional view, and a BB cross-sectional view of a target of an example (without a flat surface P).
- FIG. 4 is a plan view (partial), a CC sectional view, an AA sectional view, and a BB sectional view of a target of an example (with a flat surface P).
- FIG. 6 is a plan view (partial), a CC sectional view, an AA sectional view, and a BB sectional view of a target of a comparative example.
- the overall shape of the sputtering target of the present invention is a rectangular (rectangular) target in plan view.
- the target portion at the center of this target has a flat sputter surface.
- the outermost part is flat for the convenience of production and handling of the target, but the subsequent part is an inclined sputtering surface.
- FIGS. 1 and 2 to be described later the whole is a rectangular sputtering target as viewed in a plan view.
- the maximum thickness of the target portions at both ends is larger than the thickness of the central target portion, and the sputtering surfaces of the target portions at both ends are inclined downward from the maximum thickness portion toward the target center.
- An inclined surface 4 having an angle ⁇ and an inclined surface 5 having an angle ⁇ facing the inclined surface having the angle ⁇ are formed.
- the target of the present invention is usually used as a target for magnetron sputtering.
- magnetron sputtering in order to increase the sputtering efficiency, a magnet disposed on the back surface of the target is disposed.
- a portion that receives strong erosion and a portion that does not receive erosion are generated depending on the placement of the magnet or the strength of the lines of magnetic force.
- the target of the present invention needs to have a structure that can cope with this, can perform stable sputtering, and can make the uniformity of the film more uniform.
- the target is made to have a thick portion where the erosion is caused by sputtering, and the inclined surface as described above is produced in order to make the uniformity of the film more uniform.
- the particles sputtered out from the inclined surface 4 formed on the erosion surface of the target by the inclination angle ⁇ are more concentrated in the central portion in the longitudinal direction of the target.
- the film thickness of the film formed on the substrate in that region is thicker than other regions, and conversely at a position facing the inclined surface 4 (a position immediately above the target inclined surface described later).
- the film thickness becomes thinner.
- a thin film and a thick film are formed, the film thickness becomes non-uniform, and the uniformity deteriorates.
- a new inclined surface 5 having an angle ⁇ is formed so as to face the inclined surface 4. For this reason, the particles knocked out from the inclined surface 5 formed at the angle ⁇ reach the position facing the inclined surface 4, so that the portion where the film thickness is reduced in the comparative example is compensated, and the in-plane surface of the substrate is compensated. Overall, a film with good uniformity can be obtained.
- the inclined surface 4 having the angle ⁇ and the inclined surface 5 having the angle ⁇ are joined in a straight line, but the inclined surface 5 having the angle ⁇ is a starting point where the level of the flat surface of the central target portion is high or low. Therefore, the target thickness at the straight joining position is thinner than the thickness of the central target portion.
- the angle ⁇ is preferably 0.3 to 45 °. If the angle ⁇ exceeds 45 °, the uniformity of uniformity is not improved so much even if the angle ⁇ is formed.
- the angle ⁇ is preferably in the range of 30 to 80% of the angle ⁇ . That is, ⁇ ⁇ 0.3 ⁇ ⁇ ⁇ 0.8. When the angle ⁇ is less than 30% of ⁇ , it becomes difficult to sufficiently compensate for the thinned portion. When the angle ⁇ exceeds 80%, the film thickness at the intermediate portion between the inclined surface 4 and the inclined surface 5 becomes thin. Tend.
- a flat surface P can also be provided between the inclined surface 4 with the inclination angle ⁇ and the inclined surface 5 with the inclination angle ⁇ of the sputtering target, as shown in FIG.
- the inclined surface 5 having the angle ⁇ is a starting point where the level of the flat surface of the central target portion is high and low, and therefore the thickness of the flat surface P connected thereto is larger than the thickness of the central target portion. getting thin.
- the length L3 of the flat surface P is shorter than the length of the inclined surface L1 having the angle ⁇ and the length of the inclined surface L2 having the angle ⁇ in order to maintain uniformity of uniformity in the sputtering target of the present invention.
- This is a preferable condition.
- the total length of L1, L2, and L3 is preferably 25% or less of the total length of the rectangular target. However, this condition is a suitable condition, and other conditions can be selected.
- Sputtering targets can be all integrated targets, but can also be divided targets. In the case of a split target, several forms are possible, but only the target portions at both ends are made into an integrated target (an undivided target) having an inclined surface with an angle ⁇ and an inclined surface with an angle ⁇ , Others can be appropriately divided targets. This form is an example of a typical sputtering target.
- the target part at both ends having a flat part the target part having the inclined surface 4 with the angle ⁇ , the target part having the inclined surface 5 with the angle ⁇ , and the inclined surface 4 with the angle ⁇ and the inclined surface 5 with the angle ⁇
- One or a plurality of target portions having a flat surface P and a central target portion having a flat sputter surface may be used as a divided target.
- the sputtering target of the present invention can be applied to indium, tin, aluminum, copper, tantalum, titanium, nickel, cobalt, ruthenium, tungsten, rhodium, or alloys or oxides thereof.
- a target for a display material such as ITO (oxide of indium and tin).
- the erosion profile target of the present invention In manufacturing the erosion profile target of the present invention, a flat target is sputtered in advance, and the erosion shape and depth at that time are examined, and based on this, the thickness of the target can be adjusted. As a result, even if there is a difference in erosion that varies depending on the type of target material, a highly efficient target can be easily manufactured according to the specific target erosion.
- the target of the present invention is easy to manufacture and has the advantage that the life of the target can be extended.
- the film uniformity film thickness uniformity
- the film uniformity can be improved through the initial stage of sputtering and the life of sputtering, and there is an excellent effect that the generation of particles is small.
- a high use efficiency target can be easily produced according to the specific target erosion.
- FIG. 1 shows a plan view (partial), a CC sectional view, an AA sectional view, and a BB sectional view of the target backing plate assembly.
- the backing plate of the target backing plate assembly of the first embodiment is rectangular (rectangular) in plan view. In this case, a split target is used.
- Examples and comparative examples Eight ITO targets having a size of 200 ⁇ 2300 mm were arranged facing a 1500 ⁇ 1850 mm size substrate, and film formation was performed with a target thickness of 40 nm.
- the substrate is formed so as to be stationaryly opposed to the target.
- the target of the present invention is also effective in a system in which the substrate passes over the target. After film formation, the level difference between the part with no film on the substrate and the part with the film was measured with a stylus type step meter, and the film thickness uniformity was evaluated from the distribution of the level difference at nine points in the substrate surface. The results are shown in Table 1.
- Comparative Example 1 In Comparative Example 1, the angle ⁇ of the inclined surface 4 is 0.76 °, and the inclined surface 5 having the angle ⁇ is not provided. However, the film thickness uniformity of the entire substrate surface is ⁇ 12%, which is not good. became.
- Comparative Example 2 In Comparative Example 2, the angle ⁇ of the inclined surface 4 is 2.29 ° and the inclined surface 5 having the angle ⁇ is not provided. However, the film thickness uniformity of the entire substrate surface is ⁇ 15%, which is not good. became.
- Comparative Example 3 In Comparative Example 3, the inclined surface 4 has an inclined surface 5 having an angle ⁇ of 0.76 ° and an angle ⁇ of 0.19 ° (0.25 ⁇ ). The ratio of the angle ⁇ and the angle ⁇ deviates from the lower limit value which is a preferable condition of the present invention. As a result, the film thickness uniformity over the entire substrate surface was ⁇ 11%, which was defective.
- Comparative Example 4 In Comparative Example 4, the angle ⁇ of the inclined surface 4 is 0.76 °, and the inclined surface 5 has an angle ⁇ of 0.72 ° (0.94 ⁇ ). The ratio of the angle ⁇ to the angle ⁇ deviates from the upper limit value which is a preferable condition of the present invention. As a result, the film thickness uniformity over the entire substrate surface was ⁇ 10%, which was defective.
- the comparative example 5 has the inclined surface 5 in which the angle ⁇ of the inclined surface 4 is 2.29 ° and the angle ⁇ is 0.57 ° (0.25 ⁇ ).
- the ratio of the angle ⁇ and the angle ⁇ deviates from the lower limit value which is a preferable condition of the present invention.
- the film thickness uniformity over the entire substrate surface was ⁇ 13%, which was defective.
- the comparative example 6 has the inclined surface 5 in which the angle ⁇ of the inclined surface 4 is 2.29 ° and the angle ⁇ is 1.91 ° (0.83 ⁇ ).
- the ratio of the angle ⁇ to the angle ⁇ deviates from the upper limit value which is a preferable condition of the present invention.
- the film thickness uniformity over the entire substrate surface was ⁇ 14%, which was defective.
- Example 1 In contrast to the comparative example described above, in Example 1, the inclined surface 4 has an inclined surface 5 with an angle ⁇ of 0.76 ° and an angle ⁇ of 0.29 ° (0.38 ⁇ ). The ratio of the angle ⁇ to the angle ⁇ is within the preferable range of the present invention. As a result, the film thickness uniformity over the entire substrate surface was ⁇ 6%, which was a favorable result.
- Example 2 the inclined surface 4 has an inclined surface 5 with an angle ⁇ of 0.76 ° and an angle ⁇ of 0.57 ° (0.75 ⁇ ).
- the ratio of the angle ⁇ to the angle ⁇ is within the preferable range of the present invention.
- the film thickness uniformity over the entire substrate surface was ⁇ 4%, which was a favorable result.
- Example 3 In Example 3, the inclined surface 4 has an inclined surface 5 with an angle ⁇ of 2.29 ° and an angle ⁇ of 0.72 ° (0.31 ⁇ ). The ratio of the angle ⁇ to the angle ⁇ is within the preferable range of the present invention. As a result, the film thickness uniformity over the entire substrate surface was ⁇ 7%, which was a favorable result.
- Example 4 the inclined surface 4 has an inclined surface 5 with an angle ⁇ of 2.29 ° and an angle ⁇ of 1.43 ° (0.63 ⁇ ).
- the ratio of the angle ⁇ to the angle ⁇ is within the preferable range of the present invention.
- the film thickness uniformity over the entire substrate surface was ⁇ 6%, which was a favorable result.
- the film thickness uniformity of the entire substrate surface was ⁇ 10% or more under any condition.
- the film thickness uniformity of the entire substrate surface was less than ⁇ 10% under any condition, and good results were obtained.
- the sputtering target according to the prior art shown in FIG. 3 is manufactured by combining targets having different plate thicknesses depending on the erosion depth in order to obtain high use efficiency. At that time, a part of the sputtering surface is inclined. As a result, a problem may occur in the uniformity of the film.
- the target of the present invention As described above, a film with good uniformity can be obtained without impairing the characteristic of high use efficiency.
- the 10th generation line with a substrate size of 3m x 3m is in mass production in TFT-LCD. Although it is very difficult to uniformly form a thin film having a thickness of only about 40 nm on such an ultra-large substrate, the problem can be solved by using the target of the present invention.
- the present invention is effective particularly in the sixth generation line or more where the total length of the target exceeds 2 m.
- the target backing plate assembly of the present invention can extend the life of the target, improve film uniformity (thickness uniformity) throughout the sputtering life, and can also be used for the types of target materials. Even if there is a difference in erosion that varies depending on the target erosion, it has an effect that a target corresponding to a specific target erosion can be easily manufactured. Therefore, it is useful as a target backing plate assembly that can be used for various materials.
- Target 2 Flat part of target 3: Divided part of divided target 4: Inclined surface with angle ⁇ formed on erosion surface of target 5: Inclined surface with angle ⁇ formed on erosion surface of target 6: Flat backing plate
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Abstract
Description
さらに、ターゲットは厚さが残っているのにも関わらず、寿命を迎える事がある。これは、ターゲットライフの途中で、成膜プロセスの中で定められた膜のユニフォーミティ(膜厚の均一性)や工程ロス率といった管理値が、ある設定許容値を超えるような場合である。こうした時は、同じターゲットを継続して使用すると、許容値を超えてしまうため、ターゲットに残り厚があっても、新規なターゲットと交換される。つまり、ターゲットの寿命は本来よりも短いものとなる。
その結果、この膜厚分布の悪化に伴って、膜の面積抵抗(シート抵抗)や透過率にも分布の悪化が生じ、ターゲット材をITO(Indium Tin Oxide)として透明導電膜を形成し、LCDやPDP等の表示デバイスを作製した場合等は、表示特性に不均一性が生じて、大型表示デバイスには不適であった。
1)中央のターゲット部位が平坦なスパッタ面を備え、両端のターゲット部位が傾斜したスパッタ面を備えている全体が矩形であるスパッタリングターゲットであって、前記両端のターゲット部位の最大厚みは中央のターゲット部位の厚みよりも大きく、該両端のターゲット部位のスパッタ面は最大厚み部からターゲット中央に向かって下方向に傾斜した角度αの傾斜面と該角度αの傾斜面に向かい合う角度βの傾斜面を備えていることを特徴とするスパッタリングターゲット、を提供する。
2)前記角度αは、0.3~45°であることを特徴とする上記1)記載のスパッタリングターゲット
3)前記角度βは、前記角度αの30~80%であることを特徴とする上記1)又は2)記載のスパッタリングターゲット
4)前記角度αの傾斜面と角度βの傾斜面は、直線で接合し、その接合位置のターゲット厚みは、中央のターゲット部位の厚みよりも薄いことを特徴とする上記1)~3)のいずれか一項に記載のスパッタリングターゲット、を提供する。
5)前記角度αの傾斜面と角度βの傾斜面との間に、平坦面Pを有することを特徴とする上記1)~3)のいずれか一項に記載のスパッタリングターゲット
6)平坦面Pのターゲットの厚みは、前記中央のターゲット部位の厚みよりも薄いことを特徴とする上記5)記載のスパッタリングターゲット
7)平坦面Pの長さL3が、角度αの傾斜面の長さL1及び角度βの傾斜面の長さL2よりも短いことを特徴とする上記6)記載のスパッタリングターゲット、を提供する。
8)前記L1とL2とL3の合計長さは、矩形ターゲットの全長の25%以下であることを特徴とする上記7)記載のスパッタリングターゲット、を提供する。
9)ターゲットが分割ターゲットであることを特徴とする上記1)~8)のいずれか一項に記載のスパッタリングターゲット
10)両端のターゲット部位が、角度αの傾斜面と角度βの傾斜面を有する一体のターゲットであることを特徴とする上記1)~9)のいずれか一項に記載のスパッタリングターゲット
11)平坦部を持つ両端のターゲット部位、角度αの傾斜面を持つターゲット部位、角度βの傾斜面を持つターゲット部位、角度αの傾斜面と角度βの傾斜面との間に平坦面Pを有するターゲット部位、平坦なスパッタ面を備える中央のターゲット部位の、1又は複数個が分割ターゲットであることを特徴とする上記1)~10)のいずれか一項に記載のスパッタリングターゲット、
12)スパッタリング後の基板面内全体の膜厚ユニフォーミティが±10%未満の範囲内であることを特徴とする上記1)~11)のいずれか一項に記載のスパッタリングターゲット、を提供する。
これはスパッタリング装置に依存するが、本発明のターゲットは、これに対応でき、安定したスパッタリングができ、膜のユニフォーミティをより均一にすることができる構造を持つ必要がある。
しかし、このような場合であっても、ターゲットの全体の利用効率は常に高める必要が求められる。従来のスパッタリングターゲットではターゲットのエロージョンを強く受ける部位を厚くすることが提案されている。しかし、この場合は、ターゲットと基板間の距離が一定でないために、特にスパッタリング初期において、膜のユニフォーミティが安定しないという問題がある。
しかし、ターゲットのエロージョン面に形成された傾斜角度αの傾斜面4からスパッタで叩き出された粒子は、ターゲット長手方向の中央部により多く集中するようになる。
前記角度αの傾斜面4と角度βの傾斜面5は、直線で接合することになるが、角度βの傾斜面5は、中央のターゲット部位の平坦な面のレベルが高低の出発点となるので、直線の接合位置におけるターゲット厚みは、中央のターゲット部位の厚みよりも薄くなる。
これによって、ターゲットの材料の種類により変化するというエロージョンの相違があっても、固有のターゲットエロージョンに応じて高使用効率ターゲットを容易に製造することができる。
ターゲットにはITO(インジウム錫酸化物)を用いた。図1には、ターゲットバッキングプレート組立体の平面図(一部)、C-C断面図、A-A断面図、B-B断面図を示す。この図1に示すように、実施例1のターゲットバッキングプレート組立体のバッキングプレートは、平面的にみて矩形(長方形)である。
この場合、分割ターゲットを使用している。
1500×1850mmサイズの基板に対向して、200×2300mmサイズのITOターゲットを8本配列させ、膜厚40nmを目標として成膜を行った。
本実施例では、基板はターゲットに静止対向して成膜する例を示したが、本発明のターゲットは、基板がターゲット上を通過して成膜される方式においても有効である。
成膜後、基板上の膜の付いていない部分と付いている部分の段差を触針式段差計で測定し、基板面内9点の段差の分布から、膜厚ユニフォーミティを評価した。この結果を、表1に示す。
比較例1は、傾斜面4の角度αが0.76°であり、角度βの傾斜面5を有しないものであるが、基板面内全体の膜厚ユニフォーミティが±12%となり、不良となった。
比較例2は、傾斜面4の角度αが2.29°であり、角度βの傾斜面5を有しないものであるが、基板面内全体の膜厚ユニフォーミティが±15%となり、不良となった。
比較例3は、傾斜面4の角度αが0.76°であり、角度βが0.19°(0.25α)の傾斜面5を持つものである。この角度βと角度αの比は、本願発明の好ましい条件である下限値から逸脱している。この結果、基板面内全体の膜厚ユニフォーミティが±11%となり、不良となった。
比較例4は、傾斜面4の角度αが0.76°であり、角度βが0.72°(0.94α)の傾斜面5を持つものである。この角度βと角度αの比は、本願発明の好ましい条件である上限値から逸脱している。この結果、基板面内全体の膜厚ユニフォーミティが±10%となり、不良となった。
比較例5は、傾斜面4の角度αが2.29°であり、角度βが0.57°(0.25α)の傾斜面5を持つものである。この角度βと角度αの比は、本願発明の好ましい条件である下限値から逸脱している。この結果、基板面内全体の膜厚ユニフォーミティが±13%となり、不良となった。
比較例6は、傾斜面4の角度αが2.29°であり、角度βが1.91°(0.83α)の傾斜面5を持つものである。この角度βと角度αの比は、本願発明の好ましい条件である上限値から逸脱している。この結果、基板面内全体の膜厚ユニフォーミティが±14%となり、不良となった。
以上の比較例に対して、実施例1では、傾斜面4の角度αが0.76°であり、角度βが0.29°(0.38α)の傾斜面5を持つものである。この角度βと角度αの比は、本願発明の好ましい条件の範囲にある。この結果、基板面内全体の膜厚ユニフォーミティが±6%となり、良好な結果となった。
実施例2では、傾斜面4の角度αが0.76°であり、角度βが0.57°(0.75α)の傾斜面5を持つものである。この角度βと角度αの比は、本願発明の好ましい条件の範囲にある。この結果、基板面内全体の膜厚ユニフォーミティが±4%となり、良好な結果となった。
実施例3では、傾斜面4の角度αが2.29°であり、角度βが0.72°(0.31α)の傾斜面5を持つものである。この角度βと角度αの比は、本願発明の好ましい条件の範囲にある。この結果、基板面内全体の膜厚ユニフォーミティが±7%となり、良好な結果となった。
実施例4では、傾斜面4の角度αが2.29°であり、角度βが1.43°(0.63α)の傾斜面5を持つものである。この角度βと角度αの比は、本願発明の好ましい条件の範囲にある。この結果、基板面内全体の膜厚ユニフォーミティが±6%となり、良好な結果となった。
これに対し、実施例では、いずれの条件でも、基板面内全体の膜厚ユニフォーミティが±10%未満であり、良好な結果となった。
現在、TFT-LCDでは基板サイズが3m×3mに近い第10世代ラインが量産稼動している。このような超大型の基板に対して、わずか40nm程度の薄膜を均一に形成するのは非常に難しいが、本願発明のターゲットを使用する事により、その問題の解決を図ることができる。本願発明は、特にターゲットの全長が2mを超える第6世代ライン以上で、有効である。
2: ターゲットの平坦部
3: 分割ターゲットの分割部
4: ターゲットのエロージョン面に形成された角度αをもつ傾斜面
5: ターゲットのエロージョン面に形成された角度βをもつ傾斜面
6: 平板状バッキングプレート
Claims (12)
- 中央のターゲット部位が平坦なスパッタ面を備え、両端のターゲット部位が傾斜したスパッタ面を備えている全体が矩形であるスパッタリングターゲットであって、前記両端のターゲット部位の最大厚みは中央のターゲット部位の厚みよりも大きく、該両端のターゲット部位のスパッタ面は最大厚み部からターゲット中央に向かって下方向に傾斜した角度αの傾斜面と該角度αの傾斜面に向かい合う角度βの傾斜面を備えていることを特徴とするスパッタリングターゲット。
- 前記角度αは、0.3~45°であることを特徴とする請求項1記載のスパッタリングターゲット。
- 前記角度βは、前記角度αの30~80%であることを特徴とする請求項1又は2記載のスパッタリングターゲット。
- 前記角度αの傾斜面と角度βの傾斜面は、直線で接合し、その接合位置のターゲット厚みは、中央のターゲット部位の厚みよりも薄いことを特徴とする請求項1~3のいずれか一項に記載のスパッタリングターゲット。
- 前記角度αの傾斜面と角度βの傾斜面との間に、平坦面Pを有することを特徴とする請求項1~3のいずれか一項に記載のスパッタリングターゲット。
- 平坦面Pのターゲットの厚みは、前記中央のターゲット部位の厚みよりも薄いことを特徴とする請求項5記載のスパッタリングターゲット。
- 平坦面Pの長さL3が、角度αの傾斜面の長さL1及び角度βの傾斜面の長さL2よりも短いことを特徴とする請求項6記載のスパッタリングターゲット。
- 前記L1とL2とL3の合計長さは、矩形ターゲットの全長の25%以下であることを特徴とする請求項7記載のスパッタリングターゲット。
- ターゲットが分割ターゲットであることを特徴とする請求項1~8のいずれか一項に記載のスパッタリングターゲット。
- 両端のターゲット部位が、角度αの傾斜面と角度βの傾斜面を有する一体のターゲットであることを特徴とする請求項1~9のいずれか一項に記載のスパッタリングターゲット。
- 平坦部を持つ両端のターゲット部位、角度αの傾斜面を持つターゲット部位、角度βの傾斜面を持つターゲット部位、角度αの傾斜面と角度βの傾斜面との間に平坦面Pを有するターゲット部位、平坦なスパッタ面を備える中央のターゲット部位の、1又は複数個が分割ターゲットであることを特徴とする請求項1~10のいずれか一項に記載のスパッタリングターゲット。
- スパッタリング後の基板面内全体の膜厚ユニフォーミティが±10%未満の範囲内であることを特徴とする請求項1~11のいずれか一項に記載のスパッタリングターゲット。
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CN103820759A (zh) * | 2013-08-27 | 2014-05-28 | 中国建材国际工程集团有限公司 | 一种提高矩形平面磁控溅射阴极靶材利用率的方法 |
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