JP4943780B2 - Plasma processing apparatus and plasma processing method - Google Patents
Plasma processing apparatus and plasma processing method Download PDFInfo
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Description
本発明は、プラズマ処理装置およびプラズマ処理方法に係り、特に高周波電力を印加して減圧下で着火したプラズマを用いて被処理物を処理するのに好適なプラズマ処理装置およびプラズマ処理方法に関する。 The present invention relates to a plasma processing apparatus and a plasma processing method, and more particularly to a plasma processing apparatus and a plasma processing method suitable for processing an object to be processed using plasma ignited under reduced pressure by applying high-frequency power.
従来、プラズマ処理装置における異物発生の要因として、(1)ガス起因のパーティクル、(2)ESC起因のパーティクル、(3)RF起因のパーティクル、(4)熱起因のパーティクル等があることが知られている。一般に、ESC起因のパーティクルに対しては、プラズマ着火後にESC電圧を印加することによりパーティクルを低減できることが知られている。 Conventionally, it is known that there are (1) particles caused by gas, (2) particles caused by ESC, (3) particles caused by RF, (4) particles caused by heat, and the like as factors of foreign matter generation in a plasma processing apparatus. ing. In general, it is known that for particles caused by ESC, the particles can be reduced by applying an ESC voltage after plasma ignition.
また、RF起因のパーティクルに対しては、最初に最小限プラズマの着火に必要な最小限の電力をガスに供給し最小限プラズマを生成し、その後電力を増加して被処理基板の処理に必要なプラズマを生成することにより、プラズマ着火時におけるパーティクルの発生自体を抑制し、発生したとしても被処理基板への付着を防止してパーティクルを低減できることが知られている(例えば、特許文献1参照)。
従来の異物低減技術は、プラズマ着火時におけるプラズマ着火遅れに伴う異物の発生、付着に関して考慮されていない。すなわち、電力(高周波電力)投入からプラズマ着火までの間にも異物が発生し、プラズマ着火後にも影響していることが発明者らの実験によって明らかになった。図1は電力投入からプラズマの発生までの異物と時間との関係を示した概念図であり、図2はプラズマが着火しない条件で電力のみを投入し、異物数を計測した結果である。 In the conventional foreign matter reduction technology, no consideration is given to the generation and adhesion of foreign matters accompanying plasma ignition delay during plasma ignition. That is, it has been clarified by experiments by the inventors that foreign matters are generated between the time when electric power (high-frequency power) is turned on and the plasma is ignited, and the influence is exerted after the plasma is ignited. FIG. 1 is a conceptual diagram showing the relationship between foreign matter and time from power-on to plasma generation, and FIG. 2 shows the result of measuring the number of foreign matters when only power is turned on under the condition that plasma does not ignite.
図2に示すようにプラズマの着火を伴わない電力投入だけでも異物が発生し、電力値が大きくなるに従い異物の量も多くなっている。この異物発生の機構については不明であるが、熱応力や静電応力、マックスウェル応力等が処理室内壁に働き、処理室内壁に付着していた異物が剥離等により発生したことが考えられる。 As shown in FIG. 2, foreign matter is generated only by turning on power without plasma ignition, and the amount of foreign matter increases as the power value increases. Although the mechanism of the generation of foreign matter is unknown, it is considered that thermal stress, electrostatic stress, Maxwell stress, etc. acted on the processing chamber inner wall and the foreign material adhering to the processing chamber inner wall was generated by peeling or the like.
図1に示すように電力投入により発生した異物は、発生場所からある初速を持って飛散、浮遊した後、基板に到達し、その一部が基板に付着する。高電力を投入すると異物の発生数が多いため、基板に付着する異物数も多くなるが、異物の剥離から基板へ到達するまでの間には異物の付着はない。電力投入からプラズマ着火までに時間がかかると、電力投入により処理室内壁面から剥離した異物が処理室空間に放出され被処理基板に付着してしまうという問題が生じる。 As shown in FIG. 1, the foreign matter generated by turning on the electric power is scattered and floated at a certain initial speed from the place of occurrence, and then reaches the substrate, and a part thereof adheres to the substrate. When high power is applied, the number of foreign matters generated is large, so the number of foreign matters attached to the substrate also increases. However, no foreign matter adheres between the separation of the foreign matter and the arrival at the substrate. When it takes a long time from turning on the power to igniting the plasma, there arises a problem that the foreign matter peeled off from the wall surface of the processing chamber due to turning on the power is released into the processing chamber space and adheres to the substrate to be processed.
本発明の目的は、プラズマ着火までに生じる被処理基板への異物の付着を抑制し異物の低減を図ることのできるプラズマ処理装置及びプラズマ処理方法を提供することにある。 An object of the present invention is to provide a plasma processing apparatus and a plasma processing method capable of suppressing the adhesion of foreign matter to a substrate to be processed that occurs until plasma ignition and reducing the foreign matter.
上記目的は、処理室内のガスに高周波電力を投入してプラズマを着火し、該プラズマを用いて被処理基板を処理するものにおいて、ガスへの高周波電力投入からプラズマが着火するまでの時間を、異物が被処理基板に到達するまでの時間内にすることにより達成される。 The above object is to ignite plasma by applying high-frequency power to the gas in the processing chamber, and to process the substrate to be processed using the plasma, in the time from the high-frequency power input to the gas until the plasma ignites, This is achieved by setting the time until the foreign material reaches the substrate to be processed.
また、上記目的は、プラズマの着火と異物が被処理基板に到達する時刻が同程度の場合には、プラズマの着火時に被処理基板にバイアス電位を与えることにより、より確実に達成される。 Further, the above object can be achieved more reliably by applying a bias potential to the substrate to be processed when the plasma is ignited when the time of plasma ignition and the time when the foreign matter reaches the substrate to be processed is approximately the same.
本発明によれば、高周波電力が投入されて処理室内に異物が放出されても、異物が被処理基板に到達するまでにプラズマが着火するため、処理室空間に放出された異物はシースの作用によって処理室空間に閉じ込められ被処理基板に到達することがないので、被処理基板への異物の付着を抑制でき、異物の低減を図ることができる。 According to the present invention, even if foreign matter is released into the processing chamber by applying high-frequency power, the plasma is ignited before the foreign matter reaches the substrate to be processed. Thus, the substrate is confined in the processing chamber space and does not reach the substrate to be processed, so that the adhesion of foreign matter to the substrate to be processed can be suppressed, and foreign matter can be reduced.
また、被処理基板にバイアス電位を与えることで被処理基板上に形成されるシースを厚くすることができ、被処理基板への異物の付着をより確実に抑制できる。 Further, by applying a bias potential to the substrate to be processed, the sheath formed on the substrate to be processed can be thickened, and adhesion of foreign matters to the substrate to be processed can be more reliably suppressed.
本発明は、図1に示したように異物が被処理基板に到達するまでの時間(この場合、たとえば0.9sec(処理室内圧力:0.1〜10Pa))以内にプラズマを着火する。これにより、高周波電力値が大きい場合(異物量が多い場合)でも小さい場合(異物量が少ない場合)でも関係なく、異物は被処理基板に到達することなくプラズマのシースの作用によって処理室内の空間に閉じ込められ、被処理基板への異物の付着を抑制することができる。 In the present invention, as shown in FIG. 1, the plasma is ignited within a time until the foreign substance reaches the substrate to be processed (in this case, for example, 0.9 sec (pressure in the processing chamber: 0.1 to 10 Pa)). Accordingly, regardless of whether the high-frequency power value is large (when the amount of foreign matter is large) or small (when the amount of foreign matter is small), the foreign matter does not reach the substrate to be processed, and the space in the processing chamber is caused by the action of the plasma sheath. It is possible to suppress the adhesion of foreign matter to the substrate to be processed.
本発明のプラズマ処理装置の第1の実施例を、図3ないし図6により説明する。図3は、実施例1に係るプラズマ処理装置の概略構成を示す縦断面図である。図3の装置において、1は処理室であり、この場合、図示を省略した真空排気系が接続されている。処理室1内の下部には被処理基板5が配置される基板電極2が設けられている。基板電極2には整合器3を介して高周波バイアス電源4が接続されている。また、処理室1内の基板電極2に対向して高周波導入窓およびシャワープレート6及び電極7が設けられている。高周波導入窓およびシャワープレート6には、図示を省略したガス供給系が接続され、処理室に処理ガスをシャワー状に供給する。アンテナ7には整合器8を介して高周波電源9が接続されている。
A first embodiment of the plasma processing apparatus of the present invention will be described with reference to FIGS. FIG. 3 is a longitudinal sectional view illustrating a schematic configuration of the plasma processing apparatus according to the first embodiment. In the apparatus of FIG. 3,
整合器8および高周波電源9にはこの場合、プラズマの着火を容易にして着火時間を短くするための制御装置10が接続されている。制御装置10は高周波電源9からアンテナ7を介して処理室1内に電力を投入した際の反射電力を小さくするための整合器8を初期設定することが可能である。
In this case, a
図4(a)に示すように、処理室内に所定のガスを所定の流量供給し真空排気系の排気速度を制御して所定の圧力に調整した後、高周波電源9を時刻ゼロにてオンし第1レベルの入射電力を投入する(図5のステップ101)。これにより反射電力が生じるが、図4(b)に示すように整合器の整合素子位置を自動整合させることにより反射電力を抑え(図5のステップ102)、反射電力が安定した時点でさらに高周波電力を上げ処理時の所定の電力量にする(図5のステップ103)。整合器8はさらに自動整合され所定の入射電力での反射電力が最小となる最適な整合値を得る(図5のステップ104)。これにより、処理室1内に効率良く電力が投入され処理室1内のガスがプラズマ化される(時刻Tb)。
As shown in FIG. 4 (a), a predetermined gas is supplied into the processing chamber at a predetermined flow rate, the exhaust speed of the vacuum exhaust system is controlled and adjusted to a predetermined pressure, and then the high
このとき、制御装置10は、図4におけるプラズマ着火(時刻Tb)前の時刻Taにおける整合器8の設定値、この場合、VC1,VC2,VC3の値を制御装置10に記憶する(図5のステップ105)。(時刻Tb−時刻Ta)は、図1に示す電力を投入してから異物が基板に到達するまでの時間内に設定される。好ましくは、プラズマが着火されてからプラズマが安定するのに要する時間(Tx)を考慮し、(時刻Tb−時刻Ta+時間Tx)が、異物が基板に到達するまでの時間内に設定されることが望ましい。制御装置10による整合器8の設定値の記憶は、被処理基板の処理条件が変更される毎に行われ、処理の種類毎に最適な設定値を記憶する。被処理基板の処理を実行する際には、制御装置10は、予め記憶した設定値によって整合器8を設定する(図5のステップ106)。これにより、高周波電源9からの出力を処理時の所定電力値で出力しても整合が容易であり、整合のための時間を短縮することができる。
At this time, the
これにより、電力投入からプラズマ着火までの時間を短縮することができ、電力投入により処理室内壁面から剥離された異物が処理室内に放出され基板に到達するまでに処理室内にプラズマを着火できる。これにより、処理室内に放出された異物はプラズマシースの作用によってプラズマ内に閉じ込められ、基板に到達して付着することがない。 Thereby, the time from power-on to plasma ignition can be shortened, and the plasma can be ignited before the foreign matter separated from the wall surface of the process chamber is released into the process chamber and reaches the substrate. Accordingly, the foreign matter released into the processing chamber is confined in the plasma by the action of the plasma sheath, and does not reach the substrate and adhere to it.
上述の実施例では、制御装置10による整合器8の設定値の記憶は、被処理基板の処理条件が変更される毎に行ったが、部品の変更や交換等のハード変更を伴わない場合には、必ずしも毎回行う必要はなく、初回のみ行ってもよい。例えば処理室の圧力をプラズマ着火により適した圧力に変更した場合、プラズマ着火前の処理室のインピーダンスには影響がないため、高周波電力の投入からプラズマ着火直前までの入反射電力や整合器の整合素子の動作に違いはない。ただしプラズマ着火に最低限必要な投入電力が小さくなるため、図4に示すプラズマ着火時刻Tbが早まることになる。ガス種やガス種の混合比等を変更した場合も同様にプラズマ着火前の処理室のインピーダンスに影響を与えないため、プラズマ着火直前までの入反射電力や整合器の整合素子の動作に違いはなく、プラズマ着火性が変化することによりプラズマ着火時刻が変わる事になる。プラズマ着火時刻が変わることは、プラズマ着火時の整合器の整合素子位置が変化することにつながる。高周波電力の投入からプラズマ着火までの時間(着火遅れ時間)を短縮する必要性がそれほど高くない場合には、ハード変更を伴う場合のみ、制御装置10による整合器8の設定値の記憶を行えばよい。
In the above-described embodiment, the setting value of the matching
図6に、制御装置10による整合器8の設定値の記憶を行うことで着火遅れ時間を短縮した場合(初期設定あり)と、整合器8の設定値の最適化を行わない場合(初期設定無し)の両者で異物数を比較した結果を示す。異物数の評価は被処理基板に付着した異物数を、ウェハ表面検査装置LS6600(日立電子エンジニアリング社製)を用いて計測した。一般に異物数は、ばらつきが大きいほか、装置の状態に依存し、装置状態の変動に伴い経時的に変化する。これに対応し、初期設定なしと初期設定ありの2条件を交互に繰り返して測定することで、両者の差異を調べた。初期設定なしに対して初期設定ありで異物数の平均値はおよそ半減しており、整合器設定値の初期設定により異物低減できることを確認した。
FIG. 6 shows the case where the ignition delay time is shortened by storing the setting value of the
本発明の第2の実施例を、図7ないし図9により説明する。図7は、実施例2に係るプラズマ処理装置の概略構成を示す縦断面図である。図7において、図3と同一符号は同一部材を示し、説明を省略する。図7において図3と異なる点は、プラズマの着火に磁場を用いる点と、磁場を最適化してプラズマの着火を容易にし、着火時間を短縮する点にある。図7において、処理室1の上部外側には磁場発生装置11が設けられている。磁場発生装置11には磁場発生用電源12が接続され、磁場発生用電源12には制御装置13が接続され、磁場強度および磁場勾配を調整可能になっている。また、制御装置13は高周波電源5の制御も行う。
A second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a longitudinal sectional view illustrating a schematic configuration of the plasma processing apparatus according to the second embodiment. 7, the same reference numerals as those in FIG. 3 denote the same members, and a description thereof is omitted. 7 differs from FIG. 3 in that a magnetic field is used for plasma ignition, and that the magnetic field is optimized to facilitate plasma ignition and shorten the ignition time. In FIG. 7, a
制御装置13は、処理室1内にプラズマを着火させるのに容易となるように磁場を調整するとともに、プラズマ着火後は処理に適した磁場に調整する。制御装置13には、予めプラズマ着火に最適な磁場の設定値と、処理に最適な磁場の設定値とが記憶されている。
The
上述の構成の装置によれば、高周波電力の投入とともに制御装置13によってプラズマの着火が容易な磁場設定を行い(図8のステップ201)、プラズマが着火されたら処理に最適な磁場設定に変更して(図8のステップ202)被処理基板の処理を行う。プラズマ着火のステップから処理のステップへの移行は磁場の変更だけなのでプラズマは連続したままであり、処理室1内の異物をプラズマ内に閉じ込めたままにすることができる。これにより、磁場を用いたプラズマ処理装置においてプラズマの着火を容易にして着火までの時間を短縮できるので、異物が基板に到達するまでにプラズマを着火でき、基板への異物の付着を低減することができる。
According to the apparatus having the above-described configuration, the magnetic field setting that facilitates ignition of the plasma is performed by the
プラズマ着火に適した磁場を適用する時間は、プラズマ着火に要する時間と同じか長くすればよい。プラズマの着火を検出して処理に最適な磁場設定に移行しても良いし、プラズマの着火を検出しないでプラズマ着火に要する時間以上の一定時間を経過後、処理に適した磁場に移行しても良い。プラズマ着火に適した磁場は、必ずしもプラズマ処理に適しているとは限らないため、長時間適用するとプラズマ処理に悪影響を与える可能性がある。そのためプラズマ処理最適化の観点からは、プラズマ着火に適した磁場の適用時間は短いことが望ましい。ガス種や圧力等の条件により異なるが、概ねプラズマ着火に適した磁場を適用することで、着火遅れ時間は数ミリ秒程度に短縮できることが多い。プラズマ着火に適した磁場を一定時間適用する場合には、1〜2秒程度の時間継続すれば充分であることが多い。 The time for applying a magnetic field suitable for plasma ignition may be the same as or longer than the time required for plasma ignition. It is possible to detect the ignition of the plasma and shift to the optimum magnetic field setting for the process, or after a certain time longer than the time required for the plasma ignition without detecting the ignition of the plasma, shift to the magnetic field suitable for the process. Also good. Since a magnetic field suitable for plasma ignition is not necessarily suitable for plasma processing, it may adversely affect the plasma processing when applied for a long time. Therefore, from the viewpoint of plasma processing optimization, it is desirable that the application time of the magnetic field suitable for plasma ignition is short. Although it depends on conditions such as gas type and pressure, the ignition delay time can often be shortened to several milliseconds by applying a magnetic field suitable for plasma ignition. When a magnetic field suitable for plasma ignition is applied for a certain period of time, it is often sufficient to continue for about 1 to 2 seconds.
上述のように、プラズマ着火に適した磁場を適用するステップでプラズマ処理が進行すると、プラズマ処理特性に悪影響を与える可能性がある。本実施例のエッチング処理の場合には、被処理基板に与えるバイアス電力が小さいかまたは与えない場合には、被処理基板のエッチングがあまり進まないことが知られている。そこでプラズマ着火に適した磁場を適用するステップではバイアス電力を小さくするか、与えないことが望ましい。 As described above, if the plasma processing proceeds in the step of applying a magnetic field suitable for plasma ignition, the plasma processing characteristics may be adversely affected. In the case of the etching process of this embodiment, it is known that the etching of the substrate to be processed does not progress so much when the bias power applied to the substrate to be processed is small or not applied. Therefore, it is desirable that the bias power be reduced or not applied in the step of applying a magnetic field suitable for plasma ignition.
プラズマ着火に適した磁場は、電子サイクロトロン共鳴現象を用いることで構成できることが多い。磁場が印加された空間内で電子は磁力線に巻きつくように運動することが知られており、サイクロトロン運動と呼ばれる。電子サイクロトロン共鳴現象とは、サイクロトロン運動の周期と高周波の周期(周波数の逆数)が一致して高周波のエネルギーが効率よく電子に供給される現象を呼ぶ。電子を効率よく加速できるため、プラズマ着火を容易にする効果がある。 A magnetic field suitable for plasma ignition can often be constructed by using electron cyclotron resonance phenomenon. It is known that electrons move so as to wrap around magnetic field lines in a space to which a magnetic field is applied, which is called cyclotron motion. The electron cyclotron resonance phenomenon refers to a phenomenon in which high-frequency energy is efficiently supplied to electrons by matching the period of cyclotron motion with the high-frequency period (the reciprocal of the frequency). Since electrons can be accelerated efficiently, there is an effect of facilitating plasma ignition.
図9に、着火に適した磁場を用いたステップを用いて着火した場合(着火ステップあり)と用いない場合(着火ステップなし)で異物数を比較した結果を示す。図6と同様、異物数の評価には、被処理基板に付着した異物数をウェハ表面検査装置LS6600(日立電子エンジニアリング社製)を用いて計測した。また、異物数は、ばらつきが大きく、装置の状態に依存し、経時的に変化するため、着火ステップありと着火ステップなしの2条件を交互に繰り返して測定することで、両者の差異を調べた。着火ステップありの場合で着火ステップなしの場合に比べて、異物数がおよそ半減しており、磁場を用いた着火ステップの適用により異物数を低減できることを確認した。 FIG. 9 shows the result of comparison of the number of foreign objects when ignition is performed using a step using a magnetic field suitable for ignition (with an ignition step) and when not using (without an ignition step). As in FIG. 6, the number of foreign matters was measured using a wafer surface inspection apparatus LS6600 (manufactured by Hitachi Electronics Engineering) for the evaluation of the number of foreign matters. In addition, since the number of foreign objects varies widely and depends on the state of the device and changes over time, the difference between the two was investigated by measuring alternately two conditions with and without an ignition step. . It was confirmed that the number of foreign objects was approximately halved in the case with an ignition step compared to the case without an ignition step, and that the number of foreign objects could be reduced by applying an ignition step using a magnetic field.
本発明の第3の実施例を図10により説明する。図10は、実施例3に係るプラズマ処理装置の概略構成を示す縦断面図である。図10において、図3と同一符号は同一部材を示し、説明を省略する。図10において図3と異なる点は、処理室1に圧力センサ17を設け、圧力センサ17と制御装置18を接続し、ガス供給系のガス供給装置16および真空排気系の圧力調整弁14と制御装置18とを接続して、制御装置18によってプラズマの着火までと着火後の処理室内の圧力を調整可能にしてある点である。
A third embodiment of the present invention will be described with reference to FIG. FIG. 10 is a longitudinal sectional view illustrating a schematic configuration of the plasma processing apparatus according to the third embodiment. 10, the same reference numerals as those in FIG. 3 denote the same members, and a description thereof is omitted. 10 differs from FIG. 3 in that a
制御装置18は、プラズマの着火前の処理室の圧力を処理圧力よりも高め、着火後は処理室内の圧力を下げて所定の処理圧力に制御する。
The
上述のように構成した装置によれば、プラズマ着火前は、処理室内のガス圧力が高く設定されているので電力を投入することによりプラズマが着火され易くなる。プラズマ着火後は、ガス圧力を所定圧力に下げるだけなのでプラズマは連続したままであり、処理室1内の異物をプラズマ内に閉じ込めたままにすることができる。
According to the apparatus configured as described above, before the plasma is ignited, the gas pressure in the processing chamber is set high, so that the plasma is easily ignited by turning on the power. After the plasma is ignited, since the gas pressure is only lowered to a predetermined pressure, the plasma remains continuous, and the foreign matter in the
これにより、高真空の処理条件を用いたプラズマ処理装置においてプラズマの着火を容易にして着火までの時間を短縮できるので、異物が基板に到達するまでにプラズマを着火でき、基板への異物の付着を低減することができる。 This facilitates plasma ignition and shortens the time to ignition in a plasma processing apparatus using high vacuum processing conditions, so that the plasma can be ignited before the foreign material reaches the substrate, and the foreign material adheres to the substrate. Can be reduced.
以上、プラズマ着火時に圧力を高くすることで着火を容易にする例を説明したが、ガス種と混合比、基準とする圧力によっては、圧力を下げることで着火しやすくなる場合もある。例えば直流放電の場合には、パッシェンの法則で知られるように、ガス種によって放電のしやすさに最適な圧力が存在することが知られている。同様に高周波放電の場合にも低圧にすることで着火性が向上する場合には、着火前の圧力を処理圧力より低く設定しても良い。 As described above, the example of facilitating the ignition by increasing the pressure at the time of plasma ignition has been described. However, depending on the gas type, the mixing ratio, and the reference pressure, ignition may be facilitated by reducing the pressure. For example, in the case of direct current discharge, as is known from Paschen's law, it is known that there is an optimum pressure for the ease of discharge depending on the gas type. Similarly, in the case of high-frequency discharge, if the ignitability is improved by reducing the pressure, the pressure before ignition may be set lower than the processing pressure.
本発明の第4の実施例を、図11ないし図12により説明する。図11は、プラズマ処理装置の概略構成を示す縦断面図である。図11において、図3と同一符号は同一部材を示し、説明を省略する。図11において図3と異なる点は、プラズマ着火検出器19と、バイアス整合器3およびバイアス電源4を制御するための制御装置20を備えていることである。
A fourth embodiment of the present invention will be described with reference to FIGS. FIG. 11 is a longitudinal sectional view showing a schematic configuration of the plasma processing apparatus. In FIG. 11, the same reference numerals as those in FIG. 11 differs from FIG. 3 in that a
予めプラズマ処理条件に応じて、バイアス電力の反射波を低減できるバイアス整合器3の設定を制御装置20により記憶しておく。プラズマ着火前に制御装置20は記憶しておいた設定値をバイアス整合器3に設定し、プラズマを発生する。プラズマ着火検出器19による着火検出と同時に制御装置20はバイアス電源4よりバイアス電力を出力させる。予めバイアス整合器がプラズマ着火後のインピーダンスに応じて設定されているため、バイアス電力印加直後から反射波は抑制され、被処理基板5に速やかにバイアス電位が印加される。
The setting of the
被処理基板にプラズマ着火直後からバイアス電位を印加する効果を、図12を用いて説明する。着火直後のプラズマは、不安定でシースの形成が不十分である。そのため、図12に示すように、着火直後に異物が被処理基板付近に到達すると、シースが異物をプラズマ中に閉じ込める効果も充分でなく、被処理基板に異物が付着する可能性が高い。しかし被処理基板にバイアス電位が印加されていると、シース中の電子が排除され、シースが厚くなることが知られている。シースとプラズマの界面に異物は捕獲されるため、シースを厚くすることで被処理基板から離れた位置に異物が捕獲され、被処理基板への付着を抑制することができる。 The effect of applying a bias potential to the substrate to be processed immediately after plasma ignition will be described with reference to FIG. The plasma immediately after ignition is unstable and the formation of the sheath is insufficient. For this reason, as shown in FIG. 12, when the foreign matter reaches the vicinity of the substrate to be processed immediately after ignition, the sheath does not have a sufficient effect of trapping the foreign matter in the plasma, and there is a high possibility that the foreign matter adheres to the substrate to be processed. However, it is known that when a bias potential is applied to the substrate to be processed, electrons in the sheath are eliminated and the sheath becomes thick. Since the foreign matter is captured at the interface between the sheath and the plasma, by increasing the thickness of the sheath, the foreign matter is captured at a position away from the target substrate, and adhesion to the target substrate can be suppressed.
本発明の第4の実施例を、図13により説明する。図13は、第4の実施例に係るプラズマ処理装置の概略構成を示す縦断面図である。図13において、図3と同一符号は同一部材を示し、説明を省略する。図13において図3と異なる点は、制御装置21が高周波電源9および整合器8、バイアス電源4およびバイアス整合器3をそれぞれ制御する点である。プラズマ着火するために高周波電力を処理室に投入するが、高周波電力の投入と同時にバイアス電源4より整合器3、基板電極2を介して被処理基板5にバイアス電力を投入する点である。バイアス整合器3および整合器8の初期設定を実施例1、実施例4と同様に電力投入初期から整合が取れるように設定しておくことが望ましいが、必ずしも必須ではない。高周波電力とバイアス電力を同時に印加することで実施例4と同様にプラズマプラズマ着火直後のシース形成が不十分な時にバイアス電位がシースに加わることで、異物の被処理基板への落下をより強力に防止することができる。
A fourth embodiment of the present invention will be described with reference to FIG. FIG. 13 is a longitudinal sectional view showing a schematic configuration of a plasma processing apparatus according to the fourth embodiment. In FIG. 13, the same reference numerals as those in FIG. 13 differs from FIG. 3 in that the
1…処理室、2…基板電極、3…整合器、4…高周波バイアス電源、5…被処理基板、6…シャワープレート、7…電極、8…整合器、9…高周波電源、10…制御装置、11…磁場発生装置、12…磁場発生用電源、13…制御装置、14…圧力調整弁、15…真空排気装置、16…ガス供給装置、17…圧力センサ、18…制御装置、19…プラズマモニタ、20…制御装置、21…制御装置。
DESCRIPTION OF
Claims (7)
前記プラズマ処理室に処理ガスを供給するガス供給装置と、
前記プラズマ処理室に整合器を介してプラズマを生成するための高周波電力を供給する高周波電源と、
予め取得されたプラズマが着火するまでの前記整合器の設定値の時系列データを基にプラズマが着火する前の時刻における前記整合器の設定値を保存し、前記被処理基板の前記プラズマ処理を実行する時、前記整合器の初期設定値を前記保存された設定値とする制御を行う制御装置とを備え、
前記プラズマが着火する前の時刻を前記プラズマが着火する時刻より前記高周波電力の供給によって発生した異物が前記被処理基板に到達する時間だけ前の時刻から前記プラズマが着火する時刻までの間の時刻または、前記プラズマが着火する時刻より前記高周波電力の供給によって発生した異物が前記被処理基板に到達する時間からプラズマが安定するのに要する時間を減じた時間だけ前の時刻から前記プラズマが着火する時刻までの間の時刻とすることによって、前記高周波電力の供給により発生した異物が前記被処理基板に到達するまでに前記プラズマを着火させることを特徴とするプラズマ処理装置。 In a plasma processing apparatus for plasma processing a substrate to be processed in a plasma processing chamber,
A gas supply device for supplying a processing gas to the plasma processing chamber;
A high-frequency power source for supplying high-frequency power for generating plasma to the plasma processing chamber via a matching unit;
The set value of the matching unit at a time before the plasma is ignited based on the time series data of the set value of the matching unit until the plasma is ignited in advance, and the plasma processing of the substrate to be processed is performed. A control device that performs control to perform the initial setting value of the matching unit as the stored setting value when executing,
Time between the time earlier by time foreign matter generated reaches the substrate to be treated by the supply of the previous time the more the time that the plasma is ignited frequency power the plasma is ignited until the time the plasma is ignited Alternatively, the plasma is ignited from the time before the time when the foreign matter generated by supplying the high-frequency power reaches the substrate to be processed is less than the time required for the plasma to be stabilized from the time when the plasma is ignited. A plasma processing apparatus characterized in that the plasma is ignited until the foreign matter generated by the supply of the high-frequency power reaches the substrate to be processed by setting the time between the time.
前記プラズマ処理室に処理ガスを供給するガス供給装置と、
前記プラズマ処理室に整合器を介してプラズマを生成するための高周波電力を供給する高周波電源と
前記プラズマ処理室に電子サイクロトロン共鳴現象を用いた磁場を発生させる磁場発生用電源と、
前記被処理基板の前記プラズマ処理を実行する時、プラズマが着火する前に前記電子サイクロトロン共鳴現象を用いた磁場が予め定められた前記プラズマの着火に最適な磁場の設定値に調整されるように前記磁場発生用電源を制御する制御装置とを備え、
前記高周波電力の供給とともに前記制御装置により、前記プラズマの着火が容易となる磁場の設定を行うことによって、前記高周波電力の供給により発生した異物が前記被処理基板に到達するまでに前記プラズマを着火させることを特徴とするプラズマ処理装置。 In a plasma processing apparatus for plasma processing a substrate to be processed in a plasma processing chamber,
A gas supply device for supplying a processing gas to the plasma processing chamber;
A high-frequency power source for supplying high-frequency power for generating plasma to the plasma processing chamber via a matching unit; a magnetic field generating power source for generating a magnetic field using an electron cyclotron resonance phenomenon in the plasma processing chamber;
When performing the plasma treatment of the substrate to be treated, so that the electron cyclotron resonance phenomenon magnetic field with is adjusted to the optimum magnetic field settings to ignition of the predetermined said plasma before the plasma is ignited A control device for controlling the magnetic field generating power supply,
By setting the magnetic field that facilitates the ignition of the plasma by the control device together with the supply of the high-frequency power, the foreign matter generated by the supply of the high-frequency power is ignited until the foreign substance reaches the substrate to be processed. the plasma processing apparatus characterized by causing.
前記プラズマ処理室に処理ガスを供給するガス供給装置と、
前記プラズマ処理室に整合器を介してプラズマを生成するための高周波電力を供給する高周波電源と、
前記プラズマ処理室内の圧力を調整する圧力調整弁と、
前記被処理基板の前記プラズマ処理を実行する時、プラズマが着火する前の前記プラズマ処理室内の圧力が前記プラズマ処理時の所定の圧力より高くなるように前記圧力調整弁を制御する制御装置とを備え、
前記制御装置により、前記高周波電力の供給よりも前に前記プラズマ処理室内の圧力が前記プラズマ処理時の所定の圧力より高くなるように前記圧力調整弁を制御し、前記プラズマ処理室内のガス圧力が高く設定された状態で前記高周波電力を供給することによって、前記高周波電力の供給により発生した異物が前記被処理基板に到達するまでに前記プラズマを着火させることを特徴とするプラズマ処理装置。 In a plasma processing apparatus for plasma processing a substrate to be processed in a plasma processing chamber,
A gas supply device for supplying a processing gas to the plasma processing chamber;
A high-frequency power source for supplying high-frequency power for generating plasma to the plasma processing chamber via a matching unit;
A pressure regulating valve for regulating the pressure in the plasma processing chamber;
When performing the plasma treatment of the substrate to be processed, a controller for controlling the pre-Symbol plasma treatment the pressure adjusting valve so that the pressure becomes higher than a predetermined pressure during the plasma treatment chamber prior to the plasma is ignited With
The control device controls the pressure regulating valve so that the pressure in the plasma processing chamber is higher than a predetermined pressure during the plasma processing before the supply of the high-frequency power, and the gas pressure in the plasma processing chamber is A plasma processing apparatus characterized in that, by supplying the high frequency power in a high setting state, the plasma is ignited until foreign matter generated by the supply of the high frequency power reaches the substrate to be processed .
前記プラズマ処理室内に設けられ、前記被処理基板を載置する被処理基板電極に高周波バイアス電力を供給する高周波バイアス電源とを備え、
前記制御装置は、前記高周波電力が供給されるとともに前記高周波バイアス電力を供給するように前記高周波電源および前記高周波バイアス電源を制御することを特徴とするプラズマ処理装置。 The plasma processing apparatus according to claim 1,
A high frequency bias power source that is provided in the plasma processing chamber and supplies a high frequency bias power to a substrate electrode to be processed on which the substrate to be processed is placed;
The control apparatus controls the high-frequency power source and the high-frequency bias power source so that the high-frequency power is supplied and the high-frequency bias power is supplied.
前記プラズマ処理室に処理ガスを供給するガス供給装置と、
前記プラズマ処理室に整合器を介してプラズマを生成するための高周波電力を供給する高周波電源とを備えるプラズマ処理装置を用いて前記被処理基板をプラズマ処理するプラズマ処理方法において、
予め取得されたプラズマが着火するまでの前記整合器の設定値の時系列データを基にプラズマが着火する前の時刻における前記整合器の設定値を保存し、前記被処理基板の前記プラズマ処理を実行する時、前記整合器の初期設定値を前記保存された設定値とする制御を行い、
前記プラズマが着火する前の時刻を前記プラズマが着火する時刻より前記高周波電力の供給によって発生した異物が前記被処理基板に到達する時間だけ前の時刻から前記プラズマが着火する時刻までの間の時刻または、前記プラズマが着火する時刻より前記高周波電力の供給によって発生した異物が前記被処理基板に到達する時間からプラズマが安定するのに要する時間を減じた時間だけ前の時刻から前記プラズマが着火する時刻までの間の時刻とすることによって、前記高周波電力の供給により発生した異物が前記被処理基板に到達するまでに前記プラズマを着火させることを特徴とするであることを特徴とするプラズマ処理方法。 A plasma processing chamber for plasma processing a substrate to be processed;
A gas supply device for supplying a processing gas to the plasma processing chamber;
In the plasma processing method for plasma processing the substrate to be processed using a plasma processing apparatus comprising a high-frequency power source for supplying high-frequency power for generating plasma to the plasma processing chamber via a matching unit,
The set value of the matching unit at a time before the plasma is ignited based on the time series data of the set value of the matching unit until the plasma is ignited in advance, and the plasma processing of the substrate to be processed is performed. When executing, the initial setting value of the matching device is controlled to be the stored setting value,
Time between the time earlier by time foreign matter generated reaches the substrate to be treated by the supply of the previous time the more the time that the plasma is ignited frequency power the plasma is ignited until the time the plasma is ignited Alternatively, the plasma is ignited from the time before the time when the foreign matter generated by supplying the high-frequency power reaches the substrate to be processed is less than the time required for the plasma to be stabilized from the time when the plasma is ignited. The plasma processing method is characterized in that the plasma is ignited before the foreign matter generated by the supply of the high-frequency power reaches the substrate to be processed by setting the time between the time. .
前記プラズマ処理室に処理ガスを供給するガス供給装置と、
前記プラズマ処理室に整合器を介してプラズマを生成するための高周波電力を供給する高周波電源と
前記プラズマ処理室に電子サイクロトロン共鳴現象を用いた磁場を発生させる磁場発生用電源とを備えるプラズマ処理装置を用いて前記被処理基板をプラズマ処理するプラズマ処理方法において、
前記被処理基板の前記プラズマ処理を実行する時、プラズマが着火する前に前記電子サイクロトロン共鳴現象を用いた磁場が予め定められた前記プラズマの着火に最適な磁場の設定値に調整されるように前記磁場発生用電源を制御し、
前記高周波電力の供給とともに前記制御装置により、前記プラズマの着火が容易となる磁場の設定を行うことによって、前記高周波電力の供給により発生した異物が前記被処理基板に到達するまでに前記プラズマを着火させることを特徴とするプラズマ処理方法。 A plasma processing chamber for plasma processing a substrate to be processed;
A gas supply device for supplying a processing gas to the plasma processing chamber;
A plasma processing apparatus comprising: a high-frequency power source that supplies high-frequency power for generating plasma to the plasma processing chamber via a matching unit; and a magnetic field generation power source that generates a magnetic field using an electron cyclotron resonance phenomenon in the plasma processing chamber In the plasma processing method of plasma processing the substrate to be processed using
Wherein when performing the plasma treatment of the substrate to be processed, to so that is adjusted to the optimum magnetic field settings to ignition of the electron cyclotron resonance the plasma phenomenon magnetic field with the predetermined before the plasma is ignited Controlling the power source for generating the magnetic field,
By setting the magnetic field that facilitates the ignition of the plasma by the control device together with the supply of the high-frequency power, the foreign matter generated by the supply of the high-frequency power is ignited until the foreign substance reaches the substrate to be processed. the plasma processing method characterized in that cause.
前記プラズマ処理室に処理ガスを供給するガス供給装置と、
前記プラズマ処理室に整合器を介してプラズマを生成するための高周波電力を供給する高周波電源と
前記プラズマ処理室内の圧力を調整する圧力調整弁とを備えるプラズマ処理装置を用いて前記被処理基板をプラズマ処理するプラズマ処理方法において、
前記被処理基板の前記プラズマ処理を実行する時、プラズマが着火する前の前記プラズマ処理室内の圧力が前記プラズマ処理時の所定の圧力より高くなるように前記圧力調整弁を制御し、
前記制御装置により、前記高周波電力の供給よりも前に前記プラズマ処理室内の圧力が前記プラズマ処理時の所定の圧力より高くなるように前記圧力調整弁を制御し、前記プラズマ処理室内のガス圧力が高く設定された状態で前記高周波電力を供給することによって、前記高周波電力の供給により発生した異物が前記被処理基板に到達するまでに前記プラズマを着火させることを特徴とするプラズマ処理方法。 A plasma processing chamber for plasma processing a substrate to be processed;
A gas supply device for supplying a processing gas to the plasma processing chamber;
The substrate to be processed using a plasma processing apparatus comprising: a high-frequency power source for supplying high-frequency power for generating plasma to the plasma processing chamber via a matching unit; and a pressure adjusting valve for adjusting a pressure in the plasma processing chamber. In the plasma processing method for plasma processing,
Wherein when performing the plasma treatment of the substrate to be processed, and controls the pre-Symbol plasma treatment the pressure adjusting valve so that the pressure becomes higher than a predetermined pressure during the plasma treatment chamber prior to the plasma is ignited,
The control device controls the pressure regulating valve so that the pressure in the plasma processing chamber is higher than a predetermined pressure during the plasma processing before the supply of the high-frequency power, and the gas pressure in the plasma processing chamber is A plasma processing method comprising: igniting the plasma until foreign matter generated by the supply of the high-frequency power reaches the substrate to be processed by supplying the high-frequency power in a high setting state .
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