JP2012138581A - Plasma processing apparatus and plasma processing method - Google Patents

Plasma processing apparatus and plasma processing method Download PDF

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JP2012138581A
JP2012138581A JP2012001894A JP2012001894A JP2012138581A JP 2012138581 A JP2012138581 A JP 2012138581A JP 2012001894 A JP2012001894 A JP 2012001894A JP 2012001894 A JP2012001894 A JP 2012001894A JP 2012138581 A JP2012138581 A JP 2012138581A
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substrate
voltage
processed
plasma processing
frequency bias
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Hitoshi Tamura
仁 田村
Hisateru Yasui
尚輝 安井
Seiichi Watanabe
成一 渡辺
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Hitachi High Tech Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a plasma processing apparatus and a plasma processing method which allow high accuracy plasma processing.SOLUTION: A plasma processing apparatus comprises a calculation unit 302 which estimates the voltage Vw of a processed substrate by using the high frequency bias voltage Vesc and the high frequency bias current Iesc stored in a measurement storage unit 301, the resistance component Resc, the inductance component Lesc and the capacity component Cesc of an electrostatic chuck mechanism stored in the measurement storage unit 301, and an integration constant A; and a control unit 303 which creates a control signal of a high frequency bias power supply 117 based on the voltage Vw of a processed substrate estimated by the calculation unit 302 and transmits the control signal to the high frequency bias power supply 117.

Description

本発明は、プラズマ処理装置に係り、特に被処理基板に対するプラズマ処理の高精度化と高性能化を図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 more particularly to a plasma processing apparatus and a plasma processing method suitable for improving the accuracy and performance of plasma processing on a substrate to be processed.

一般にプラズマ処理装置、特にプラズマエッチング装置は、被処理基板に高周波バイアス電位(バイアス電圧)を与えることで、プラズマ中のイオンのエネルギーを制御して、プラズマ処理の高性能化と高精度化を図ることが多い。   In general, a plasma processing apparatus, particularly a plasma etching apparatus, imparts a high-frequency bias potential (bias voltage) to a substrate to be processed, thereby controlling the energy of ions in the plasma to improve the performance and accuracy of the plasma processing. There are many cases.

また、被処理基板の温度もプラズマ処理の品質には大きな影響を与えるために、被処理基板の温度制御性を高めることが重要である。これに対応して、被処理基板を基板電極に静電的に吸着させ、被処理基板と基板電極の間に温度制御用のガスを介在させて被処理基板の温度制御を高精度に行うことを狙った構造を採用することが多い。   Further, since the temperature of the substrate to be processed has a great influence on the quality of the plasma processing, it is important to improve the temperature controllability of the substrate to be processed. Correspondingly, the substrate to be processed is electrostatically adsorbed to the substrate electrode, and a temperature control gas is interposed between the substrate to be processed and the substrate electrode, and the temperature of the substrate to be processed is controlled with high accuracy. Often adopts a structure aimed at

この種の従来技術を用いたプラズマ処理装置としては、プラズマエッチング装置がある。プラズマエッチング装置の処理室内にプラズマを発生させ、プラズマ中のイオンを被処理基板に引き込むために、前述の静電的に被処理基板を吸着させることのできる構造体(以下、静電チャックと呼ぶ)を介して高周波バイアス電位を与えることが多い(例えば、特許文献1参照)。   As a plasma processing apparatus using this type of conventional technology, there is a plasma etching apparatus. In order to generate plasma in the processing chamber of the plasma etching apparatus and draw ions in the plasma to the substrate to be processed, the structure that can electrostatically adsorb the substrate to be processed (hereinafter referred to as an electrostatic chuck). In many cases, a high-frequency bias potential is applied through the method (see, for example, Patent Document 1).

特開2004−193564号公報JP 2004-193564 A

しかし、特許文献1に記載の技術では、被処理基板に印加された電圧波形をモニタするために、被処理基板の電流や電圧、電力、またはこれらの演算量を用いることの記載があるが、これらのモニタ量から被処理基板の電圧波形を演算する方法等についての開示が充分で無く、被処理基板の電圧を所望の波形に制御することが事実上困難であった。   However, in the technique described in Patent Document 1, there is a description of using the current, voltage, power, or calculation amount of the substrate to be processed in order to monitor the voltage waveform applied to the substrate to be processed. A method for calculating the voltage waveform of the substrate to be processed from these monitored amounts is not sufficiently disclosed, and it is practically difficult to control the voltage of the substrate to be processed to a desired waveform.

静電チャックでは直流的な高電圧を静電チャック内の電極に加えなければならないため、直接被処理基板に印加されるバイアス電位を計測できず、静電チャック機構の電圧やバイアス電源の出力電力と反射電力を計測するに留まっていた。上記従来技術では、このように被処理基板に与えるバイアス電位を計測する手段が充分で無いため、バイアス電位の制御性が悪いという課題があった。これにより、被処理基板のプラズマエッチング処理の高精度化と高品質化が充分に図れない場合があった。   In an electrostatic chuck, a DC high voltage must be applied to the electrode in the electrostatic chuck, so the bias potential applied directly to the substrate to be processed cannot be measured. The voltage of the electrostatic chuck mechanism and the output power of the bias power supply And stayed in measuring the reflected power. The prior art described above has a problem in that the controllability of the bias potential is poor because there is not enough means for measuring the bias potential applied to the substrate to be processed. As a result, there has been a case where high accuracy and high quality of the plasma etching processing of the substrate to be processed cannot be sufficiently achieved.

本発明の目的は、高精度に被処理基板の電圧制御を可能として、高精度なプラズマ処理が可能となるプラズマ処理装置およびプラズマ処理方法を提供することである。   An object of the present invention is to provide a plasma processing apparatus and a plasma processing method capable of controlling a voltage of a substrate to be processed with high accuracy and capable of performing high-precision plasma processing.

上記目的を達成するために、本発明のプラズマ処理装置は被処理基板をプラズマ処理するためのプラズマ処理装置において、前記被処理基板を収容する処理室と、前記被処理基板を静電的に吸着して保持する静電チャック機構を有する基板電極と、前記被処理基板に対してプラズマを供給するプラズマ生成手段と、前記基板電極の前記被処理基板にバイアス電圧を供給するバイアス電圧印加手段と、前記基板電極に載せた測定用被処理基板を用いて、前記測定用被処理基板から電圧を測定し、前記静電チャック機構の容量成分と、前記静電チャック機構に加えたバイアス電圧と、前記静電チャック機構を流れるバイアス電流とを用いて、取得した前記静電チャック機構のインピーダンス値を、格納するインピーダンス値格納手段と、を備え、実際にプラズマ処理しようとする前記被処理基板に与えるバイアス電圧値とバイアス電流値と、前記静電チャック機構の前記取得したインピーダンス値を用いて、プラズマ処理しようとする前記被処理基板の電圧を推定する。   In order to achieve the above object, a plasma processing apparatus of the present invention is a plasma processing apparatus for plasma processing a substrate to be processed, in which a processing chamber for accommodating the substrate to be processed and the substrate to be processed are electrostatically attracted. A substrate electrode having an electrostatic chuck mechanism to hold, a plasma generating means for supplying plasma to the substrate to be processed, a bias voltage applying means for supplying a bias voltage to the substrate to be processed of the substrate electrode, Using the measurement target substrate placed on the substrate electrode, the voltage is measured from the measurement target substrate, the capacitive component of the electrostatic chuck mechanism, the bias voltage applied to the electrostatic chuck mechanism, Impedance value storage means for storing the acquired impedance value of the electrostatic chuck mechanism using a bias current flowing through the electrostatic chuck mechanism, and The voltage of the substrate to be processed is estimated using the bias voltage value and the bias current value applied to the substrate to be processed during plasma processing and the acquired impedance value of the electrostatic chuck mechanism. To do.

本発明は、上記プラズマ処理装置において、推定された前記被処理基板の電位を用いて、前記バイアス電圧印加手段の電源出力を制御する。   In the plasma processing apparatus, the power supply output of the bias voltage applying unit is controlled using the estimated potential of the substrate to be processed.

本発明は、上記プラズマ処理装置において、前記インピーダンス値格納手段は、静電チャック機構に印加するバイアス電圧、バイアス電流を取り入れて格納し、前記静電チャック機構の電気特性であるインピーダンス値を格納し、前記被処理基板の電圧値を推定する手段は、前記インピーダンス値格納手段に格納された、前記静電チャック機構に印加する電圧と電流と、前記静電チャック機構の電気特性であるインピーダンス値とから前記被処理基板の電圧値を推定し、制御ユニットは、前記被処理基板の電圧値を推定する手段で推定された前記被処理基板の電圧値の推定値に基づいて、前記バイアス電圧印加手段の制御信号を作成して前記バイアス電圧印加手段に与える。   According to the present invention, in the plasma processing apparatus, the impedance value storage means stores a bias voltage and a bias current applied to the electrostatic chuck mechanism, and stores an impedance value that is an electrical characteristic of the electrostatic chuck mechanism. The means for estimating the voltage value of the substrate to be processed includes: a voltage and a current applied to the electrostatic chuck mechanism stored in the impedance value storage means; and an impedance value that is an electrical characteristic of the electrostatic chuck mechanism. The bias voltage applying means based on the estimated value of the voltage value of the substrate to be processed estimated by the means for estimating the voltage value of the substrate to be processed. The control signal is generated and applied to the bias voltage applying means.

本発明は、上記プラズマ処理装置において、前記被処理基板の電圧のサグを平坦化するように前記被処理基板の前記バイアス電圧値の波形を制御する。   In the plasma processing apparatus, the waveform of the bias voltage value of the substrate to be processed is controlled so as to flatten the sag of the voltage of the substrate to be processed.

上記課題を解決するために、本発明は、被処理基板をプラズマ処理するためのプラズマ処理方法において、前記被処理基板を処理室に収容して、前記被処理基板を基板電極の静電チャック機構に静電的に吸着して保持し、前記被処理基板に対してプラズマ生成手段からプラズマを供給し、前記基板電極の前記被処理基板にバイアス電圧印加手段からバイアス電圧を供給する際に、前記基板電極に載せた測定用被処理基板を用いて、前記測定用被処理基板から電圧を測定し、前記静電チャック機構の容量成分と、前記静電チャック機構に加えたバイアス電圧と、前記静電チャック機構を流れるバイアス電流とを用いて、前記静電チャック機構のインピーダンス値を取得して、前記取得した前記静電チャック機構のインピーダンス値をインピーダンス値格納手段に格納し、実際にプラズマ処理しようとする前記被処理基板に与えるバイアス電圧値とバイアス電流値と、前記静電チャック機構の前記取得したインピーダンス値を用いて、プラズマ処理しようとする前記被処理基板の電圧を推定する。   In order to solve the above problems, the present invention provides a plasma processing method for plasma processing a substrate to be processed, wherein the substrate to be processed is accommodated in a processing chamber and the substrate to be processed is an electrostatic chuck mechanism for a substrate electrode. When the plasma is supplied from the plasma generation unit to the substrate to be processed and the bias voltage is supplied from the bias voltage application unit to the substrate to be processed of the substrate electrode, Using a measurement target substrate placed on a substrate electrode, a voltage is measured from the measurement target substrate, a capacitance component of the electrostatic chuck mechanism, a bias voltage applied to the electrostatic chuck mechanism, and the static An impedance value of the electrostatic chuck mechanism is obtained using a bias current flowing through the electric chuck mechanism, and the impedance value of the obtained electrostatic chuck mechanism is impeded Using the bias voltage value and bias current value stored in the storage value storage means and actually applied to the substrate to be plasma processed, and the acquired impedance value of the electrostatic chuck mechanism, plasma processing is to be performed. The voltage of the substrate to be processed is estimated.

本発明は、上記プラズマ処理方法において、推定された前記被処理基板の電位を用いて、前記バイアス電圧印加手段の電源出力を制御する。さらに、本発明は、上記プラズマ処理方法において、前記被処理基板の電圧のサグを平坦化するように、前記被処理基板の前記バイアス電圧値の波形を制御する。   The present invention controls the power output of the bias voltage applying means using the estimated potential of the substrate to be processed in the plasma processing method. Furthermore, in the above plasma processing method, the present invention controls the waveform of the bias voltage value of the substrate to be processed so as to flatten the sag of the voltage of the substrate to be processed.

本発明は、上記プラズマ処理方法において、前記インピーダンス値格納手段は、静電チャック機構に印加するバイアス電圧、バイアス電流を取り入れて格納し、前記静電チャック機構の電気特性であるインピーダンス値を格納し、前記被処理基板の電圧値を推定する手段は、前記インピーダンス値格納手段に格納された、前記静電チャック機構に印加する電圧と電流と、前記静電チャック機構の電気特性であるインピーダンス値とから前記被処理基板の電圧値を推定し、制御ユニットは、前記被処理基板の電圧値を推定する手段で推定された前記被処理基板の電圧値の推定値に基づいて、前記バイアス電圧印加手段の制御信号を作成して前記バイアス電圧印加手段に与える。   According to the present invention, in the plasma processing method, the impedance value storage means takes in and stores a bias voltage and a bias current applied to the electrostatic chuck mechanism, and stores an impedance value that is an electrical characteristic of the electrostatic chuck mechanism. The means for estimating the voltage value of the substrate to be processed includes: a voltage and a current applied to the electrostatic chuck mechanism stored in the impedance value storage means; and an impedance value that is an electrical characteristic of the electrostatic chuck mechanism. The bias voltage applying means based on the estimated value of the voltage value of the substrate to be processed estimated by the means for estimating the voltage value of the substrate to be processed. The control signal is generated and applied to the bias voltage applying means.

本発明では、基板電極に載せた測定用被処理基板を用いて、測定用被処理基板から電圧を測定し、静電チャック機構の容量成分と、静電チャック機構に加えたバイアス電圧と、静電チャック機構を流れるバイアス電流とを用いて、取得した静電チャック機構のインピーダンス値を格納して、実際にプラズマ処理しようとする被処理基板に与えるバイアス電圧値とバイアス電流値と、静電チャック機構の取得したインピーダンス値を用いて、プラズマ処理しようとする被処理基板の電圧を推定する。これにより、本発明は、プラズマ処理装置において、高精度に被処理基板の電圧制御が可能となるので、高精度なプラズマ処理が可能となる効果がある。算出した被処理基板の電圧または電流をバイアス電源により制御することで、被処理基板のプラズマエッチング処理の高精度化と高品質化が充分に図れる。   In the present invention, the measurement target substrate placed on the substrate electrode is used to measure the voltage from the measurement target substrate, the capacitance component of the electrostatic chuck mechanism, the bias voltage applied to the electrostatic chuck mechanism, Using the bias current flowing through the electric chuck mechanism, the obtained impedance value of the electrostatic chuck mechanism is stored, and the bias voltage value and the bias current value to be applied to the substrate to be actually processed with plasma, and the electrostatic chuck The voltage of the substrate to be processed is estimated using the impedance value acquired by the mechanism. As a result, the present invention can control the voltage of the substrate to be processed with high accuracy in the plasma processing apparatus, and thus has an effect of enabling high-precision plasma processing. By controlling the calculated voltage or current of the substrate to be processed by a bias power source, it is possible to sufficiently improve the accuracy and quality of the plasma etching process of the substrate to be processed.

本発明を用いたプラズマ処理装置の一実施例を示す断面図である。It is sectional drawing which shows one Example of the plasma processing apparatus using this invention. 本発明の基板電極の周辺構造の説明図である。It is explanatory drawing of the peripheral structure of the board | substrate electrode of this invention. 本発明の基板電極各部の電圧または電流の測定値、被処理基板電圧の推定値を示す図である。It is a figure which shows the estimated value of the measured value of the voltage or electric current of each part of the board | substrate electrode of this invention, and a to-be-processed substrate voltage. 本発明の基板電極周辺の等価回路モデルを示す図である。It is a figure which shows the equivalent circuit model around the board | substrate electrode of this invention.

以下、本発明の実施例を、図面を用いて詳細に説明する。本発明のプラズマ処理装置を用いた第1の実施例として、プラズマエッチング装置を説明する。図1には、本実施例で用いられているプラズマエッチング装置の概略図を示す。図1のプラズマ処理装置は、高周波電源115により発生した高周波電力は、自動整合機114および同軸線路113を介して、アンテナ112に導入される。高周波電源115の発振周波数としては、450MHzを用いた。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A plasma etching apparatus will be described as a first embodiment using the plasma processing apparatus of the present invention. FIG. 1 shows a schematic diagram of a plasma etching apparatus used in this embodiment. In the plasma processing apparatus of FIG. 1, the high frequency power generated by the high frequency power supply 115 is introduced to the antenna 112 via the automatic matching machine 114 and the coaxial line 113. As the oscillation frequency of the high frequency power supply 115, 450 MHz was used.

図1のアンテナ112から放射された高周波は、電磁波導入窓111とシャワープレート110を介して、処理室101内に導入される。処理室101には、図示しない処理ガスの供給系、および真空排気系が接続されている。処理室101には、処理に適したガスを所定の流量分供給して排気することで、処理室101内をプラズマエッチング処理に適した圧力とガス雰囲気に調整することができる。処理ガスは、シャワープレート110により処理室101内にシャワー状に供給され、処理室101内のガス流れを処理に適した所定の分布に制御することができる。   The high frequency radiated from the antenna 112 in FIG. 1 is introduced into the processing chamber 101 through the electromagnetic wave introduction window 111 and the shower plate 110. A processing gas supply system and a vacuum exhaust system (not shown) are connected to the processing chamber 101. The processing chamber 101 can be adjusted to a pressure and gas atmosphere suitable for the plasma etching process by supplying a gas suitable for the processing at a predetermined flow rate and exhausting the processing chamber 101. The processing gas is supplied in a shower shape into the processing chamber 101 by the shower plate 110, and the gas flow in the processing chamber 101 can be controlled to a predetermined distribution suitable for processing.

図1の処理室101の周囲には、静磁界の発生手段としての電磁石118が設置されており、電磁石118は処理室101内に静磁界を加えることができる。周波数450MHzの高周波電力に対し、0.016テスラの静磁界を加えると、処理室101内のプラズマ中の電子のサイクロトロン周波数が450MHzとなり、電磁波が共鳴的に強く吸収される電子サイクロトロン共鳴現象が起きることが知られている。この電子サイクロトロン共鳴現象により、通常ではプラズマが発生できない極低圧力域等でもプラズマの発生が可能となり、このため被処理基板102に対してプラズマエッチングを行い得る条件が広く取れる利点がある。   An electromagnet 118 as a means for generating a static magnetic field is installed around the processing chamber 101 in FIG. 1, and the electromagnet 118 can apply a static magnetic field into the processing chamber 101. When a static magnetic field of 0.016 Tesla is applied to high-frequency power with a frequency of 450 MHz, the electron cyclotron frequency of electrons in the plasma in the processing chamber 101 becomes 450 MHz, and an electron cyclotron resonance phenomenon occurs in which electromagnetic waves are absorbed resonantly and strongly. It is known. Due to this electron cyclotron resonance phenomenon, plasma can be generated even in an extremely low pressure region where plasma cannot normally be generated. Therefore, there is an advantage that a wide range of conditions for performing plasma etching on the substrate to be processed 102 can be taken.

また、電子サイクロトロン共鳴を起こす0.016テスラとなる位置で強くプラズマが発生する傾向にあることから、0.016テスラとなる位置を制御してプラズマ発生位置を制御することができる。   In addition, since plasma tends to be strongly generated at a position where 0.016 Tesla that causes electron cyclotron resonance occurs, the position where the plasma becomes 0.016 Tesla can be controlled to control the plasma generation position.

さらに、図1の電磁石118を用いて処理室101内に静磁界を形成する別の効果として、プラズマ中の電子が静磁界に拘束される効果があるため、処理室101内におけるプラズマの拡散を制御でき、処理室101内でのプラズマ拡散制御によってもプラズマ密度分布を制御することが可能となる。本実施例では、同軸線路113を中心として、3つの電磁石118を同軸に設置することで静磁界の制御性を高めて、プラズマ密度分布の制御性を高めている。   Further, as another effect of forming a static magnetic field in the processing chamber 101 using the electromagnet 118 of FIG. 1, there is an effect that electrons in the plasma are restrained by the static magnetic field. It is possible to control the plasma density distribution by controlling the plasma diffusion in the processing chamber 101. In the present embodiment, the controllability of the static magnetic field is enhanced by installing the three electromagnets 118 coaxially with the coaxial line 113 as the center, thereby enhancing the controllability of the plasma density distribution.

図1の処理室101内には、被処理基板102を戴置するための基板電極103が設置されている。基板電極103には、被処理基板102にバイアス電位を与えるためのバイアス電源117が、自動整合機116を介して接続されている。バイアス電源117の発振周波数としては、400KHzを用いた。   In the processing chamber 101 of FIG. 1, a substrate electrode 103 for placing a substrate to be processed 102 is installed. A bias power source 117 for applying a bias potential to the substrate to be processed 102 is connected to the substrate electrode 103 via an automatic matching machine 116. As the oscillation frequency of the bias power source 117, 400 KHz was used.

図2に、この基板電極103付近の構造をより詳細に示す。被処理基板102を基板電極103上において保持するために、静電チャック機構200が用いられる。この静電チャック機構200は、主として誘電体層204と、この誘電体層204内に埋め込まれた電極層205と、下地層206とから構成される。電極層205には、直流電圧を印加するための直流電源203が、帯域阻止フィルタ209を介して接続されている。   FIG. 2 shows the structure near the substrate electrode 103 in more detail. In order to hold the substrate 102 to be processed on the substrate electrode 103, an electrostatic chuck mechanism 200 is used. The electrostatic chuck mechanism 200 is mainly composed of a dielectric layer 204, an electrode layer 205 embedded in the dielectric layer 204, and a base layer 206. A DC power source 203 for applying a DC voltage is connected to the electrode layer 205 via a band rejection filter 209.

図2の基板電極103は、サセプタ201と電極カバー202を有している。被処理基板102の周囲にはサセプタ201が設けられており、さらにサセプタ201の下部には電極カバー202が配置されていることで全体を覆っている。サセプタ201は、被処理基板102の周辺部の表面状態を制御するために設けられており、本実施例ではサセプタ201の材質としては、石英を用いた。電極カバー202の材質としては、陽極酸化したアルミニウムを用いた。   The substrate electrode 103 in FIG. 2 has a susceptor 201 and an electrode cover 202. A susceptor 201 is provided around the substrate to be processed 102, and an electrode cover 202 is disposed below the susceptor 201 to cover the whole. The susceptor 201 is provided to control the surface state of the peripheral portion of the substrate 102 to be processed. In this embodiment, quartz is used as the material of the susceptor 201. As the material of the electrode cover 202, anodized aluminum was used.

図2の基板電極103には、被処理基板102を静電気力により吸着するために、直流電源203によりプラスまたはマイナス側に数百ボルト程度の電圧を加える。直流電源203による電圧は、電極層205に印加される。誘電体層204は、比較的絶縁性の高い材料として例えばアルミナセラミックを主成分とし、二酸化ケイ素や酸化チタン等の材料の混合物で形成されている。   A voltage of about several hundred volts is applied to the substrate electrode 103 of FIG. 2 on the plus or minus side by the DC power source 203 in order to attract the substrate 102 to be processed by electrostatic force. A voltage from the DC power supply 203 is applied to the electrode layer 205. The dielectric layer 204 is made of, for example, alumina ceramic as a main component as a material having a relatively high insulating property, and is formed of a mixture of materials such as silicon dioxide and titanium oxide.

図2の直流電源203からの電圧により被処理基板102には電荷が誘起され、静電気力により被処理基板102を静電吸着することができる。直流電源203にはバイアス電源117からのバイアス電流が流れ込むことを防止するために、バイアス電源117からの電流を阻止するための帯域阻止フィルタ209を用いている。   Charge is induced in the substrate to be processed 102 by the voltage from the DC power supply 203 in FIG. 2, and the substrate to be processed 102 can be electrostatically adsorbed by electrostatic force. In order to prevent the bias current from the bias power supply 117 from flowing into the DC power supply 203, a band rejection filter 209 for blocking the current from the bias power supply 117 is used.

図2のバイアス電源117から供給される電圧と電流は、電圧モニタ(電圧計)207と電流モニタ(電流計)208によりそれぞれモニタすることができる。   The voltage and current supplied from the bias power source 117 in FIG. 2 can be monitored by a voltage monitor (voltmeter) 207 and a current monitor (ammeter) 208, respectively.

バイアス電源117からのバイアス電力は、静電チャック機構200の下地層206に加えられ、静電チャック機構200を介して被処理基板102に印加される。通常、静電チャック機構200は、高周波に対するインピーダンスの大きさが小さくなるように作られており、本質的に薄い絶縁膜層で構成されているため、電気的には概略、容量の大きなコンデンサとして働くことになる。   Bias power from the bias power source 117 is applied to the base layer 206 of the electrostatic chuck mechanism 200 and is applied to the substrate to be processed 102 via the electrostatic chuck mechanism 200. Usually, the electrostatic chuck mechanism 200 is made so that the impedance with respect to the high frequency is small, and is essentially composed of a thin insulating film layer. Will work.

本来的には、被処理基板102の表面の電位をモニタして、モニタした被処理基板102の表面の電位の値(電圧値)に基づいて、バイアス電源117のバイアス電圧出力等を制御すべきであるが、前述した様に静電チャック機構200を介してバイアス電力を被処理基板102に供給する構成をとっており、被処理基板102の表面の電位を直接測定することは事実上、困難である。   Originally, the potential of the surface of the substrate to be processed 102 should be monitored, and the bias voltage output of the bias power source 117 should be controlled based on the monitored potential value (voltage value) of the surface of the substrate 102 to be processed. However, as described above, the bias power is supplied to the substrate to be processed 102 via the electrostatic chuck mechanism 200, and it is practically difficult to directly measure the potential of the surface of the substrate 102 to be processed. It is.

そこで、静電チャック機構200での電圧降下や電力損失を無視して、静電チャック機構200に印加する電圧や電力のみを測定することが多い。   Therefore, in many cases, only the voltage and power applied to the electrostatic chuck mechanism 200 are measured ignoring the voltage drop and power loss in the electrostatic chuck mechanism 200.

ただし、静電チャック機構200を介して流れるバイアス電流が大きい場合や、静電チャック機構200のインピーダンスの大きさが大きい場合には、静電チャック機構200で生じる電圧降下が無視できなくなる場合が考えられる。   However, when the bias current flowing through the electrostatic chuck mechanism 200 is large or when the impedance of the electrostatic chuck mechanism 200 is large, the voltage drop generated in the electrostatic chuck mechanism 200 may not be ignored. It is done.

また、バイアス電源出力波形が正弦波ではなく、複数の周波数成分を含む場合には、各周波数成分に対する静電チャック機構のインピーダンスが異なるため、波形ひずみが生じることになる。時間的に繰り返し変化する電圧の大小を表現するのに、ピークトゥピーク電圧(peak−to−peak電圧)と呼ばれる表現方法が用いられることが多い。
このピークトゥピーク電圧とは、電圧の最大値から最小値を引いた値を指す。ピークトゥピーク電圧のみでは、波形ひずみが生じた場合には電圧の大小を正確に表現できているとは言いがたく、被処理基板102のプラズマ処理特性を安定して制御することは困難となる。
Further, when the bias power supply output waveform is not a sine wave but includes a plurality of frequency components, the impedance of the electrostatic chuck mechanism with respect to each frequency component is different, resulting in waveform distortion. An expression method called a peak-to-peak voltage is often used to express the magnitude of a voltage that changes repeatedly over time.
This peak-to-peak voltage refers to a value obtained by subtracting the minimum value from the maximum value of the voltage. With only the peak-to-peak voltage, it is difficult to accurately express the magnitude of the voltage when waveform distortion occurs, and it becomes difficult to stably control the plasma processing characteristics of the substrate 102 to be processed. .

そこで、本発明の実施例では、被処理基板102上に印加されるバイアス電圧を正確にモニタするために、電圧測定用プローブを付加した測定用被処理基板を用いてこの測定用被処理基板の表面のバイアス電圧を測定し、事前に静電チャック機構200の電気特性であるインピーダンスを取得しておき、さらに電圧モニタ207および電流モニタ208によりそれぞれ実際に処理しようとしている被処理基板102のモニタされたバイアス電源117のバイアス電圧およびバイアス電流を用いて、実際に処理しようとしている被処理基板102上のバイアス電圧を算出して推定することができる。   Therefore, in the embodiment of the present invention, in order to accurately monitor the bias voltage applied on the substrate 102 to be processed, the substrate to be measured is used by using the substrate to be measured to which a voltage measuring probe is added. The surface bias voltage is measured, the impedance which is the electrical characteristic of the electrostatic chuck mechanism 200 is acquired in advance, and the substrate to be processed 102 to be actually processed is monitored by the voltage monitor 207 and the current monitor 208, respectively. Using the bias voltage and bias current of the bias power source 117, it is possible to calculate and estimate the bias voltage on the substrate to be processed 102 that is actually to be processed.

図3(a)と図3(b)には、静電チャック機構200の電気特性を測定するために行ったバイアス電圧とバイアス電流の測定結果を示す。図3(a)の横軸は時間であり、縦軸は電圧と電流を示している。図3(b)の横軸は時間であり、縦軸は電圧を示している。図2に示す電圧モニタ207、電流モニタ208に加えて、電圧測定用プローブを付加した測定用被処理基板を、図2の基板電極103上に設置して、静電チャック機構200の各部のバイアス電圧とバイアス電流を測定した。   FIGS. 3A and 3B show the measurement results of the bias voltage and the bias current, which are performed to measure the electrical characteristics of the electrostatic chuck mechanism 200. FIG. In FIG. 3A, the horizontal axis represents time, and the vertical axis represents voltage and current. The horizontal axis of FIG.3 (b) is time, and the vertical axis | shaft has shown the voltage. In addition to the voltage monitor 207 and current monitor 208 shown in FIG. 2, a measurement target substrate to which a voltage measurement probe is added is placed on the substrate electrode 103 of FIG. The voltage and bias current were measured.

図2に示す電圧モニタ(電圧計)207、電流モニタ208(電流計)によって測定されたバイアス電圧Vescとバイアス電流Iescの経時変化を、図3(a)に示す。また、同時に測定用被処理基板上の電圧も計測した結果を、図3(b)に示す。   FIG. 3A shows temporal changes in the bias voltage Vesc and the bias current Iesc measured by the voltage monitor (voltmeter) 207 and the current monitor 208 (ammeter) shown in FIG. At the same time, the result of measuring the voltage on the measurement substrate is shown in FIG.

図2の静電チャック機構200に印加した電圧Vescの波形は、図3(a)に示すように、正弦波ではなく電圧の負側をクリップした波形とした。この場合に、前述のように静電チャック機構200が容量性インピーダンスを持つため、低周波成分が透過しにくく、被処理基板上の電圧Vwの波形は、図3(b)に示すように、クリップした部分に相当して、サグ300と呼ばれる傾きが生じている。このサグ300を平坦化するように、バイアス電圧Vescの波形を制御することにより、そろったイオンエネルギーを得ることができ、プラズマエッチングの効率と精度を上げることができる。   The waveform of the voltage Vesc applied to the electrostatic chuck mechanism 200 of FIG. 2 is a waveform obtained by clipping the negative side of the voltage instead of a sine wave as shown in FIG. In this case, since the electrostatic chuck mechanism 200 has capacitive impedance as described above, it is difficult for low frequency components to pass through, and the waveform of the voltage Vw on the substrate to be processed is as shown in FIG. An inclination called a sag 300 is generated corresponding to the clipped portion. By controlling the waveform of the bias voltage Vesc so as to flatten the sag 300, uniform ion energy can be obtained, and the efficiency and accuracy of plasma etching can be improved.

図3(a)、図3(b)に示す電圧波形と電流波形から、静電チャック機構200の容量Cescを、以下の手順で数値的に算出することができる。   From the voltage waveform and the current waveform shown in FIGS. 3A and 3B, the capacitance Cesc of the electrostatic chuck mechanism 200 can be calculated numerically by the following procedure.

図2のバイアス電源117による電流が流れる経路を、図4に示す等価回路でモデル化する。図4では、測定記憶ユニット301は、静電チャック機構200に印加する電圧値、電流値を取り入れて格納して、静電チャック機構200の電気特性であるインピーダンス値である容量Cescを格納する手段である。   The path through which the current from the bias power source 117 of FIG. 2 flows is modeled by the equivalent circuit shown in FIG. In FIG. 4, the measurement storage unit 301 takes in the voltage value and current value applied to the electrostatic chuck mechanism 200 and stores them, and stores the capacitance Cesc that is an impedance value that is an electrical characteristic of the electrostatic chuck mechanism 200. It is.

図4の計算ユニット302は、測定記憶ユニット301に格納された、静電チャック機構200に印加する電圧値、電流値と静電チャック機構200の電気特性であるインピーダンス値から、式(1)、または式(2)により、被処理基板の電圧値を推定する手段である。   The calculation unit 302 in FIG. 4 uses the voltage value and current value to be applied to the electrostatic chuck mechanism 200 stored in the measurement storage unit 301 and the impedance value which is the electrical characteristic of the electrostatic chuck mechanism 200 to obtain an expression (1), Or it is a means to estimate the voltage value of a to-be-processed substrate by Formula (2).

さらに、図4の制御ユニット303は、計算ユニット302で推定された被処理基板の電圧値の推定値に基づいて、バイアス電源117の制御信号を作成してバイアス電源117に与える手段である。   Further, the control unit 303 in FIG. 4 is means for creating a control signal for the bias power source 117 based on the estimated value of the voltage value of the substrate to be processed estimated by the calculation unit 302 and supplying the control signal to the bias power source 117.

ここで、静電チャック機構200のインピーダンス値である容量成分をCesc、図3(a)に示す静電チャック機構200に加えたバイアス電圧をVesc、図3(a)に示す静電チャック機構200を流れるバイアス電流をIesc、図3(b)に示す被処理基板102の電圧をVwとし、被処理基板102の電圧Vwを時間領域で表現すると、下記(1)式で表される。なお、(1)式において、Aは積分定数である。   Here, the capacitance component which is the impedance value of the electrostatic chuck mechanism 200 is Cesc, the bias voltage applied to the electrostatic chuck mechanism 200 shown in FIG. 3A is Vesc, and the electrostatic chuck mechanism 200 shown in FIG. When the bias current flowing through Iesc is Iesc, the voltage of the substrate to be processed 102 shown in FIG. 3B is Vw, and the voltage Vw of the substrate to be processed 102 is expressed in the time domain, it is expressed by the following equation (1). In the equation (1), A is an integral constant.

Figure 2012138581
Figure 2012138581

上記(1)式を周波数領域で表すと、下記(2)式で表される。   When the above expression (1) is expressed in the frequency domain, it is expressed by the following expression (2).

Figure 2012138581
Figure 2012138581

上記(1)式で推定した被処理基板の電圧Vwと、実測した被処理基板の電圧とを比較して、両者が最小二乗法的に誤差が最小になることを根拠に、静電チャック機構200のインピーダンスである容量成分Cescを算出し、さらにこの静電チャック機構200の容量成分Cescの値を用いて、(1)式で計算した被処理基板の電圧(被処理基板電圧推定値)を求めた。周波数領域の(2)式については、フーリエ級数展開により各周波数成分に分解した後、(2)式を各周波数成分に適用し、重ね合わせることで被処理基板102の電圧Vwを推定できる。   The electrostatic chuck mechanism is based on the fact that the voltage Vw of the substrate to be processed estimated by the above equation (1) is compared with the measured voltage of the substrate to be measured, and the error is minimized in the least square method. A capacitance component Cesc that is an impedance of 200 is calculated, and further, using the value of the capacitance component Cesc of the electrostatic chuck mechanism 200, the voltage of the substrate to be processed (estimated substrate voltage to be processed) calculated by equation (1) is calculated. Asked. With respect to the frequency domain equation (2), the voltage Vw of the substrate 102 to be processed can be estimated by decomposing the frequency component into each frequency component by Fourier series expansion, applying the equation (2) to each frequency component, and superimposing them.

図3(b)に、(1)式で計算した被処理基板の電圧(被処理基板電圧推定値)を、被処理基板の電圧の実測値と共に示す。実測値は実線で示し推測値は■で示している。   FIG. 3B shows the voltage of the substrate to be processed (estimated value of the substrate to be processed) calculated by the equation (1) together with the actual measured value of the voltage of the substrate to be processed. The actual measurement value is indicated by a solid line, and the estimated value is indicated by ■.

図3(b)に示すように、被処理基板の電圧の実測値と(1)式による被処理基板電圧推定値の波形はよく一致することが確認できた。誤差の評価方法としては、二乗誤差以外に、被処理基板電圧推定値と、被処理基板の電圧の実測値との差の絶対値の総和等、他の基準を用いても良い。   As shown in FIG. 3B, it was confirmed that the measured value of the voltage of the substrate to be processed and the waveform of the estimated voltage of the substrate to be processed according to the equation (1) matched well. As an error evaluation method, in addition to the square error, other criteria such as a sum of absolute values of differences between the estimated voltage of the substrate to be processed and the measured value of the voltage of the substrate to be processed may be used.

実験的には、測定用の被処理基板に電圧プローブを設置して構成した電圧プローブ付き被処理基板を用意して、被処理基板の電圧を直接的に測定することは可能である。しかし、通常のプラズマエッチング処理の運用時には、被処理基板毎に電圧プローブを設置することは事実上不可能なことが多い。   Experimentally, it is possible to prepare a substrate to be processed with a voltage probe configured by installing a voltage probe on a substrate to be measured, and directly measure the voltage of the substrate to be processed. However, during normal plasma etching processing, it is often impossible to install a voltage probe for each substrate to be processed.

したがって、前述の様に、あらかじめ電圧プローブ付き被処理基板から直接的に被処理基板の電圧Vwを測定して、図3(a)に示す静電チャック機構200に加えたバイアス電圧をVesc、図3(a)に示す静電チャック機構200を流れるバイアス電流をIescから、図2の静電チャック機構200の電気特性としてのインピーダンスである容量成分Cescを数値的に算出する。   Therefore, as described above, the voltage Vw of the substrate to be processed is directly measured in advance from the substrate to be processed with the voltage probe, and the bias voltage applied to the electrostatic chuck mechanism 200 shown in FIG. From the bias current flowing through the electrostatic chuck mechanism 200 shown in FIG. 3A, the capacitance component Cesc, which is the impedance as the electrical characteristic of the electrostatic chuck mechanism 200 in FIG.

そして、実際に測定しようとする被処理基板102のバイアス電圧Vescと、静電チャック機構200を流れるバイアス電流Iescと、あらかじめ取得した静電チャック機構200のインピーダンスである容量成分Cescの数値と、を用いて、(1)式に基づいて被処理基板102の電圧Vwを推定することが有効となる。ただし、バイアス電流Iescは、プラズマ生成条件によって変化する。   Then, the bias voltage Vesc of the substrate 102 to be actually measured, the bias current Iesc flowing through the electrostatic chuck mechanism 200, and the numerical value of the capacitance component Cesc that is the impedance of the electrostatic chuck mechanism 200 acquired in advance are obtained. It is effective to estimate the voltage Vw of the substrate to be processed 102 based on the equation (1). However, the bias current Iesc varies depending on the plasma generation conditions.

図2のバイアス電源117による被処理基板102の電圧により、プラズマ中のイオンを被処理基板102に引き込んで、プラズマエッチング形状の制御や、プラズマエッチング速度の制御が行われる。そのため、被処理基板102の電圧は、プラズマエッチング特性を左右する重要なパラメータの一つである。被処理基板の電圧波形をモニタすることで、プラズマエッチング特性を高精度に制御することができる。   The ions in the plasma are drawn into the substrate to be processed 102 by the voltage of the substrate to be processed 102 by the bias power source 117 of FIG. 2, and the plasma etching shape and the plasma etching rate are controlled. Therefore, the voltage of the substrate to be processed 102 is one of important parameters that influence the plasma etching characteristics. By monitoring the voltage waveform of the substrate to be processed, the plasma etching characteristics can be controlled with high accuracy.

本実施例の場合には、静電チャック機構200が容量性のインピーダンスを持っていたため、(1)式でモデル化できた。静電チャック機構200のインピーダンスが、抵抗分Resc、容量分Cesc、誘導分Lescが直列に接続された回路により表現できる場合には、(1)式相当の式として、次の(3)式を用いることができる。   In the case of this example, since the electrostatic chuck mechanism 200 has capacitive impedance, it can be modeled by equation (1). When the impedance of the electrostatic chuck mechanism 200 can be expressed by a circuit in which a resistance component Resc, a capacitance component Cesc, and an induction component Lesc are connected in series, the following equation (3) is expressed as an equation equivalent to equation (1): Can be used.

Figure 2012138581
Figure 2012138581

同様に、電圧プローブ付き被処理基板の電圧Vwを実測し、(3)式による推定値との比較から抵抗分Resc、容量分Cesc、誘導分Lescを算出して、通常の被処理基板の電圧Vwの推定値を算出することができる。また、抵抗分Resc、容量分Cesc、誘導分Lesc等を測定する別の方法として、インピーダンスアナライザにより測定する方法を取ることもできる。   Similarly, the voltage Vw of the substrate to be processed with the voltage probe is measured, and the resistance component Resc, the capacitance component Cesc, and the induction component Lesc are calculated from the comparison with the estimated value by the equation (3), and the normal processing substrate voltage An estimated value of Vw can be calculated. Further, as another method for measuring the resistance component Resc, the capacitance component Cesc, the induction component Lesc, etc., a method of measuring with an impedance analyzer can be taken.

以上説明したように、従来技術を用いたプラズマエッチング装置では、静電チャック機構200に印加するバイアス電力を所定の値に制御し、静電チャック機構に印加する電圧のピークトゥピーク電圧をモニタすることが行われてきた。前述の様にバイアス電圧の波形が正弦波でなく、複数の周波数成分を含む場合には、静電チャック機構が周波数特性をもつため、被処理基板に印加される電圧波形が歪むことになる。また、プラズマの密度が高い等の原因によりバイアス電流が大きい場合には、静電チャック機構での電圧降下を無視することになり、プラズマエッチング特性に直接影響を及ぼすと思われる被処理基板の電圧を高精度にモニタすることが困難な問題があった。プラズマエッチング特性を制御する立場からは、被処理基板に印加される電圧が直接制御されることが望ましい。   As described above, in the plasma etching apparatus using the conventional technique, the bias power applied to the electrostatic chuck mechanism 200 is controlled to a predetermined value, and the peak-to-peak voltage of the voltage applied to the electrostatic chuck mechanism is monitored. Things have been done. As described above, when the waveform of the bias voltage is not a sine wave and includes a plurality of frequency components, the voltage waveform applied to the substrate to be processed is distorted because the electrostatic chuck mechanism has frequency characteristics. In addition, when the bias current is large due to high plasma density, etc., the voltage drop in the electrostatic chuck mechanism is ignored, and the voltage of the substrate to be processed that seems to directly affect the plasma etching characteristics. There was a problem that it was difficult to monitor with high accuracy. From the standpoint of controlling the plasma etching characteristics, it is desirable to directly control the voltage applied to the substrate to be processed.

そこで、本発明では、静電チャック機構の電気的特性をあらかじめ測定しておき、実際の被処理基板の処理時の静電チャック機構の電圧、電流等を計測して、被処理基板の電圧や、電流を算出することができる。算出した被処理基板の電圧または電流をバイアス電源により制御することで上記課題は解決できる。すなわち、被処理基板のバイアス電位の制御性が良好になるので、被処理基板に対するプラズマエッチング処理の高精度化と高品質化が充分に図れる。   Therefore, in the present invention, the electrical characteristics of the electrostatic chuck mechanism are measured in advance, and the voltage and current of the electrostatic chuck mechanism during actual processing of the substrate to be processed are measured to determine the voltage of the substrate to be processed. The current can be calculated. The above problem can be solved by controlling the calculated voltage or current of the substrate to be processed by a bias power source. That is, since the controllability of the bias potential of the substrate to be processed is improved, the plasma etching process for the substrate to be processed can be sufficiently performed with high accuracy and high quality.

本発明の実施例では、上述のモニタ方法によりモニタリングされた被処理基板の電圧の大きさを指定できる制御方式とした。(1)式や(3)式を用いたモニタ方式を用いることで、プラズマの密度や状態によらず、被処理基板の電圧を安定してモニタできるので、プラズマエッチング性能の高性能化を図ることができる。   In the embodiment of the present invention, a control method is adopted in which the magnitude of the voltage of the substrate to be processed monitored by the monitoring method described above can be specified. By using the monitoring method using the equations (1) and (3), the voltage of the substrate to be processed can be stably monitored regardless of the density and state of the plasma, so that the plasma etching performance is improved. be able to.

なお、本発明は、上記実施形態に限定されるものではなく、本発明の範囲内で上記実施形態に多くの修正および変更を加え得ることは勿論である。   In addition, this invention is not limited to the said embodiment, Of course, many corrections and changes can be added to the said embodiment within the scope of the present invention.

また、本発明のプラズマ処理装置として、プラズマエッチング装置を例に挙げているが、本発明は、これに限定されるものではない。   Moreover, although the plasma etching apparatus is mentioned as an example as the plasma processing apparatus of the present invention, the present invention is not limited to this.

101:処理室
102:被処理基板
103:基板電極
107:バイアス電源(バイアス電圧印加手段)
110:シャワープレート
111:電磁波導入窓
112:アンテナ
113:同軸線路
114:自動整合機
115:高周波電源
116:自動整合機
117:バイアス電源
118:電磁石
200:静電チャック機構
201:サセプタ
202:電極カバー
203:直流電源
204:誘電体層
205:電極層
206:下地層
207:電圧モニタ(電圧計)
208:電流モニタ(電流計)
300:被処理基板電圧のサグ
301:測定記憶ユニット(インピーダンス値格納手段)
302:計算ユニット(被処理基板の電圧値を推定する手段)
303:制御ユニット
101: Processing chamber 102: Substrate 103: Substrate electrode 107: Bias power supply (bias voltage applying means)
110: Shower plate 111: Electromagnetic wave introduction window 112: Antenna 113: Coaxial line 114: Automatic matching machine 115: High frequency power supply 116: Automatic matching machine 117: Bias power supply 118: Electromagnet 200: Electrostatic chuck mechanism 201: Susceptor 202: Electrode cover 203: DC power supply 204: Dielectric layer 205: Electrode layer 206: Underlayer 207: Voltage monitor (voltmeter)
208: Current monitor (ammeter)
300: Sag of substrate voltage to be processed 301: Measurement storage unit (impedance value storage means)
302: Calculation unit (means for estimating the voltage value of the substrate to be processed)
303: Control unit

Claims (8)

被処理基板をプラズマ処理するプラズマ処理装置において、
前記被処理基板をプラズマ処理する処理室と、
前記被処理基板を静電的に吸着して保持する静電チャック機構を有する基板電極と、
前記処理室内にプラズマを発生させるプラズマ生成手段と、
前記基板電極に高周波バイアス電圧を印加する高周波バイアス電源と、
前記高周波バイアス電圧をモニタする電圧モニタと、
前記静電チャック機構に流れる高周波バイアス電流をモニタする電流モニタと、
インピーダンスアナライザを用いてそれぞれ予め算出された前記静電チャック機構の抵抗分Rescと前記静電チャック機構の誘導分Lescと前記静電チャック機構の容量成分Cescと、前記被処理基板のプラズマ処理時にそれぞれ測定される前記高周波バイアス電圧Vescと前記高周波バイアス電流Iescと、を格納する測定記憶ユニットと、
前記測定記憶ユニットに格納された前記高周波バイアス電圧Vescと前記高周波バイアス電流Iescと、前記測定記憶ユニットに格納された前記静電チャック機構の前記抵抗分Rescと前記誘導分Lescと前記容量成分Cescと、積分定数Aと、を用いて(3)式より前記被処理基板の電圧Vwを推定する計算ユニットと、
前記計算ユニットで推定された前記被処理基板の電圧Vwに基づいて、前記高周波バイアス電源の制御信号を作成し、前記制御信号を前記高周波バイアス電源に送信する制御ユニットと、を備えることを特徴とするプラズマ処理装置。
Figure 2012138581
In a plasma processing apparatus for plasma processing a substrate to be processed,
A processing chamber for plasma processing the substrate to be processed;
A substrate electrode having an electrostatic chuck mechanism for electrostatically attracting and holding the substrate to be processed;
Plasma generating means for generating plasma in the processing chamber;
A high frequency bias power source for applying a high frequency bias voltage to the substrate electrode;
A voltage monitor for monitoring the high-frequency bias voltage;
A current monitor for monitoring a high-frequency bias current flowing through the electrostatic chuck mechanism;
The resistance component Resc of the electrostatic chuck mechanism, the induction component Lesc of the electrostatic chuck mechanism, the capacitance component Cesc of the electrostatic chuck mechanism, and the substrate component to be processed, which are calculated in advance using an impedance analyzer, respectively. A measurement storage unit for storing the high-frequency bias voltage Vesc to be measured and the high-frequency bias current Iesc;
The high-frequency bias voltage Vesc and the high-frequency bias current Iesc stored in the measurement storage unit, the resistance component Resc, the induction component Lesc, and the capacitance component Cesc of the electrostatic chuck mechanism stored in the measurement storage unit. A calculation unit for estimating the voltage Vw of the substrate to be processed from the equation (3) using the integration constant A.
A control unit that generates a control signal for the high-frequency bias power source based on the voltage Vw of the substrate to be processed estimated by the calculation unit, and transmits the control signal to the high-frequency bias power source. Plasma processing equipment.
Figure 2012138581
請求項1に記載のプラズマ処理装置において、
前記Rescおよび前記Lescを0と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,
The plasma processing apparatus, wherein Resc and Lesc are set to 0.
請求項2に記載のプラズマ処理装置において、
前記(3)式を(2)式のように周波数領域で表すことを特徴とするプラズマ処理装置。
Figure 2012138581
The plasma processing apparatus according to claim 2, wherein
The plasma processing apparatus characterized in that the expression (3) is expressed in the frequency domain like the expression (2).
Figure 2012138581
請求項1に記載のプラズマ処理装置において、
前記計算ユニットで推定された前記被処理基板の電圧Vwに基づいて、前記被処理基板の電圧Vwのサグを平坦化するように前記高周波バイアス電圧の波形を制御する前記高周波バイアス電源の制御信号を作成し、前記制御信号を前記高周波バイアス電源に送信して、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,
Based on the voltage Vw of the substrate to be processed estimated by the calculation unit, a control signal of the high-frequency bias power source that controls the waveform of the high-frequency bias voltage so as to flatten the sag of the voltage Vw of the substrate to be processed. A plasma processing apparatus that creates and transmits the control signal to the high-frequency bias power source to control the high-frequency bias power source.
前記被処理基板をプラズマ処理する処理室と、
前記被処理基板を静電的に吸着して保持する静電チャック機構を有する基板電極と、
前記処理室内にプラズマを発生させるプラズマ生成手段と、
前記基板電極に高周波バイアス電圧を印加する高周波バイアス電源と、
前記高周波バイアス電圧をモニタする電圧モニタと、
前記静電チャック機構に流れる高周波バイアス電流をモニタする電流モニタと、
インピーダンスアナライザを用いてそれぞれ予め算出された前記静電チャック機構の抵抗分Rescと前記静電チャック機構の誘導分Lescと前記静電チャック機構の容量成分Cescと、前記被処理基板のプラズマ処理時にそれぞれ測定される前記高周波バイアス電圧Vescと前記高周波バイアス電流Iescと、を格納する測定記憶ユニットと、
前記測定記憶ユニットに格納された前記高周波バイアス電圧Vescと前記高周波バイアス電流Iescと、前記測定記憶ユニットに格納された前記静電チャック機構の前記抵抗分Rescと前記誘導分Lescと前記容量成分Cescと、積分定数Aと、を用いて(3)式より前記被処理基板の電圧Vwを推定する計算ユニットと、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、
前記計算ユニットで推定された前記被処理基板の電圧Vwに基づいて、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方法。
Figure 2012138581
A processing chamber for plasma processing the substrate to be processed;
A substrate electrode having an electrostatic chuck mechanism for electrostatically attracting and holding the substrate to be processed;
Plasma generating means for generating plasma in the processing chamber;
A high frequency bias power source for applying a high frequency bias voltage to the substrate electrode;
A voltage monitor for monitoring the high-frequency bias voltage;
A current monitor for monitoring a high-frequency bias current flowing through the electrostatic chuck mechanism;
The resistance component Resc of the electrostatic chuck mechanism, the induction component Lesc of the electrostatic chuck mechanism, the capacitance component Cesc of the electrostatic chuck mechanism, and the substrate component to be processed, which are calculated in advance using an impedance analyzer, respectively. A measurement storage unit for storing the high-frequency bias voltage Vesc to be measured and the high-frequency bias current Iesc;
The high-frequency bias voltage Vesc and the high-frequency bias current Iesc stored in the measurement storage unit, the resistance component Resc, the induction component Lesc, and the capacitance component Cesc of the electrostatic chuck mechanism stored in the measurement storage unit. In the plasma processing method of performing plasma processing on the substrate to be processed using a plasma processing apparatus comprising a calculation unit that estimates the voltage Vw of the substrate to be processed from the equation (3) using the integration constant A.
A plasma processing method comprising controlling the high-frequency bias power source based on a voltage Vw of the substrate to be processed estimated by the calculation unit.
Figure 2012138581
請求項5に記載のプラズマ処理方法において、
前記Rescおよび前記Lescを0とすることを特徴とするプラズマ処理方法。
In the plasma processing method of Claim 5,
The plasma processing method, wherein the Resc and the Lesc are set to 0.
請求項6に記載のプラズマ処理方法において、
前記(3)式を(2)式のように周波数領域で表すことを特徴とするプラズマ処理方法。
Figure 2012138581
The plasma processing method according to claim 6, wherein
The plasma processing method characterized in that the expression (3) is expressed in the frequency domain like the expression (2).
Figure 2012138581
請求項5に記載のプラズマ処理方法において、
前記計算ユニットで推定された前記被処理基板の電圧Vwに基づいて、前記被処理基板の電圧Vwのサグを平坦化するように前記高周波バイアス電圧の波形を制御する前記高周波バイアス電源の制御信号を作成し、前記制御信号を前記高周波バイアス電源に送信して、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方法。
In the plasma processing method of Claim 5,
Based on the voltage Vw of the substrate to be processed estimated by the calculation unit, a control signal of the high-frequency bias power source that controls the waveform of the high-frequency bias voltage so as to flatten the sag of the voltage Vw of the substrate to be processed. A plasma processing method comprising: generating and transmitting the control signal to the high frequency bias power source to control the high frequency bias power source.
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