JP7284746B2 - X線依拠計量用高輝度クリーンx線源 - Google Patents
X線依拠計量用高輝度クリーンx線源 Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G2/00—Apparatus or processes specially adapted for producing X-rays, not involving X-ray tubes, e.g. involving generation of a plasma
- H05G2/001—X-ray radiation generated from plasma
- H05G2/003—X-ray radiation generated from plasma being produced from a liquid or gas
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
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- G01N23/201—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials by measuring small-angle scattering
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- H05G2/001—X-ray radiation generated from plasma
- H05G2/003—X-ray radiation generated from plasma being produced from a liquid or gas
- H05G2/006—X-ray radiation generated from plasma being produced from a liquid or gas details of the ejection system, e.g. constructional details of the nozzle
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Description
る。図1に示した実施形態では情報処理システム130がビームコントローラとして構成されており、それを動作させることで何らかの照明特性、例えば入射照明ビーム124の強度、発散、スポットサイズ、偏向、スペクトル及び位置決めを制御することができる。
Claims (15)
- レーザ生成プラズマ光源であって、
プラズマチャンバ内にキセノンガス流があり、キセノンガスの圧力が5Torr~200Torr域内であるプラズマチャンバと、
固体又は液体のキセノンターゲット列をそのプラズマチャンバ内のターゲット個所に供給するキセノンターゲット発生器と、
前記プラズマチャンバ内の前記ターゲット個所へと向かう励起光パルス列を生成する1個又は複数個のパルスレーザ光源と、
前記プラズマチャンバからキセノンガス塊を回収し、回収されたキセノンガスの第1塊を前記キセノンターゲット発生器に供給し、回収されたキセノンガスの第2塊を前記プラズマチャンバに供給するよう構成された、ガス再循環システムと、
を備え、その励起光パルス列を構成するパルスそれぞれが2p秒未満の持続時間を有し、その励起光パルス列を構成するパルスと前記キセノンターゲット列のうち対応するキセノンターゲットとの相互作用によりそのキセノンターゲットがイオン化してプラズマが形成され、そのプラズマにより放射されるX線照明光塊が25000eV~30000eV域内のエネルギを有し、そのX線照明光を用い計測下半導体試料を照明しうるレーザ生成プラズマ光源。 - 請求項1に記載のレーザ生成プラズマ光源であって、前記キセノンターゲット発生器が、
固体又は液体のキセノンドロップレット列を前記プラズマチャンバ内に吐出するドロップレット発生器を備えるレーザ生成プラズマ光源。 - 請求項1に記載のレーザ生成プラズマ光源であって、前記キセノンターゲット発生器が、
前記プラズマチャンバ内に配置された極低温冷却ドラムを備え、その極低温冷却ドラムがキセノン素材固体層を有し、その層が極低温冷却ドラムの外向き面上、各励起光パルスの焦点に配置されているレーザ生成プラズマ光源。 - 請求項1に記載のレーザ生成プラズマ光源であって、前記1個又は複数個のパルスレーザ光源に、励起光パルスを同時に放射する少なくとも2個のパルスレーザ光源が含まれるレーザ生成プラズマ光源。
- 請求項1に記載のレーザ生成プラズマ光源であって、前記1個又は複数個のパルスレーザ光源に、励起光パルスを順次放射する少なくとも2個のパルスレーザ光源が含まれるレーザ生成プラズマ光源。
- 請求項1に記載のレーザ生成プラズマ光源であって、前記回収されたキセノンガスの第1塊に、気化したキセノンターゲット素材塊が含まれるレーザ生成プラズマ光源。
- 請求項1に記載のレーザ生成プラズマ光源であって、前記プラズマチャンバの窓から前記プラズマまでの距離が少なくとも10cmあるレーザ生成プラズマ光源。
- 請求項1に記載のレーザ生成プラズマ光源であって、前記列をなすキセノンのドロップレットそれぞれが直径50μm未満であるレーザ生成プラズマ光源。
- 請求項1に記載のレーザ生成プラズマ光源であって、前記プラズマの輝度が1014光子/(秒・mm2・mrad2)超であるレーザ生成プラズマ光源。
- 請求項1に記載のレーザ生成プラズマ光源であって、更に、
前記プラズマにより放射された照明光塊を集めその照明光塊を前記プラズマチャンバのX線窓内に差し向ける集光器を備えるレーザ生成プラズマ光源。 - 計量システムであって、
レーザ生成プラズマ光源であり、
プラズマチャンバ内にキセノンガス流があるプラズマチャンバ、
固体又は液体のキセノンターゲット列をそのプラズマチャンバ内のターゲット個所に供給するキセノンターゲット発生器、
前記プラズマチャンバ内の前記ターゲット個所へと向かう励起光パルス列を生成する1個又は複数個のパルスレーザ光源であり、その励起光パルス列を構成するパルスそれぞれが2p秒未満の持続時間を有し、その励起光パルス列を構成するパルスと前記キセノンターゲット列のうち対応するキセノンターゲットとの相互作用によりそのキセノンターゲットがイオン化してプラズマが形成され、そのプラズマにより放射されるX線照明光塊が25000eV~30000eV域内のエネルギを有する、1個又は複数個のパルスレーザ光源、
前記プラズマチャンバからキセノンガス塊を回収し、回収されたキセノンガスの第1塊を前記キセノンターゲット発生器に供給し、回収されたキセノンガスの第2塊を前記プラズマチャンバに供給するよう構成された、ガス再循環システム
並びに
そのプラズマにより放射されたX線照明光を集めそのX線照明光を計測下試料に差し向ける集光器、
を備えるレーザ生成プラズマ光源と、
前記試料上に前記X線照明光が入射するのに応じその試料から散乱されてくるX線輻射塊を検出するX線検出器と、
検出されたX線輻射塊に基づきその試料のモデルに係る注目パラメタの値を決定するよう構成された情報処理システムと、
を備える計量システム。 - 請求項11に記載の計量システムであって、何らかの透過型小角X線スキャタロメトリシステムとして構成されている計量システム。
- 請求項11に記載の計量システムであって、前記プラズマチャンバの窓から前記プラズマまでの距離が少なくとも10cmある計量システム。
- 請求項11に記載の計量システムであって、前記プラズマチャンバ内におけるキセノンガスの圧力が5Torr~200Torr域内である計量システム。
- プラズマチャンバ内にキセノンガス流を準備するステップと、
固体又は液体のキセノンターゲット列をそのプラズマチャンバ内のターゲット個所に供給するステップと、
そのプラズマチャンバ内の前記ターゲット個所へと向かう励起光パルス列でありその励起光パルス列を構成するパルスそれぞれが2p秒未満の持続時間を有するものを生成し、その励起光パルス列を構成するパルスと前記キセノンターゲット列のうち対応するキセノンターゲットとの相互作用によりそのキセノンターゲットをイオン化させてプラズマを形成し、そのプラズマが放射するX線照明光塊であり25000eV~30000eV域内のエネルギを有するものを用いて計測下半導体試料を照明するステップと、
そのX線照明光に応じその試料から散乱されてくるX線輻射塊を検出するステップと、
検出されたX線輻射塊に基づきその計測下試料の少なくとも1個の注目パラメタの値を決定するステップと、
を有し、更に、
前記プラズマチャンバからキセノンガス塊を回収するステップと、
回収されたキセノンガスの第1塊を、前記キセノンターゲット列を供給するキセノンターゲット発生器に供給し、回収されたキセノンガスの第2塊を前記プラズマチャンバに供給するステップと、
を有する方法。
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US16/112,762 US11317500B2 (en) | 2017-08-30 | 2018-08-26 | Bright and clean x-ray source for x-ray based metrology |
US16/112,762 | 2018-08-26 | ||
PCT/US2018/048530 WO2019046417A1 (en) | 2017-08-30 | 2018-08-29 | X-RAY SOURCE LUMINOUS AND CLEAN FOR X-RAY METROLOGY |
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