Ultra line narrowed injection lock laser light source for hyper NA ArF immersion lithography tool
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1 Ultra line narrowed injection lock laser light source for hyper NA ArF immersion lithography tool Toru Suzuki*, Kouji Kakizaki**, Takashi Matsunaga*, Satoshi Tanaka**, Yasufumi Kawasuji*, Masashi Shimbori**, Masaya Yoshino**, Takahito Kumazaki*, Hiroshi Umeda*, Hitoshi Nagano**, Shinji Nagai*, Youichi Sasaki** and Hakaru Mizoguchi*** * Komatsu Ltd., ** Ushio Inc., ***Gigaphoton Inc.
2 Outline 1. Introduction - laser spectrum spec - CD error sensitivity for E95 - E95 adjustability 2. Narrower spectrum for Hyper NA lithography - High resolution Line narrowing module (LNM) - E95 fluctuation caused by acoustic wave 3. Stable spectrum for critical process - Improved thermal design of LNM -BCM 4. Conclusion Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
3 1. Introduction 1.1 E95 spec for hyper NA immersion lithography E95[pm] GT40A refractive lens system GT60A catadioptric lens system GT61A % improvement! E95 < 0.35pm required for hyper NA lithography NA Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
4 1.2 CD error sensitivity for E95 (1) Simulation conditions 1D Binary Contact hole A = nm B = 10 * A Illumination: quadrupole sigma 0.8/0.15 NA: 1.3 immersion Wavelength: 193nm E95: 0.35pm & 0.50pm Resist thickness: 165nm Simulator: prolith v9.3 A B Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
5 1.2 CD error sensitivity for E95 (2) Simulation results CD sensitivity [nm/(0.1pm)] >3nm CD change is induced by 0.1 pm E95 change E95=0.35pm E95=0.50pm Hole size [nm] Critical process need stable spectrum de95 < 0.1pm design target introduce Bandwidth Control Module (BCM) Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
6 1.3 E95 adjustability E95[pm] Before adjustment A B C D E F G H Laser Tool to tool differences at shipping & after replacement of modules Conventional data de95 < 0.15pm Need E95 adjustments for the exact replication of the process E95[pm] After adjustment A B C D E F G H Laser Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
7 2. Narrower spectrum for Hyper NA lithography E95 <0.35pm High resolution Line narrowing module (LNM) E95 fluctuation caused by acoustic wave 3. Stable spectrum for critical process de95 < 0.1pm Improved thermal stabilization design of LNM BCM No tool to tool spectrum differences for replication of the process E95 stabilization by feedback system Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
8 2. Narrower spectrum for Hyper NA lithography E95 <0.35pm High resolution Line narrowing module (LNM) E95 fluctuation caused by acoustic wave 3. Stable spectrum for critical process de95 < 0.1pm Improved thermal stabilization design of LNM BCM No tool to tool spectrum differences for replication of the process E95 stabilization by feedback system Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
9 2-1 High resolution line narrowing module High resolution grating Laser chamber Prism Output coupler Suppress acoustic wave effect New thermal design Diffraction grating Line narrowing module (LNM) Monocrometer: λ resolution : = dλ 1 million Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
10 Typical spectrum profile of new LNM Intensity GT61A GT60A relative wavelength [pm] Modified Lorenzian n=3 n c f ( λ) = n n c + (2λ) GT60A GT61A E pm 0.25pm Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
11 2-2 E95 fluctuation caused by acoustic wave Suppress the acoustic wave effect in the chamber Acoustic wave Need to reduce acoustic wave affection to discharge Power supply increase the capacity Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
12 Repetition rate dependency of E Band width [pm] FWHM(pm) E95(pm) Rep. rate (Hz) No remarkable peak for all frequency Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
13 2. Narrower spectrum for Hyper NA lithography E95 <0.35pm High resolution Line narrowing module (LNM) E95 fluctuation caused by acoustic wave 3. Stable spectrum for critical process de95 < 0.1pm Improved thermal design of LNM BCM No tool to tool spectrum differences for replication of the process E95 stabilization by feedback system Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
14 1) New thermal design of LNM Improved thermal stabilization design Spectrum E95 [pm] LNM with large heat effect New design LNM time [min] E95 [pm] time [s] Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
15 2) E95 feedback control system BCM (bandwidth control module) System schematics High accuracy thermal control Airtight chamber E95 Monitor Deconvolution processor (DSPx2) BCM Controller Optical fiber Illumination optics GT40/60A Laser High finesse Etalon High resolution imaging optics Low noise VUV detective CCD sensor CCD driver Main processor (SH) E95 Control Module AMP CHB MM Laser Controller actuator OSC CHB LNM Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
16 3) Bandwidth control module feature Grating Laser light Optics Wave front No change Spectrum λ1 λ1 λ1 Narrow λ1 Optics Wave front change Grating Laser light λ2 Spectrum λ1 λ3 Broad λ2 λ1 λ3 Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
17 1) spectrum profile stability FWHM[pm] E95[pm] E95/FWHM Intensity 27kV 0.75pm 0.50pm 0.35pm Δλ [pm] BCM (bandwidth control module) enables to adjust the spectrum bandwidth No spectrum profile change by adjusting E95 Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
18 2) Laser performance stability wavelength sigma max[pm] E95=0.30pm E95=0.45pm Output Power [W] Dose error[%] pm 0.45pm Output power[w] Wavelength and dose performance do not change by adjusting E95 Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
19 3) E95 feedback control performances (1) a) Short term (4sec) : die to die Target E95 = 0.3pm E95 [pm] E95 [pm] Time [sec] Target E95 = 0.6pm w/o control w/ control w/o control w/ control Time [s] Variation (Peak to Valley) w/ control 0.02pm w/o control 0.03pm Variation (Peak to Valley) w/ control 0.03pm w/o control 0.05pm Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
20 3) E95 feedback control performances (2) b) Middle term (30min) : wafer to wafer Target E95 = 0.4pm E95 [pm] Low duty High duty Low duty w/o control w/ control Time [min] Variation (Peak to Valley) w/ control 0.03pm w/o control 0.13pm Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
21 3) E95 feedback control performances (3) c) Long term (3 days) : lot to lot E95[pm] Mpls Duty[%] Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
22 3. Conclusion 1) CD error, properly related to laser spectrum for Hyper NA (>1.3) immersion lens, is characterized by numerical simulations. 2) We decide the tight E95 and de95 design target. We innovated new line narrowing module, chamber and BCM to achieve the tight target. 3) New line narrowing module achieved E95 < 0.35pm. 4) New Bandwidth Control Module (BCM) makes stable E95 (de95 < 0.1pm) which is required for critical process. 5) Adjustable E95 enables exact replication of the process. 6) ArF light source GT61A for Hyper NA immersion lithography is successfully developed. Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
23 Copyright 2007 GIGAPHOTON INC. all rights reserved. SPIE /22
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