EUVL Development in JAPAN
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1 EUVL Workshop 2010, June24, Maui EUVL Development in JAPAN ~ Challenge, Idea, and Latest Achievement ~ Iwao Nishiyama 1
2 EUVL Development in Japan Light Source Exposure Tool Metrology Mask & Resist Integration ASET EUV Basic Technologies Supported by NEDO ASET Wavefront measurement Mask blank inspection Supported by NEDO Leading Project (LPP source) Supported by MEXT EUVA Source Pj Supported by NED EUVA Tool Pj Supported by NEDO Mask/Resist Process (R&D by companies) Resist Supported by NEDO SFET Tool Development(R&D by company) EUV1 Wavefront measurement Wavefront measurement Supported by NEDO R&D by company High Reliability Source Supported by NEDO High Power Source R & D by company Mask Supported by NEDO Lithography/Mask R&D by company National Foundation Company Pj 2
3 Source 3
4 First proposal of Tin Target G.O Sullivan and P.K.Carroll J. Opt. Soc. Am. 71 (1981) 227 4d-4f narrow band emission 50 Sn neutral absorption 13.5 nm 54 Xe Tomie, EUVL Workshop 2000 (San Francisco) High CE of Tin target was firstly proposed. Tanuma, EUVL Symposium 2006 (Barcelona) Charge selective spectra were directly measured. Tokyo metropolitan University 4
5 Conversion efficiency of CO2 LPP vs YAG LPP Conversion Efficiency [arb. Units] CO 2 LPP vs YAG LPP Laser Intensity [W/cm 2 ] Okada, Jpn. J. Appl. Phys. (2004) L585 Tanaka, Appl. Phys. Lett. 87 (2005) Electron Temperature [ev] Density-temperature map of 13.5-nm EUV conversion efficiency 4% 3% 2% 1% Ion density [/cm 3 ] Laser Intensity [W/cm 2 ] W/cm 2 1μm CE=1.43% W/cm μm CE=2.22% K. Nishihara, EUVL Symposium 2004 (Miyazaki) Feasibility of CO2 laser driven LPP was firstly demonstrated. 5
6 6
7 7
8 Optics 8
9 Metrology for aspherical mirror Visible PDI for High Accuracy High precision interferometer for production PDI: Point diffraction interferometer K. Ota, Proc. SPIE 4343 (2001) 543 (nm rms) Reproducibilit y measured (05/03/23) measured (05/05/25) Accumulation number Target: 0.05nm rms New-concept interferometers were developed for λ/30 projection optics 9
10 At-wavelength wave-front metrology of optics Purpose:Development of standard for WFE metrology 3 m in Diameter, 20 ton in Weight EUV Illumination PDI LSI Gratings Test Optics Projection 1000mm 30mm First Pin-hole 650nm PDI 干渉像 Vacuum Pump Camera Schematic View of 6 Mirror System The System was installed at Hyogo Pref. Univ. Accuracy of 0.1nm rms was achieved Large Window and 2nd Pinhole of 50-80nm Interference fringes obtained by PDI 10
11 Tool 11
12 1986 NTT EUVL Tool development in Japan - Small Field Tool SORTEC 50 nm hp 5X, 8X Schwartz Child, 11nm/12.4 nm H. Kinoshita, Proc. Fall Mtg. Jpn Soc. Appl. Phys. (1986) H. Kinoshita, J. Vac. Sci. Technol. B7(1989) ASET(HiNA) Nikon 32X Schwartz Child, 13 nm / 4.5 nm H. Oizumi, 1993 Jpn J Appl. Phys. 32 (1993) 5914 H. Nagata, Jpn. J. Appl. Phys. 33 (1994) L Selete(SFET) Exposure chamber Canon Source (Xe DPP) In-line 5X NA0.32 T. Oshino, Proc. SPIE 5037 (2003) 75 H. Oizumi, Proc. SPIE 5751 (2005) 102 5X NA0.32 H. Tanaka, EUVL Symposium 2007 (Sapporo) K. Tawarayama, Jap. J. Appl. Phys. 47 (2008)
13 EUVL Tool development in Japan -Full Field Tool HIT(ETS) 2008 Nikon-Selete(EUV1) Vacuum chamber Optics housing W & M alignment system Mask M1 M3 M2 Optical Bbase a P laplate Wafer Vibration Isolation Bench 5X, NA 0.1, SR Source 3 aspheric mirror system 4X, NA 0.25, Xe-DPP 6 aspheric mirror system T. Watanabe, Jpn. J. Appl. Phys. 36 (1997) 7597 I. Mori, Proc. SPIE 6921 (2008)
14 Mask 14
15 EUV Mask Development in Selete Mask Infrastructure Particle free mask handling Actinic Blank Inspection EUV 13.5 nm Pattern Inspection DUV 199 nm Pattern Repair FIB Double pod MPE-tool Blank Inspection M defects/transfer 0.002particlse/transfer Mask pattern Printed Image Mask defect printability Phase defect Pattern Defect Defect repair Semi standardization of double pod Contamination control シリカ系 H C H O H CH O H O Si H CH Si O C C CH 2 水素率高 C CH C H C C CH CH H C C CH CH CH CH C C C C CH H 重量密度低 CH O C CH O CH C H Si H CH O H 2 C 不飽和芳香族鎖状コンタミネーション膜 C O OH C SiH C C CH CH CH C C C 炭素率高 H C CH C C CH C C C CH 黒鉛化率低 O C CH C O CC CH CH CH C C CH C C H 重量密度高 O C C C Si O Si H Si O O O Si C Si O Si キャップ層 Si Si Si O Si Si O Si O O O OSi 自然酸化膜 Model コンタミ薄膜のモデル例 of carbon contamination Carbon analysis Printability Cleaning Resist outgas 15
16 Sensitivity of Pattern defect inspection Low reflectivity absorber(r4%) Allowable defect size(10 % CD change) Base pattern hp32nm hp128nm (hp128nm) hp27nm hp108nm (hp108nm) hp22nm hp88nm (hp88nm) Defect type Edge extrusion extension Edge intrusion intrusion Edge extrusion extension Edge intrusion Edge extrusion extension Edge intrusion Illumination C-pol. P-pol. C-pol. P-pol. C-pol. P-pol. C-pol. P-pol. C-pol. P-pol. C-pol. P-pol. Defect size [nm] (Square root of area) Defect size:35nm LR absorber (R4% R4%) ML (Mo/Si 40pairs) Substrate *LR= Low Reflectivity LR*- TaSi (51nm) CrN buffer (10 nm) Si cap hp32nm hp32nm (128nm@mask) (128nm@mask) Both Both of of c- c- and and P- P- polarizations polarizations have have enough enough sensitivity sensitivity hp27nm hp27nm (108nm@mask) (108nm@mask) p-polarization p-polarization has has enough enough sensitivity sensitivity hp22nm hp22nm (( 88nm@mask) 88nm@mask) p-polarization p-polarization has has potential potential for for hp22nm hp22nm application, application, but but further further improvement improvement is is needed needed Defect size:41nm 16
17 Defect printability test by programmed Defect Multi-shot images ware averaged to reduce resist LER Mask Defect Exposure Shot1 Shot2 Printed images Shot7 Hp32 Hp32 nm(7 nm(7 shots shots averaging) averaging) average (Edge intrusion) Comparison between Simulation and Printed CD change Space Width [nm] Edge Opaque Defect Simulation Measured Defect Size (1x) [nm] Line Width [nm] Edge Clear Defect Simulation Measured Defect Size (1x) [nm] Using the CD Averaging Method, simulated results were verified by actual PD printing test. 17
18 Actinic Blank Inspection POC tool (MIRAI I and II) (Top view) Full-field Inspection tool (Front view) YAG Laser 532nm, 10Hz Collector Mirror 6025 Mask Blank Zr Filter EUV LD Tape target Schwarzschild Optics (20x or 26x, NA=0.2) PC Ellipsoidal Mirror Incident EUV light Scattered EUV light CCD camera Zr Filter EUV light source (DPP, 1.9 khz) Illumination optics Vibration isolator CCD camera Schwarzschild optics (26X) 6025 Mask blank Mask stage In house LPP EUV light source (10 Hz) Mask stage stroke: X,Y: 10 mm,2 mm (Manual operation) Static imaging mode Commercial available EUV source (1.9 khz) Mask stage stroke: X,Y: 169 mm,169 mm (Automatic controlled) TDI mode & Static imaging mode 18
19 Detection probability improvement 1Q Q Q 2010 One FOV (0.5mm sq.) Full-field of mask blank Threshold Noise Filter Defect capture rate (%) false defect Defect volume (nm 3 ) 80,000 false defects 0 1 false defect 1 false defect Defect volume (nm 3 ) Defect volume (nm 3 ) 19
20 Multilayer phase defect Height 2.5 nm Defect Map of Multilayered Blank Substrate width Multilayer A Wx:108nm, Wy:102nm, H:1.9nm D Wx:40nm, Wy:43nm, H: 1.8nm E nmh, 60 nmw 20 Wx:19nm, Wy:20nm, H: 1.1nm Detection of Programmed defects 0 22nm 32nm C Rank 12 Defect signal intensity Rank 11 Rank 10 Rank 9 Rank 8 Rank 7 Rank 6 Rank 5 Rank 4 Rank 3 Rank 2 Rank Frequency Critical for hp 32 nm Critical for hp 22 nm Defects critical for hp 32 nm Defects critical for hp 22 nm Wx:28nm, Wy:16nm, H: 2.8nm 20
21 Resist 21
22 Change of resist chemistry by excitation energy Absorption cross section(10-18 cm 2 ) Absorption spectra of simple organic molecule DUV METHANE 2ETHANE 3 PROPANE 4BUTANE PHOTON ENERGY(eV) DUV resist EUV resist Transmittance is a key factor for DUV lithography. ( nm) Reaction occurs by electronic excitation ( Photochemistry) EUV All DUV and EB resists technologies can be used for EUV lithography Reaction occurs by ionization of molecules (radiation chemistry) 22
23 S. Tagawa et. al. SPIE 3999 (2000)
24 Pattern Collapse Improvement by New Developer Short-range LWR: 3σ(nm) at hp32nm HO SSR3 SSR4+Process 5.0 SSR4 N SSR E size of hp32nm (mj/cm 2 ) Sensitivity - LWR TMAH 0.26N (Tetramethyl Ammonium Hydrooxide) - hp 26 nm hp 25 nm hp 24 nm Swelling Resolution limit (nm) Pattern collapse SSR4 SSR3 SSR4+Process SSR2 New Developer TBAH 0.26N (Tetrabutyl Ammonium Hydrooxide) N + HO E size of hp32nm (mj/cm 2 ) Sensitivity - Resolution 24
25 Latest performance of EUV resist hp 28 nm hp 26 nm hp 24 nm hp 22 nm hp 21 nm hp 20 nm SSR4 Dose: 11.9mJ/cm 2 LWR: 7.2nm hp 19 nm SMR569 Dose: 16.0mJ/cm 2 LWR: 5.4nm SFET NA0.3 Illumination: X-slit 50nm Thick. Developer: TBAH 25
26 Molecular Resist(Fullaren derivatives) M100 Protecting group: bulky ester SMR567 based on M100 M100 bulky E/BBI nf 30wt%/TOA 3wt% Substrate: under layer F (UL F) 20nm Film thickness: 50nm SFET (x slit) PAB 110 /PEB 110 Dev.: TMAH 0.26N 30 sec SMR567 Dose(mJ/cm 2 ): LWR(nm): hp 26 nm SMR601 Dose(mJ/cm 2 ): LWR(nm): hp 25 nm SMR567: 保護基の最適化 SMR601: 保護比率の増加 Litho-pattern Resist(60nm t ) /UL(20nm t ) After Etching Resist(60nm t ) /UL(20nm t ) /Poly-Si(50nm t ) /SiO 2 (4nm t )/Si Cross sectiona view befere/after etching(smr ) hp 32 nm hp 28 nm hp 26 nm Normarized Etch-rate Etcher: U 8150 (Hitachi) Condition :Cl 2, 0.4Pa, 500W 1.00 ArF resist (dry) 0.81 SMR377 (PHS-tBOC) 0.53 MET-2D 0.37 SMR567 (Fullerene) 26
27 Full Field Exposure 27
28 hp 28 nm 35 nm ホール Performance of EUV1 (1) CD accuracy In-field homogenuity Mean = 29.5 nm 3σ = 3.7 nm 16.7 mm 22.1 mm Mean = 37.0 nm 3σ = 3.3 nm Frequency Frequency Overlay accuracy Via 1 to Metal 1 Overlay accuracy from V1 to M1 (nm) Metal 2 to Via Overlay accuracy from M2 to V1 (nm) X Y x y Mean σ (nm) X Y x y Mean σ (nm) 28
29 Performance of EUV1 (2) Resolution performance by dipole illumination 26mm σ=0.8 σ=0.4 SSR4: 45 nm thick Dose: 11 mj/cm 2 29
30 Yield improvement of hp 3X nm PL-TEG 100% 80% 43 nm hp 38 nm hp 35 nm hp 1 st RUN ( 09/1) tiny bridge SSR3 Yield Yield was was improved improved by by resist resist performance performance Yield [%] 60% 40% collapse 20% SMR73 0% length [mm] 100% 2 nd RUN ( 09/6) SSR4 80% Yield [%] 60% 40% 43 nm hp 38 nm hp 35 nm hp 3 rd RUN ( 09/10) HP vs. Yield (V line 0.7 mm) 20% 100% 100% Yield [%] 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 55 1st Run 2nd Run 3rd Run HP [nm] % 80% length [mm] 60% Yield [%] 40% 43 nm hp 20% 38 nm hp 35 nm hp 0% 32 nm hp length [mm] 30
31 Summary History of Japan EUVL development was reviewed. Source power is approaching 100 W level based on understanding of plasma physics under the collaboration with university and national laboratories. Wavefront error of optics is drastically improved by introduction of new metrology techniques in this decade, and become to satisfy the requirement to pre-production exposure tool. EUV1 shows resolution of 22 nm hp with dipole illumination. Mask infrastructure is now developing at Selete. Signal to noise ratio of actinic blank inspection tool (ABI) is improved. We applied ABI tool to whole-area bank inspection, and successfully demonstrated the sensitivity as small to 1.1nmH and 20nmW defect. DUV (199 nm)-based pattern inspection technique is applicable to hp 2X by using polarized illumination and low reflectance absorber material. Defect printability are studied using above infrastructures and calculation. Resist performance has improved steady based on the improvement of materials and processing technologies. We are now developing the α-stage EUVL processing, and will be transferred to β-stage processing in next phase and also manufacturing in company. We are now developing BEOL-TEG(hp35nm) process, and PL-TEG(hp3Xnm and hp2xnm) process. We learn the issues for high volume production. 31
32 Acknowledgement A part of technologies shown in this presentation are developed by the support of NEDO (New Energy and Industrial Technology Development Organization) under the management of METI (Ministry of Economy, Trade and Industry). The author thanks to all co-workers for assistance of presentation. 32
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