Solid Immersion and Evanescent Wave Lithography at Numerical Apertures > 1.60
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1 Solid Immersion and Evanescent Wave Lithography at Numerical Apertures > 1.60 Bruce Smith Y. Fan, J. Zhou, L. Zavyalova, M. Slocum, J. Park, A. Bourov, E. Piscani, N. Lafferty, A. Estroff Rochester Institute of Technology
2 Outline The imaging limits of materials Pushing the limits of immersion lithography The solid immersion lens Solid immersion lithography (SIL) Evanescent wave lithography (EWL) Imaging 6nm at 1.85NA
3 Material and Optical Limitations NA = n i sin θ 1. Sin θ increases slowly at large angles (sin 68 =0.93). Hyper-NA will be forced upon material refractive index 3. Resolution will become a function of the lowest index (fluid, optics, photoresist). glass media photoresist substrate hp k1λ n sinθ (0.5 to 0.30)(193nm) n (0.93) min = = = i i 5 n i to 6 n i nm
4 Technology Limits in Media TIR from Snells Law: θ c = sin -1 (n L /n H ) 100 SIL (1.56) HIF (1.54) Air (1.00) H 0 (1.44) SIL (1.70) Air (1.00) H HIF 0 (1.44) (1.54) θ c = sin -1 (n L /n H ) Reflectance TE TM Reflectance TE TM Angle (degrees) Angle (degrees) Fused silica (n=1.56) Sapphire (n=1.9)
5 Technology Limits in Media Numerical Aperture Half-Pitch (nm) k1= k1= Angle in media Water (1.44) HIF (1.55) HIF (1.65) Photoresist (1.70) HI PR (1.85) Fused silica (1.54) Sapphire (1.9) TIR
6 Impact of Angle in Photoresist Simple Approximations Unpolarized modulation Polarization and absorption Modulation 1 cos θ Absorption Absorption scaling DOF scaling Depth of focus 1 sin θ NA 1.0NA Angle in resist (degrees) NA 1.0NA Angle in resist (degrees) Oblique absorption requires low k photoresist Paraxial DOF scales with 1/sin (θ) Angles above 30 (0.85 NA) require attention Oblique reflection becomes an issue > 30
7 A Solid Immersion Lens - A high index solid immersion lens is placed in close proximity to an image plane - Dry imaging for NA values > Used in optical storage applications - Energy coupled into the thin film decays exponentially: A( z) = e πn upper λ sin n θ n lower upper 1 / + α z n upper = lens n lower = air z = gap
8 Solid Immersion Lithography Sapphire SIL Breadboard Sapphire Properties: - Hexagonal, single-crystalline Al O 3 - n = 1.9, birefringence ~8x Equilateral prism at 60 is 1.67NA - Designed for NA 1.05~1.9 - MgF is ideal AR layer Sapphire prism Turning mirrors prism cylinder Zero-order block Challenges: - Gap and gap control - Birefringence - CAR resist diffusion length limit - Resist/BARC process optimization Grating mask Polarized ArF beam
9 Optical Coupling in the Prism Laser Detector Laser Detector (a) Baseline (no wafer). (b) Reflection (with wafer). (a) Before pressure is applied. (b) After pressure is applied.
10 Estimation of Gap Thickness - Reflectance measurement used to estimate gap thickness. - Gap controllable from 0-50nm - 1nm air gap utilized. Reflectance NA=1.66 Theoretical Measurement Immersion solid (sapphire), N 0 =1.9 Air gap, N 1 =1.00, d 1 =0~50 nm Resist, N = i, d =78 nm BARC, N= i, 9 nm Substrate N sub = i Air gap thickness (nm) Resist assembly
11 Solid Immersion Lithography at the Resist Limit 1.4NA, 34nm 1.60NA, 30nm 1.66NA, 9nm ILSim simulations
12 Beyond the Resist Limit Evanescent Wave Coupling n upper sinθ = NA max Homogeneous propagation θ c Evanescent region n lower sinθ Evanescent region thin film higher n n upper -hi n lower -low Homogeneous propagation NA = n i sinθ Energy coupled into the thin film decays exponentially: A(z) = e πn λ upper sin n θ n lower upper 1 / +α z
13 Evanescent Wave Lithography Beyond the Resist Limit - 6nm hp at 1.85NA NA (1.85) has been pushed higher than the index of the resist (1.70). Image pattern depth of <10 nm. Sets the stage for new material development toward 5nm. Potential with TSI and hardmask imaging layers. 1.85NA, 6nm
14 Gap Requirements / Tolerances Assume 50% intensity loss across the image no loss in modulation 1% gap results in ~0.5-1% intensity at 1.70NA dose control issue Gap (nm) for 50% intensity nm hp at 64 in sapphire A(z) = e Water πn λ upper HIF Gap Index sin Gap (nm) for 50% intensity n θ n Numerical Aperture lower upper 1 / 8nm hp HIF gap for 0.5k1 +α z 7nm hp
15 Implications of SIL and Evanescent Wave Lithography 1. SIL / EWL is useful for determining the ultimate limits of optical lithography in the 5nm regime.. NA possible beyond the fluid index. 3. Higher index photoresists may not be necessary if topsurface imaging (TSI) can be employed. 4. SIL may be feasible if small fluid gaps can be maintained.
16 Technology Limits in Media Numerical Aperture Half-Pitch (nm) k1= k1= Angle in media Water (1.44) HIF (1.55) HIF (1.65) Photoresist (1.70) HI PR (1.85) Fused silica (1.54) Sapphire (1.9) Can be achieved with immersion lithography May be possible with SIL / EWL Not likely Acknowledgements SRC, DARPA/AFRL, Sematech, ASML, Photronics, TOK, JSR, Rohm and Haas, Brewer, NYSTAR, Corning Tropel
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