EUVL Exposure Tools for HVM: It s Under (and About) Control
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1 EUVL Exposure Tools for HVM: It s Under (and About) Control Wim van der Zande ASML Director, Research EUV Litho Workshop Amsterdam November 2016
2 ASML at a EUV Source Workshop Slide 2 The position of EUV for continuation of advanced lithography solutions: More than simply shrink EUV Installed base performance: Imaging, overlay, defectivity: status and implication EUV source architecture, performance and power scaling: The beauty of the ASML EUV Source Summary
3 Acknowledgements: Igor Fomenkov, David Brandt, Daniel Brown, Rob Rafac, Alexander Schafgans, Yezheng Tao, Michael Purvis, Alex Ershov, Georgiy Vaschenko, Slava Rokitski, Michael Kats, Daniel Riggs, Wayne Dunstan, Michael Varga, Mathew Abraham, Matthew Graham, Slide 3 Cymer LLC, Thornmint Ct, San Diego, CA USA Marco Pieters, Rudy Peeters, Daniel Smith, Uwe Stamm, Sjoerd Lok, Arthur Minnaert, Martijn van Noordenburg, Joerg Mallmann, David Ockwell, Henk Meijer, Judon Stoeldraijer, Christian Wagner, Carmen Zoldesi, Eelco van Setten, Jo Finders, Koen de Peuter, Chris de Ruijter, Milos Popadic, Roger Huang, Roderik van Es, Marcel Beckers, Hans Meiling,..... ASML Netherlands B.V., De Run 6501, 5504 DR Veldhoven, The Netherlands
4 Minimum Resolution, Half Pitch [nm] Shrink drives need for advanced lithography solutions Minimum Resolution of Critical Device Features 70nm 50nm MPU Metal interconnect 3D NAND Memory Pipe xx Minimum resolution Effective 3D resolution Number of 3D or x-point stacks Confidential Slide 4 11/17/ nm 20nm 10nm 8nm 2D NAND Bit & Word Line 24 3D NAND Half pitch / # stacks 32 Foundry Metal interconnect DRAM Bit line X-point Bit & Word Lines 6nm nm 3nm X-point Half pitch / # stacks Year Production Start
5 Overlay [nm] Focus [nm] Requirements for Overlay & Focus are challenging Year HVM Logic - Foundry 20 nm nm 10 nm 7 nm 5 nm Slide 5 June 22, 2016 Logic - MPU DRAM NAND planar & 3D X-Point 22 nm 14 nm 10 nm 7 nm D2xM D2xL D1xH D1xM D1x 19 nm 3D x24 3D x32 16 nm 3D x48 14 nm 3D x64 3D x96 3D x128 x192 2x x2 2x x4 1x x4 1x x8 Production Ramp R&D Roadmap On-Product Overlay ~ 4.0 nm 5.0 ~ 3.5 nm 5.0 ~ 3.5 nm 4.5 ~ 2.5 nm 3.5 ~ 2.5 nm 2.5 ~ 2.0 nm 2.5 ~ 1.8 nm On-Product Focus 2 90 ~ 60 nm 80 ~ 60 nm 70 ~ 60 nm 60 ~ 50 nm 60 ~ 50 nm 50 ~ 40 nm 50 ~ 40 nm 1 Range for Logic & Memory critical layers 2 Range for EUV & ArF immersion foundry production wafer focus control requirements with process window enhancement techniques Holistic Overlay Roadmap On Product Overlay Matched Scanner Overlay Application & Process Holistic Immersion Focus Control Roadmap On Product Focus Control Scanner Focus Control Application & Process
6 ASML s holistic shrink roadmap: DUV-EUV coexistence Slide 6 Extend DUV to support multiple patterning Introduce EUV to volume manufacturing Support both with a suite of process window enhancement, control and calibration products
7 Slide 7 12 Jan 2016 EUV Why It Helps
8 EUV single exposure replaces immersion multiple patterning 2D-Metal at 32nm pitch achieved with Quasar illumination Confidential Slide 8 April 2016 ArFi LE 3 (triple patterning) EUV Single Exposure 32nm pitch / 16nm CD Dose: 20 mj/cm 2 48nm pitch / 24nm CD Quasar Quasar, illumination Pupil Pupil Fill ratio Fill 20% ratio 20% In cooperation with IMEC
9 EUV: The overall economic value to Customers Slide Per-layer patterning cost comparison EUV clear winner for critical layers (3x ArFi immersion and above) Shorter cycles of learning = faster time to market Single-expose layers reduce process complexity (6-month gain) 3 Steeper ramp to higher yield Fewer multiple patterning layers mean higher yield (up to 9%) 4 Superior electrical properties Better binning 5 In a full fab, EUV enables higher output DRAM example: 78% vs 62% bit growth
10 Increasing Yield 2 Faster yield ramp with EUV means faster time to market Slide 10 6 months 1D-ArFi 1D-EUV 2D-EUV May June July Aug Sept Oct Nov Dec Jan Feb Mar Apr May June A simpler process goes through yield ramp faster
11 4 Electrical data confirms: EUV enables superior devices Slide 11 SADP: Self aligned double patterning
12 Slide Jan 2016 EUV Where are we now
13 Customer Confidence in EUV continues to increase Slide 13 Source power 125W configuration at customer sites 210 Watts of dose-controlled EUV power demonstrated Availability Five customer systems have achieved a four-week average availability of more than 80%; however, consistency still needs to be improved Productivity More than 1,200 wafers per day (wpd) exposed on NXE:3350B at a customer site Peak performance near target of 1500 wpd (achieved 1488 wpd at ASML)
14 NXE extension roadmap to optimize capital efficiency Slide 14 1 st system shipment 2013 Logic DRAM 55 WPH 125 WPH 145 WPH 185 WPH R&D NXE:3300B 250W LPP Half pitch 22 nm Focus* 110 nm DCO/MMO 3.0/5.0 nm OPO * 7.0 nm UVLS D1H SNEP 3350B NXE:3350B 16 nm 70 nm 1.5/2.5 nm 3.5 nm D1M 20% PFR illuminator OFP 3350B-3400B NXE:3400B 350W LPP 13 nm 60 nm 1.4/<2.0 nm 2.5 nm x D1L UVLS Mk2 Orion 200 Lens thermal NXE:3450C 13 nm 50 nm 1.2/<1.7 nm 2.0 nm <D1L ~2.5 Products under study 500W source Anamorphic lens Stages, handlers High NA <8 nm <40 nm 1.0/<1.4 nm 1.5 nm Roadmap: July 2016 * On product overlay (OPO) and focus are not ATP specs, but required performance for specific customer nodes to be achieved including Application and DUV configuration
15 Slide Jan 2016 EUV Installed Base
16 NXE:3350B: 2x overlay improvement at 16nm resolution Supporting 7nm logic, ~15nm DRAM requirements Slide 16 Overlay set up Set-up and modeling improvements Reticle Stage Better thermal control increased servo bandwidth Projection Optics Higher lens transmission improved aberrations and distortion SMASH sensor Improved alignment sensor Off-Axis Illuminator FlexPupil Wafer Stage Improved thermal control Resolution Full wafer CDU DCO MMO 16nm < 1.3nm < 1.5nm < 2.5nm Spotless NXE Automated wafer table cleaning Focus control < 70nm Productivity 125 WPH New UV level sensor Improved air mounts Overlay Imaging/Focus Productivity
17 Total number of wafers exposed >405k wafers exposed on NXE:3300B at customer sites Currently 8 systems running in the field Slide , , , , , , , ,000 50, Week
18 NXE:3350B: 125W settings qualified Slide 18 Mean pulse energy at Intermediate Focus ~3mJ EUV power at Intermediate Focus 125W Energy control Overhead ~20%
19 Dose controlled EUV power (W) Progress in source power supporting productivity roadmap to >125 WPH Slide NOMO (delivered) 3100 MOPA (not shipped) 3100 MOPA+PP (not shipped) 3300 MOPA+PP (delivered) 3400 MOPA+PP (development) Year CE~5.5% 210W with dose in specifications obtained on development source
20 Slide Jan 2016 EUV Installed Base: more than power alone
21 Process: resist towards 16nm resolution at 125 WPH 19% EL, 4.4nm 2. Also 13nm resolved with 17% EL and 4.2nm 2 Slide 21 NXE:3350B 16nm Horizontal Dense lines/spaces 13nm Horizontal Dense lines/spaces Reference CAR New formulation CAR New Inpria resist (NTI non-car) CAR New Inpria resist (NTI non-car) SEM Dose 40 mj/cm 2 25 mj/cm mj/cm 2 ~40 mj/cm 2 31 mj/cm 2 Exposure Latitude 16 % 16 % 19 % - 17 % DoF 145 nm 100 nm 125 nm nm LWR 4.6 nm 5.2 nm 4.4 nm 4.5 nm 4.2 nm LWR = Line Width Roughness DoF = Depth of Focus EL = Exposure Latitude BE/BF = Best Energy/Best Focus CAR = Chemically Amplified Resist
22 NXE:3350B overlay and focus performance Well in specification due to HW improvement and new calibrations Slide 22 Dedicated chuck overlay [nm] Matched machine overlay [nm] Focus uniformity [nm]
23 Overlay 99.7% (nm) NXE:3350B matched machine overlay with NXT:1980Di <2.8nm Slide 23 Lot (x: 2.8nm, y: 2.5nm) Wafer number
24 NXE Pellicles are being mounted and used in scanners Slide 24 Prototype pellicle on early integration mounting tooling
25 Slide Jan 2016 EUV source architecture, performance, power scaling The beauty of the ASML/CYMER EUV Source
26 Beam Transport Intermediate Focus Unit EUV Source Architecture, Sn LPP MOPA with Pre-pulse Collector Tin Droplet Generator Vessel Scanner Slide 26 Laser Metrology, MP PP Focusing Collector x z metrology for source to scanner alignment Vanes High Power Amplification Chain Tin catch Source Pedestal CO2 system Fab Floor Fab Floor Scanner Pedestal High Power Seed System On-droplet Gain Optimization Power Amplifiers PP&MP Seed unit Laser / EUV dose Controls Sub-fab Floor
27 EUV LPP Source Key Technologies Slide
28 Source power and availability drive productivity Technology development work is ongoing to improve all aspects Slide 28 Productivity = Throughput( EUV Power) Availability EUV Power= (CO 2 laser power CE transmission)*(1-dose overhead) Raw EUV power Source power from 10 W to > 250 W Drive laser power from 20 to 40 kw Conversion efficiency (CE) from 1 to 6% Dose margin from 50 to 10% Optical transmission Source availability Automation Collector protection Droplet generator reliability & lifetime Drive laser reliability
29 8kW 10W 45% 12kW 50W 30% 17% 10% 15kW 20kW 100W Laser Power (kw) EUV Power (W) Dose Overhead (%) 210W EUV power scaling through 2016 EUV power ~ CO 2 power * Conversion Efficiency * (1-Dose Overhead) Slide 29 CE=5.5% CE=3.5% CE=2.5% CE=0.8% NOMO and NXE:3100 drive laser MOPA+PP and NXE:3100 drive laser MOPA+PP and NXE:3300B Drive Laser MOPA+PP High Power Amplification Chain
30 Conversion efficiency: Optimizing pre-pulse to create a more efficient Target target expansion fills main pulse beam waist Slide 30 Prepulse (low energy) Mainpulse (high energy) Target shape changes from droplet to disk
31 Conversion efficiency (%) Increased conversion efficiency with Pre-pulse by optimization of target size, shape and density 7 Slide no PP small disk large disk partial-cloud cloud EUV CE ~6% demonstrated on development platforms
32 Plasma scale length (Z) is the key to increase its volume Volume-distributed laser absorption enhances CO 2 laser deposition in plasma Schematic diagram of traditional LPP T e Z absorption ablation n Hydrodynamic simulation of CO 2 Sn LPP T e Z Slide laser n c EUV n e n i Corona Laser Laser, e, ions Energy transport Heat, radiation flow Mass flow SPIE 2016, 97760K-1, Michael Purvis Advances in predictive plasma formation modelling
33 Slide Jan 2016 The Drive Laser, Droplet Generator And collector
34 Laser power (W) CO 2 laser power scaling to scale EUV power Efficient CO 2 laser pulse amplification Slide 34 Throughput, WPH EUV power (W) CO 2 lase power (kw) CO 2 drive laser Laser pulse duration (ns)
35 Droplet position, m Droplet Generator, Principle of Operation Tin is loaded in a vessel & heated above melting point Pressure applied by an inert gas Tin flows through a filter prior to the nozzle Tin jet is modulated by mechanical vibrations Slide 35 Sn Gas Filter Modulator Nozzle Pressure: 1005 psi Pressure: Frequency: 30 khz Frequency: 50 khz 140 m 50 m Diameter: 30 m 31 µm Diameter: 37 µm Distance: 1357 µm Velocity: 40.7 m/s 1025 psi Distance: 821 µm Velocity: 41.1 m/s 16 m Pressure: 1025 psi Frequency: 500 khz Diameter: 14 µm Distance: 82 µm Velocity: 40.8 m/s Time, sec Pressure: 1005 psi Frequency: 1706 khz Diameter: 9 µm Distance: 24 µm Velocity: 41.1 m/s Fig. 1. Images of tin droplets obtained with a 5.5 μm nozzle. The images on the left were obtained in frequency modulation regime; the image on the right with a simple sine wave signal. The images were taken at 300 mm distance from the nozzle. Short term droplet position stability σ~1 m
36 Forces on Droplets during EUV Generation Slide 36 High EUV power at high repetition rates drives requirements for higher speed droplets with large space between droplets
37 High Speed Droplet Generation Slide 37 Pressure (Speed) 3.5 MPa (26 m/s) 6.9 MPa (40 m/s) 13.8 MPa (58 m/s) 27.6 MPa (84 m/s) 41.4 MPa (104 m/s) 55.2 MPa (121 m/s) 1.5 mm Tin droplets at 80 khz and at different applied pressures. Images taken at a distance of 200 mm from the nozzle
38 EUV Collector: Normal Incidence Slide 38 Ellipsoidal design Plasma at first focus Power delivered to exposure tool at second focus (intermediate focus) 650 mm diameter Collection solid angle: 5 sterrad Average reflectivity: > 40% Wavelength matching across the entire collection area 5sr Normal Incidence Graded Multilayer Coated Collector
39 Collector Protection EUV collector Temperature controlled DG Hydrogen buffer gas causes deceleration of ions Hydrogen flow away from collector reduces atomic tin deposition rate Slide 39 H 2 flow Laser beam Sn droplet / plasma IF Reaction of H radicals with Sn to form SnH 4, which can be pumped away. Sn (s) + 4H (g) SnH 4 (g) Sn catcher Vessel with vacuum pumping to remove hot gas and tin vapor Internal hardware to collect micro particles
40 Collector Lifetime on NXE Slide %/Gp: observed at a customer About 4 months
41 250W feasibility proven without increase in protective Hydrogen flow No rapid collector contamination, allowing stable droplets and >125 mj/cm² Slide 41 ~200W dose controlled power
42 Summary Significant progress in EUV power scaling, Slide 43 - CE is up to 6 % - Dose-controlled power is up to 210 W CO 2 developments support EUV power scaling, - Clean (spatial and temporal) amplification of short CO 2 laser pulse - High power seed-table enables CO 2 laser power scaling Significant progress made in Source Availability - >80% source availability in the field - >1000 hrs droplet generator runtime - >100 Gp collector lifetime
43 Acknowledgements: Slide 44
44
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