Computational Lithography Requirements & Challenges for Mask Making. Naoya Hayashi, Dai Nippon Printing Co., Ltd
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1 Computational Lithography Requirements & Challenges for Mask Making Naoya Hayashi, Dai Nippon Printing Co., Ltd
2 Contents Introduction Lithography Trends Computational lithography options More Complex OPC SMO, ILT Mask challenges Mask fabrication Shot count Inspection and metrology Summary OPC: optical proximity correction SMO: source mask optimization ILT: inverse lithography technology
3 ITRS Lithography Solutions ~ DRAM/MPU ITRS 2011 edition First Year of IC Production DRAM ½ pitch (nm) (contacted) MPU/ASIC Metal 1 1/2 pitch (nm) nm Imm nm DP 22 EUV 193nm MP ML2 (MPU) Imprint (DRAM) 16 EUV 193nm MP ML2 Imprint DSA + litho platform 11 EUV / EUV + MP EUV (6.Xnm) ML2 Imprint Litho + DSA Innovation Narrow Options MPU / DRAM time line Narrow Options Narrow Options
4 ITRS Lithography Solutions ~ Flash ITRS 2011 edition First Year of IC Production Flash ½ Pitch (nm) (uncontacted Poly)(f) nm DP nm DP NAND Flash Time Line nm MP EUV Imprint Narrow Options 11 EUV + MP 193nm MP EUV (6.xnm) Imprint EUV + DSA Innovation Narrow Options Optical lithography extension is expected
5 Contents Introduction Lithography Trends Computational lithography options More Complex OPC SMO, ILT Mask challenges Mask fabrication Shot count Inspection and metrology Summary
6 Strong OPC, Source & Mask Optimization Complexity of Mask Optimized Area Constrained OPC Better Performance Exposure Latitude Complexity of Source Computational Lithography solutions such as SMO will be needed
7 Evaluation of DOF improvements with SMO Bias OPC design Hole Size (nm) CP Bias OPC SO Bias OPC SO Strong OPC SO + Strong OPC : DOF=200nm CP + Strong OPC : DOF=160nm * Collaboration work with Nikon Strong OPC design SO Illumi. + Strong OPC Source 56 SO + Bias OPC : DOF=130nm Focus Level (nm) Focus Level (nm) DOF = 200nm CP Illumi. + Strong OPC DOF = 160nm DOF margin was improved by SMO SO: source optimization, CP: cross pole
8 Details of SMO Evaluation ~ Motif patterns vs. Optimized source shapes(metal Layer)~ SRAM * Collaborative evaluation with AIST Japan Evaluation of optimized source shapes based on various target patterns. Learn the balance of optimized source shape across the pattern layout? PA PB PC PD * Motif patterns are from sparse to dense.
9 Details of SMO Evaluation ~ Motif patterns vs. Optimized source shapes(metal Layer)~ SRAM * Collaborative evaluation with AIST Japan Evaluation of optimized source shapes based on various target patterns. Learn the balance of optimized source shape across the pattern layout? PA PB PC PD Even within a layer, optimized source shape varies greatly
10 Details of SMO Evaluation ~ Motif patterns vs. Optimized source shapes(metal Layer)~ * Collaborative evaluation with AIST Japan SRAM Optimized Source Shape PA PB PC PD Optimized source shape can be obtained with wider reference points
11 Contents Introduction Lithography Trends Computational lithography options More Complex OPC SMO, ILT Mask challenges Mask fabrication Shot count Inspection and metrology Summary
12 EB Data Grid Size vs. Lithography Margin * Collaboration work with Nikon Optimum data grid balancing litho margin and mask complexity Shot # = 1 Shot # = 340x Shot # = 93x Shot # = 53x Shot # = 24x Shot # = 7x Bias OPC Free form Grid= 1 nm Grid = 4 nm Grid = 16 nm Grid = 32 nm Exposure Latitude (%) Data grid vs. EL EL (%) Best Dose Shift (%) Data grid vs. Dose shift Dose Shift Data grid vs. Dose shift Grid Size (nm) Grid Size (nm) < 1/10 of EB shots with optimum grid size
13 Shot Count Reduction Approaches conventional fracturing optimized fracturing litho-check bias MB-MDP* overlapped shots intelligent bias MB-MDP : Model-Based Mask Data Preparation litho-check EB writing check ** virtual pattern Fewer shot counts will be obtained by optimized overlapping shots
14 Shot Count Reduction Approaches conventional fracturing MB-MDP overlapped shots with circular shape simplifying assist features ** virtual pattern Fewer shots will be obtained by dedicated shot shapes
15 Trials & Examples Conventional Fracturing MB-MDP overlapped shots 1/3-1/4 features Courtesy of Overlapped fracturing reduces the shot counts with optimal effect
16 Mask Defect Inspection Tools Tool KLA597XR Teron617 NPI-6000 Vendor KLA-Tencor KLA-Tencor NuFlare Technology node (nm) nm nm nm Wavelength (nm) Pixel size (nm) 72 / 90 / / / 70 / 92 Performance Min. sense. (nm) Advanced inspection systems must be adopted
17 Printability Metrology Tool ~ AIMS32 Tool AIMS45 AIMS32 Vendor Carl Zeiss Carl Zeiss Technology node (nm) nm nm Wavelength (nm) Illumination numbers Measurement repeat. (3σ, nm@wafer) Stage accuracy (nm) < 2000 < 150 TAT (stack/hrs) Wafer level CD application No Yes SMO application No Yes Advanced printability evaluation tool will be needed
18 Summary ArF lithography will be extended with computational lithography technologies Further optimization of SMO may be needed Mask data is becoming more complex and intensive Successful trials are underway using overlapped shots with MB-MDP Mask defect inspection and printability metrology tools for computational lithography mask have been evaluated More close collaboration needed for future work among mask suppliers, mask users, and related tool suppliers
19 Acknowledgement Nikon for collaboration work on SMO evaluation D2S for overlapped shot trial K. Kadota of AIST for SMO evaluation, and the part of work was supported by NEDO E. Tsujimoto, and K. Hayano of DNP for providing evaluation data, and N. Toyama of DNP for shot reduction approach
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