Emerging Research Materials and Processes
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1 Recipient of the 2005 National Medal of Technology Emerging Research Materials and Processes Center For Hierarchical Manufacturing - National Nanomanufacturing Network: Nanomanufacturing Systems Workshop February 11, 2008 Daniel J.C. Herr, Director Nanomanufacturing Sciences herr@src.org
2 Overview Background and motivation Nanomanufacturing research priorities Overview Selected strategic research opportunities Key messages 2
3 Adding value through functional scaling on CMOS: Dimensional scaling + integration of functional materials Functional Diversification Goals: Sense, Power, Process, Interact, Empower 3 12/2006 ITRS Meeting, Taiwan
4 Rising Cost of Wafer Fabs Vs. GNPs 4
5 Difficult Material Scaling Challenges Line-edge Roughness Long-Range Dimensional Control and Repeatability Pattern Fidelity What Designers See What Inspectors See Resolution: Catalytic Blurring 5
6 Nanomanufacturing Research Priorities Patterning 1.1 Directed Self-Assembly 1.2 Nanoimprint Patterning 1.3 Post NGL Patterning 1.4 Manufacturing for Design 1.5 NGL Extensibility/Limits 1.6 Low-Volume Patterning Environment, Safety, Health 4.1 Water and Energy 4.2 Design for ESH 4.3 Additive/Wasteless Processes 4.4 ESH Impact of New and Nanomaterials for CMOS 4.5 Sustainable Chemical Substitution 4.6 Hierarchical Assessment Nanoengineered/Emerging Materials 2.1 ITRS Identified Emerging Research Materials 2.2 Functional Diversification and Heterogeneous Integration on CMOS 2.3 Low-Temperature Materials and Processes 2.4 Materials by Design 2.5 Deterministic Fabrication Nanocharacterization/Metrology/Modeling 3.1 Limits of Known Characterization Methods 3.2 Nanoscale Defects, Visual, and Non-Visual 3.3 Breakthrough Methods; e.g. In-situ 3D Imaging of Atomic and Nanoscale Materials 3.4 Metrology for MFD and DFM 3.5 Measuring Coupled Nanoscale Phenomena 3.6 Nanoscale Probe-Sample Measurement Uncertainty 6
7 Directed self-assembly: Can it extend nanomanufacturing? 2012 ITRS Emerging Research Material Requirements: Self Assembling Materials Metric Requirements Defects < nm defects cm -2 [Develop a basic understanding of material and process defect related mechanisms; Develop strategies to achieve projected ITRS requirements] Low Frequency LER Gate CD Control Resolution Essential shapes Overlay and registration Mean Throughput Etch and pattern transfer Placement and orientation Multiple Sizes-Pitches/Layer Ease of integration Overall Performance Other ~2.1 nm 3 σ ~1.7 nm 3 σ 11 nm Dense and isolated L/S, circles, hexagonal arrays nm 3 σ 1 W/Min [Via single wafer or batch processing] Satisfy projected ITRS requirements for patterning electronically useful features 20% of the critical dimension 2-3/layer Compatible with CMOS processing Competitive with chemically amplified resist processing ESH impact requirements? Functional diversification applications? Addressed by SRC s Research Team 7
8 Essential Features for Integrated Circuits 8
9 Comparison of Subtractive Versus Bio-assisted Self-Assembly/Patterning EUV Lithographic Patterning [Subtractive Patterning 32 nm] Growth of a Baby [Bio-Assisted Self-Assembly] Assisted Assembly Advantage Bits patterned per second ~ 8.59E+09 bits/s/masking layer 7.53E+17 amino acid equivalents/s ~ 9E+07 Energy required per bit > 1.46E-12 J/bit/masking layer 1.29E-20 J/amino acid equivalent > 1E+8 [4.57 KTLn(2)] Consider leveraging natural processes 9
10 Manufacturing for Design: Technology - Design Interdependencies Global Optimization of: Variability, Performance, Matching, Centering, Reliability, Cost, & Applications Materials Application Specific Materials Sustainability Regular Fabrics Architectures Circle of Innovation Processes Directed Assembly Systems Devices Circuits Design for Manufacturing Manufacturing for Design 10
11 Nanoengineered Materials: Macromolecular Scale Devices are on the ITRS Horizon Atoms per Bit 1.00E E E E E E E E E E+08 Emerging Research Materials Macromolecular Scale Components: Low dimensional nanomaterials Macromolecules Directed self-assembly Complex metal oxides Hetero-structures and interfaces Spin materials Benign and sustainable nanomaterials Macromolecular Scale Devices 1.00E E E E+00 ITRS Revised 2006 from: D. Herr and V. Zhirnov, Computer, IEEE, pp (2001). 11
12 Functional Diversification: Information and Energy Management Distributed intelligent networks of autonomous systems composed at the nano-level with adaptive emergent behaviors; H2 Fuel Cell Powered, Nanotube Composite Aircraft High Altitude Long Endurance Remotely Operated Aircraft 12
13 Thermal and odor (?) via thermal expansion Functional Diversification: Sensing thermal, chemical, mechanical Odor (e.g., sex) via protein gating Vibration and odor via hair arrays and shaftlike mechanical motion 13
14 Tablet PC Functional Diversification: Prototypical Semiconductor Bioelectronics Roadmap 2D arrays of pressure sensors with sub10 μm resolution Sub10μm probe electrodes R e s e a r c h G o a l Bio-FET On-chip integrated energy sources A two-way interface between neurons and transistors Biomimetic material architecure, nanofabrication, and function 2007 Sensing state of individual cell e.g. artificial eye 2xxx Clinical Assistant High-resolution tactile imaging for palpation Implantable microsystems A p p l i c a t i o n 14
15 Low Temperature Processes: Pure Multicomponent Oxides with Peptides as Mineralizing Agents Room-Temperature Fabrication of Complex Ceramics Relative Intensity Degrees 2q No firing with catalyzed growth process! G. Ahmad, M. B. Dickerson, B. C. Church, Y. Cai, S. E. Jones, R. R. Naik, J. S. King, C. J. Summers, N. Kroger, K. H. Sandhage, Adv. Mater., 18, (2006). 15
16 Low Temperature Processes: Packaging - Thermal Behavior of Metal Nano-particles on Substrates Au Ex. Droplet on Demand patterning enables low temperature [130C] Cu sintering and enhanced conductivity. V. Subramanian and J. Bokor What is the ESH impact of 5 nm Cu particles? 16
17 Nanomaterials by Design M. Chen et. al., The Promotional Effect of Gold in Catalysis by Palladium-Gold, Science, 310 [5746], pp (2005). The catalysis rate of ethylene to vinyl acetate is a function of the atomic spacing between Pd atoms in the Pd-Au matrix. What is the correlation between the atomic structure of a surface or catalyst and thin film growth or CNT helicity? 17
18 The Structure-Property Challenge: The Need for a Predictive Material by Design Capability Example. Zinc oxide Why does zinc oxide express different shapes and different physico- chemical properties, with the same zinc oxide composition? Wang et al., Materials Today,
19 Deterministic Fabrication: Goal - Reduce device variability ITRS Trend for the Number of Channel Electrons No. of Channel Electrons ~ D. Herr, with data from the 2005 ITRS S From Shinada et. Al., Enhancing Semiconductor Device Performance Using Ordered Dopant Arrays, Nature, 437 (20) (2005) [Waseda University] D Conductance variability reduced from 63% to 13% by controlling dopant numbers and roughly ordered arrays; Conductance due to implant positional variability within circular implant regions of the ordered array ~ 13%. 19
20 Deterministic fabrication: Continued a)stm image of In nanoclusters on Si(111) at an In coverage of ~0.05 monolayers [Ref.: Li, et. Al., Physical Review Letters, 88, (2002); b)simulation of current flow vs discrete dopant positions [Ref.: David L. Jaeger, Victor V. Zhirnov, Daniel J. C. Herr, SRC Review of Deterministic Doping Project (2003)]. 10nm 10nm 10nm atoms/cm 3 D. Herr, The Potential Impact of Natural Dopant Wavefront (NDW) Roughness On High Frequency Line Edge Roughness Requirements II, Cavin s Corner: SRC (June 2006) and Future Fab (September 2006). 20
21 Key Messages The convergence of today s difficult challenges, emerging market drivers, and recent breakthroughs in materials technology represents a rare opportunity for chemists, chemical engineers, materials scientists, and others to develop breakthrough material and process insertion options; This is a good time for the research and development communities to question some of our basic assumptions. Must the percent variability, with respect to projected application and architecture requirements, increase with functional density? Do emerging materials and processes exist that could enable new and more favorable cost curves for nanoelectronics fabrication? With respect to functional diversification, is it possible to design custom nanomaterials with electronically useful, application specific functionality? However, it remains to be seen whether potential material and process solutions are identified and matured in time to impact key insertion windows. 21
22 Estimates of R&D Pipeline Latency for the Semiconductor Industry: Time Gaps Discovery phase ~20 yrs; Innovation phase ~12 yrs Enabling Background exists Example: Solid State Rectifier Transfer of Knowledge Market production (Established Technology) Entrant Co formed Prototype built (Disruptive Technology) T1~ 20years ~12years Human Carrier Sponsor 1st Customer T2 T3 V. Zhirnov/SRC Solid State Diode T1 26 ( ) T2 7 ( ) T3 6 ( ) Learning Period 13 years Vacuum Tube T1 20 ( ) T2 9 ( ) T3 6 ( ) Learning Period 15 years Transistor T1 25 ( ) T2 6 ( ) T3 5 ( ) Learning period 11years Integrated Circuit T1 17 ( ) T2 3 ( ) T3 5( ) Learning Period 8 years 22
23 Thank you 23
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