Nanowires

Transcript

1. Nanowires Arash Badie Modiri Shahid Beheshti University Apr 19, 2015 1
2. Outlines • Physical Properties • Applications • Synthesis 2
3. Size Diameter ∝ 10−8 meters Length/Width > 103 3
4. “Quantum Wires” Electrons are laterally confined thus they occupy different states. 4
5. Types • Superconducting • Metallic • Semiconducting • Insulating • Molecular nanowires (DNA) 5
6. Nanoelectronics Doped nanowires p-n junction Nanowire logical gates “Multifunctional Devices and Logic Gates With Undoped Silicon Nanowires”. Mongillo, Massimo et. al. (2012) 6
7. Moore’s law 3D microelectronics “Cramming more components onto integrated circuits”. Moore, Gordon E. (1965). “Nanowire Lithography on Silicon”. Colli, Alan et. al. (2008). 7
8. Happy 50th Birthday Moore’s Law :) 8
9. Synthesis 9
10. Bottom-up: VLS “Growth of silicon nanowires via gold/silane vapor–liquid– solid reaction”. Westwater et. al. (2012) 10
11. Bottom-up: VLS Gold (Au) particle catalyzed CVD growth of Si nanowires 11
12. Bottom-up: Solution Phase Synthesis Grow nanowires in solutions Many types of materials 12
13. Lithography Optical Electron beam 13
14. “Fabrication of metallic nanowires with a scanning tunneling microscope”. Kramer et. al. (1995) Lithography: Scanning Tunneling Microscope 14
15. Top-down: Suspension Indenting the tip of a STM in the surface of a metal near its melting point, and then retracting it. 15
16. Future Microelectronics Nanosensors 16
17. Thanks! File will be available on dropbox and speakerdeck: https://speakerdeck.com/arashbm 17