Molecular and carbon based electronic systems
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1 when Wednesday, 08h15 10h00 where seminar room 3.12, Physics Dpt, Klingelbergstrasse 82 credit 2KP debit attendance + 1 presentation VV lecture Nr web Michel Calame Physics Dpt. & SNI, Uni Basel michel.calame@unibas.ch room 1.09, 1 st floor, tel: Thilo Glatzel Physics Dpt., Uni Basel thilo.glatzel@unibas.ch room 3.04., 3 rd floor, tel: Vorlesung Uni Basel, HS2015 context transistor > 60 years old 1947, 24th December John Bardeen, Walter Brattain, William Schockley ATT Bell Labs first point contact transfer resistor Nobel 1956 Bell labs Bell labs
2 context? MRS Bulleting 2010 special issue Science 2010 special issue What technologies will extend silicon's reign as the preeminent material for electronics? What materials will ultimately supplant silicon? Charles Day, December 2013 context? materials Oxides interfaces Organic & inorganic materials with elastomeric substrates Metal oxides charge, spin, orbital degrees of freedom for diversity of phases exploiting e e correlation Stretchable electronics Rodgers et al., Science 2013 LaAlO3 SrTiO3 heterostructures Mannhardt et al., Science 2013 Takagi et al., Science 2013
3 context materials current limitations for computers development? NB: other 2D materials: e.g. MoS2, true semiconductor MRS Bulleting 2010 special issue context? materials Discovery magazine 2013 Nature 1998, news&views
4 context? materials Nature 2013 Nature 2011 spider hair bottom up top down IC LSI VLSI ULSI supramolecular chemistry cell virus proteins supramolecules chemistry no way to escape molecules (?) molecule atom
5 Nature Nanotech Nature Nanotech. 2013
6 Nature Nanotech Nature Nanotech contacting one molecule?
7 break junctions: a draw bridge at the atomic scale break junctions
8 break junctions elongation: d= 6thz/L 2 reduction factor: r= d/ z (1.6-4) 10-5 Z = 10 m d ~ 3 Å vertical speed: v z =30 m/s nm/s electrodes separation speed atomic-scale metallic contacts with well controlled sub-nm gap in liquid Moreland & Ekin, J. Appl. Phys, (1985); Ruitenbeek et al., Phys. C (1992); Reed et al., APL (1995) nanometer and molecular-scale junctions "playground " for fundamental aspects electro mechanical properties (e.g.: atomic, molecular switch) transport at s, ns, ps,... e e and e ph interactions heat flow (atomic & molecular level) spin dependent transport & selectivity exciton generation, separation interaction with EM field (plasmonics) coherence aspects only indirect evidence to date device aspects control of molecule electrode interface reliable 2 terminal switches (V driven) conformational change, interference few molecules devices and monolayers, pores & crossbars (Sony, HP, NIST, IBM) carbon based electronics upscaling, programmability NB: variability, tunneling, power dissipation, cost, are current issues in CMOS tech.
9 molecular junction nanometer and molecular scale junctions structural disorder electrodes and junction geometry interactions anchoring, self assembly, polymerization fluctuations mobility of (surface) atoms, molecular distortions, multiple local energy minima molecular junction nanometer and molecular scale junctions structural disorder electrodes and junction geometry interactions anchoring, self assembly, polymerization fluctuations mobility of (surface) atoms, molecular distortions, multiple local energy minima junction formation (and breaking up): dynamic process, variability time scale(s) G(t), force, current, local environment effect optical spectroscopy local geometry and structure effect
10 controlling junction formation drifting molecules, stochastic anchoring, clustering undefined junction geometry & conductance drifting surface atoms, metal protrusions undefined electrostatic landscape variability, low yield and lack of control in key electrical parameters controlling junction formation drifting molecules, stochastic anchoring, clustering undefined junction geometry & conductance drifting surface atoms, metal protrusions undefined electrostatic landscape variability, low yield and lack of control in key electrical parameters Carbon based contact materials as electrodes: FLG vd Zandt et al., Nano Lett SWNT Krupke et al., Nat. Nanotech C fiber tips Agrait et al., Nanoscale Res. Lett monolayer graphene...? paradigm shift for molecular electronics Lörtscher, Nat. Nano 2013 FP7 ITN MOLESCO; see also Focus issue Nat. Nanotech 2013
11 context? assembly of nanoscale objects? self assembly Nature 2006 upscalability 450mm fab / US$ 300mm fab / 10 9 US$ Nano Lett directed self assembly IMEC center, Belgium, : 15nm pitch Nature Comm goals provide background & fundamental aspects to anchor understanding discuss devices/applications where organic compounds are currently used fundamental aspects devices
12 Tentative program Semester week Date Contents Who Introduction Carbon from 0D to 3D: fundamental properties mc Carbon from 0D to 3D: fundamental properties mc Single molecule deposition and properties on surfaces tg Molecule assemblies analysis and contacting on surfaces tg Molecular junctions: contacting, IVs mc Tentative program Semester week Date Contents IVs (116 along plateau) Who 20 avg IV current (na) Introduction Carbon from 0D to 3D: fundamental properties Carbon from 0D to 3D: fundamental properties mc Single molecule deposition and properties on surfaces tg Molecule assemblies analysis and contacting on surfaces tg Molecular junctions: contacting, IVs mc voltage (V) mc
13 Tentative program Semester week Date Contents Who Template structures for functional molecular junctions: NP arrays Anton Vladyka Molecular junctions: QDots, vibronic excitations mc Graphene for molecular electronics: structure, growth, Raman spectroscopy, electroburning mc Carbon nanotubes: from growth to electrical transport Mechanical properties of carbon-based composite materials Markus Weiss Clemens Dransfeld, FHNW Tentative program Semester week Date Contents Who Template structures for functional molecular junctions: NP arrays Anton Vladyka Molecular junctions: QDots, vibronic excitations mc Graphene for molecular electronics: structure, growth, Raman spectroscopy, electroburning mc Carbon nanotubes: from growth to electrical transport Mechanical properties of carbon-based composite materials Markus Weiss Clemens Dransfeld, FHNW
14 Tentative program Semester week Date Contents Who Diamond: production, nano-diamond, NV vacancies tg Sensing mc Graphene oxide and applications tg Mini-workshop: talks by students mc, tg Tentative program Semester week Date Contents Who Diamond: production, nano-diamond, NV vacancies tg Sensing mc Graphene oxide and applications tg Mini-workshop: talks by students mc, tg
15 Pick one topic for your talk + write it on the registration sheet
Molecular and carbon-based electronic systems
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