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Research

Elektronische Eigenschaften von Nanodrähten: Dotierung, Streuung, Kontakte & Bauelemente (Prof. Krstić)


The focus of our research is on electronic (spinpolarised) charge-transport phenomena in quasi-1D semiconductor (Ge, Si, InAs) and metal nanowires (Ag), as well as doped carbon nanotubes.

Such structures are proto-type building-blocks for future Information and Communication Technology devices (more-than-Moore and high-speed electronics).

Main aspects investigated are (spinpolarised) charge-injection, contact-resistivity & -topology, scattering from defects, intrinsic and introduced by post-implantation, and nanowire surface incl. the impact of functionalisation, electron-mediated magnetic coupling between dopant atoms, and correlation of the electronic properties with different nanowire synthesis techniques. Single and arrays of nanowires and single carbon nanotubes are experimentally studied by electrical transport measurements down to cryogenic temperatures and in the presence of external magnetic fields.

Key-words: nanowire, nanotube, electrical transport, doping, surface-doping, contact, device, surface-doping, metal-to-insulator transition, long-range magnetic coupling

Related publications:

M. Koleśnik, T. Lutz, G. Collins, S. Biswas, J. Holmes, V. Krstić

Contact resistivity and suppression of Fermi level pinning in side-contacted germanium nanowires

Applied Physics Letters 103, 153101 (2013)

 

R.A. Farrell, N. Kinahan, S. Hansel, K. Stuen, N. Petkov, M. Shaw, L. West, V. Djara, R. Dunne, O. Varona, P. Gleeson, S.J. Jung, H.Y. Kim, M. Kolesnik, T. Lutz, C. Murray, J.D. Holmes, P.F. Nealey, G.S. Duesberg, V. Krstić, M.A. Morris

“Large-Scale Parallel Arrays of Silicon Nanowires via Block Copolymer Directed Self-Assembly”

Nanoscale 4, 3228 (2012)

 

M. Koleśnik, S. Hansel, T. Lutz, N. Kinahan, M. Boese, V. Krstić

“Resolving in-situ specific-contact -, current-crowding- and channel-resistivity in nanowire devices – a case study with silver nanowires”

Small 7, 2873 (2011)

 

S. Barth, M. Koleśnik, K. Donegan, V. Krstić, J.D. Holmes

"Diameter Controlled Solid-Phase Seeding of Germanium Nanowires: Structural Characterization and Electrical Transport Properties"

Chemistry of Materials 23, 3335 (2011)

 

V. Krstić, C.P. Ewels, T. Wågberg, M.S. Ferreira, A.M. Janssens, O. Stéphan, M. Glerup

“Indirect magnetic coupling in light-element-doped single-walled carbon nanotubes”

ACS nano 4, 5081 (2010)

 

G. Collins, M. Koleśnik, V. Krstić, J.D. Holmes

"Germanium Nanowire Synthesis from Fluorothiolate-Capped Gold Nanoparticles in Supercritical Carbon Dioxide"

Chemistry of Materials 22, 5235 (2010)

 

V. Krstić, M. Glerup, S. Hansel, M. Lafkioti

”Doped single-walled carbon nanotubes and low-mobility graphene: impact of disorder and dopants on electronic magnetotransport”

Phys. Status Solidi - Rapid Research Letter 3, 187 (2009)

 

V. Krstić, G.L.J.A. Rikken, P. Bernier, S. Roth, M. Glerup

“Nitrogen doping of metallic single-walled carbon nanotubes: n-type conduction and dipole scattering”

Europhys. Lett. 77, p. 370012 (2007)

 

V. Krstić, S. Roth, M. Burghard, J. Weis, K. Kern

“Suppression of superconductor quasiparticle tunnelling into single-walled carbon nanotubes”

Phys. Rev. B 68, 205402 (2003)

 

V. Krstić, J. Weis, S. Roth

“Magnetotransport through single-walled carbon nanotubes”

Synth. Met. 135, p. 799-800 (2003)

 

V. Krstić, S. Blumentritt, J. Muster, S. Roth, A. Rubio

“Role of disorder on transport in boron-doped multiwalled carbon nanotubes”

Phys. Rev. B 67, 041401 (Rapid Communication) (2003)

 

G. Gu , M. Burghard, G.T. Kim, G. S. Düsberg, P. W. Chiu, V. Krstić, S. Roth, W.Q. Han

“Growth and electrical transport of germanium nanowires”

J. Appl. Phys. 90, p. 5747-5751 (2001)

 

V. Krstić, S. Roth, M. Burghard

“Phase breaking in three-terminal contacted single-walled carbon nanotube bundles”

Phys. Rev. B 62, p. R16353-R16355 (2000)

 

V. Krstić, J. Muster, G.S. Duesberg, G. Philipp, M. Burghard, S. Roth

“Electrical transport in single-walled carbon nanotube bundles embedded in Langmuir-Blodgett monolayers”

Synth. Met. 110, p. 245-249 (2000)

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