Figure 1: Scanning electron microscope image close-up of the trench, electrodes, and catalyst pads. The line outlining the trench shows the extent of the wet-etch undercut. Abstract: Semi-conducting carbon nanotubes (CNT) and germanium nanowires (GNWs) are desirable fieldeffect transistor (FET) elements because of their unique electrical properties and physical stability. Previous electromechan...

Germanium nanowires have been grown successfully on titanium. The wires are single crystal, with some low angle stacking faults and other defects. Growth of nanowires on metal substrates offers reduced cost over single crystal substrates, while still offering an electrical contact to the wire core for core-shell junction structures. Summary of Research: Figure 1: 80 nm germanium nanowires on a ...

We have measured the terahertz response of oriented Germanium nanowires using ultrafast optical-pump terahertz-probe spectroscopy. We present results on the time, frequency, and polarization dependence of the terahertz response. Our results indicate intraband energy relaxation times of photoexcited carriers in the 1.5-2.0 ps range, carrier density dependent interband electron-hole recombination...

Within the quest for direct band-gap group IV materials, strain engineering in germanium is one promising route. We present a study of the strain distribution in single, suspended germanium nanowires using nanofocused synchrotron radiation. Evaluating the probed Bragg reflection for different illumination positions along the nanowire length results in corresponding strain components as well as ...

We explore the effects of geometry on thermal conductivity (?) silicon and germanium nanowires, with lengths between 10–120 nm diameters up to 5–6 nm. To this end we perform molecular dynamics simulations LAMMPS software, using Tersoff interatomic potentials. consider nanowires polygonal cross section discuss effect transverse conductivity. also tubular (hollow) core/shell combinations Si/Ge Ge...

Bottom up grown germanium nanowires may have an important role to play in future electronic devices. While the electrical properties of nanowires grown using a metallic seed as a catalyst have been extensively reported we study self-seeded nanowires in this thesis. Such wires are core-shell in nature and are grown without any intentional doping. Self-seeded nanowires have been previously propos...