179 citations · 1.5k across the 33 of their papers we have counts for
14 papers · 1 filter
Atomistic study of an ideal metal/thermoelectric contact: the full-Heusler/half-Heusler interface
Catalin D. Spataru, Yuping He, François Léonard
Half-Heusler alloys such as the (Zr,Hf)NiSn intermetallic compounds are important thermoelectric materials for converting waste heat into electricity. Reduced electrical resistivit…
Atomistic Study of the Electronic Contact Resistivity Between the Half-Heusler Alloys (HfCoSb, HfZrCoSb, HfZrNiSn) and the Metal Ag
Yuping He, François Léonard, Catalin D. Spataru
Half-Heusler(HH) alloys have shown promising thermoelectric properties in the medium and high temperature range. To harness these material properties for thermoelectric application…
High Efficiency Thin Film Superlattice Thermoelectric Cooler Modules Enabled by Low Resistivity Contacts
Yuping He, François Léonard, Douglas L. Medlin +4
V-telluride superlattice thin films have shown promising performance for on-chip cooling devices. Recent experimental studies have indicated that device performance is limited by t…
Uncooled Carbon Nanotube Photodetectors
Xiaowei He, Francois Leonard, Junichiro Kono
Photodetectors play key roles in many applications such as remote sensing, night vision, reconnaissance, medical imaging, thermal imaging, and chemical detection. Several propertie…
Fermi-Level Pinning, Charge Transfer, and Relaxation of Spin-Momentum Locking at Metal Contacts to Topological Insulators
Catalin D. Spataru, Francois Leonard
Topological insulators are of interest for many applications in electronics and optoelectronics, but harnessing their unique properties requires detailed understanding and control…
Many-body effects on the electronic and optical properties of strained semiconducting carbon nanotubes
Catalin D. Spataru, François Léonard
We present many-body \textit{ab initio} calculations of the electronic and optical properties of semiconducting zigzag carbon nanotubes under uniaxial strain. The GW approach is ut…
Physical Removal of Metallic Carbon Nanotubes from Nanotube Network Devices Using a Thermal and Fluidic Process
Alexandra C. Ford, Michael Shaughnessy, Bryan M. Wong +6
Electronic and optoelectronic devices based on thin films of carbon nanotubes are currently limited by the presence of metallic nanotubes. Here we present a novel approach based on…
Nanoscale Effects on Heterojunction Electron Gases in GaN/AlGaN Core/Shell Nanowires
Bryan M. Wong, François Léonard, Qiming Li +1
The electronic properties of heterojunction electron gases formed in GaN/AlGaN core/shell nanowires with hexagonal and triangular cross-sections are studied theoretically. We show…
Tunable bandgaps and excitons in doped semiconducting carbon nanotubes made possible by acoustic plasmons
Catalin D. Spataru, François Léonard
Doping of semiconductors is essential in modern electronic and photonic devices. While doping is well understood in bulk semiconductors, the advent of carbon nanotubes and nanowire…
Diameter-Dependent Electronic Transport Properties of Au-Catalyst/Ge-Nanowire Schottky Diodes
François Léonard, A. Alec Talin, B. S. Swartzentruber +1
We present electronic transport measurements in individual Au-catalyst/Ge-nanowire interfaces demonstrating the presence of a Schottky barrier. Surprisingly, the small-bias conduct…
Color Detection Using Chromophore-Nanotube Hybrid Devices
Xinjian Zhou, Thomas Zifer, Bryan M. Wong +3
We present a nanoscale color detector based on a single-walled carbon nanotube functionalized with azobenzene chromophores, where the chromophores serve as photoabsorbers and the n…
Unusually strong space-charge-limited current in thin wires
A. Alec Talin, François Léonard, B. S. Swartzentruber +2
The current-voltage characteristics of thin wires are often observed to be nonlinear, and this behavior has been ascribed to Schottky barriers at the contacts. We present electroni…
Size-dependent effects on electrical contacts to nanotubes and nanowires
F. Leonard, A. A. Talin
Metal-semiconductor contacts play a key role in electronics. Here we show that for quasi-one dimensional (Q1D) structures such as nanotubes and nanowires, side contact with the met…
Electrical contacts to nanotubes and nanowires: why size matters
Francois Leonard, A. Alec Talin
Metal-semiconductor contacts play a key role in electronics. Here we show that for quasi-one-dimensional structures such as nanotubes and nanowires, side contact with the metal onl…