Silicon nanowire

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Tuning the response of non-allowed Raman modes in GaAs nanowires

Anna Fontcuberta i Morral, Federico Matteini, Esther Alarcon Llado, Emanuele Uccelli, Francesca Amaduzzi, Hubert Hautmann

We report on the use of photonic resonances in Raman spectroscopy on single nanowires for the enhancement of forbidden modes and the study of the interaction of phonons with free-carriers. This is achieved by suspending nanowire over a trench and detecting ...

Iop Publishing Ltd2016

Time-Resolved Nonlinear Coupling between Orthogonal Flexural Modes of a Pristine GaAs Nanowire

Anna Fontcuberta i Morral, Federico Matteini

We demonstrate nonlinear coupling between two orthogonal flexural modes of single as-grown GaAs nanowires. The resonant frequency of one mode can be shifted over many line widths by mechanically driving the other mode. We present time-domain measurements o ...

American Chemical Society2016

Controlled growth of CH3NH3PbI3 nanowires in arrays of open nanofluidic channels

László Forró, Endre Horvath, Andrzej Sienkiewicz, Bálint Náfrádi, Massimo Spina, Eric Joseph Bonvin

Spatial positioning of nanocrystal building blocks on a solid surface is a prerequisite for assembling individual nanoparticles into functional devices. Here, we report on the graphoepitaxial liquid-solid growth of nanowires of the photovoltaic compound CH ...

Nature Publishing Group2016

Strain-Induced Band Gap Engineering in Selectively Grown GaN-(Al,Ga)N Core-Shell Nanowire Heterostructures

Anna Fontcuberta i Morral, Luca Francaviglia

We demonstrate the selective area growth of GaN-(Al,Ga)N core shell nanowire heterostructures directly on Si(111). Photoluminescence spectroscopy on as-grown nanowires reveals a strong blueshift of the GaN band gap from 3.40 to 3.64 eV at room temperature. ...

American Chemical Society2016

Piezoelectric enhancement under negative pressure

Nava Setter, Alexander Tagantsev, Tomas Sluka, Alexander Kvasov, Silviu Cosmin Sandu, Jin Wang

Enhancement of ferroelectric properties, both spontaneous polarization and Curie temperature under negative pressure had been predicted in the past from first principles and recently confirmed experimentally. In contrast, piezoelectric properties are expec ...

Nature Publishing Group2016

Polarization response of nanowires a la carte

Anna Fontcuberta i Morral, Esther Alarcon Llado, Alberto Casadei, Martin Heiss, Eleonora Russo, Francesca Amaduzzi

Thanks to their special interaction with light, semiconductor nanowires have opened new avenues in photonics, quantum optics and solar energy harvesting. One of the major challenges for their full technological deployment has been their strong polarization ...

Nature Publishing Group2015

Modulation of Fluorescence Signals from Biomolecules along Nanowires Due to Interaction of Light with Oriented Nanostructures

Anna Fontcuberta i Morral, Esther Alarcon Llado

High aspect ratio nanostructures have gained increasing interest as highly sensitive platforms for biosensing. Here, well-defined biofunctionalized vertical indium arsenide nanowires are used to map the interaction of light with nanowires depending on thei ...

American Chemical Society2015

Growth mechanisms of III-V semiconductor nanostructures on silicon

Eleonora Russo

The aim of this thesis is to understand the dynamics of the growth of catalyst-free III-V semiconductor nanostructures on silicon substrates, focusing the attention mainly on the early stages of growths. A detailed understanding of this first phase of the ...

EPFL2015

Cracking the Si Shell Growth in Hexagonal GaP-Si Core-Shell Nanowires

Anna Fontcuberta i Morral, Sonia Conesa Boj

Semiconductor nanowires have increased the palette of possible heterostructures thanks to their more effective strain relaxation. Among these core shell heterostructures are much more sensitive to strain than axial Ones. It is now accepted that the formati ...

American Chemical Society2015

Hydrothermal Synthesis of SrTiO3: Role of Interfaces

Andrea Testino, Agnese Carino, Paolo Nanni

The hydrothermal synthesis of SrTiO3 in a Sr(OH)(2)/NaOH solution by reaction of four different single crystalline titanium precursors (anatase, rutile, sodium titanate, and hydrogen titanate) having the same nanowire morphology was investigated under stag ...

American Chemical Society2015

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Modulation of Fluorescence Signals from Biomolecules along Nanowires Due to Interaction of Light with Oriented Nanostructures

Anna Fontcuberta i Morral, Esther Alarcon Llado

American Chemical Society2015