Publications de Luca Francaviglia

Excitonic absorption and defect-related emission in three-dimensional MoS2 pyramids

Anna Fontcuberta i Morral, Luca Francaviglia, Marco Negri

MoS2 micro-pyramids have demonstrated interesting properties in the fields of photonics and non-linear optics. In this work, we show the excitonic absorption and cathodoluminescence (CL) emission of MoS2 micro-pyramids grown by chemical vapor deposition (C ...

ROYAL SOC CHEMISTRY2022

GaAs nanoscale membranes: prospects for seamless integration of III-Vs on silicon

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Martin George Friedl, Luca Francaviglia, Nicholas Paul Morgan, Andres Maria Raya Bejarano, Sara Marti Sanchez, Vladimir Dubrovskii

The growth of compound semiconductors on silicon has been widely sought after for decades, but reliable methods for defect-free combination of these materials have remained elusive. Recently, interconnected GaAs nanoscale membranes have been used as templa ...

2020

3D Ordering at the Liquid-Solid Polar Interface of Nanowires

Cécile Hébert, Duncan Thomas Lindsay Alexander, Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Nicolas Tappy, Martin George Friedl, Michele Ceriotti, Luca Francaviglia, Giulio Imbalzano, Mahdi Zamani, Lea Ghisalberti, Sara Marti Sanchez

The nature of the liquid-solid interface determines the characteristics of a variety of physical phenomena, including catalysis, electrochemistry, lubrication, and crystal growth. Most of the established models for crystal growth are based on macroscopic t ...

Wiley2020

Formation, electronic structure, and optical properties of self-assembled quantum-dot single-photon emitters in Ga(N,As,P) nanowires

Luca Francaviglia

Quantum dots (QDs) formed in semiconductor nanowires (NWs) form a basis for studying interesting quantum phenomena and provide an exciting platform for various device applications, where in-depth understanding of the formation and electronic properties of ...

2020

Segregation scheme of indium in AlGaInAs nanowire shells

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Eleonora Russo, Martin George Friedl, Heidi Andrea Potts, Luca Francaviglia, Simon Robert Escobar Steinvall, Sara Marti Sanchez

2019

III–V Integration on Si(100): Vertical Nanospades

Anna Fontcuberta i Morral, Jean-Baptiste Leran, Lucas Güniat, Nicolas Tappy, Martin George Friedl, David Vindice, Luca Francaviglia, Megane Boscardin, Mahdi Zamani, Wonjong Kim, Sara Marti Sanchez, Akshay Balgarkashi, Oscar Garcia Garcia

2019

Increasing N content in GaNAsP nanowires suppresses the impact of polytypism on luminescence

Anna Fontcuberta i Morral, Luca Francaviglia

Cathodoluminescence (CL) and micro-photoluminescence spectroscopies are employed to investigate effects of structural defects on carrier recombination in GaNAsP nanowires (NWs) grown by molecular beam epitaxy on Si substrates. In the NWs with a low N conte ...

2019

Dataset for "Increasing N content in GaNAsP nanowires suppresses the impact of polytypism on luminescence"

Anna Fontcuberta i Morral, Luca Francaviglia

Cathodoluminescence (CL) and micro-photoluminescence spectroscopies are employed to investigate effects of structural defects on carrier recombination in GaNAsP nanowires (NWs) grown by molecular beam epitaxy on Si substrates. In the NWs with a low N conte ...

Zenodo2019

Mechanisms shifting the emission energy of self-assembled quantum dots in nanowires

Luca Francaviglia

This thesis is dedicated to the engineering of the emission energy of quantum dots embedded in core-shell GaAs-AlGaAs nanowires. The goal is to redshift the quantum-dot emission energy in resonance with a gas of Rb atoms. Segregation processes on the nanow ...

EPFL2019

Quantitative Nanoscale Absorption Mapping: A Novel Technique To Probe Optical Absorption of Two-Dimensional Materials

Andras Kis, Anna Fontcuberta i Morral, Dumitru Dumcenco, Luca Francaviglia, Marco Negri

Two-dimensional semiconductors, in particular transition metal dichalcogenides and related heterostructures, have gained increasing interest as they constitute potential new building blocks for the next generation of electronic and optoelectronic applicati ...

American Chemical Society (ACS)2019

Photophysics behind highly luminescent two-dimensional hybrid perovskite (CH3(CH2)2NH3)2(CH3NH3)2Pb3Br10 thin films

Anna Fontcuberta i Morral, Luca Francaviglia, Pablo Romero Gómez

Two-dimensional (2D) Ruddlesden–Popper perovskites have emerged as a new class of hybrid materials with high photoluminescence and improved stability compared to their three-dimensional (3D) counterparts. Studies of the photophysics of these new 2D perovsk ...

Royal Society of Chemistry2018

Imaging Stray Magnetic Field of Individual Ferromagnetic Nanotubes

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Jean-Baptiste Leran, Lucas Güniat, Dirk Grundler, Reza Zamani, Jelena Vukajlovic Plestina, Martin George Friedl, Heidi Andrea Potts, Luca Francaviglia, Nicola Rossi, Wonjong Kim, Vladimir Dubrovskii

American Chemical Society (ACS)2018

Optimizing the yield of A-polar GaAs nanowires to achieve defect-free zinc blende structure and enhanced optical functionality

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Jean-Baptiste Leran, Lucas Güniat, Martin George Friedl, Heidi Andrea Potts, Luca Francaviglia, Edoardo Markov, Mahdi Zamani, Lea Ghisalberti, Wonjong Kim, Sara Marti Sanchez, Vladimir Dubrovskii

2018

Bi-stability of contact angle and its role in tuning the morphology of self-assisted GaAs nanowires

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Jean-Baptiste Leran, Lucas Güniat, Jelena Vukajlovic Plestina, Martin George Friedl, Heidi Andrea Potts, Luca Francaviglia, Wonjong Kim, Vladimir Dubrovskii

We demonstrate the existence of two stable contact angles for the gallium droplet on top of self-assisted GaAs nanowires grown by MBE on patterned silicon substrates. Contact angle around 130 degrees fosters a continuous increase in the nanowire radius, wh ...

IEEE2018

Bistability of Contact Angle and Its Role in Achieving Quantum-Thin Self-Assisted GaAs nanowires

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Jean-Baptiste Leran, Lucas Güniat, Jelena Vukajlovic Plestina, Martin George Friedl, Heidi Andrea Potts, Luca Francaviglia, Wonjong Kim, Vladimir Dubrovskii

American Chemical Society (ACS)2018

Tuning adatom mobility and nanoscale segregation by twin formation and polytypism

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Federico Matteini, Luca Francaviglia

Nanoscale variations in the composition of an AlxGa1−xAs shell around a GaAs nanowire affect the nanowire functionality and can lead to the formation of localized quantum emitters. These composition fluctuations can be the consequence of variations of crys ...

2018

Dopant-Induced Modifications of GaxIn(1-x)P Nanowire-Based p-n Junctions Monolithically Integrated on Si(111)

Kirsten Emilie Moselund, Anna Fontcuberta i Morral, Heike Riel, Rolf Erni, Luca Francaviglia, Nicolas Bologna

Today, silicon is the most used material in photovoltaics, with the maximum conversion efficiency getting very close to the Shockley-Queisser limit for single-junction devices. Integrating silicon with higher band-gap ternary III-V absorbers is the path to ...

2018

Anisotropic-Strain-Induced Band Gap Engineering in Nanowire-Based Quantum Dots

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Lucas Güniat, Jelena Vukajlovic Plestina, Martin George Friedl, Heidi Andrea Potts, Luca Francaviglia, Andrea Giunto, Wonjong Kim, Pablo Romero Gómez

American Chemical Society (ACS)2018

Dataset for "Tuning adatom mobility and nanoscale segregation by twin formation and polytypism"

Anna Fontcuberta i Morral, Federico Matteini, Luca Francaviglia

Nanoscale variations in the composition of an AlxGa1−xAs shell around a GaAs nanowire affect the nanowire functionality and can lead to the formation of localized quantum emitters. These composition fluctuations can be the consequence of variations of crys ...

Zenodo2018

Nanoporous silicon tubes: the role of geometry in nanostructure formation and application to light emitting diodes

Anna Fontcuberta i Morral, Jelena Vukajlovic Plestina, Francesca Amaduzzi, Heidi Andrea Potts, Luca Francaviglia

Obtaining light emission from silicon has been the holy grail of optoelectronics over the last few decades. One of the most common methods for obtaining light emission from silicon is to reduce it to a nanoscale structure, for example by producing porous s ...

Institute of Physics2017