Publications de Lucas Güniat | EPFL Graph Search

Selective area epitaxy of GaAs: the unintuitive role of feature size and pitch

Anna Fontcuberta i Morral, Lucas Güniat, Martin George Friedl, Nicholas Paul Morgan, Akshay Balgarkashi, Didem Dede, Elif Nur Dayi, Valerio Piazza, Vladimir Dubrovskii

Selective area epitaxy (SAE) provides the path for scalable fabrication of semiconductor nanostructures in a device-compatible configuration. In the current paradigm, SAE is understood as localized epitaxy, and is modelled by combining planar and self-asse ...

IOP Publishing Ltd2022

Spatial Modulation of Vibrational and Luminescence Properties of Monolayer MoS & x2082; Using a GaAs Nanowire Array

Anna Fontcuberta i Morral, Jean-Baptiste Leran, Lucas Güniat, Wonjong Kim, Akshay Balgarkashi, Didem Dede, Valerio Piazza, Mirjana Dimitrievska

The integration of transition-metal dichalcogenides (TMDs) with non-planar substrates such as nanopillars provides a way to spatially modify the optical properties mainly through the localized strain. Similar studies to date have utilized insulating SiO2 n ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2022

Nanopillars Enabling III-V Integration on Si (100) and (111)

Lucas Güniat

The majority of current semiconductor technologies are built on Si (100), such as the CMOS technology, or conventional solar cell devices. III-V semiconductors offer great perspectives given their high carrier mobility and direct band gap. However their in ...

EPFL2021

Doping challenges and pathways to industrial scalability of III–V nanowire arrays

Anna Fontcuberta i Morral, Lucas Güniat, Wonjong Kim, Valerio Piazza

Semiconductor nanowires (NWs) have been investigated for decades, but their application into commercial products is still difficult to achieve, with triggering causes related to the fabrication cost and structure complexity. Dopant control at the nanoscale ...

2021

Simultaneous Selective Area Growth of Wurtzite and Zincblende Self-Catalyzed GaAs Nanowires on Silicon

Anna Fontcuberta i Morral, Lucas Güniat, Wonjong Kim, Valerio Piazza, Vladimir Dubrovskii

Selective area epitaxy constitutes a mainstream method to obtain reproducible nanomaterials. As a counterpart, self-assembly allows their growth without costly substrate preparation, with the drawback of uncontrolled positioning. We propose a mixed approac ...

American Chemical Society (ACS)2021

Facet-driven formation of axial and radial In(Ga)As clusters in GaAs nanowires

Anna Fontcuberta i Morral, Jean-Baptiste Leran, Lucas Güniat, Nicolas Tappy, Martin George Friedl, Wonjong Kim, Santhanu Panikar Ramanandan, Akshay Balgarkashi, Didem Dede

Embedding quantum dots in nanowires (NWs) constitutes one promising building block for quantum photonic technologies. Earlier attempts to grow InAs quantum dots on GaAs nanowires were based on the Stranski-Krastanov growth mechanism. Here, we propose a nov ...

2020

Remote Doping of Scalable Nanowire Branches

Anna Fontcuberta i Morral, Lucas Güniat, Martin George Friedl, Nicholas Paul Morgan, Wonjong Kim, Didem Dede

Selective-area epitaxy provides a path toward high crystal quality, scalable, complex nanowire networks. These high-quality networks could be used in topological quantum computing as well as in ultrafast photodetection schemes. Control of the carrier densi ...

2020

Facet-driven formation of axial and radial In(Ga)As clusters in GaAs nanowires

Anna Fontcuberta i Morral, Jean-Baptiste Leran, Lucas Güniat, Nicolas Tappy, Martin George Friedl, Nicholas Paul Morgan, Wonjong Kim, Santhanu Panikar Ramanandan, Akshay Balgarkashi, Didem Dede

Raw dataset and image files used for the publication ...

2020

Impact of oxygen content in powders on the morphology of the laser molten tracks in preparation for additive manufacturing of silicon

Patrik Willi Hoffmann, Lucas Güniat, Marc Leparoux

Powder additive pulsed Nd:YAG laser (wavelength 1064 nm), with the aim of preparing AM of such material. The influence of oxygen content in the initial silicon powders on the continuous tracks morphology was investigated. It was found that the initial oxyg ...

ELSEVIER2020

Vapor Phase Growth of Semiconductor Nanowires: Key Developments and Open Questions

Anna Fontcuberta i Morral, Lucas Güniat

Nanowires are filamentary crystals with a tailored diameter that can be obtained using a plethora of different synthesis techniques. In this review, we focus on the vapor phase, highlighting the most influential achievements along with a historical perspec ...

AMER CHEMICAL SOC2019

Questioning liquid droplet stability on nanowire tips: from theory to experiment

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Lucas Güniat, Martin George Friedl, Heidi Andrea Potts, William Craig Carter, Mahdi Zamani, Lea Ghisalberti

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

Template-Assisted Scalable Nanowire Networks

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Lucas Güniat, Martin George Friedl, Heidi Andrea Potts, Mahdi Zamani, Wonjong Kim, Sara Marti Sanchez, Vladimir Dubrovskii

Topological qubits based on Majorana Fermions have the potential to revolutionize the emerging field of quantum computing by making information processing significantly more robust to decoherence. Nanowires are a promising medium for hosting these kinds of ...

American Chemical Society (ACS)2018

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

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

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