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Anna Fontcuberta i Morral

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Publications associées (286)

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Fundamental aspects to localize self-catalyzed III-V nanowires on silicon

Anna Fontcuberta i Morral, Martin George Friedl, Wonjong Kim, Heidi Andrea Potts, Jelena Vukajlovic Plestina, Lea Ghisalberti, William Craig Carter

III-V semiconductor nanowires deterministically placed on top of silicon electronic platform would open many avenues in silicon-based photonics, quantum technologies and energy harvesting. For this to become a reality, gold-free site-selected growth is nec ...

Nature Research2019

III-V nanowire arrays: growth and light interaction

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Martin Heiss, Federico Matteini, Eleonora Russo, Sonia Conesa Boj, Esther Alarcon Llado, Anna Dalmau Mallorquí

Semiconductor nanowire arrays are reproducible and rational platforms for the realization of high performing designs of light emitting diodes and photovoltaic devices. In this paper we present an overview of the growth challenges of III-V nanowire arrays o ...

Institute of Physics2014

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

Synthesis, Morphological, and Electro-optical Characterizations of Metal/Semiconductor Nanowire Heterostructures

Anna Fontcuberta i Morral, Heidi Andrea Potts, Sonia Conesa Boj

In this letter, we demonstrate the formation of unique Ga/GaAs/Si nanowire heterostructures, which were successfully implemented in nanoscale light-emitting devices with visible room temperature electroluminescence. Based on our recent approach for the int ...

American Chemical Society2016

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

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

Magnetization reversal in individual Py and CoFeB nanotubes locally probed via anisotropic magnetoresistance and anomalous Nernst effect

Anna Fontcuberta i Morral, Dirk Grundler

Using anisotropic magnetoresistance in a multi-probe configuration and local heating with a scanning laser, we investigate the magnetization reversal of individual permalloy (Py) and CoFeB nanotubes with spatial resolution. Nanocrystalline Py and amorphous ...

AIP American Institute of Physics2016

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

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

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

Multiple Nanowire Species Synthesized on a Single Chip by Selectively Addressable Horizontal Nanochannels

Anna Fontcuberta i Morral

The synthesis of horizontal porous anodic alumina (PAA) structures with individually addressable channel systems is demonstrated. This was achieved by developing a multicontact design of aluminum finger structures (two to Five contacts) on silicon wafers. ...

American Chemical Society2010

Growth of nanowire arrays from micron-feature templates

Gaëtan Bernard, Anna Fontcuberta i Morral, Wonjong Kim, Martin George Friedl, Lea Ghisalberti, Dmitry Mikulik, Pablo Romero Gómez, William Craig Carter

Here, we present a two-step annealing procedure to imprint nanofeatures on SiO2 starting from metallic microfeatures. The first annealing transforms the microfeatures into gold nanoparticles and the second imprints these nanoparticles into the SiO2 layer w ...

2019

Direct and integrating sampling in terahertz receivers from wafer-scalable InAs nanowires

Anna Fontcuberta i Morral, Victor Carle Adrien Boureau, Didem Dede, Nicholas Paul Morgan, Valerio Piazza

Terahertz (THz) radiation will play a pivotal role in wireless communications, sensing, spectroscopy and imaging technologies in the decades to come. THz emitters and receivers should thus be simplified in their design and miniaturized to become a commodit ...

Nature Research2024

Self-assembled quantum dots in a nanowire system for quantum photonics

Nicola Marzari, Anna Fontcuberta i Morral, Marco Cantoni, Martin Heiss, Eleonora Russo, Sonia Conesa Boj, Yannik Fontana, Bernt Ketterer

Quantum dots embedded within nanowires represent one of the most promising technologies for applications in quantum photonics. Whereas the top-down fabrication of such structures remains a technological challenge, their bottom-up fabrication through self-a ...

Nature Publishing Group2013

Surfactant behavior and limited incorporation of indium during in situ doping of GeSn grown by molecular beam epitaxy

Thomas Hagger, Anna Fontcuberta i Morral, Andrea Giunto

GeSn is a promising group-IV semiconductor material for on-chip Si photonics devices and high-mobility transistors. These devices require the use of doped GeSn regions, achieved preferably in situ during epitaxy. From the electronic valence point of view, ...

AMER PHYSICAL SOC2023

Dataset for "GaAs nanowires on Si nanopillars: towards large scale, phase-engineered arrays"

Anna Fontcuberta i Morral, Wonjong Kim, Jean-Baptiste Leran, Didem Dede, Nicholas Paul Morgan, Akshay Balgarkashi, Lea Ghisalberti, William Craig Carter

Large-scale patterning for vapor-liquid-solid growth of III-V nanowires is a challenge given the required feature size for patterning (45 to 60 nm holes). In fact, arrays are traditionally manufactured using electron-beam lithography,for which processing t ...

Zenodo2022

Functional carbon nanosheets prepared from hexayne amphiphile monolayers at room temperature

Anna Fontcuberta i Morral, Anne-Clémence Corminboeuf, Emad Oveisi, Holger Frauenrath, Javier Reguera Gomez, Stephen Schrettl, Riccardo Petraglia, Yannik Fontana, Guillaume Pasche

Carbon nanostructures that feature two-dimensional extended nanosheets are important components for technological applications such as high-performance composites, lithium-ion storage, photovoltaics and nanoelectronics. Chemical functionalization would ren ...

Nature Publishing Group2014

Strain induced lifting of the charged exciton degeneracy in monolayer MoS2 on a GaAs nanomembrane

Anna Fontcuberta i Morral, Didem Dede, Valerio Piazza, Akshay Balgarkashi, Mitali Banerjee

Strain is a commonly used tool to tune the optoelectronic properties of semiconductors. It is especially effective for transition metal dichalcogenides (TMDs), which can withstand extreme strain up to 10%. To date, localised strain fields have been applied ...

IOP Publishing Ltd2022

Optical properties and carrier dynamics in Co-doped ZnO nanorods

Anna Fontcuberta i Morral, Simon Robert Escobar Steinvall, Nicolas Tappy

The controlled modification of the electronic properties of ZnO nanorods via transition metal doping is reported. A series of ZnO nanorods were synthesized by chemical bath growth with varying Co content from 0 to 20 atomic% in the growth solution. Optoele ...

ROYAL SOC CHEMISTRY2021

Efficient Multiterminal Spectrum Splitting via a Nanowire Array Solar Cell

Anna Fontcuberta i Morral, Esther Alarcon Llado

Nanowire-based solar cells opened a new avenue for increasing conversion efficiency and rationalizing material use by growing different III-V materials on silicon substrates. Here, we propose a multiterminal nanowire solar cell design with a theoretical co ...

Amer Chemical Soc2015

Effects of surface oxide formation on germanium nanowire band-edge photoluminescence

Anna Fontcuberta i Morral

The effect of intentional surface oxide formation on band-edge photoluminescence (PL) of Ge nanowires was investigated. Thermal oxidation in molecular O-2 was used to produce a surface oxide layer on assemblies of single crystal nanowires grown by the vapo ...

American Institute of Physics2013

Long range epitaxial growth of prismatic heterostructures on the facets of catalyst-free GaAs nanowires

Anna Fontcuberta i Morral, Sonia Conesa Boj

Molecular beam epitaxy is used for the synthesis of catalyst-free GaAs nanowires and related quantum heterostructures. After growth of the nanowire GaAs core, the conditions are changed in situ towards standard MBE planar growth in order to obtain quantum ...

Royal Society of Chemistry2009

Photonic-Plasmonic Coupling of GaAs Single Nanowires to Optical Nanoantennas

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Eleonora Russo, Federico Matteini, Martin Heiss, Alberto Casadei

We successfully demonstrate the plasmonic coupling between metal nanoantennas and individual GaAs nanowires (NWs). In particular, by using dark-field scattering and second harmonic excitation spectroscopy in partnership with analytical and full-vector FDTD ...

American Chemical Society2014