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Anna Fontcuberta i Morral

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Publications associées (286)

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

III-V nanowires on si for applications in photonics

Anna Fontcuberta i Morral

Nanowires are filamentary crystals with a tailored diameter ranging from few to ~100 nm. We demonstrate their integration on silicon and show how they enable/improve applications in the areas of lasing, photodetection and solar cells. ...

Optica Publishing Group (formerly OSA)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

Coherent Dynamics of Nanowire Force Sensors

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Nicola Rossi

We describe the use of grown nanowires as scanning directional force sensors. Two orthogonal flexural modes are used to demonstrate vectorial sensing of electric and magnetic fields. Furthermore, we show that the modes can be strongly coupled by demonstrat ...

IEEE2018

Managing the solar spectrum at sub-wavelength scales: nanowire enabled new PV concepts (Conference Presentation)

Anna Fontcuberta i Morral, Pablo Romero Gómez

III-V semiconductor nanowires (NWs) are promising building blocks for next generation solar energy conversion at low cost. NW ensembles constitute a new class of metamaterial, where the optical properties of the array are tuned by the individual NW type, g ...

SPIE2018

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

Zenodo2018

Imaging magnetic vortex configurations in ferromagnetic nanotubes

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Dirk Grundler

We image the remnant magnetization configurations of CoFeB and permalloy nanotubes (NTs) using x-ray magnetic circular dichroism photoemission electron microscopy. The images provide direct evidence for flux-closure configurations, including a global vorte ...

American Physical Society2017

Investigations of doping via optical pump terahertz-probe spectroscopy

Anna Fontcuberta i Morral, Alberto Casadei, Federico Matteini, Francesca Amaduzzi

Reliable doping in semiconductor nanowires is essential for the development of novel optoelectronic devices. Dopant incorporation within the nanowire can allow for optimisation of key optoelectronic properties, such as electron mobility and carrier lifetim ...

IEEE Computer Societyhelp@computer.org2017

Vectorial scanning force microscopy using a nanowire sensor

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Nicola Rossi

Self-assembled nanowire (NW) crystals can be grown into nearly defect-free nanomechanical resonators with exceptional properties, including small motional mass, high resonant frequency and low dissipation. Furthermore, by virtue of slight asymmetries in ge ...

Nature Publishing Group2017

Tilting Catalyst-Free InAs Nanowires by 3D-Twinning and Unusual Growth Directions

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Jean-Baptiste Leran, Martin George Friedl, Heidi Andrea Potts, Youri Louis Winandus Van Hees

Controlling the growth direction of nanowires is of strategic importance both for applications where nanowire arrays are contacted in parallel and for the formation of more complex nanowire networks. We report on the existence of tilted InAs nanowires on ( ...

American Chemical Society2017

Revealing Large-Scale Homogeneity and Trace Impurity Sensitivity of GaAs Nanoscale Membranes

Alessandro Surrente, Anna Fontcuberta i Morral, Philippe Leroux, Gözde Tütüncüoglu, Francesca Amaduzzi

III-V nanosttuctures have the potential to revolutionize optoelectronics and energy harvesting. For this to become a reality, critical issues such as reproducibility and sensitivity to defects should be resolved. By discussing the optical properties of mol ...

American Chemical Society2017

Metallized Boron-Doped Black Silicon Emitters For Front Contact Solar Cells

Anna Fontcuberta i Morral, Elias Zsolt Stutz

We study doping and metallization of black silicon (bSi) boron emitters formed by ion implantation or diffusion. We demonstrate that conformal metal layers can be deposited on bSi by electron beam evaporation. Raman spectroscopy shows that high boron conce ...

IEEE2017

Solution processed nanostructures towards efficient and low-cost water splitting

Anna Fontcuberta i Morral

Institute of Physics2017

Conductive-probe atomic force microscopy as a characterization tool for nanowire-based solar cells

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Maria Ricci, Esther Alarcon Llado, Federico Matteini, Jelena Vukajlovic Plestina, Dmitry Mikulik, Natasa Vulic

The photonic properties of nanowires advocate for their utilization in next generation solar cells. Compared to traditional devices, the electric scheme is transformed from a single into an ensemble of pn junctions connected in parallel. This new configura ...

Elsevier Science Bv2017

Tuning growth direction of catalyst-free InAs(Sb) nanowires with indium droplets

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Martin George Friedl, Heidi Andrea Potts, Nicholas Paul Morgan

The need for indium droplets to initiate self-catalyzed growth of InAs nanowires has been highly debated in the last few years. Here, we report on the use of indium droplets to tune the growth direction of self-catalyzed InAs nanowires. The indium droplets ...

Institute of Physics2017

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

Engineering the Size Distributions of Ordered GaAs Nanowires on Silicon

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Jelena Vukajlovic Plestina, Martin George Friedl, Heidi Andrea Potts, Maxime Lagier, Wonjong Kim

Reproducible integration of III-V semiconductors on silicon can open new path toward CMOS compatible optoelectronics and novel design schemes in next generation solar cells. Ordered arrays of nanowires could accomplish this task, provided they are obtained ...

2017

Surface passivation and self-regulated shell growth in selective area-grown GaN-(Ale,Ga)N core-shell nanowires

Anna Fontcuberta i Morral, Luca Francaviglia

The large surface-to-volume ratio of GaN nanowires implicates sensitivity of the optical and electrical properties of the nanowires to their surroundings. The implementation of an (Al, Ga) N shell with a larger band gap around the GaN nanowire core is a pr ...

Royal Society of Chemistry2017

Plasmonic Waveguide-Integrated Nanowire Laser

Anna Fontcuberta i Morral, Gözde Tütüncüoglu

Next-generation optoelectronic devices and photonic circuitry will have to incorporate on-chip compatible nanolaser sources. Semiconductor nanowire lasers have emerged as strong candidates for integrated systems with applications ranging from ultrasensitiv ...

American Chemical Society2017

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