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Person

Federico Matteini

Federico pursued his Bachelor in Material Science at Universita' di Genova (Italy) in 2009. He spent one year at the Dublin Institute of Technology (Ireland), as exchange student in the frame of the EU Erasmus Lifelong Learning Programme.

In 2011 he obtained a Master degree in Chemical Engineering as a joint study agreement between

Universita' di Bologna (Italy), Universidad Politecnica de Valencia (Spain) and KTH Stokholm (Sweden), in the frame of the Erasmus Mundus Master Courses (IMMSSET).

He carried on his master thesiss project at Rice University (Houston, Texas).

After a short period as intern at DSM Material Science Center (the Netherlands), he joined the Laboratory of Semiconductor Materials of Prof. Fontcuberta i Morral at EPFL (Switzerland).

During his PhD he was awarded of a DocMobility grant to pursue his research at MIT, in the lab of Prof. W.C. Carter.

Graduated in 2016, he moved to fastree3D (3D vision startup) as product marketing manager to define target markets, associated strategy and positioning.

In 2018 he joined the large enterprises team at the Vice Presidency for Innovation as business developer.

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Biography

In 2011 he obtained a Master degree in Chemical Engineering as a joint study agreement between

Universita' di Bologna (Italy), Universidad Politecnica de Valencia (Spain) and KTH Stokholm (Sweden), in the frame of the Erasmus Mundus Master Courses (IMMSSET).

He carried on his master thesiss project at Rice University (Houston, Texas).

After a short period as intern at DSM Material Science Center (the Netherlands), he joined the Laboratory of Semiconductor Materials of Prof. Fontcuberta i Morral at EPFL (Switzerland).

During his PhD he was awarded of a DocMobility grant to pursue his research at MIT, in the lab of Prof. W.C. Carter.

Graduated in 2016, he moved to fastree3D (3D vision startup) as product marketing manager to define target markets, associated strategy and positioning.

In 2018 he joined the large enterprises team at the Vice Presidency for Innovation as business developer.

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Nanowire

A nanowire is a nanostructure in the form of a wire with the diameter of the order of a nanometre (10−9 metres). More generally, nanowires can be defined as structures that have a thickness or diam

Silicon

Silicon is a chemical element with the symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic luster, and is a tetravalent metalloid and semiconductor. It is

Raman spectroscopy

Raman spectroscopy (ˈrɑːmən) (named after Indian physicist C. V. Raman) is a spectroscopic technique typically used to determine vibrational modes of molecules, although rotational and other low-fre

In this article, the authors propose a novel illumination strategy for light detection and ranging (lidar) systems emitting in the retinal hazard region (400 m

AMER INST PHYSICS2018

Tuning adatom mobility and nanoscale segregation by twin formation and polytypism

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

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 crystal phase and/or nanoscale adatom mobility. By applying electron-microscopy-related techniques we correlate the optical, compositional and structural properties at the nanoscale on the same object. The results indicate a clear correlation between the twin density in the nanowire and the quantum-emitter density as well as a significant redshift in the emission. We propose that twinning increases nanoscale segregation effects in ternary alloys. An additional redshift in the emission can be explained by the staggered band alignment between wurtzite and zinc-blende phases. This work opens new avenues in the achievement of homogeneous ternary and quaternary alloys in nanowires and in the engineering of the segregation effects at the nanoscale.

2018

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

Esther Alarcon Llado, Anna Fontcuberta i Morral, Federico Matteini, Dmitry Mikulik, Maria Ricci, Gözde Tütüncüoglu, Jelena Vukajlovic Plestina, 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 configuration requires new schemes for the characterization. We show how conductive-probe atomic force microscopy, C-AFM, is an essential tool for the characterization and optimization of this parallel-connected nanowire devices. With C-AFM it is possible to obtain both surface topography and local electrical characterization with nanoscale resolution. We demonstrate topography and current mapping of nanowire forests, combined with current-voltage measurements of the individual nanowire junctions from the ensemble. Our results provide discussion elements on some factors limiting the performance of a nanowire-based solar cell and thereby to provide a path for their improvement.

Elsevier Science Bv2017

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