Publications de Esther Alarcon Llado

Publications associées (26)

Efficient Photovoltaic Current Generation at Ferroelectric Domain Walls

We elucidate the mechanism of a newly observed photovoltaic effect which occurs in ferroelectrics with periodic domain structures. Under sufficiently strong illumination, domain walls function as nanoscale generators of the photovoltaic current. The steps ...

2011

Nanowire-Aperture Probe: Local Enhanced Fluorescence Detection for the Investigation of Live Cells at the Nanoscale

Anna Fontcuberta i Morral, Esther Alarcon Llado

Fluorescence microscopy has tackled many of the burning questions in cellular biology. Probing low-affinity cellular interactions remains one of the major challenges in the field to better understand cellular signaling. We introduce a novel approach the na ...

Amer Chemical Soc2016

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

Surface origin and control of resonance Raman scattering and surface band gap in indium nitride

Esther Alarcon Llado

Resonance Raman scattering measurements were performed on indium nitride thin films under conditions where the surface electron concentration was controlled by an electrolyte gate. As the surface condition is tuned from electron depletion to accumulation, ...

Iop Publishing Ltd2016

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

Polarization response of nanowires a la carte

Anna Fontcuberta i Morral, Eleonora Russo, Esther Alarcon Llado, Martin Heiss, Francesca Amaduzzi, Alberto Casadei

Thanks to their special interaction with light, semiconductor nanowires have opened new avenues in photonics, quantum optics and solar energy harvesting. One of the major challenges for their full technological deployment has been their strong polarization ...

Nature Publishing Group2015

Field-effect passivation on silicon nanowire solar cells

Anna Fontcuberta i Morral, Stefaan De Wolf, Esther Alarcon Llado, Bénédicte Demaurex, Anna Dalmau Mallorquí

Surface recombination represents a handicap for high-efficiency solar cells. This is especially important for nanowire array solar cells, where the surface-to-volume ratio is greatly enhanced. Here, the effect of different passivation materials on the effe ...

Tsinghua Univ Press2015

Electrical transport in C-doped GaAs nanowires: surface effects

Anna Fontcuberta i Morral, Eleonora Russo, Martin Heiss, Esther Alarcon Llado, Alberto Casadei, Fauzia Jabeen

The resistivity and mobility of carbon-doped GaAs nanowires have been studied for different doping concentrations. Surface effects have been evaluated by comparing unpassivated with passivated nanowires. We directly see the influence of the surface: the pi ...

Wiley-Blackwell2013

Tuning the response of non-allowed Raman modes in GaAs nanowires

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Federico Matteini, Esther Alarcon Llado, Emanuele Uccelli, Francesca Amaduzzi

We report on the use of photonic resonances in Raman spectroscopy on single nanowires for the enhancement of forbidden modes and the study of the interaction of phonons with free-carriers. This is achieved by suspending nanowire over a trench and detecting ...

Iop Publishing Ltd2016

Nanoscale Probing of High Photovoltages at 109 degrees Domain Walls

Esther Alarcon Llado

We report the direct observation of nanoscale photovoltaic current-voltage properties associated with directional steps of the electrostatic potential at 109 degrees domain walls in ferroelectric BiFeO3 thin films with highly ordered ferroelectric stripe d ...

Taylor & Francis Ltd2012

From Twinning to Pure Zincblende Catalyst-Free InAs(Sb) Nanowires

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Martin George Friedl, Heidi Andrea Potts, Esther Alarcon Llado, Federico Matteini, Francesca Amaduzzi

III-V nanowires are candidate building blocks for next generation electronic and optoelectronic platforms. Low bandgap semiconductors such as In As and InSb are interesting because of their high electron mobility. Fine control of the structure, morphology, ...

American Chemical Society2016

Visual Understanding of Light Absorption and Waveguiding in Standing Nanowires with 3D Fluorescence Confocal Microscopy

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Federico Matteini, Esther Alarcon Llado

Semiconductor nanowires are promising building blocks for next generation photonics. Indirect proofs of large absorption cross sections have been reported in nanostructures with subwavelength diameters, an effect that is even more prominent in vertically s ...

Amer Chemical Soc2017

Rational strain engineering in delafossite oxides for highly efficient hydrogen evolution catalysis in acidic media

Anna Fontcuberta i Morral, Esther Alarcon Llado, Filip Mateusz Podjaski

The rational design of catalysts is crucial to make power-to-X technologies viable. Here the authors introduce the delafossite PdCoO2 as a highly active hydrogen evolution reaction catalyst due to the growth of a tensile-strained Pd-rich capping layer unde ...

NATURE PUBLISHING GROUP2020

Ga-assisted growth of GaAs nanowires on silicon, comparison of surface SiOx of different nature

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Federico Matteini, Esther Alarcon Llado

Physical properties of surfaces are extremely important for initiation and nucleation of crystal growth, including nanowires. In recent years, fluctuations in surface characteristics have often been related to unreproducible growth of GaAs nanowires on Si ...

Elsevier2014

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

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

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

Pathways to Electrochemical Solar-Hydrogen Technologies

Sophia Haussener, Corsin Battaglia, Esther Alarcon Llado, Miguel Antonio Modestino, Seyyed Mohammad Hosseini Hashemi, Jan-Willem Alexander Schüttauf, Enrico Chinello

2018

Modulation of Fluorescence Signals from Biomolecules along Nanowires Due to Interaction of Light with Oriented Nanostructures

Anna Fontcuberta i Morral, Esther Alarcon Llado

High aspect ratio nanostructures have gained increasing interest as highly sensitive platforms for biosensing. Here, well-defined biofunctionalized vertical indium arsenide nanowires are used to map the interaction of light with nanowires depending on thei ...

American Chemical Society2015

PN junction rectification in electrolyte gated Mg-doped InN

Esther Alarcon Llado

PN junction rectification is demonstrated in indium nitride. The junction is formed between the n-type surface accumulation layer and the Mg-doped, p-type bulk in a top-contacted thin film structure. The parasitic shorting path between the top contacts is ...

AIP American Institute of Physics2011

Understanding and exploiting optical properties in semiconductor nanowires for solar energy conversion

Eleonora Frau, Anna Fontcuberta i Morral, Federico Matteini, Esther Alarcon Llado, Heidi Andrea Potts

Semiconductor nanowires are promising building blocks for next generation solar energy conversion at low cost, due to their large absorption cross-sections. Here, the understanding of their absorption power is explored via computational and experimental me ...

IEEE2016

Growth mechanisms and process window for InAs V-shaped nanoscale membranes on Si[001]

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

Organized growth of high aspect-ratio nanostructures such as membranes is interesting for opto-electronic and energy harvesting applications. Recently, we reported a new form of InAs nano-membranes grown on Si substrates with enhanced light scattering prop ...

Institute of Physics2013