Publications by Wonjong Kim | EPFL Graph Search

Thermal Rectification in Telescopic Nanowires: Impact of Thermal Boundary Resistance

A thermal diode, which, by analogy to its electrical counterpart, rectifies heat current, is the building block for thermal circuits. To realize a thermal diode, we demonstrate thermal rectification in a GaAs telescopic nanowire system using the thermal br ...

2025

Generation of Human iPSC-Derived Neurons on Nanowire Arrays Featuring Varying Lengths, Pitches, and Diameters

Anna Fontcuberta i Morral, Wonjong Kim

Nanowire (NW) arrays interfaced with biological cells have been demonstrated to be potent tools for advanced applications such as sensing, stimulation, or drug delivery. Many implementations, however, have so far only been studied with rather robust basic ...

WILEY2022

Generation of Human iPSC‐Derived Neurons on Nanowire Arrays Featuring Varying Lengths, Pitches, and Diameters (Adv. Mater. Interfaces 24/2022)

Anna Fontcuberta i Morral, Wonjong Kim

Generation of Human iPSC-Derived Neurons on Nanowire Arrays Human induced pluripotent stem cells (iPSCs) are used to generate functional neurons while being cultured on nanowire arrays. The variation of the substrate geometries such as nanowire length and ...

Wiley2022

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

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

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

Nanoscale Mapping of Light Emission in Nanospade-Based InGaAs Quantum Wells Integrated on Si(100): Implications for Dual Light-Emitting Devices

Anna Fontcuberta i Morral, Jean-Baptiste Leran, Nicolas Tappy, Nicholas Paul Morgan, Raphaël François Lemerle, Wonjong Kim, Akshay Balgarkashi, Titouan Charvin, Didem Dede, Valerio Piazza

III-V semiconductors outperform Si in many optoelectronics applications due to their high carrier mobility, efficient light emission and absorption processes, and the possibility to engineer their band gap through alloying. However, complementing Si techno ...

2022

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

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

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 ...

2022

Accompanying dataset to ACS Appl. Nano Mater. 2022, 5, 4, 5508–5515 : Nanoscale Mapping of Light Emission in Nanospade-Based InGaAs Quantum Wells Integrated on Si(100): Implications for Dual Light-Emitting Devices

Anna Fontcuberta i Morral, Jean-Baptiste Leran, Nicolas Tappy, Nicholas Paul Morgan, Raphaël François Lemerle, Wonjong Kim, Akshay Balgarkashi, Didem Dede, Valerio Piazza

Accompanying dataset containing the raw data and analysis contained in the main publication. This comprises the fitted CL-SEM dataset, the CL-STEM dataset, the CL-SEM presented in the SI and the STEM-EDX linescans. ...

Zenodo2022

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

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

Increasing Functionality of III-V Nanowires on Silicon Substrates

Wonjong Kim

Progress in nanotechnology, including fabrication and characterization tools, opened up the unprecedented low dimensional materials era, where we can manipulate and structure matter on a size scale that we could not reach before. Due to many interesting pr ...

EPFL2020

Measuring the Optical Absorption of Single Nanowires

Anna Fontcuberta i Morral, Wonjong Kim, Simon Robert Escobar Steinvall

In this work we present a method to quantitatively measure the optical absorption of single nanowires that can be applied over a wide range of temperatures and with a high enough sensitivity to enable the measurement of below-band-gap absorption (as well a ...

American Physical Society (APS)2020

Time-resolved open-circuit conductive atomic force microscopy for direct electromechanical characterisation

Anna Fontcuberta i Morral, Jelena Vukajlovic Plestina, Wonjong Kim

Studying nanomaterial piezoelectricity and triboelectricity is attractive for energy and sensing applications. However, quantitative characterisation of electromechanical effects in nanomaterials is challenging due to practical limitations and possible com ...

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

Dataset for "Measuring the Optical Absorption of Single Nanowires"

Anna Fontcuberta i Morral, Wonjong Kim, Simon Robert Escobar Steinvall

In this work we present a method to quantitatively measure the optical absorption of single nanowires that can be applied over a wide range of temperatures and with a high enough sensitivity to enable the measurement of below-band-gap absorption (as well a ...

Zenodo2020

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

Does desorption affect the length distributions of nanowires?

Anna Fontcuberta i Morral, Jelena Vukajlovic Plestina, Wonjong Kim, Vladimir Dubrovskii

State-of-the art models for statistical properties within the nanowire ensembles consider influx of precursors, reflection and surface diffusion of adatoms. These models predict a delay in the nanowire growth start and the evolution toward an asymmetric le ...

2019

Dataset for "Does desorption affect the length distributions of nanowires?"

Anna Fontcuberta i Morral, Jelena Vukajlovic Plestina, Wonjong Kim

State-of-the art models for statistical properties within the nanowire ensembles consider influx of precursors, reflection and surface diffusion of adatoms. These models predict a delay in the nanowire growth start and the evolution toward an asymmetric le ...

Zenodo2019

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