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Libero Zuppiroli

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Publications associées (50)

Hybrid inorganic-organic photonic devices

Romuald Houdré, Libero Zuppiroli, Rolando Ferrini, Laurent Balet, Nicolas Le Thomas, Pascale El-Kallassi

We present the infiltration of semiconductor photonic devices with organic materials. The infiltration procedures are described and validated. In particular, the optical properties of hybrid photonic crystal cavities are studied. ...

EOS2008

Charge transport mechanisms in organic and microcrystalline silicon field-effect transistors

Libero Zuppiroli, Marie-Noëlle Bussac, Steven Konezny

Several organic and inorganic materials have emerged as promising candidates for the active layer of field-effect transistors (FETs) fabricated on flexible substrates. The charge transport models necessary for device optimization in these systems are at di ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2007

Quantum coherence and carriers mobility in organic semiconductors

Libero Zuppiroli, Marie-Noëlle Bussac, Jean-David Picon

We present a model of charge transport in organic molecular semiconductors based on the effects of lattice fluctuations on the quantum coherence of the electronic state of the charge carrier. Thermal intermolecular phonons and librations tend to localize p ...

2007

Optical tuning of planar photonic crystals infiltrated with organic molecules

Romuald Houdré, Libero Zuppiroli, Rolando Ferrini, Nicolas Le Thomas, Pascale El-Kallassi

The optical tuning of InP-based planar photonic crystals (PhCs) infiltrated with a photo-responsive liquid crystal system is presented. Photo-induced phase transitions of a liquid crystal blend doped with azobenzene molecules are used to tune the optical r ...

2007

Thermopower measurements on pentacene transistors

Libero Zuppiroli, Marie-Noëlle Bussac, Adrian von Mühlenen

We present the first thermoelectric measurements on pentacene field effect transistors. We report high values of the Seebeck coefficient at room temperature between 240 and 500 micro V/K depending on the dielectric surface treatment. These values are indep ...

2007

Tuneable planar photonic crystals

Romuald Houdré, Libero Zuppiroli, Rolando Ferrini, Barbara Wild, Liza Carol Andrea Dunbar

2006

Planar photonic crystals infiltrated with liquid crystals: tuning of the optical properties

Romuald Houdré, Libero Zuppiroli, Rolando Ferrini, Liza Carol Andrea Dunbar, Nicolas Le Thomas

2006

Planar photonic crystals infiltrated with liquid crystals: optical characterization of molecule orientation

Romuald Houdré, Libero Zuppiroli, Rolando Ferrini, Barbara Wild, Liza Carol Andrea Dunbar, Vasily Zabelin

Nematic liquid crystals are infiltrated into InP-based planar photonic crystals. Optical measurements as a function of temperature and polarization are used to study the average director field configuration in the nanometer-size holes: a planar equilibrium ...

Opt. Soc. America2006

Polarization effects in the channel of an organic field-effect transistor

Libero Zuppiroli, Marie-Noëlle Bussac, Jean-David Picon, Hocine Houili

We present the results of our calculation of the effects of dynamical coupling of a charge carrier to the electronic polarization and the field-induced lattice displacements at the gate interface of an organic field-effect transistor (OFET). We find that t ...

American Institute of Physics Inc.2006

Liquid crystal infiltration of InP-based planar photonic crystals

Romuald Houdré, Frank Nüesch, Libero Zuppiroli, Rolando Ferrini, Barbara Wild, Liza Carol Andrea Dunbar

A procedure for the infiltration of planar photonic crystals (PhCs) with liquid crystals (LCs) is presented. InP-based PhCs are infiltrated with the nematic LC-K15 in a specially designed high-vacuum chamber. The infiltration technique is validated and sys ...

AIP2006

Cubic and oriented Ag nano-particles by high vacuum evaporation

Libero Zuppiroli, Detlef Berner

Ag cubes of uniform size (70nm) and self-assembled into two dimensional arrays are formed by physical vapor deposition. The formation of the Ag cubes depends critically on the substrate composition. While heat dissipation can control the crystallization of ...

Nano Science and Technology Institute, Cambridge, MA 02139, United States2006

Charge transport across organic-organic interfaces in organic light-emitting diodes

Libero Zuppiroli, Eduard Tutis, Hocine Houili

The process of hopping transport across organic heterojunctions is critical to the function of organic light-emitting diodes (OLED) and many other currently developed organic electronic devices. We consider the case of a hole-only or homopolar heterojuncti ...

Elsevier2006

Investigation of the charge transport through disordered organic molecular heterojunctions

Libero Zuppiroli, Eduard Tutis, Hocine Houili

We present a three-dimensional multiparticle Monte Carlo (3DMPMC) simulation of hopping transport in disordered organic molecular media. We used this approach in order to study the charge transport across an energetically disordered organic molecular heter ...

AIP2006

Efficient blue light-emitting diodes based on a classical "push-pull" architecture molecule 4,4 prime -di-(2-(2,5- dimethoxyphenyl)ethenyl)-2,2 prime -bipyridine

Philippe Bugnon, Michael Graetzel, Mohammad Khaja Nazeeruddin, Libero Zuppiroli, Rosario Scopelliti, Detlef Berner, Mauro Castellani, Filippo de Angelis

A novel, highly blue luminescent molecule containing donor and acceptor groups, 4,4 prime -di-(2-(2,5-dimethoxyphenyl)ethenyl)-2,2 prime -bipyridine, that shows photoluminescence emission at 450 nm with 43% quantum yield is designed and synthesized. Time d ...

Royal Society of Chemistry2006

Counterion effects in cyanine heterojunction photovoltaic devices

Frank Nüesch, Libero Zuppiroli, Antonin Faes

We investigated cyanine heterojunction photovoltaic devices using carbocyanine dyes as donors and buckminsterfullerene (C60) as acceptor. In particular, we focused on the influence of cyanine counterions on the photovoltaic device characteristics. It was f ...

2005

Doping-induced charge trapping in organic light-emitting devices

Frank Nüesch, Libero Zuppiroli, Eduard Tutis, Detlef Berner, Xiao Wang

By using pyran-containing donor-acceptor dyes as doping molecules in organic light-emitting devices (OLEDs), we scrutinize the effects of charge trapping and polarization induced by the guest molecules in the electro-active host material. Laser dyes 4-(dic ...

Wiley-VCH2005

Comparison between nucleation of pentacene monolayer islands on polymeric and inorganic substrates

Frank Nüesch, Libero Zuppiroli

We present a comparative study of the nucleation and growth of pentacene monolayer islands in the submonolayer regime onto inorganic substrates of SiO2 and sapphire (Al2O3) and organic substrates of poly(methyl-metacrylate) ...

2005

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Libero Zuppiroli

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Hybrid inorganic-organic photonic devices

Charge transport mechanisms in organic and microcrystalline silicon field-effect transistors

Quantum coherence and carriers mobility in organic semiconductors

Optical tuning of planar photonic crystals infiltrated with organic molecules

Thermopower measurements on pentacene transistors

Tuneable planar photonic crystals

Planar photonic crystals infiltrated with liquid crystals: tuning of the optical properties

Planar photonic crystals infiltrated with liquid crystals: optical characterization of molecule orientation

Polarization effects in the channel of an organic field-effect transistor

Liquid crystal infiltration of InP-based planar photonic crystals

Cubic and oriented Ag nano-particles by high vacuum evaporation

Charge transport across organic-organic interfaces in organic light-emitting diodes

Investigation of the charge transport through disordered organic molecular heterojunctions

Efficient blue light-emitting diodes based on a classical "push-pull" architecture molecule 4,4 prime -di-(2-(2,5- dimethoxyphenyl)ethenyl)-2,2 prime -bipyridine

Counterion effects in cyanine heterojunction photovoltaic devices

Doping-induced charge trapping in organic light-emitting devices

Comparison between nucleation of pentacene monolayer islands on polymeric and inorganic substrates

Tuneable planar photonic crystals

Tuneable planar photonic crystal devices

Optical characterization of tunable planar photonic crystals