Publications de Marie-Noëlle Bussac

Hopping and trapping mechanisms in organic field-effect transistors

Libero Zuppiroli, Marie-Noëlle Bussac, Steven Konezny

A charge carrier in the channel of an organic field-effect transistor (OFET) is coupled to the electric polarization of the gate in the form of a surface Fröhlich polaron [N. Kirova and M. N. Bussac, Phys. Rev. B 68, 235312 (2003)]. We study the effects of ...

2010

Trap-limited transport in rubrene transistors

Libero Zuppiroli, Marie-Noëlle Bussac, Steven Konezny

The charge carrier mobility in the transport channel of an organic transistor is estimated within the framework of a trap-and-release model. The model accounts for the observed dependence of the mobility on the dielectric constant "epsilon" of the gate ins ...

AIP American Institute of Physics2009

Charge transport mechanisms in microcrystalline silicon

Libero Zuppiroli, Marie-Noëlle Bussac, Steven Konezny

A heterogeneous charge transport model for microcrystalline silicon based on fluctuation-induced tunneling is presented that fits the low-temperature saturation observed in dark conductivity measurements and accounts for the film microstructure. Excellent ...

AIP American Institute of Physics2008

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

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

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

Ultrathin organic transistors on oxide surfaces

Frank Nüesch, Libero Zuppiroli, Marie-Noëlle Bussac, Adrian von Mühlenen

We have built a model organic field-effect transistor that is basically composed of a single layer of pentacene crystal in interaction with an oxide surface. Drain and source contacts are ohmic so that the pentacene layer can carry a current density as hig ...

Deutsche Physikalische Gesellschaft & IOP Publishing Ltd2005