Marie-Noëlle Bussac

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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 ...

MOLED solves the dynamics of electrons and holes in multilayer organic light emitting diodes (OLED). The carriers are injected on the positive and negative electrodes of the device by tunneling through a potential barrier. Thermal excitation processes across the barrier are also included. In the interior of the device the electron-hole recombination occurs when the two carriers are close enough, according to a model inspired from the one of Langevin. A fraction of these recombined pairs gives photons. The c

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 ...

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 ...

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 ...

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 ...

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 ...

In a molecular semiconductor, a charged molecule experiences a lattice relaxation which reorganizes it into a cation or an anion-radical. This species is not, in general, a polaron. By using calculations of the geometry and the electronic structure both ab initio and at the semi-empirical levels, we have explored the conditions of polaron formation in a molecular model system: oligophenylene-vinylenes, PVs of increasing sizes. The symmetry breaking occurs at sizes larger than five monomers for the anion and

In a molecular semiconductor, the carrier is dressed with a polarization cloud that we treat as a quantum field of Frenkel excitons coupled to it. The consequences of the existence of this electronic polaron on the dynamics of an extra charge in a material like pentacene can thus be evaluated

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 ...

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 ...

Le Traité de la lumière se présente à la fois comme un livre de science et un livre d’art. En cultivant cette double allégeance, les auteurs ont cherché à exorciser les aspects les plus durs de la technoscience d’aujourd’hui. Or la lumière se prête bien à cet exercice car elle est source de toute vie et de toute énergie; à la manière des divinités hindouistes, elle se présente à l’homme sous de nombreux avatars dont chacun s’enrichit de multiples sens scientifiques et métaphoriques. La première partie de l'

Marie-Noëlle Bussac

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

MOLED: simulation of multilayer organic light emitting diodes

Quantum coherence and carriers mobility in organic semiconductors

Ultrathin organic transistors on oxide surfaces

Thermopower measurements on pentacene transistors

Hopping and trapping mechanisms in organic field-effect transistors

Trap-limited transport in rubrene transistors

Polaron formation and symmetry breaking

The impact of molecular polarization on the electronic properties of molecular semiconductors

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

Charge transport mechanisms in microcrystalline silicon

Traité de la lumière