Applied Physics Letters · 2014 · 27 citations · 34 references
Natural SciencesChemistryPhysicsCondensed Matter PhysicsSemiconductor MaterialsSpectroscopyOptical Properties Of SemiconductorsOptical SpectroscopyOrganic SemiconductorsSemiconductor PhysicsTerahertz PhotonicsTerahertz SpectroscopyCarrier DynamicsCarrier Recombination DynamicsCarrier Transport In Organic SemiconductorsCharge Carrier DynamicsIntermolecular VibrationsOptical ConductivityPhotocarrier DynamicsUltrafast Carrier Dynamics
Carrier dynamics of an organic molecular semiconductor, rubrene, was investigated by optical-pump terahertz-probe spectroscopy from 1 to 15 THz. At 294 K, a Drude-like response due to photogenerated hole carriers is observed below 8 THz. The real part σ1(ω) of the optical conductivity is suppressed below 2 THz, indicating the presence of a localization effect. Such a spectral feature was reproduced by a Drude-Anderson model including the effect of dynamical disorder due to intermolecular vibrations. At 50 K, the spectral weight of σ1(ω) due to photocarriers shifts to lower frequency below 4 THz and the suppression of σ1(ω) is hardly observed, which we associate with a reduction of thermal molecular motions. The overall photocarrier generation and recombination dynamics is also discussed.
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Intrinsic Charge Transport on the Surface of Organic Semiconductors
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Terahertz emission from ultrafast ionizing air in symmetry-broken laser fields
Ki‐Yong Kim, J. H. Glownia, Antoinette J. Taylor et al. · Optics Express · 2007 · 689 citations · Full text