From polarized reflection spectra of TEA(TCNQ), single crystals at room temperature, quantitative values of the complex dielectric function ~( w ) and the optical conductivity a(w) in the range from the far infrared to the ultraviolet have been derived. The polarization of the vibrational bands almost exclusively parallel to the highly conducting direction suggests strong interaction of conduction electrons with intramolecular TCNQ vibrations.An Eirikristallen des hoch anisotropen organischen Halbleiters TEA(TCNQ), wurden bei Zimmertemperatur die polarisierten Reflexionsspektren vom fernen Infrarot bis ins Ultraviolett gemessen. Daraus wurden die kornplexe Dielektrizitatskonstante E ( W ) sonie die optische Leitfahigkeit a(w) bestimnit. Die beobachteten Vibrationsbanden sind fast ausschlieBlich parallel zur Richtung hoher Leitfahigkeit polarisiert. Das ist ein Hinweis dafiir, daI3 die Leitungselektronen ruit den intramolekularen TCNQ-Schningungen stark gekoppelt sind.

No abstract

Measurements of the thermal diffusivity D on crystals of the highly anisotropic organic semiconductor TEA(TCNQ)? are reported. These measurements are made using a heat pulse method. For the crystal axis 1 parallel to the TCNQ columns and associated with the largest component a, of the electrical conductivity, D, is 1.6 x om2 8-l a t 200 R. The thermal conductivity k, is evaluated to 4 mW cm-' K-I a t 300 K with an estimated electronic contribution of only 1%. The phonon mean free path at 300K is extremely small I, e 2 A, of the order of the shortest distance between the TCNQ molecules in a column. It is thus expcctcd to be almost constant a t this temperature, a result, which is also suggested from the observed T dependence of D,.

No abstract

No abstract