Infrared Absorption by Free Carriers in Quasi-One-Dimensional Organic Crystals of Tetrathiotetracene–Iodide

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Abstract:

The coefficient of long wave infrared (IR) absorption has been calculated at room temperature in quasi-one-dimensional organic crystals of TTT2I3 type (TTT is the tetrathiotetracene) as a function of radiation frequency ν in the interval from 1012 Hz to 1013 Hz. In this interval the lattice absorption is still weak. Two the most important interactions of carriers with acoustic phonons and the carriers scattering on impurities are taken into account. Calculations are made for different impurity concentrations and different contribution of each electron–phonon interaction. The dependences of α on radiation frequency ν and crystal parameters are analyzed and the possibility to evaluate the coupling constants of electron–phonon interactions and the degree of crystal purity from experimental measurements of α on ν is demonstrated.
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  • Journal of Nanoelectronics and Optoelectronics (JNO) is an international and cross-disciplinary peer reviewed journal to consolidate emerging experimental and theoretical research activities in the areas of nanoscale electronic and optoelectronic materials and devices into a single and unique reference source. JNO aims to facilitate the dissemination of interdisciplinary research results in the inter-related and converging fields of nanoelectronics and optoelectronics.
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