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537.31 (72) |
Electricitate curentă. Curent electric. Electrocinetică (90) |
SM ISO690:2012 KASIYAN, Anatolie, SANDULEAC, Ionel. Density of states for an electronic spectrum with a forbidden band. In: Journal of Engineering Sciences, 2020, vol. 27, nr. 3, pp. 33-37. ISSN 2587-3474. |
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Journal of Engineering Sciences | ||||||
Volumul 27, Numărul 3 / 2020 / ISSN 2587-3474 /ISSNe 2587-3482 | ||||||
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CZU: 537.31 | ||||||
JEL: 10.5281/zenodo.3949645 | ||||||
Pag. 33-37 | ||||||
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Rezumat | ||||||
Quasi-one-dimensional organic crystals with high electrical conductivity at room temperature are prospect materials for thermoelectric applications. However, usually at some low temperature these materials manifest metal-dielectric transition of Peierls type. The aim of this paper is to calculate the density of electronic states and to show that the metal-dielectric transition is determined by the appearance of a forbidden band in the electronic spectrum exactly above the Fermi energy. While decreasing the temperature T, this forbidden band becomes larger and at some T prevails the value of k0T, where k0 is the Boltzmann constant and the carriers cannot be exited across the forbidden band. This temperature corresponds to metal-dielectric transition. |
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Cuvinte-cheie electrical conductivity, quasi-one-dimensional materials, Organic compounds, thermoelectric figure of merit, thermoelectric converter, conductivitate electrică, materiale quasi-uni dimensionale, compus organic, parametru termoelectric de calitate, convertor termoelectric |
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