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A Small-Molecule Organic Semiconductor

Yakuphanoglu F.¹, Aydin M.², Arsu N.², Sekerci M.³

¹Firat University, Faculty of Arts and Sciences, Department of Physics, Elazig, Turkey
²Yildiz Technical University, Faculty of Arts and Sciences, Department of Chemistry, Davutpa sa-
³Firat University, Faculty of Arts and Sciences, Department of Chemistry, Elazig, Turkey

Поступила в редакцию: 7 августа 2003 г.

Выставление онлайн: 19 марта 2004 г.

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The electrical conductivity and optical properties of the bis-diethylaminokumarin have been investigated. The electrical conductivity of the compound exhibited three-dimensional hopping conduction in the temperature range 295-321 K. The compound shows typical semiconductor property and its semiconducting property results from delocalization of the pi-electrons in the structure. To determine the optical band gap of the compound, an optical absorption study was made in the wavelength range 250-600 nm. The optical study revealed that the optical transition is the allowed indirect one. The electronic parameters such as electrical conductivity at room temperature sigma₂₅, activation energy E, and optical band gap E_g, of the compound are 1.46·10^-5 S/cm, 0.42 eV and 2.46 eV, respectively. These values are in agreement with electronic parameters of organic semiconductors.

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Extended Linear Chain Compounds, ed. by J.S. Miller (N.Y., Plenum Press, 1983) v. I--III
J.P. Farges. Organic Conductors (N.Y., 1994)
D.P. Specht. P.A. Martic, S. Farid. Tetrahedron, 38, 1203 (1982)
F. Yakuphanoglu. Ph.D. Thesis. Firat University (Elazig, Turkey, 2002)
B.I. Shklovskii, A.L. Efros. Electronic Properties of Doped Semiconductors (Berlin, Springer, 1984)
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E. Abd El-Wahabb, M.M. El-Samandouy, M. Fadel. Appl. Surf. Sci., 174, 106 (2001)

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