Molecular materials derived from MPc (M=Fe, Pb, Co) and 1,8-dihydroxiantraquinone thin films: Formation, electrical and optical properties |
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Authors: | M.E. Sá nchez Vergara,A. Ortiz Rebollo,M. Rivera |
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Affiliation: | a Coordinación de Ingeniería Mecatrónica, Facultad de Ingeniería, Universidad Anahuac del Norte, Avenida Lomas de la Anahuac s/n, Col. Lomas Anahuac, 52786 Huixquilucan, Estado de México, Mexico b Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, A. P. 70-360, Coyoacán, 04510 México D.F., Mexico c Instituto Tecnológico y de Estudios Superiores de Monterrey, Campus Ciudad de México, Calle del Puente 222, Col. Ejidos de Huipulco, 14380 México D.F., Mexico d Instituto de Física, Universidad Nacional Autónoma de México, Dpto. Materia Condensada, Coyoacán, 04510 México D.F., Mexico |
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Abstract: | Semiconductor-like thin films were grown using metallic phthalocyanines (MPc) (M=Fe, Pb, Co) and 1,8 dihydroxiantraquinone as initial compounds. The morphology of the deposited films was studied by using scanning electron microscopy and atomic force microscopy. The powder and thin-film samples of the synthesized materials, deposited by vacuum thermal evaporation, showed the same intra-molecular bonds as in IR spectroscopy studies, which suggests that the evaporation process does not alter these bonds. The optical band gap values of C60H28N8O8Fe, C60H28N8O8Pb and C60H28N8O8Co calculated from the absorption coefficient were found to be 1.60, 1.89 and 1.75 eV, respectively, arising from non-direct transitions. The effect of temperature on conductivity was also measured in these samples. It was found that the temperature-dependent electric current in all cases showed a semiconductor behavior with conductivities in the order of 10−6 Ω−1 cm−1 where the highest value corresponded to the cobalt material. The linear dependence observed in the films implies only one type of conduction mechanism in all cases, with mean activation energies of the order of 1.55, 1.77 and 1.50 eV for iron, lead and cobalt-based thin films, respectively. |
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Keywords: | A. Thin films B. Chemical synthesis D. Electrical properties D. Optical properties D. Semiconductivity |
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