Electrical and optical properties of copper and nickel molecular materials with tetrabenzo [b,f,j,n] [1,5,9,13] tetraazacyclohexadecine thin films grown by the vacuum thermal ev
Por:
Rodriguez A., Sánchez-Vergara M.E., García-Montalvo V., Ortiz-Rebollo A., Alvarez-Bada J.R., Alvarez-Toledano C.
Publicada:
1 ene 2010
Resumen:
Semiconducting molecular-material thin-films of tetrabenzo (b,f,j,n) {1,5,9,13} tetraazacyclohexadecine copper(II) and nickel(II) bisanthraflavates have been prepared by using vacuum thermal evaporation on Corning glass Substrates and crystalline silicon wafers. The films thus obtained were characterized by infrared spectroscopy (FTIR), atomic force microscopy (AFM), ultraviolet-visible (UV-vis) spectroscopy and ellipsometry. IR spectroscopy showed that the molecular-material thin-films exhibit the same intramolecular bonds as the original compounds, which Suggests that the thermal evaporation process does not significantly alter their bonds. The optical band-gap values calculated from the absorption coefficient may be related to non-direct electronic interband transitions. The effect of temperature on conductivity was also measured in these samples. It was found that the temperature-dependent electric current is always higher for the nickel-based material and Suggests a semiconductor-
Filiaciones:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Univ Nacl Autonoma Mexico, Inst Quim, Mexico City 04510, DF, Mexico
Coordinación de Ingeniería Mecatrónica, Facultad de Ingeniería, Ave. Universidad Anahuac 46, Col. Lomas Anahuac, 52786, Huixquilucan, Estado de Mexico, Mexico
Instituto Tecnológico y de Estudios Superiores de Monterrey, Calle del Puente 222, Col. Ejidos de Huipulco, 14380, Mexico, D. F., Mexico
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