Electrical and optical properties of copper-complexes thin films grown by the vacuum thermal evaporation technique
Por:
Sánchez-Vergara M.E., Rivera M., Alonso-Huitrón J.C., Rodriguez A., Álvarez-Bada J.R.
Publicada:
15 feb 2013
Resumen:
In this work, the synthesis and characterization of molecular materials formed from K2[Cu(C2O4)2], 1,8-dihydroxyanthraquinone and its potassium salt are reported. These complexes have been used to prepare thin films by vacuum thermal evaporation. The synthesized materials were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), fast atomic bombardment (FAB+) mass and ultraviolet-visible (UV-vis) spectroscopy. Electrical transport properties were studied by dc conductivity measurements. The electrical activation energies of the complexes, which were in the range of 0.36-0.65 eV, were calculated from their Arrhenius plots. Optical absorption studies in the 100-1100 nm wavelength range at room temperature showed thin films' optical band gaps in the 2.3-3.9 eV range for direct transitions. On the other hand, strong visible photoluminescence (PL) at room temperature was noticed from the thermally-evaporated thin solid films. The PL of all investigated samples were observed with the naked eye in a bright background. The PL and absorption spectra of the investigated compounds are strongly influenced by the molecular structure and nature of the organic ligand. © 2012 Elsevier B.V. All rights reserved.
Filiaciones:
Univ Nacl Autonoma Mexico, Inst Fis, Dpto Mat Condensada, Mexico City 04510, DF, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Facultad de Ingeniería, Universidad Anáhuac México Norte, Avenida Universidad Anáhuac 46, Col. Lomas Anahuac, 52786 Huixquilucan, Estado de Mexico, Mexico
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