Abstract
In this work, we propose a method to synthesize vanadium (IV) 2-benzyli-dene-1-indanone derivatives, used to prepare film structures by thermal evaporation. The complexes possess high melting point allowing the using of vacuum deposition methods. All the samples were grown at room temperature (25℃) and low deposition rates (0.4 Å/s). The surface morphology and structure of the deposited films were studied by scanning electron microscopy (SEM) and spectroscopy dispersive energy (EDS). Optical absorption studies of the complex films were performed in the 200 - 1100 nm wavelength range. The Tauc band gap (Eg) of the thin films was determined from the (αhν)1/2 vs. hν plots for indirect transitions. The vanadium (IV) complex films show optical activation energies in the range of organic semiconductors. Multilayer nylon 11/vanadium indanone devices were fabricated using ITO and silver electrodes. The d.c. electrical properties of the device were also investigated. It was found that the temperature-dependent electric current in the structure showed a semiconductor behavior. At lower voltages below 7 V, the current density in the forward direction was found to obey an ohmic I-V relationship; for higher voltages above 7 V, the conduction was dominated by a space-charge-limited (SCLC) mechanism. The electrical activation energies (Ea) of the complexes were in the 2.17 - 2.31 eV range.
Highlights
The use of organic semiconductors in the manufacture of electronic gadgets suchM
Due to their physical properties, vanadium indanone thin films were deposited by thermal vacuum evaporation
Thin film morphology seems to depend on the molecular structure of the ligand around de vanadium atom; polarity in the radical of ligand is a decisive factor for the morphology and thickness of the formed film
Summary
The use of organic semiconductors in the manufacture of electronic gadgets suchM. Lozano-González et al.as light-emitting diodes, rechargeable batteries, sensors, and electronic devices, has shown a rapid increase in recent years. The main difference between organic semiconductors compared with single atom inorganic semiconductors is the presence of separate molecules, which maintain most of their characteristics even in the solid-state form [1]. These single molecule characteristics are reflected in the optical and electrical properties like absorption, gap and the transport of charge carriers [2]. Molecules including transition metals more commonly provide better results as organic semiconductors. Coordination compounds with active redox metals that exhibit paramagnetic properties often undergo electronic excitations with visible light, which increases the possibilities to be used as organic semiconductor materials
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