Optical and Electrical Properties of TTF-MPcs (M = Cu, Zn) Interfaces for Optoelectronic Applications

Sandwich structures were fabricated by a vacuum deposition method using MPc (M = Cu, Zn), with a Tetrathiafulvalene (TTF) derivative, and Indium Tin Oxide (ITO) and aluminum electrodes. The structure and morphology of the deposited films were studied by IR spectroscopy, scanning electron microscopy...

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Published inMolecules (Basel, Switzerland) Vol. 20; no. 12; pp. 21037 - 21049
Main Authors Sánchez-Vergara, María Elena, Leyva-Esqueda, Mariel, Alvárez-Bada, José Ramón, García-Montalvo, Verónica, Rojas-Montoya, Iván Darío, Jiménez-Sandoval, Omar
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 25.11.2015
MDPI
Subjects
Absorption spectra
Aluminum
Conduction
Copper - chemistry
Electrical properties
Electrical resistivity
Electricity
Energy gap
Heterocyclic Compounds - chemistry
Indium
Infrared spectroscopy
Interfaces
Optical Devices
optical properties
Optoelectronics
organic semiconductor
Photonic band gaps
phthalocyanines
Sandwich structures
Scanning electron microscopy
Spectroscopy
Spectrum analysis
Thin films
Vacuum
Vacuum deposition
Volt-ampere characteristics
Zinc
Zinc - chemistry
phthalocyanines
optical properties
electrical properties
organic semiconductor
thin films
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Summary:Sandwich structures were fabricated by a vacuum deposition method using MPc (M = Cu, Zn), with a Tetrathiafulvalene (TTF) derivative, and Indium Tin Oxide (ITO) and aluminum electrodes. The structure and morphology of the deposited films were studied by IR spectroscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The absorption spectra of TTF derivative-MPc (M = Cu, Zn) thin films deposited at room temperature were recorded in the spectral range 200-1000 nm. The optical band gap of the thin films was determined from the (αhν)(1/2) vs. hν plot. The direct-current (DC) electrical properties of the glass/ITO/TTFderiv-MPc (M = Cu, Zn)/Al structures were also investigated. Changes in conductivity of the derivative-TTF-enriched Pc compounds suggest the formation of alternative paths for carrier conduction. At low voltages, forward current density obeys an ohmic I-V relationship; at higher voltages, conduction is mostly due to a space-charge-limited conduction (SCLC) mechanism.
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These authors contributed equally to this work.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules201219742