Effect of Organic Dopants in Dimetallophthalocyanine Thin Films: Application to Optoelectronic Devices - Advances in Materials Physics and Chemistry

AMPC > Vol.9 No.4, April 2019

Effect of Organic Dopants in Dimetallophthalocyanine Thin Films: Application to Optoelectronic Devices ()

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Download as PDF (Size: 2025KB) PP. 71-88

DOI: 10.4236/ampc.2019.94007 646 Downloads 1,397 Views Citations

Author(s)

María Elena Sánchez-Vergara, Santiago Osorio-Lefler, Pablo Osorio-Lefler, José Ramón Álvarez-Bada

Affiliation(s)

Universidad Anáhuac México, Avenida Universidad Anáhuac 46, Col. Lomas Anáhuac, Huixquilucan, Estado de México, México.

ABSTRACT

Semiconductor films of organic, doped dimetallophthalocyanine M₂Pcs (M = Li, Na) on different substrates were prepared by synthesis and vacuum evaporation. Tetrathiafulvalene (TTF) and tetracyanoquinodimethane (TCNQ) were used as dopants and the structure and morphology of the semiconductor films were studied using IR spectroscopy, X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS). The absorption spectra recorded in the ultraviolet-visible region for the deposited films showed the Q and Soret bands related to the electronic π-π* transitions in M₂Pc molecules. Optical characterization of the films indicates electronic transitions characteristic of amorphous thin films with optical bandgaps between 1.2 and 2.4 eV. Finally, glass/ITO/doped M₂Pc/Ag thin-film devices were produced and their electrical behavior was evaluated by using the four-tip collinear method. The devices manufactured from Na₂Pc have a small rectifying effect, regardless of the organic dopant used, while the device manufactured from Li₂Pc-TCNQ presents ohmic-like behavior at low voltages, with an insulating threshold around 19 V. Parameters such as the hole mobility (μ), the concentration of thermally-generated holes (p₀), the concentration of traps per unit of energy (P₀) and the total trap concentration (N_t_(e)) were also determined for the Li₂Pc-TTF device.

KEYWORDS

Organic Semiconductors, Thin Films, Optical Properties, Electrical Properties, Optoelectronic Devices

Share and Cite:

Sánchez-Vergara, M. , Osorio-Lefler, S. , Osorio-Lefler, P. and Álvarez-Bada, J. (2019) Effect of Organic Dopants in Dimetallophthalocyanine Thin Films: Application to Optoelectronic Devices. Advances in Materials Physics and Chemistry, 9, 71-88. doi: 10.4236/ampc.2019.94007.

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