Electrical and optical properties of some new synthesized ylides in thin films

In this work, the synthesis of semiconducting molecular materials formed from metallo-phthalocyanines (MPcs) and bidentate amines is reported. Powder and thin-film samples of the synthesized materials, deposited by vacuum thermal evaporation, show the same intra-molecular bonds in IR-spectroscopy studies. The morphology of the deposited films was studied using scanning electron microscopy and atomic force microscopy. The optical parameters have been investigated using spectrophotometric measurements of transmittance in the wavelength range 200-1100 nm. The absorption spectra in the UV-Vis region for the deposited samples showed two bands, namely the Q and Soret bands. The optical band gap values of the thin films were calculated from the absorption coefficient α in the absorption region and were found to be around 1.4-1.6 eV. The dependence of the Tauc and Cody optical gaps on the thickness of the film was also determined.

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Section: Resultsmentioning

confidence: 99%

Morphological and Optical Properties of Dimetallo-Phthalocyanine-Complex Thin Films

Sánchez-Vergara¹,

Alvarez-Bada²,

Perez-Baeza³

et al. 2014

AMPC

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“…The optical band gap was determined from the analysis of the spectral dependence of the absorption near the fundamental absorption edges. Evaluation of the absorption coefficient α is defined by the Lambert-Beer law and can be calculated from the optical transmittance [20] [21]. The absorption coefficient α in many amorphous semiconductors shows an exponential dependence on photon energy usually obeying the empirical relation [21]- [23]:…”

Section: Figures 2(a)-(c)mentioning

confidence: 99%

Preparation of Hybrid Materials Containing M(II)Pc (M = Fe, Co, Ni)/Nylon films with Optical and Electrical Properties

Sánchez-Vergara

Huerta-Francos²,

Menéndez-Huerta³

et al. 2015

AMPC

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Hybrid materials consisting of M(II)Pc (M = Fe, Co, Ni) particles dispersed in nylon 11 films have been prepared by using a thermal relaxation technique. The obtained films are characterized by AFM, SEM and TEM, and their structural composition is determined by IR spectroscopy and EDS. The M(II)Pc particles are homogeneously distributed in the nylon 11 matrix after heat treatment. Optical absorption studies of the hybrid films are performed in the 200-1150 nm wavelength range. The band-model theory is applied to determine the optical parameters for MPc/nylon 11 hybrid films. The optical band gap of the thin films is determined from the (αhν) 1/2 vs. hν plots for indirectly allowing transitions and comparing with the as-deposited M(II)Pc thin films. The values of the optical band gap calculated from the absorption spectra, range between 1.07 and 2.7 eV. The electrical conductivity is measured in order to evaluate the conductivity behavior of these hybrid films.

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“…A plot of lgσ vs 1000/T yields a straight line whose slope can be used to determine the thermal activation energies of the complexes. 11 As can be seen from Fig. 5(a-c), during the heating, the electrical conductivity may increase with the increasing in temperature, in the range 313-373 K. The curves are generally characterized by two portions with different slopes.…”

Section: Electrical Conductivitymentioning

confidence: 89%

Research on synthesis and conductivity of ferrocenyl Schiff base and its salt

Liu

Xiong

Wang

2006

Applied Organom Chemis

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Ferrocenyl Schiff base was synthesized through the condensation of ferrocenecarboxaldehyde and p-phenylenediamine under neutral conditions, and then a new interesting category of organometallic charge transfer complex was obtained by the doping of ferrocenyl Schiff base with Fe 3+ , Al 3+ and Ti 3+ salts. The effects of the dosage of doping agent and doping temperature on the room-temperature electric conductivity of samples were discussed; in addition, the temperature dependence of the electric conductivity of samples was studied, their structures and compositions were characterized by 1 H-NMR spectra, infrared spectra, ultraviolet spectra and an electron probe X-ray microanalyser. The results showed that the electric conductivity of sample can increase 4-5 orders of magnitude after doping with a metallic salt, and the electric conductivity has a positive temperature coefficient effect. The electrical activation energies of the complexes in the range 0.09-1.54 eV were calculated from Arrhenius plots, indicating their favourable semiconducting behaviour.

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Electrical and optical properties of some new synthesized ylides in thin films

Cited by 37 publications

References 11 publications

Morphological and Optical Properties of Dimetallo-Phthalocyanine-Complex Thin Films

Morphological and Optical Properties of Dimetallo-Phthalocyanine-Complex Thin Films

Preparation of Hybrid Materials Containing M(II)Pc (M = Fe, Co, Ni)/Nylon films with Optical and Electrical Properties

Research on synthesis and conductivity of ferrocenyl Schiff base and its salt

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