Structural and optical properties of thermal evaporated magnesium phthalocyanine (MgPc) thin films

El-Nahass, M.M.; Atta, A.A.; El-Sayed, H.E.A.; El-Zaidia, E.F.M.

doi:10.1016/j.apsusc.2007.09.064

Cited by 101 publications

(16 citation statements)

References 39 publications

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“…In the case of the diffractograms of heterostructures based on ZnPc, some lines characteristic to this material are observed (6.8, 9.1 and 13.8°) [54,63], meaning that ZnPc presents some degree of crystallinity. The amorphous Heterostructures Based on Porphyrin/Phthalocyanine Thin Films for Organic Device Applications http://dx.doi.org/10.5772/67702 behaviour of the phthalocyanines was also reported for films prepared by VTE [82]. So, this behaviour is independent of a deposition technique.…”

Section: Heterostructures Based On Metal Phthalocyanines (Znpc or Mgpmentioning

confidence: 68%

Heterostructures Based on Porphyrin/Phthalocyanine Thin Films for Organic Device Applications

Socol¹,

Preda²,

Stănculescu³

et al. 2017

Phthalocyanines and Some Current Applications

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Multilayer or blend heterostructures based on porphyrins and phthalocyanines were obtained on different substrates using VTE and MAPLE methods. Stacked structures based on ZnPc and C60 with NTCDA were prepared by VTE on ITO/glass, their current value being increased by the deposition of the materials in an inverted configuration or by using ITO/PEDOT:PSS as a substrate. Multilayer structures comprising ZnPc and NTCDA were fabricated by MAPLE on an AZO/glass. Treating the AZO in oxygen plasma, a higher current value was obtained for the deposited heterostructures. The oxygen plasma treatment can increase the work function of the AZO resulting in a decrease of the energetic barrier from AZO/organic interface and finally improving the charge transport. Stacked layers or blend heterostructures having ZnPc, MgPc and TPyP were deposited by MAPLE on ITO/PET. In the case of those containing MgPc and TPyP, an increase in the current value (in dark) was obtained for the blend compared to the stacked layer configuration. For those with ZnPc and TPyP, under illumination, a photovoltaic effect was observed for the blend structure. All heterostructures are featured by a large absorption in the visible domain of the solar spectrum and suitable electrical properties for their use in OPV applications.

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Section: Heterostructures Based On Metal Phthalocyanines (Znpc or Mgpmentioning

confidence: 68%

Heterostructures Based on Porphyrin/Phthalocyanine Thin Films for Organic Device Applications

Socol¹,

Preda²,

Stănculescu³

et al. 2017

Phthalocyanines and Some Current Applications

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show abstract

“…The transmittance and reflectance values were used to calculate the absorption coefficient α according to the following equation [5][6][7]:…”

Section: Resultsmentioning

confidence: 99%

Estimation of optical parameters of silicon single crystals with different orientations

El-Nahass

Ali

2019

Materials Science-Poland

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Optical properties of Si single crystals with different orientations (1 0 0) and (1 1 1) were investigated using spectrophotometric measurements in a spectral range of 200 nm to 2500 nm. The data of optical absorption revealed an indirect allowed transition with energy gap of 1.1 ± 0.025 eV. An anomalous dispersion in refractive index. The normal dispersion of the refractive index was discussed according to Wemple-DiDomenico single oscillator model. The oscillator energy Eo, dispersion energy Ed, high frequency dielectric constant ∈∞, lattice dielectric constant ∈L and electronic polarizability αe were estimated. The real ∈1 and imaginary ∈2 parts of dielectric constant were also determined.

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“…The dashed lines present the decomposition of the molar extinction spectrum on particular oscillatory transitions. It is useful to relate the absorption coefficient (α) to the molar extinction (ε molar ), which is often used to describe the absorption of light by nonsolid molecular media, and in the solid, the absorption coefficient can be written in the form [42,43] Figure 10 shows the plot of ε molar as a function of the wave number for as-deposited PTCDI thin films. Intensities of all the absorption bands are evaluated by measuring their oscillator strength, f , which is found to be proportional to the area under the absorption peak shapes.…”

Section: Optical Energy Gapmentioning

confidence: 99%

“…Intensities of all the absorption bands are evaluated by measuring their oscillator strength, f , which is found to be proportional to the area under the absorption peak shapes. The oscillator strength and the electric dipole strength, q 2 , can be calculated by the following mathematical expressions [43]:…”

Section: Optical Energy Gapmentioning

confidence: 99%

Structural and Optical Properties of Nanocrystalline 3,4,9,10-Perylene-Tetracarboxylic-Diimide Thin Film

El-Nahhas

Abdel-Khalek

Salem

2012

Advances in Condensed Matter Physics

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Thin films of nanocrystalline 3,4,9,10-perylene-tetracarboxylic-diimide (PTCDI) were prepared on quartz substrates by thermal evaporation technique. The structural properties were identified by transmission electron microscopy (TEM) and the X-ray diffraction (XRD). The optical properties for the films were investigated using spectrophotometric measurements of the transmittance and reflectance at normal incidence of light in the wavelength range from 200 to 2500 nm. The optical constants (refractive indexnand absorption indexk) were calculated and found to be independent on the film thickness in the measured film thickness range 117–163 nm. The dispersion energy (Ed), the oscillator energy (Eo), and the high-frequency dielectric constantε∞were obtained. The energy band model was applied, and the types of the optical transitions responsible for optical absorption were found to be indirect allowed transition. The onset and optical energy gaps were calculated, and the obtained results were also discussed.

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Structural and optical properties of thermal evaporated magnesium phthalocyanine (MgPc) thin films

Cited by 101 publications

References 39 publications

Heterostructures Based on Porphyrin/Phthalocyanine Thin Films for Organic Device Applications

Heterostructures Based on Porphyrin/Phthalocyanine Thin Films for Organic Device Applications

Estimation of optical parameters of silicon single crystals with different orientations

Structural and Optical Properties of Nanocrystalline 3,4,9,10-Perylene-Tetracarboxylic-Diimide Thin Film

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