Structural and optical studies of thermally evaporated CoPc thin films

El-Nahass, M.M.; El-Gohary, Z.; Soliman, H. S.

doi:10.1016/s0030-3992(03)00068-9

Cited by 200 publications

(110 citation statements)

References 18 publications

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“…However because of that, it is impossible to assert unequivocally that the resulting layer of CoPcF 4 has the same crystalline phase as polycrystalline CoPcF 4 . It is known [22,23] that CoPc can be deposited on the substrate in two possible crystal phases -metastable α-phase (Fig. 2a) and stable β-phase (Fig.…”

Section: Resultsmentioning

confidence: 99%

Thin Layers XRD Study Technique on an Example of Cobalt Tetrafluoro Phthalocyanine

2016

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Thin layers X-ray diffraction study technique utilizing single-crystal X-ray diffractometer equipped with microfocus X-ray tube is described. It is shown that the layers of the tetra-fluorinated cobalt phthalocyanine (CoPcF4), deposited by thermal evaporation in vacuum on a polished surface of the substrate (glass, quartz), have a highly oriented polycrystalline structure. All the crystallites have the (00l) plane oriented along the surface of the substrate. CoPcF4 X-ray diffraction pattern indexing was conducted and unit cell parameters were determined. It is shown that crystal phase of both polycrystalline powder and thin layers of CoPcF4 are isostructural to that of α-CoPc.

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Section: Resultsmentioning

confidence: 99%

Thin Layers XRD Study Technique on an Example of Cobalt Tetrafluoro Phthalocyanine

2016

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“…To get information about direct or indirect inter-band transitions, the optical band gap was determined from the analysis of the spectral dependence of the absorption near the fundamental absorption edges within the framework of one electron theory [41]. The energy dependences of the interband absorption coefficient are given by the following expression, for allowed direct transitions [42],…”

Section: Resultsmentioning

confidence: 99%

“…The volume and surface loss functions (VELF and SELF) are proportional to the characteristics energy loss of fast electrons traveling the bulk and surface of the material, respectively. They related to the real and imaginary parts of the dielectric constant and can be calculated by using the relations [41] Figure 12 shows the behavior of the VELF and FELF with photon energy revealing that both of them seem to be independent on photon energy in the range 2.5 eV -3.6 eV. Also, it is clear that the maximum of SELF and VELF correspond to the absorption energy due to the interband transition that occurs at 4.13 eV and 4.53 eV.…”

Section: Resultsmentioning

confidence: 99%

Optical Properties of RF Sputtered Samarium Oxide Thin Films

El-Raheem¹,

Bogami²,

Al-Baradi³

et al. 2015

OALib

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This paper reports the optical properties of prepared samarium oxide Sm2O3 thin films nanoparticles using RF sputtering technique. X-ray diffraction is used to examine and characterize the prepared films. Optical measurements are carried out by employing U-V-Visible spectroscopy to study optoelectronic properties of Sm2O3 thin films. These films are highly transparent in the visible range. The average value of the optical gap belonging to the thin films deposited under different pressure of the gas is 4.33 eV. The refractive index (n) behaves as normal dispersion and decreases with increasing the pressure of the gas. The dispersion energy and single oscillator energy increase with increasing the pressure of the gas whereas the optical conductivity decreases with increasing the power on Sb target.

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“…[85] The lower energy peaks have been explained as other peaks of π-π* transition or as excitation peaks or as vibrational intervals. [85] The B-band or intense Soret consists in the near ultraviolet and is often accompanied by a closely related variable (N)-band of lower intensity. [84] In the near ultraviolet region (from 3.26 to 6.2 eV), there are two peaks (at 3.32 and 3.86 eV).…”

Section: Resultsmentioning

confidence: 99%

Investigation of the spectral, optical and surface morphology properties of theN,N′-Dipentyl-3,4,9,10-perylenedicarboximide small molecule for optoelectronic applications

Gündüz

2015

Polym. Adv. Technol.

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Investigation of the spectral, optical and surface morphology properties of the N,N′-Dipentyl-3,4,9,10-perylenedicarboximide small molecule for optoelectronic applications † Bayram Gündüz* The spectral and optical properties of the solutions of the N,N′-Dipentyl-3,4,9,10-perylenedicarboximide (PTCDI-C5) small molecule for different molarities were investigated in detail. The significant spectral parameters such as molar/mass extinction coefficients, absorption coefficient, electric dipole line strength, and oscillator strength of the PTCDI-C5 molecule were calculated. The absorption bands of PTCDI-C5 show vibronic structures with seven peaks at 2.08, 2.35, 2.53, 2.70, 2.86, 3.32, and 3.86 eV, respectively. The electronic spectra of the PTCDI-C5 can be characterized by two basic regions as visible and Soret band. Effects of the molarities on the significant many optical parameters were investigated in detail. The direct and indirect allowed optical band gaps of the PTCDI-C5 decrease with increasing molarity. Then, surface morphology properties were investigated and calculated roughness parameters of the PTCDI-C5 film. Finally, we discussed for optoelectronic applications of these parameters, and this study was compared with the similar and related studies in the literature.

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Structural and optical studies of thermally evaporated CoPc thin films

Cited by 200 publications

References 18 publications

Thin Layers XRD Study Technique on an Example of Cobalt Tetrafluoro Phthalocyanine

Thin Layers XRD Study Technique on an Example of Cobalt Tetrafluoro Phthalocyanine

Optical Properties of RF Sputtered Samarium Oxide Thin Films

Investigation of the spectral, optical and surface morphology properties of theN,N′-Dipentyl-3,4,9,10-perylenedicarboximide small molecule for optoelectronic applications

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