Doping effects on the optical properties of evaporated a-Si:H films

Bakry, Assem; El-Naggar, Ahmed H.

doi:10.1016/s0040-6090(99)00888-3

Cited by 28 publications

(14 citation statements)

References 23 publications

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“…The absolute values of the measured transmittance T and reflectance R at different wavelength, after correction of the absorbance and reflectance of the substrate, are given by [17,18]:…”

Section: Methods Of Calculationmentioning

confidence: 99%

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

El-Nahass

Atta

El-Sayed

et al. 2008

Applied Surface Science

101

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“…The absolute values of the measured transmittance T and reflectance R at different wavelength, after correction of the absorbance and reflectance of the substrate, are given by [17,18]:…”

Section: Methods Of Calculationmentioning

confidence: 99%

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

El-Nahass

Atta

El-Sayed

et al. 2008

Applied Surface Science

101

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“…After correction of the absorbance and reflectance of the substrate are given by [8,9] T~( ! :Jt-R,)…”

Section: ! Experimental Detailsmentioning

confidence: 99%

“…a computer program comprising a modified search technique, [8] based on minimizing (ARY and (AT)2, simultaneously, where where, T eltP and Rexp are the experimentally detennined values ofT and R respectively, and R(n.k) and 'f<n.k) are the calculated values of T and R, using the Munnann's exact equations [8,9]. (R+n<1 at shorter wavelengths (A < 900 nm) due to existance of absorption (absorbing region).…”

Section: ! Experimental Detailsmentioning

confidence: 99%

“…(R+n<1 at shorter wavelengths (A < 900 nm) due to existance of absorption (absorbing region). After the determination of the film thickness, the bivraiance search technique have been used [8,9] to determine the real and imaginary parts of the complex refractive index from the absolute values of transmittance and reflectance of films, using Murmann's exact formulas as mentioned above Taking into account, the experimental error in measuring the film thickness to be ±2% and in T and R to be ±I %, the error in the calculated values of n and k was estimated to be ±3% and ±2.5%, respectively. The optical constants were found to be independent of the film thickness for the studied films.…”

Section: ! Experimental Detailsmentioning

confidence: 99%

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Optical Properties of Evaporated Iron Phthalocyanine(FePc) Thin Films

Nhass

Soliman

Metwally

et al. 2001

J Opt

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The optical properties of thin FePc films have been investigated using spectrophotometric measurements of transmittance and reflectance in the wavelength range 200-210 nm. The refractive index n as well as the absorption index. k were calculated before and after annealing. It is abvious that the refractive index showed an anomalous dispersion in the absorption region as well as normal dispersion in the transparent region. The analysis of the spectral behaviour of the absorption coefficient, a in the absorption region revlealed direct transition. The analysis of a as well as the dielectric constants (E} and E 2 ), reveals several absorption peaks at photon energies given in the following table for films before and after annealing. Table: Absorption peak..~ existing in FePc thin films before and after annealing. Visible (Q) Sorel (B) Variable (N) (M) FePc(asdeposiled) 1.77 ± 0.11.95±0.05 2.40±O.23.6±O.2 4.45±O.5 5.90±0.4 FePc(as annealing) 1.76 ± 0.1 1.97±O.1 2.42±OJ 3.7±O.3 4.35±O.2 5.77±0.4These transitions are interpreted in the text. The fundamental and the onsel energy gaps can also be estimated as 2.63±O,02 and 1.38±O.02 eV respectively.

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“…The absolute values of T and R at different wavelengths (making base line correction with the substrates) are given by the following equation [20,21]:…”

Section: Film Deposition and Measurementsmentioning

confidence: 99%