Band gap and optical constants of microcrystalline CdTe thin films

1989 ◽  
Vol 7 (3) ◽  
pp. 1428-1431 ◽  
Author(s):  
M. Meléndez‐Lira ◽  
S. Jiménez‐Sandoval ◽  
I. Hernández‐Calderón
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Optical Constants ◽  
Cdte Thin Films

scholarly journals Optical spectroscopic analysis of annealed Cd1−xZnxSe thin films deposited by close space sublimation technique

2016 ◽  
Vol 34 (4) ◽  
pp. 828-833 ◽  
Author(s):  
Ijaz Ali ◽  
Amjid Iqbal ◽  
Arshad Mahmood ◽  
A. Shah ◽  
M. Zakria ◽  
...  
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Optical Constants ◽  
Empirical Relation ◽  
Optical Transmittance ◽  
Oscillator Model ◽  
Optical Investigation ◽  
Dispersion Parameters ◽  
Zn Content ◽  
Space Sublimation

AbstractCd1−xZnxSe (x = 0, 0.40 and 1) thin films were deposited on a glass substrate at room temperature by closed space sublimation method. Optical investigation has been performed using spectrophotometry and ellipsometry. It has been found that for as deposited films the optical band gap increased and the optical constants decreased with increasing Zn content. To improve the optical properties of Cd1−xZnxSe thin films annealing effect at 400 °C was taken into consideration for various Zn contents. It was observed that the optical transmittance and band gap decreased while optical constants increased with increasing Zn content after annealing. The effects of composition and annealing on the optical dispersion parameters Eo and Ed were investigated using a single effective oscillator model. The calculated value of the average excitation energy Eo obeys the empirical relation (Eo = Eg/2) obtained from the single oscillator model.

Optical band gap and dispersion of optical constants of Cu-Ga-S thin films

Optik ◽  
2019 ◽  
Vol 186 ◽  
pp. 147-154 ◽  
Author(s):  
M. Isik ◽  
H.H. Gullu ◽  
E. Coskun ◽  
N.M. Gasanly
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Optical Constants ◽  
Optical Band Gap

STRUCTURAL PARAMETERS AND OPTICAL CONSTANTS OF CdS NANOCRYSTALLINE THIN FILMS

NANO ◽  
2011 ◽  
Vol 06 (03) ◽  
pp. 251-258 ◽  
Author(s):  
B. VISWANATHAN ◽  
J. DHARMARAJA ◽  
J. BALAMURUGAN
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Band Gap ◽  
Crystallite Size ◽  
Optical Conductivity ◽  
Optical Constants ◽  
Optical Band Gap ◽  
Structural Parameters ◽  
Stoichiometric Composition ◽  
Bath Temperature

Optical constants of cadmium sulfide (CdS) thin films were determined in the spectral range of 400–1200 nm from optical absorption and transmittance measurements for different bath temperatures. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) were the techniques used to determine the crystallite structure and morphology of the films. EDX images showed that a sample had a stoichiometric composition. The crystallite size and microstrain were calculated using the Williamson–Hall method. The optical band gap values of the films varied from 2.35 eV to 2.5 eV, depending on the bath temperature. Optical study was performed to calculate the refractive index (n), extinction coefficient (k), optical conductivity (σ), dielectric constant (real and imaginary), and optical band gap using transmission spectra. It has been observed that the conductivity of the synthesized films has a close relationship with the size of the crystallites. The optical conductivity and the crystallite size increase at a temperature of up to 70°C and then start decreasing when the temperature is still increased due to the change in phase from hexagonal to cubic in nature. Moreover, we observed that beyond this temperature the XRD peak shifts toward the nanoregion. The values of microstructure parameters change drastically, whereas the trend of optical constants remains the same.

Substrate Temperature Effect on Optical Constants of Gd2O3 Thin Films

2010 ◽  
Vol 442 ◽  
pp. 96-101 ◽  
Author(s):  
M.F. Wasiq ◽  
M.Y. Nadeem ◽  
Franck Chollet ◽  
S. Atiq
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Substrate Temperature ◽  
Band Gap ◽  
Extinction Coefficient ◽  
Optical Constants ◽  
Urbach Energy ◽  
Band Gap Energy ◽  
Oxide Material ◽  
Atomic Force

Effect of substrate temperature on lanthanide oxide material Gd2O3 thin films deposited by e-beam evaporation has been reported in the present work. Optical properties and surface morphology of as deposited films have been measured using spectrophotometry and atomic force microscopy respectively. Optical constants such as refractive index, extinction coefficient, band gap and Urbach energy have been determined by analysis of experimentally recorded absorption, transmittance and reflection data in wavelength range 200-800nm. Optical band gap energy shows decreasing while Urbach energy shows increasing behavior with increasing temperature. Extinction coefficient and refractive index with varying wavelengths are also calculated. Surface topographies of all samples are studied by atomic force microscope (AFM) and root mean square (RMS) value of roughness is observed increasing with increasing substrate temperature.

Optical band gap and optical constants in a-GaxTe100−x thin films

1998 ◽  
Vol 11 (1) ◽  
pp. 67-77 ◽  
Author(s):  
M. Ilyas ◽  
M. Zulfequar ◽  
Zishan H. Khan ◽  
M. Husain
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Optical Constants ◽  
Optical Band Gap
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