Optical properties of amorphous and crystalline Sb-doped SnO2 thin films studied with spectroscopic ellipsometry: Optical gap energy and effective mass

2015 ◽  
Vol 118 (8) ◽  
pp. 085303 ◽  
Author(s):  
Hyeon Seob So ◽  
Jun-Woo Park ◽  
Dae Ho Jung ◽  
Kun Hee Ko ◽  
Hosun Lee
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Effective Mass ◽  
Spectroscopic Ellipsometry ◽  
Gap Energy ◽  
Optical Gap ◽  
Optical Gap Energy ◽  
Sno2 Thin Films

scholarly journals The calculation of the optical gap energy of ZnXO (X = Bi, Sn and Fe)

Open Physics ◽  
2016 ◽  
Vol 14 (1) ◽  
pp. 714-720 ◽  
Author(s):  
Said Benramache ◽  
Boubaker Benhaoua
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spray Deposition ◽  
Band Gap Energy ◽  
Zno Thin Films ◽  
Zno Films ◽  
Gap Energy ◽  
Optical Gap ◽  
Optical Gap Energy ◽  
Doped Zno

AbstractIn this paper, a new mathematical model has been developed to calculate the optical properties of nano materials a function of their size and structure. ZnO has good characterizatics in optical, electrical, and structural crystallisation; We will demonstrate that the direct optical gap energy of ZnO films grown by US and SP spray deposition can be calculated by investigating the correlation between solution molarity, doping levels of doped films and their Urbache energy. A simulation model has been developed to calculate the optical band gap energy of undoped and Bi, Sn and Fe doped ZnO thin films. The measurements by thus proposed models are in agreement with experimental data, with high correlation coefficients in the range 0.94-0.99. The maximum calculated enhancement of the optical gap energy of Sn doped ZnO thin films is always higher than the enhancement attainable with an Fe doped film, where the minimum error was found for Bi and Sn doped ZnO thin films to be 2,345 and 3,072%, respectively. The decrease in the relative errors from undoped to doped films can be explained by the good optical properties which can be observed in the fewer number of defects as well as less disorder.

scholarly journals A Comparative Study the Calculation of the Optical Gap Energy and Urbach Energy in Undoped and Indium Doped ZnO Thin Films

2016 ◽  
Vol 8 (1) ◽  
pp. 01008-1-01008-5
Author(s):  
Said Benramache ◽  
◽  
Boubaker Benhaoua ◽  
Okba Belahssen ◽  
◽  
...  
Keyword(s):  
Thin Films ◽  
Comparative Study ◽  
Urbach Energy ◽  
Zno Thin Films ◽  
Gap Energy ◽  
Optical Gap ◽  
Optical Gap Energy ◽  
Doped Zno

A Study on Effect of Sol Aging Time on Optical Properties of ZnO Thin Films: Spectroscopic Ellipsometry Method

2019 ◽  
Vol 11 (2) ◽  
pp. 100-108 ◽  
Author(s):  
Ehsan Motallebi Aghkonbad ◽  
Maryam Motallebi Aghgonbad ◽  
Hassan Sedghi
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Band Gap ◽  
Aging Time ◽  
Imaginary Part ◽  
Spectroscopic Ellipsometry ◽  
Annealing Temperature ◽  
Band Gap Energy ◽  
Zno Thin Films ◽  
Gap Energy

Background: Due to wide band gap and large excitonic binding energy, being inexpensive, abundance in nature and easy synthesis ZnO is a promising candidate in many applications such as solar cells. Experimental: In the current work a series of ZnO thin films were deposited on glass substrates using sol-gel method to investigate the change in optical behavior of the film with sol aging time (asprepared, 8, 16, 24 and 32 hours) and the annealing temperature (300ᵒC and 500ᵒC). The optical properties of thin films were explored using spectroscopic ellipsometry method including the real and imaginary part of refractive index, real and imaginary part of dielectric function and band gap energy of the layers in the 300-900 nanometer wavelength range. Results: It can be deduced from the results that sol aging time and annealing temperature, affect the optical properties of the samples. Using single oscillator energy model of Wemple and Di Domenico parameters such as free charge carrier concentration ratio to effective mass, and plasma frequency, were calculated. Conclusion: The films prepared using 24 h aged solution, had the highest transmittance and the largest band gap energy.

scholarly journals The calculate of optical gap energy and urbach energy of Ni1−xCoxO thin films

Sadhana ◽  
2019 ◽  
Vol 44 (1) ◽  
Author(s):  
Said Benramache ◽  
Yacine Aoun ◽  
Said Lakel ◽  
Boubaker Benhaoua ◽  
Chahrazed Torchi
Keyword(s):  
Thin Films ◽  
Urbach Energy ◽  
Gap Energy ◽  
Optical Gap ◽  
Optical Gap Energy

Effect of optical gap energy on the Urbach energy in the undoped ZnO thin films

Optik ◽  
2015 ◽  
Vol 126 (15-16) ◽  
pp. 1487-1490 ◽  
Author(s):  
Okba Belahssen ◽  
Hachemi Ben Temam ◽  
Said Lakel ◽  
Boubaker Benhaoua ◽  
Said Benramache ◽  
...  
Keyword(s):  
Thin Films ◽  
Urbach Energy ◽  
Zno Thin Films ◽  
Gap Energy ◽  
Optical Gap ◽  
Optical Gap Energy

Structural and optical properties of Tin Oxide and Indium doped SnO2 thin films deposited by thermal evaporation technique

2016 ◽  
Vol 12 (3) ◽  
pp. 4394-4399
Author(s):  
Sura Ali Noaman ◽  
Rashid Owaid Kadhim ◽  
Saleem Azara Hussain
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Tin Oxide ◽  
Thermal Evaporation ◽  
Pure Sno2 ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Evaporation Technique ◽  
Sno2 Thin Films

Tin Oxide and Indium doped Tin Oxide (SnO2:In) thin films were deposited on glass and Silicon  substrates  by  thermal evaporation technique.  X-ray diffraction pattern of  pure SnO2 and SnO2:In thin films annealed at 650oC and the results showed  that the structure have tetragonal phase with preferred orientation in (110) plane. AFM studies showed an inhibition of grain growth with increase in indium concentration. SEM studies of pure  SnO2 and  Indium doped tin oxide (SnO2:In) ) thin films showed that the films with regular distribution of particles and they have spherical shape.  Optical properties such as  Transmission , optical band-gap have been measured and calculated.

Sol-gel growth of Ni doped CdS on glass substrates: effect of spin coating speed and dopant concentration

2020 ◽  
Vol 10 ◽  
Author(s):  
Atefeh Nazari Setayesh ◽  
Hassan Sedghi
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spin Coating ◽  
Optical Band Gap ◽  
Dopant Concentration ◽  
Rotation Speed ◽  
Sol Gel ◽  
Band Gap Energy ◽  
Gap Energy ◽  
Glass Substrates

Background: In this work, CdS thin films were synthesized by sol-gel method (spin coating technique) on glass substrates to investigate the optical behavior of the film. Methods: Different substrate spin coating speeds of 2400, 3000, 3600 rpm and different Ni dopant concentrations of 0 wt.%, 2.5 wt.%, 5 wt.%) were investigated. The optical properties of thin films such as refraction index, extinction coefficient, dielectric constant and optical band gap energy of the layers were discussed using spectroscopic ellipsometry method in the wavelength range of 300 to 900 nm. Results: It can be deduced that substrate rotation speed and dopant concentration has influenced the optical properties of thin films. By decreasing rotation speed of the substrate which results in films with more thicknesses, more optical interferences were appeared in the results. Conclusion: The samples doped with Ni comparing to pure ones have had more optical band gap energy.

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