2012
DOI: 10.12693/aphyspola.121.628
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Validity of Swanepoel's Method for Calculating the Optical Constants of Thick Films

Abstract: Optical constants, dispersion and oscillator parameters of dierent thicknesses of amorphous Ge25Cd5Se70 lms have been deposited onto glass substrates using thermal evaporation technique. The optical constants have been investigated by optical spectrophotometry measurements. The straight forward analysis proposed by Swanepoel, which is based on the use of the extremes of the interference fringes has been used in order to derive the refractive index and the lm thickness in µm range. The refractive index could be… Show more

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Cited by 88 publications
(32 citation statements)
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References 31 publications
(17 reference statements)
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“…Other researchers have also found selenium rich binary and ternary glasses to obey the indirect rule transition [16] [17]. Indirect optical band gap energy from the studied thin films was observed to decrease with increase in substrate temperature and bismuth content as shown in Figure 6.…”
Section: Resultssupporting
confidence: 54%
“…Other researchers have also found selenium rich binary and ternary glasses to obey the indirect rule transition [16] [17]. Indirect optical band gap energy from the studied thin films was observed to decrease with increase in substrate temperature and bismuth content as shown in Figure 6.…”
Section: Resultssupporting
confidence: 54%
“…The reduction in energy band gap may also be due to the extension of localized states in amorphous structure. 15 As observed from the XRD pattern, the unsaturated bond in the amorphous structure due to the insufficient number of atoms causes defects that are responsible for the formation of localized states. The tailing of localized states in the band gap can be studied using the empirical Urbach rule as given below…”
Section: Optical Transmittance and Energy Band Gapmentioning
confidence: 99%
“…This is because, during the film deposition at room temperature, the low thermal activation energy leads to the formation of some unsaturated bonds along with the saturated bonds due to the insufficient number of atoms and hence the atoms may not be able to sit in its lattice position, which leads to distortion. 15 Therefore, the films are in amorphous nature.…”
Section: A Structural Propertiesmentioning
confidence: 99%
“…Lowest dielectric constants were found for the film deposited at a substrate temperature of 250 °C. This can be attributed to high crystallinity of the film [16] as indicated in The optical conductivity (σo) is useful for studying the electronic states in materials and can be calculated using the formula [34,35,36];…”
Section: Optical Analysismentioning
confidence: 99%