Study optical properties for pbS thin films before and after irradiation by CO2 laser | ||
| Tikrit Journal of Pure Science | ||
| Article 1, Volume 19, Issue 5, August 2014, Pages 107-112 | ||
| Author | ||
| Najat A.Dahham | ||
| Abstract | ||
| Abstract In this study, Lead sulphide (PbS) thin films were deposited on glass substrates using the thermal vacuum evaporation technique at lressure 105 torr. The prepared films were arulealed to 200'C by using oven under vacuum with pressure I 0 ' torr then the samples inadiated by CO2 laser of power ( I wan) and wavelength ( 10.6) pm at distance (10 cm) from the source for (5 sec). The optical characteristics ofthe prepared thin films have been investigated using IR spectrophotometer. Optical constants such as absorption, reflection, absorption coefficient (o), Band gap energy (EJ, extinction coefficient (K), rellactive index (n), and complex dielectric constants (t.&s,) were evaluated from Eansmission specha. The results show that the laser irradiation cause decreasing in tansmittance, reflection, band gap energy, refractive index and in the real part of dielectric constant while increasing in the absorption, extinction co€fficient and imaginary pan ofdielectric constant, in the investigated region | ||
| Keywords | ||
| PbS; thin film; optical Foperties; energy band gap and laser irradiation | ||
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