Open AccessInfluence of Laser Energy on the Optical Properties of Ag2S ITO Thin Films Prepared by the PLD Technique
Author(s) -
Luay A. Hamid,
Majed H. Dwech,
Kadhim A. Aadim
Publication year - 2020
Publication title -
ukrainian journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.213
H-Index - 17
eISSN - 2071-0194
pISSN - 2071-0186
DOI - 10.15407/ujpe65.2.179
Subject(s) - materials science , molar absorptivity , pulsed laser deposition , absorbance , laser , refractive index , nanocrystalline material , thin film , band gap , analytical chemistry (journal) , substrate (aquarium) , indium tin oxide , optics , wavelength , attenuation coefficient , optoelectronics , nanotechnology , chemistry , physics , oceanography , chromatography , geology
Nanocrystalline silver sulfide (Ag2S) thin films were prepared by the pulse laser deposition technique (PLD) on the indium-tin oxide (ITO) substrate at room temperature. In the PLD technique, an Nd : YAG laser with a wavelength of 1064 nm at different laser energies from 400 to 900 mJ is used with an increment of 100 mJ in each step with 200 pulses for each sample. The optical properties such as the refraction index n, absorption coefficient a, and extinction coefficient k are examined using the transmission and absorbance measurements on a UV-Vis-NIR spectrophotometer in the wavelength range (200–1100) nm. The average extinction coefficient is found between 0.076–0.163, while the average refractive index is between 2.214–2.528. The energy band gap decreases from 2.39 to 1.9 eV with increasing the laser energy.