Influence of Laser Energy on the Optical Properties of Ag2S ITO Thin Films Prepared by the PLD Technique

  • L. A. Hamid Department of Physics, College of Science, University of Karbala
  • M. H. Dwech Department of Physics, College of Science, University of Karbala
  • K. A. Aadim Department of Physics, College of Science, University of Baghdad
Keywords: Ag2S thin films, PLD technique, UV-Vis-NIR spectrophotometer, optical properties

Abstract

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.

References

N.N. Greenwood, A. Earnshaw. Chemistry of the Elements (Elsevier, 1997).

R.P. Bagwe, K.C. Khilar. Effects of intermicellar exchange rate on the formation of silver nanoparticles in reverse microemulsions of AOT. Langmuir 16, 905 (2000). https://doi.org/10.1021/la980248q

D. Qin, L. Zhang, G. He, Q. Zhang. Synthesis of Ag2S nanorods by biomimetic method in the lysozyme matrix. Mater. Res. Bulletin 48 (9), 3644 (2013). https://doi.org/10.1016/j.materresbull.2013.05.039

U. Jadhav, S. Patel, R. Patil. Synthesis of silver sulphide nanoparticles by modified chemical route for solar cell applications. Res. J. Chem. Sci. 3 (7), 69 (2013).

H. Zeng, X.W. Du, S.C. Singh, S.A. Kulinich, S. Yang, J. He, W. Cai. Nanomaterials via laser ablation/irradiation in liquid: A review. Adv. Funct. Mater. 22 (7), 1333 (2012). https://doi.org/10.1002/adfm.201102295

B. Maniscalco, P.M. Kaminski, J. Walls. Thin film thickness measurements using scanning white light interferometry. Thin Solid Films 550, 10 (2014). https://doi.org/10.1016/j.tsf.2013.10.005

C. Yim, M. O'Brien, N. McEvoy, S. Winters, I. Mirza, J.G. Lunney, G.S. Duesberg. Investigation of the optical properties of MoS2 thin films using spectroscopic ellipsometry. Appl. Phys. Lett. 104 (10), 103114 (2014). https://doi.org/10.1063/1.4868108

P. Agbo, P. Nwofe. Structural and optical properties of sulphurised Ag2S thin films Int. J. Thin Films Sci. Tech. 4 (1), 9 (2015).

O.G. Abdullah, D.A. Tahir, K. Kadir. Optical and structural investigation of synthesized PVA/PbS nanocomposites. J. Mater. Sci.: Mater. in Electron. 26 (9), 6939 (2015). https://doi.org/10.1007/s10854-015-3312-9

S. Thirumavalavan, K. Mani, S. Suresh. Investigation on structural, optical, morphological and electrical properties of lead sulphide (PbS) thin films. J. Ovonic Res. 11 (3), 123 (2015).

Published
2020-03-03
How to Cite
Hamid, L., Dwech, M., & Aadim, K. (2020). Influence of Laser Energy on the Optical Properties of Ag2S ITO Thin Films Prepared by the PLD Technique. Ukrainian Journal of Physics, 65(2), 179. https://doi.org/10.15407/ujpe65.2.179
Section
Structure of materials