Effect of Doping Concentration on the Optical Properties of Indium-Doped Gallium Arsenide Thin FILMS

  • Md Saiful Islam Department of Physics, University of Dhaka, Dhaka
  • Chitra Das Department of Mathematics & Natural Sciences, BRAC University, Dhaka
  • Mehnaz Sharmin Department of Physics, Bangladesh University of Engineering & Technology, Dhaka
  • Kazi Md Amzad Hussain Experimental Physics Division, Atomic Energy Centre, Dhaka
  • Shamima Choudhury Department of Physics, University of Dhaka, Dhaka
Keywords: Doping concentration, Optical properties, GaAs thin films

Abstract

Effects of indium doping (concentration 0.2, 0.3 and 0.4%) on the optical properties of GaAs thin films were studied. Thin films of 600 nm were grown onto chemically and ultrasonically cleaned glass substrate by thermal evaporation method in high vacuum (~10-4 Pa) at 50°C fixed substrate temperature. The samples were annealed for 15 minutes at a fixed temperature of 200°C. The thicknesses of films were being measured in situ by a quartz crystal thickness monitor during deposition. The transmittance and reflectance data were found using UV-VIS-NIR spectrophotometer in the photon wavelength range of 310 ~ 2500 nm. These data were utilized to compute the absorption coefficient, refractive index, extinction co-efficient and band gap energy of the studied films. Here transmittance was found 78 for 0.2% indium doping concentration. The band gap energy decreased with the increase of doping concentration.

Journal of Bangladesh Academy of Sciences, Vol. 40, No. 2, 179-186, 2016

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Author Biography

Md Saiful Islam, Department of Physics, University of Dhaka, Dhaka


Published
2016-12-22
How to Cite
Islam, M. S., Das, C., Sharmin, M., Hussain, K., & Choudhury, S. (2016). Effect of Doping Concentration on the Optical Properties of Indium-Doped Gallium Arsenide Thin FILMS. Journal of Bangladesh Academy of Sciences, 40(2), 179-186. https://doi.org/10.3329/jbas.v40i2.30773
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Articles