Stability Investigation in the Optical Properties of Thermally Evaporated Ge5Se95-x Znx Thin Films

  • Austine Amukayia Mulama Maseno University Department of Physics and Materials Science P.O BOX 333-40105 MASENO-KENYA
  • Julius Mwakondo Mwabora University of Nairobi P.O BOX 30197-00100 Nairobi
  • Andrew Odhiambo Oduor Maseno University P.O BOX 333-40105 Maseno
  • Cosmas Mulwa Muiva Botswana International University of Science and Technology P.O BOX 00741 Gaborone
  • Boniface Muthoka University of Nairobi P.O BOX 30197-00100 Nairobi
  • Drinold Aluda Mbete Masinde Muliro University of Science and Technology P.O BOX 190-50100 Kakamega
  • Betty Namatsi Amukayia Maseno University & Chamakanga Girls High School P.O BOX 157-50302 Chamakanga
Keywords: Thermal evaporation, Ge-Se-Zn alloy, optical characterization.

Abstract

Selenium-based chalcogenides are useful in telecommunication devices like infrared optics and threshold switching devices. The investigated system of Ge5Se95-xZnx (0.0 ‰¤ x ‰¤ 4 at.%) has been prepared from high purity constituent elements. Thin films from the bulk material were deposited by vacuum thermal evaporation. Optical absorbance measurements have been performed on the as-deposited thin films using transmission spectra. The allowed optical transition was found to be indirect and the corresponding band gap energy determined. The variation of optical band gap energy with the average coordination number has also been investigated based on the chemical bonding between the constituents and the rigidity behaviour of the systems network.

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Author Biographies

Austine Amukayia Mulama, Maseno University Department of Physics and Materials Science P.O BOX 333-40105 MASENO-KENYA

Ph. D student

Tutorial Fellow in the Department of Physics and Materials Science.

Julius Mwakondo Mwabora, University of Nairobi P.O BOX 30197-00100 Nairobi

Professor & Chairman of Department of Physics

Andrew Odhiambo Oduor, Maseno University P.O BOX 333-40105 Maseno
Associate Professor & Chairman of Department of Physics and Materials Science
Cosmas Mulwa Muiva, Botswana International University of Science and Technology P.O BOX 00741 Gaborone
Dr. & Lecturer at Department of Physics
Boniface Muthoka, University of Nairobi P.O BOX 30197-00100 Nairobi

Chief Technologist and Part-time Lecturer at Department of Physics

 

Drinold Aluda Mbete, Masinde Muliro University of Science and Technology P.O BOX 190-50100 Kakamega
PhD student and part-time lecturer at Department of Mathematics
Betty Namatsi Amukayia, Maseno University & Chamakanga Girls High School P.O BOX 157-50302 Chamakanga

Senior teacher at Chamakanga Girls High School (Physics)

                        &

Master student at Maseno University at Department of Physics

Published
2015-02-20
How to Cite
Mulama, A., Mwabora, J., Oduor, A., Muiva, C., Muthoka, B., Mbete, D., & Amukayia, B. (2015). Stability Investigation in the Optical Properties of Thermally Evaporated Ge5Se95-x Znx Thin Films. JOURNAL OF ADVANCES IN PHYSICS, 7(3), 1923-1930. https://doi.org/10.24297/jap.v7i3.1581
Section
Articles