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Hydrogen induced effect on ZnTe/Co bilayer thin films

S. P. NEHRA1,2,* , M. S. DHAKA3, ANSHU SHARMA1, NEERAJ KUMAR4, RITU MALIK2, M. SINGH1

Affiliation

  1. Department of Physics, University of Rajasthan, Jaipur -302055, India
  2. Centre of Excellence for Energy and Environmental Studies, Deenbandhu Chhotu Ram University of Science and Technology, Murthal, Sonepat-131039, India
  3. Department of Physics, University College of Science, Mohanlal Sukhadia University, Udaipur-313001, India
  4. Tata Institute of Fundamental Research, Mumbai-400005, India

Abstract

Hydrogen is an amphoteric impurity and acts as a source of doping. It affects the electrical, optical and magnetic properties of materials. This paper reports the effect of hydrogen in electrical, optical and magnetic properties of ZnTe/Co bilayer thin films. These thin films were deposited on glass substrates using thermal evaporation technique. Hydrogenation has been incorporated at different pressure of hydrogen for half an hour under constant temperature of 333 K. Electrical, optical and magnetic properties of these films have been studied. The conductivity values have been found to be decreased from 3.04 x 10-4 Ω-1cm-1 to 2.42 x 10-4 Ω-1cm-1 and optical band gap values have been found to be increased from 3.33 eV to 3.38 eV due to hydrogen passivation effect. Presence of magnetic element has been confirmed by superconducting quantum interference device and X-ray diffraction measurements. Hydrogenation effect on these BLs thin films has also been confirmed using Raman Spectroscopy. Surface topography has been observed by optical microscopy..

Keywords

Bilayer thin films, Hydrogenation, I-V characteristics, Optical properties, Magnetization and surface topography.

Citation

S. P. NEHRA, M. S. DHAKA, ANSHU SHARMA, NEERAJ KUMAR, RITU MALIK, M. SINGH, Hydrogen induced effect on ZnTe/Co bilayer thin films, Optoelectronics and Advanced Materials - Rapid Communications, 8, 1-2, January-February 2014, pp.143-148 (2014).

Submitted at: Aug. 23, 2013

Accepted at: Jan. 22, 2014