Relevance of Microstructure on Optical Properties of Thermally Evaporated Indium Oxide Thin Films

Parveen Jain^1,2, Sukhvir Singh^1*, Avanish Kumar Srivastava¹, Sandeep Kumar Pundir¹, Azher Majid Siddiqui²

¹CSIR-National Physical laboratory, New Delhi, India.
²Jamia Millia Islamia, New Delhi, India.

DOI: 10.4236/oalib.1101200                

Abstract

Nanocrystalline indium oxide thin films of thickness about 100 nm have been deposited using thermal vacuum evaporation technique at room temperature on glass and quartz substrates and subsequently annealed at different temperatures (150℃, 200℃, 250℃, 300℃, 350℃, 500℃ and 700℃) for 2 hr and 4 hr in the oxygen atmosphere. Structural and optical properties of these films have been investigated by using XRD, SEM, HRTEM, AFM, UV-Visible, and photoluminescence spectroscopy. Response of gas towards the thin films is obtained. X-ray diffraction studies of deposited and annealed films show the transformation of indium into indium oxide thin films at 300℃. UV-visible and PL studies reveal the band gap of 3.7 eV. The transparency of thin films is about 83%. Gas response is obtained 3.55 for ethanol vapours. Structural features associated with the indium oxide thin films have been correlated with optical parameters.

Keywords

Vacuum Evaporation, Photoluminescence, UV-Visible, Gas Sensing

Conflicts of Interest

The authors declare no conflicts of interest.

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