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Structural transition and blue emission in textured and highly transparent spray deposited Li doped WO3 thin films |
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| Authors: | M. Kovendhan D. Paul JosephE. Senthil Kumar A. SendilkumarP. Manimuthu S. SambasivamC. Venkateswaran R. Mohan |
| Affiliation: | a Department of Physics, Presidency College, Chennai 600 005, India b Centre for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan c Department of Physics, Indian Institute of Technology Madras, Chennai 600 035, India d School of Physics, University of Hyderabad, Hyderabad, 500 046, India e Materials Science Centre, Department of Nuclear Physics, University of Madras, Guindy Campus, Chennai 600 025, India f Department of Physics, Pukyong National University, Busan 608 737, South Korea |
| Abstract: | The effect of Li (0-5 wt%) doping on the properties of WO3 thin films deposited using an automated homemade spray pyrolysis unit is studied. Change in structural and optical properties is observed on doping with Li. The XRD patterns shows that undoped WO3 film has an orthorhombic phase while the Li (1-5 wt%) doped WO3 films have tetragonal phase. The SEM and AFM images confirm relatively smooth surface of Li doped WO3 films compared to undoped WO3 film. Transmission spectra reveal that the transparency of the Li-doped films is much greater than that of undoped film. From the transmission data, the direct, indirect bandgap and phonon energies were calculated. Room temperature photoluminescence spectra showed pronounced blue emission on doping with Li. |
| Keywords: | Spray pyrolysis Tungsten oxide Lithium Textured growth Optical transparency Photoluminescence |
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