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Synthesis of α-WO3 Thin Film Using Pulsed Laser Deposition: Influence of Thickness on Optical and Electrical Properties

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Abstract

The present study reports the systematic study on the effect of film thickness on the optical and electrical properties of transparent tetragonal (α) WO3 phase, synthesized using pulsed laser deposition. The WO3 films of various thicknesses 250 ± 4 (S1), 350 ± 2 (S2), 750 ± 5 (S3) and 1150 ± 4 (S4) nm were obtained by varying the deposition time 8, 15, 30 and 60 min, respectively. The films were post-annealed at 500 °C for 1 h in the open atmosphere and extensively characterized using X-ray diffraction (XRD), atomic force microscopy (AFM), Raman spectroscopy, UV–Vis–NIR spectrophotometer and four-probe resistivity. The Rietveld analysis of XRD pattern revealed the presence of mixed orthorhombic and tetragonal crystalline phases in the S1 (250 ± 4 nm) film. A pure tetragonal crystalline phase of WO3 was observed in rest of the films. The Raman spectroscopic study also revealed the high-temperature WO3 phase formation. The grain size and surface roughness obtained from the AFM micrographs varied from 10 to 50 nm and 9.1 to 10.9 nm, respectively. The optical band gaps were found to decrease as 3.47, 3.28, 3.08 and 3.06 eV with the increase in the film thickness S1, S2, S3 and S4, respectively. The resistivity of the films was found to increase with an increase in film thickness. However, the decrease in the resistivity with an increase in the temperature revealed the semiconducting behavior of all the films. The activation energy was found to increase with the increase in the thickness of α-WO3 film.

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Acknowledgements

The authors thank Dr. S. Raju, Head PMD/MCG/IGCAR, and Dr. Saroja Saibaba, Associate Director MCG/IGCAR, for their constant encouragement and motivation during the project. Experimental support rendered by Ms. M. Jyothi and Dr. Niranjan Kumar (SND/MSG/IGCAR) is acknowledged.

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Authors and Affiliations

  1. XRDSES, Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India

    Baban P. Dhonge, Akash Singh, Arun Kumar Panda, R. Thirumurugesan & P. Parameswaran

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  1. Baban P. Dhonge
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  2. Akash Singh
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  3. Arun Kumar Panda
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  4. R. Thirumurugesan
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Correspondence to Baban P. Dhonge.

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Dhonge, B.P., Singh, A., Panda, A.K. et al. Synthesis of α-WO3 Thin Film Using Pulsed Laser Deposition: Influence of Thickness on Optical and Electrical Properties. Trans Indian Inst Met 72, 733–740 (2019). https://doi.org/10.1007/s12666-018-1525-3

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