• R Vinodkumar

      Articles written in Pramana – Journal of Physics

    • Effect of ZnO doping on the structural and optical properties of BaWO 4 thin films prepared using pulsed laser ablation technique

      N Venugopalan Pillai R Vinodkumar V Ganesan Peter Koshy V P Mahadevan Pillai

      More Details Abstract Fulltext PDF

      BaWO4 doped with ZnO (2, 3, 5, 7 and 10 wt%) nanostructured films are prepared on quartz substrates by pulsed laser ablation. The films are post annealed at 900°C. GIXRD analysis of the post-annealed films reveal the change of orientation of scheelite tetragonal crystal growth from 1 1 2 reflection plane to 0 0 4 planes when doping concentration is more than 3 wt%. The AFM images show that film with 7 wt% ZnO doping concentration has good ceramic pattern with surface features giving a minimum value of rms surface roughness suitable for optoelectronic device applications. The optical transmittance and band-gap energy of the films are found to decrease considerably on post-annealing which can be due to the increase in grain size of the crystallites on annealing. Thus doping with ZnO improves the surface features of the films and increases the optical band-gap energy.

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