Articles
  • Metal-ion dependent band energetics in SrM0.5Ti0.5O3 (M = Ru, Rh, Ir, Pt, Pd) like structures for solar applications
  • E. D. Jeonga, J. S. Jina, H. J. Kima, T. E. Honga, C. R. Chob, K. T. Limc, H. G. Kima,* and P. H. Borsed,*
  • a Korea Basic Science Institute, Busan 609-735 and Daejeon 305-333, Korea b Department of Nano Fusion Technology, Pusan National University, Pusan 609-735, Korea c Department of Imaging System Engineering, Pukyong National University, Busan 609-735, Korea d Centre for Nanomaterials, International Advanced Research Centre for Powder Metallurgy and New Materials (ARC International), Balapur PO, Hyderabad, AP, 500 005, India
Abstract
We present here a detailed comparative study of the theoretically-calculated electronic structures of the cubic Sr M0.5Ti0.5O3 (M: Ru, Rh, Ir, Pt, Pd) type and SrTiO3 system. A their full potential linearized augmented plane wave (FP-LAPW) method was used to obtain its band structure within the framework of a density functional theory by using Wien97 code. The 4d orbitals of Ru, Rh and 5d orbitals of Ir, Pt respectively, contribute to the top of the valence band yielding a band gap narrowing of cubic SrTiO3. The computed tolerance factor for the SrTi0.5Pd0.5O3 perovskite structure indicates an unstable structural formation with Pd metal ion. The computation of the frequency-dependent absorption coefficient I(ω) of SrTi0.5M0.5O3 indicates that Rh has a significant absorption efficiency for low energy (E ≤ 2ev) photons, whereas Ru and Ir display a very high absorption efficiency for photons with E > 2eV. Theoretical prediction validates that Rh can yield a better solar photoactive material than Ru and Ir in the SrTi0.5M0.5O3 (M:Ru, Rh, Ir) type system for low energy photon applications

Keywords: Sr M0.5Ti0.5O3, FP-LAPW Method, SrTiO3, Solar Photoactive Material, Partial Density of States.

This Article

  • 2011; 12(6): 712-715

    Published on Dec 31, 2011