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  Sci. Lett. J. 2012, 1: 16  
  Research Article
  Full Text
Structure, electronic and optical properties of tin sulfide  
  V. L. Shaposhnikova, A. V. Krivosheevaa, V. E. Borisenkoa, J.-L. Lazzarib  
     
a Belarusian State University of Informatics and Radioelectronics, P. Browka 6, 220013 Minsk, Belarus
b Centre Interdisciplinaire de Nanoscience de Marseille, UMR 7325 CNRS – Aix-Marseille Université, Case 913, Campus de Luminy, 13288 Marseille cedex 9, France

   
  Abstract  
  Structural, electronic and optical properties of different phases of tin sulfide SnSx (1 = x = 2) have been theoretically estimated by modern potential and approximation techniques (modified Becke-Johnson, GW approximation) beyond the density functional theory. All phases were found to be indirect-gap semiconductors. The room-temperature simple orthorhombic a-phase of SnS is characterized by the energy gap of about 1.2–1.6 eV, while the high-temperature C-centered orthorhombic ß SnS has a smaller gap of about 0.6 eV. The cubic phases which were experimentally observed in thin films possess a gap of about 0.7 eV, while the largest band gap, i.e. 2.4 2.9 eV, was found for hexagonal phases of SnS2. The averaged absorption coefficients (> 105 cm-1 in the visible spectrum) of cubic or orthorhombic phases of SnS were found to be around one order of magnitude with that of GaAs. This shows a-phase of SnS to be promising for photovoltaic applications.  
     
  Keywords  
  Tin sulfide; Band structure; Photovoltaics; Absorption coefficient  
     
   
     
 
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