Semiconductor behavior of halide perovskites AGeX3 (A = K, Rb and Cs; X = F, Cl and Br): first-principles calculations

  • Mohammed Houari
  • Bouabdellah BouadjemiEmail author
  • Slimane Haid
  • Mohamed Matougui
  • Tayeb Lantri
  • Zoubir Aziz
  • Samir Bentata
  • Bachir Bouhafs
Original Paper


The structural, elastic and optoelectronic properties for cubic halide perovskites AGeX3 (A = K, Rb and Cs, X = F, Cl and Br) have been successfully studied in this paper, using the density functional theory with the generalized gradient approximation of Perdew–Burke–Ernzerhof (GGA-PBE). The modified Becke–Johnson (mBJ-GGA) potential approximation was used to describe the band structure more accurately. The calculated band structure from mBJ gives appropriate optoelectronic properties of these materials. Band structure calculations reveal a semiconducting behavior with a direct band gap at the R-point in the reciprocal lattice space, with values lying between 0.79 and 2.87 eV. The compounds of interest are mechanically stable, anisotropic and ductile in nature. The optical properties indicate that these compounds can be used in various optoelectronic devices operating in the visible and ultraviolet energies. To the best of our knowledge, this is the first quantitative theoretical prediction of the elastic, electronic and optical properties for these compounds which still awaits experimental confirmation.


Density functional theory FP-LAPW Halide perovskites Elastic properties 


75.40.Mg 74.25.Jb 74.25.Gz 42.25.Bs 78.20.Ci 78.40.Fy 



I extend my thanks to Prof. Dr. Eng. Rabah KHENATA, Head of LPQ3M-Laboratory, Faculty of Sciences & Technology, Mascara University, 29000, Algeria. I thank him for helping me, giving guidance and advice.


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Copyright information

© Indian Association for the Cultivation of Science 2019

Authors and Affiliations

  1. 1.Laboratory of Technology and of Solids PropertiesAbdelhamid Ibn Badis UniversityMostaganemAlgeria
  2. 2.Mustapha Stambouli University of MascaraMascaraAlgeria
  3. 3.Laboratory of Modelling and Simulation in Materials ScienceDjillali Liabès University of Sidi Bel-AbbèsSidi Bel AbbèsAlgeria

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