Ab initio calculations of the properties of defective CsSnCl3: The role of anion-cation pair defect

David O. Obada, Simeon A. Abolade, Syam Kumar R., Aniekan M. Ukpong, Akinlolu Akande

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

In this study, first principles calculations based on density functional theory (DFT) was used to simulate the geometric structures, electronic, optical, and mechanical properties, of inorganic CsSnCl3 perovskites with and without an anion-cation pair defect (Sn and Cl vacancy). The data establishes that the introduction of vacancies induce a trap state which narrows the band gap. The formation of the observed trap states can be ascribed to the orbital hybridization of the Sn atoms near the vacancy site. In addition, the defective CsSnCl3 perovskite showed better light absorption in the visible region than its pristine counterpart owing to a reduced band gap. The mechanical properties predicted the pristine and defective CsSnCl3 perovskites to be mechanically stable.

Original languageEnglish
Article number116262
JournalSolid State Ionics
Volume399
DOIs
Publication statusPublished - 15 Oct 2023

Keywords

  • Crystal structure
  • DFT
  • Defects
  • Elastic properties
  • Optical materials
  • Semiconductors
  • Vacancies

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