Theoretical consideration of recently proposed ordered stoichiometric and oxygen-deficient (110) surfaces of (formula presented) crystal with (formula presented) (formula presented) (formula presented) and (formula presented) symmetries have been done. We use a first-principles density-functional method and plane-wave basis, combined with pseudopotentials to calculate surface electronic structures, surface geometries, and energetics. Calculated surface formation energies suggest that stability of the oxygen-deficient surfaces decrease with increasing oxygen deficiency. At oxygen-deficient (formula presented) and (formula presented) surfaces tin atoms similar to those in SnO crystal were found to appear. In all cases, the highest occupied orbitals were considerably localized at the sites of surface oxygen vacancies. The (formula presented) added row surface structures were found to be relatively stable and associated with the decrease of the band gap due to jagged surface. Also, ultraviolet optical absorption coefficients for different surface structures were determined by using the electric dipole approximation with a scissor correction.
|Julkaisu||Physical Review B - Condensed Matter and Materials Physics|
|DOI - pysyväislinkit|
|Tila||Julkaistu - 2002|
|OKM-julkaisutyyppi||A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä|
!!ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics