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Electronic structure of antimony selenide (Sb 2 Se 3 ) from GW calculations
Author(s) -
Vadapoo Rajasekarakumar,
Krishnan Sridevi,
Yilmaz Hulusi,
Marin Carlos
Publication year - 2011
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201046225
Subject(s) - antimony , selenide , band gap , electronic structure , density functional theory , electronic band structure , semimetal , condensed matter physics , direct and indirect band gaps , pseudopotential , density of states , materials science , lattice (music) , chemistry , computational chemistry , physics , inorganic chemistry , selenium , acoustics , metallurgy
Antimony selenide (Sb 2 Se 3 ) has been proposed as an alternative material for a wide range of applications; however, the electronic structure of the Sb 2 Se 3 lattice is not clearly known yet. As a consequence, there are abundant contradictory interpretations of experimental results leading to incoherent determinations of its energy band gap and the type of optical transitions. Moreover, Sb 2 Se 3 is recently being synthesized in different types of nanostructures; therefore, detailed knowledge of the bulk electronic structure is necessary to evaluate deviations due to confinement or surface effects. In this paper, we study the electronic band structure of antimony selenide using density functional theory (DFT) within the generalized gradient approximation (GGA) with GW corrections. Our calculations show that Sb 2 Se 3 has an indirect energy band gap of 1.21 eV; however, a direct transition only 0.01 eV higher than the band gap (1.22 eV) is also possible. The calculated density of states agrees well with the experiments reporting photoemission spectra.