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Ternary semiconductors AB5C8 (A = Cu/Ag, B = In and C = S, Se or Te) have
been investigated. The CuIn5S8 and AgIn5S8 have been synthesize in cubic spinel
structure with space group (Fd3m), whereas CuIn5Se8, AgIn5Se8, CuIn5Te8
and AgIn5Te8 have tetragonal structures with space group P-42m. The relaxed
crystal geometry, electrical properties such as electronic band structure and
optoelectronic properties are predicted by using full potential method in this
work. For the determination of relaxed crystal geometry, the gradient approximation
(PBE-GGA) is used. All the studied compounds are semiconductors
based on their band structures in agreement with the experimental results,
and their bulk moduli are in the range 35 to 69 GPa. Wide absorption
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