Chalcogen, Transitional, Energy gap for direct transition, Kim

• Ba-Co-Ga-Se
• Ag-Co-Ga-Se-Zn
• Ba-Co-Ga-S
• Ag-Ga-Se-Zn
• Ba-Co-In-S
• chalcogen
• transitional
• conductor
• semiconductor
• quaternary
• tetragonal
• cubic
• orthorhombic
• hexagonal
• monoclinic