Alkali, Non-disordered, Transitional, Energy gap for direct transition

• Cl-K-Zn
• As-K-Zn
• Ag-C-Cs
• Cd-Cs-Se-Y
• Cs-Hg-Se-Y
• non-disordered
• transitional
• alkali
• chalcogen
• ternary
• orthorhombic
• tetragonal
• trigonal
• cubic
• hexagonal