Energy gap for direct transition, Quaternary

• Ba-Bi-O-V
• Cd-Co-Ga-Se
• Ba-In-O-P
• Cd-Cs-Se-Y
• Cs-Tb-Te-Zn
• quaternary
• chalcogen
• transitional
• conductor
• semiconductor
• orthorhombic
• tetragonal
• monoclinic
• cubic
• trigonal