As-Se, Chalcogen, Selenide, P121/c1

• As-Se-Tl
• As-K-P-Se
• As-Ba-K-Se
• As-Cs-P-Se
• structural properties
• optical properties
• electronic and electrical properties
• electronic energy gap
• phonons
• selenide
• chalcogen
• metalloid
• pnictogen
• non-disordered
• monoclinic