Stoichiometry of Zinc Blende Face Atoms (6*112=3) T Holes Corner Atoms (4*1=4) (8*118=1) 4 Lattice Atoms:4 Tetrahedral Holes 1:1 Stoichiometry (GaAs,InP,CdS,ZnS) XIl-2Stoichiometry of Zinc Blende 4 Lattice Atoms: 4 Tetrahedral Holes 1:1 Stoichiometry (GaAs, InP, CdS, ZnS) Corner Atoms (8 * 1/8 = 1) Face Atoms (6 * 1/2 = 3) Td Holes (4 * 1 = 4) XIII-2