COMPLEX-FORMATION AT INDIUM DONORS IN P-CDTE

After diffusion of silver into p-CdTe at room temperature, two electri c field gradients (EFG) are observed at In-111/Cd-111 probe atoms at T = 77 K: nu(Q1) = 61 MHz, eta(1) = 0.15 and nu(Q2) = 30 MHz, eta(2) = 0.46. The assignment of EFG(1) to In-A centers leads to the conclusion that the 0/ - level of the Cd-vacancy is located deeper in the band g ap than the shallow doping and that the two EFGs are caused by the neu tral and singly negative Cd-vacancy. The reason for In-A center format ion and subsequent dissociation (aging) after Ag diffusion is explaine d.