Electron-spin-resonance analysis of the deep donors lead, tin, and germanium in CdTe

Electron-spin resonance has been used to study the singly ionized donor states of cation-substitutional lead, ${\mathrm{Pb}}^{3+}$(6$s^1$), tin, ${\mathrm{Sn}}^{3+}$(5$s^1$), and germanium, ${\mathrm{Ge}}^{3+}$(4$s^1$) in CdTe. A linear combination of atomic orbitals and molecular orbitals analysis of the ${}_{}{}^{125}{}_{}{}^{}\mathrm{Te}$ ligand hyperfine-structure data reveals that in all cases the unpaired electron is strongly localized within the first Te-ligand shell around the group-IV impurity. From this it is concluded that cation-substitutional Pb, Sn, and Ge form deep donor states in CdTe.