Lattice relaxation ofDX-like donors inZnxCd1−xTe

Abstract

The configuration-coordinate diagram was constructed for deep relaxed In impurities in ${\mathrm{Zn}}_{\mathrm{x}}$ ${\mathrm{Cd}}_{1\mathrm{-}\mathrm{x}}$Te. On the basis of the Hall effect, deep-level transient spectroscopy, photoionization, and photoluminescence measurements it was shown that In donors in ${\mathrm{Zn}}_{\mathrm{x}}$ ${\mathrm{Cd}}_{1\mathrm{-}\mathrm{x}}$Te possess analogous properties to the so-called DX center in ${\mathrm{Al}}_{\mathrm{x}}$ ${\mathrm{Ga}}_{1\mathrm{-}\mathrm{x}}$As. The absence of paramagnetic resonance from In donors suggests that In atoms form a mixture of ${\mathrm{In}}^{+}$ and ${\mathrm{In}}^{3+}$ ions, in equal numbers. A persistent photo-EPR signal from mobile photoelectrons was observed after illumination at g=1.316 and could be thermally annealed. A strong broad, donor-acceptor-pair luminescence was found, with periodically spaced phonon lines at high excitation powers.