Abstract
4.2 K Photoluminescence (PL) bands with unusual spectral properties have been observed and identified in high purity low-temperature-grown bulk polycrystalline CdTe. Two sharp bands dominate at about 1.300 and 1.355 eV in p- and n-type samples respectively (Z centre). Detailed PL studies including time-resolved measurements are used to define the precise Z 0/+ energy level in the gap: E c − 251 meV or E v +1.355 eV . By varying the excitation wavelength we find a strong transformation of the PL spectrum which allows us to compare the shape of the two spectral regions: 1.24–1.36 eV and 1.45–1.57 eV associated with Z-acceptor and conventional donor acceptor recombination respectively. In this way we defined the second ( Z −/0 transiition): E c − 206 meV or E v + 1.400 eV . The PL properties of the Z centre, a laser microprobe mass analysis investigation and correlation with a spin-polarized tight-binding model allow us to suggest that the Z centre originates from a 3d impurity on a Cd site, most probably Cu.
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