Abstract
Optical spectroscopy has been performed on samples grown by molecular beam epitaxy on the (0 0 1) surface of ZnTe substrates, all basically consisting of ∼ 38 nm wide ZnTe (Zn,Mg)Te quantum wells, in which five separate monolayers containing cadmium atoms have been inserted, equally spaced by 20 monolayers of ZnTe, along the growth axis. Two samples are presented, containing five half CdTe monolayers deposited, respectively, by molecular beam epitaxy (yielding wide flat islands of CdTe separated by wide ZnTe areas), and by atomic layer epitaxy (yielding a quasi-homogeneous planar distribution of cadmium atoms). The inserts introduce two spectral features corresponding to heavy- and light-hole excitons trapped on CdTe which acts as a potential well for electrons and both types of holes. The ground exciton yields a very efficient photoluminescence, a few meV below the excitonic gap of ZnTe. The fine structure of photoluminescence spectra reveals the presence of a low-energy feature assigned to a X − excitonic complex. The temperature dependence of the emission intensity is also studied.
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