Long-range order in CdZnTe epilayers

We report the evidence of long-range order (LRO) in CdZnTe epilayers grown by metal organic chemical vapour deposition (MOCVD) on (100) CdTe. LRO has been characterized by both transmission electron microscopy (TEM) and polarized photoluminescence (PL) measurements. The observation of extra-spots in the diffraction pattern of Cd0.52Zn0.48Te samples indicate the CuPt type structure, as corroborated by computer simulation. Valence band splitting (VBS) up to 25 meV, measured by polarized PL gives additional proof of atomic ordering. The order parameter eta = 0.6 was calculated from VBS using a parabolic approximation.