“…Next, they were oxidized in a horizontal tube furnace by annealing in an oxygen flow for 2 h at 500 1C. Our annealing time exceeds rapid annealing used for ZnTe films (1-25 min) [35,36] and is comparable to the long annealing (1-5 h) applied toward ZnS [44,45] and Zn x N y [46][47][48] films to assure full transformation of ZnSe into the ZnO. Thickness of ZnSe films was varied between 300 nm and 1 mm.…”