Author/Authors :
Y Mori، نويسنده , , S Tanemura، نويسنده , , S Koide، نويسنده , , Y Senzaki، نويسنده , , P Jin، نويسنده , , K Kaneko، نويسنده , , A Terai، نويسنده , , N Nabotova-Gabin، نويسنده ,
Abstract :
We observed new “thermo-coloration” of the surface layer of SmS film in which it turned from blue-black to gold after annealing at 650 °C for 1 h in vacuum. X-ray photoelectron spectroscopy (XPS) was applied to investigate the chemical state of SmS. This phenomenon is different from the previously reported works. The contribution of Sm3+ state dramatically increased upon annealing. This implied that SmS film changes from semiconductor phase to the metal one and Sm oxide. Consequently, it is suggested that new thermo-coloration of SmS film is caused by the phase transition from semiconductor to metal under the presence of Sm oxide.
Keywords :
Phase transition , Thermo-coloration , SmS thin film , XPS , Se , Sm valence state
