ELECTRONIC-STRUCTURE OF SRTIO3 NANOCRYSTALLITE THIN-FILM AT HIGH-TEMPERATURE

The electronic structure and surface composition of SrTiO3 nanocrystal lite thin film at different temperature were studied by ultraviolet ph otoelectron spectroscopy and x-ray photoelectron spectroscopy, respect ively The electronic structure strongly depends on temperature and at high temperature is similar to that of single crystal. As the sample t emperature falling down from high temperature, the valence band spectr a of SrTiO3 nanocrystallite thin film shift to high binding energy and become weak rapidly; an opposite process was observed when temperatur e rising up. This interesting phenomenon was explained on the basis of the thermodynamic equilibrium process near grain boundaries that lead s to redistribution of anions and cations and forming charged grain bo undaries.