The Synthesis of NiOTiO2 Heterostructures and Their Valence Band Offset Determination

Abstract EN

In this work, a heterojunction based on p-type NiO/n-type TiO2 nanostructures has been prepared on the fluorine doped tin oxide (FTO) glass substrate by hydrothermal method.

Scanning electron microscopy (SEM) and X-Ray diffraction techniques were used for the morphological and crystalline arrays characterization.

The X-ray photoelectron spectroscopy was employed to determine the valence-band offset (VBO) of the NiO/TiO2 heterojunction prepared on FTO glass substrate.

The core levels of Ni 2p and Ti 2p were utilized to align the valence-band offset of p-type NiO/n-type TiO2 heterojunction.

The valence band offset was found to be ∼0.41 eV and the conduction band was calculated about ∼0.91 eV.

The ratio of conduction band offset and the valence-band offset was found to be 2.21.