Synergistic Use of Electrochemical Impedance Spectroscopy and Photoelectrochemical Measurements for Studying Solid State Properties of Anodic HfO2
- Autori: Santamaria, M.; Zaffora, A.; DI FRANCO, F.; Tranchida, G.; Habazaki, H.; DI QUARTO, F.
- Anno di pubblicazione: 2017
- Tipologia: Articolo in rivista (Articolo in rivista)
- OA Link: http://hdl.handle.net/10447/223416
Hafnium oxide and Nb doped HfO2 were grown by anodizing sputtering-deposited Hf and Hf-4at.%Nb. Photoelectrochemical characterization was carried out in order to estimate solid state properties such as band gap, flat band potential and electrons internal photoemission threshold energy as a function of thickness and composition of anodic oxides. Impedance measurements were performed in a wide range of electrode potentials in order to study the response of the anodic oxides under anodic and cathodic polarization and to estimate their dielectric constants.