6533b836fe1ef96bd12a1482
RESEARCH PRODUCT
Photoelectrochemical evidence of nitrogen incorporation during anodizing sputtering--deposited Al-Ta alloys.
Monica SantamariaHiroki HabazakiAndrea ZafforaF. Di QuartoF. Di Francosubject
AnodizingChemistry020209 energyAnalytical chemistryGeneral Physics and Astronomychemistry.chemical_elementNanotechnology02 engineering and technologyElectrolyteElectronDielectric021001 nanoscience & nanotechnologyNitrogenAnodePhysics and Astronomy (all)Settore ING-IND/23 - Chimica Fisica ApplicataSputtering0202 electrical engineering electronic engineering information engineeringDensity of statesPhysical and Theoretical Chemistry0210 nano-technologydescription
Anodic films were grown to 20 V on sputtering-deposited Al–Ta alloys in ammonium biborate and borate buffer solutions. According to glow discharge optical emission spectroscopy, anodizing in ammonium containing solution leads to the formation of N containing anodic layers. Impedance measurements did not evidence significant differences between the dielectric properties of the anodic films as a function of the anodizing electrolyte. Photoelectrochemical investigation allowed evidencing that N incorporation induces a red-shift in the light absorption threshold of the films due to the formation of allowed localized states inside their mobility gap. The estimated Fowler threshold for the internal photoemission processes of electrons resulted to be independent of the anodizing electrolyte confirming that N incorporation does not appreciably affect the density of states distribution close to the conduction band mobility edge. The transport of photogenerated carriers has been rationalized according to the Pai–Enck model of geminate recombination.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-12-01 | Physical chemistry chemical physics : PCCP |