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RESEARCH PRODUCT
The Influence of Thermal Treatment on the Electronic Properties of a-Nb2O5
Fabio La MantiaMonica SantamariaHiroki HabazakiFrancesco Di Quartosubject
PhotocurrentAdmittanceMaterials scienceDifferential capacitanceBand gapAnalytical chemistryOxideThermal treatmentDielectricThermal Treatment Electronic Properties a-Nb2O5Amorphous solidchemistry.chemical_compoundSettore ING-IND/23 - Chimica Fisica ApplicatachemistryNb2O5 anodic oxide electronic propertiesdescription
The effect of thermal treatments for 1h at 250{degree sign}C in air or under vacuum on the electronic structure of thick amorphous anodic niobia was characterized by electrochemical impedance, differential admittance (DA) and photocurrent spectroscopy (PCS). The analysis of anodized niobia has revealed that it behaves as a pure dielectric. The thermal treatment in air increases the value of the differential capacitance of the niobia sample. The effect is stronger when the thermal treatment is carried out in vacuum and can be cancelled out by reanodizing the oxide to the initial formation potential. In the case of thermally vacuum-treated sample, a behavior typical of semiconducting amorphous material has been revealed at different frequencies. The PCS measurements were used to derive the optical band gap value of niobia sample and to confirm the location of the flat band potential derived from admittance data.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-01-01 |