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.

Zaffora, A., Santamaria, M., DI FRANCO, F., Habazaki, H., DI QUARTO, F. (2016). Photoelectrochemical evidence of nitrogen incorporation during anodizing sputtering-deposited Al-Ta alloys. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 18(1), 351-360 [10.1039/c5cp04347f].

Photoelectrochemical evidence of nitrogen incorporation during anodizing sputtering-deposited Al-Ta alloys

Zaffora, Andrea;SANTAMARIA, Monica;DI FRANCO, Francesco;DI QUARTO, Francesco
2016-01-01

Abstract

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.
Settore ING-IND/23 - Chimica Fisica Applicata
http://www.rsc.org/Publishing/Journals/CP/index.asp
Zaffora, A., Santamaria, M., DI FRANCO, F., Habazaki, H., DI QUARTO, F. (2016). Photoelectrochemical evidence of nitrogen incorporation during anodizing sputtering-deposited Al-Ta alloys. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 18(1), 351-360 [10.1039/c5cp04347f].
File in questo prodotto:
File Dimensione Formato  
PaperNAlTa.pdf

Solo gestori archvio

Dimensione 3.07 MB
Formato Adobe PDF
3.07 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/189656
Citazioni
  • ???jsp.display-item.citation.pmc??? 2
  • Scopus 21
  • ???jsp.display-item.citation.isi??? 19
social impact