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X-ray photoelectron spectroscopy investigation of MgAl2O4 thin films for humidity sensors

Published online by Cambridge University Press:  03 March 2011

Giulia Mattogno ,
Guido Righini ,
Giampiero Montesperelli  and
Enrico Traversa
Giulia Mattogno
Affiliation:
C.N.R., Istituto di Chimica dei Materiali, C.P. 10, 00016 Monterotondo Stazione, Rome, Italy
Guido Righini
Affiliation:
C.N.R., Istituto di Chimica dei Materiali, C.P. 10, 00016 Monterotondo Stazione, Rome, Italy
Giampiero Montesperelli
Affiliation:
Dipartimento di Scienze e Tecnologie Chimiche, Universitá di Roma “Tor Vergata”, Via della Ricerca Scientifica, 00133 Rome, Italy
Enrico Traversa
Affiliation:
Dipartimento di Scienze e Tecnologie Chimiche, Universitá di Roma “Tor Vergata”, Via della Ricerca Scientifica, 00133 Rome, Italy
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Abstract

MgAl2O4 thin films, to be studied as active elements for humidity sensors, were deposited on Si/SiO2 substrates by radio-frequency sputtering. This paper discusses the x-ray photoelectron spectroscopy (XPS) investigation of these films. XPS demonstrated that the thin films had a stoichiometry close to that of MgAl2O4. The evaluation of the modified Auger parameter α' for Al gave structural information about the order of the crystalline structure of the thin films. The combination of Ar+ ion etching and XPS analysis showed the simultaneous presence of Mg, Al, and Si at the film-substrate interface. The thicknesses of the interfaces were calculated between 7 and 10 nm. The analysis of the binding energy (b.e.) values of the XPS peaks at different etching depths showed that O 1s and Si 2p b.e. values were characteristic of a silicate at the interface, whereas in the substrate they were typical of silica. This suggests a chemical interaction took place between film and substrate with the formation of a silicate layer at the interface, which may be the cause of the good adhesion of MgAl2O4 films to silica, as observed by peel tests with Scotch tape.

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Articles
Information
Journal of Materials Research , Volume 9 , Issue 6 , June 1994 , pp. 1426 - 1433
Copyright
Copyright © Materials Research Society 1994

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