Date

2010-01-01

Author

Suzer, Sefik
Sezen, Hikmet
Ertaş, Gülay
Dana, Aykutlu

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The technique of recording X-ray photoemission data while the sample rod is subjected to +/- 10.0V (dc) or square-wave pulses (ac) with varying frequencies in the range of 10(-3) to 10(3) HZ for probing charging/discharging dynamics of dielectric materials, is reviewed. Application of this technique introduces charging shifts as well as broadening of the peaks, which depend non-linearly on the polarity, as well as on the frequency of the pulses applied. These changes have been measured on: (i) an artificially created dielectric sample consisting of a Au metal strip connected externally to a series resistor of 1 M Omega and a parallel capacitor of 56 nF, and two real dielectric films; (ii) a 20 nm organic polystyrene film spin-coated on a silicon substrate; (iii) a 10 nm SiO(2) inorganic layer thermally grown on silicon. A simple circuit model is introduced to simulate the charging shifts and the peak broadenings. Although this simple model faithfully reproduces the charging shifts in all three cases, and also some of the broadenings for the artificial dielectric and the polystyrene film, the additional broadening in the negatively charged peaks of the SiO(2) dielectric film cannot be accounted for. It is also claimed that these experimental findings can be used for extracting material-specific dielectric properties.

Subject Keywords

Capacitance measurements using XPS, Resistance, Dielectric properties, Dynamical XPS, Differential charging

URI

https://hdl.handle.net/11511/47059

Collections

Department of Chemistry, Article