Controlling the Er content of porous silicon using the doping current intensity

Guido Mula, Lucy Loddo, Elisa Pinna, Maria V Tiddia, Michele Mascia, Simonetta Palmas, Roberta Ruffilli, Andrea Falqui

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The results of an investigation on the Er doping of porous silicon are presented. Electrochemical impedance spectroscopy, optical reflectivity, and spatially resolved energy dispersive spectroscopy (EDS) coupled to scanning electron microscopy measurements were used to investigate on the transient during the first stages of constant current Er doping. Depending on the applied current intensity, the voltage transient displays two very different behaviors, signature of two different chemical processes. The measurements show that, for equal transferred charge and identical porous silicon (PSi) layers, the applied current intensity also influences the final Er content. An interpretative model is proposed in order to describe the two distinct chemical processes. The results can be useful for a better control over the doping process.
Original languageEnglish (US)
Pages (from-to)1-7
Number of pages7
JournalNanoscale Research Letters
Volume9
Issue number1
DOIs
StatePublished - Jul 4 2014

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