A voltammetric study on the atomic layer deposition of selenium and antimony on platinum electrode
Résumé
The present paper is a detailed study on the on the atomic layer deposition of selenium and antimony
on platinum electrode by electrochemical atomic layer epitaxy (EC-ALE). Voltammetry and coulometry experiments
were performed in this work to investigate the electrochemial behaviors of selenium and antimony on the
polycrystalline platinum electrode. The results show that on Pt substrates Se ions can directly form a UPD layer
with full coverage without the formation of bulk Se. The total Faradaic charge of the UPD Se is calculated to be
924 μC cm−2. A Pt electrode adsorbed irreversibly with SbO+ species is obtained by introducing the fresh Sb solution
continuously into the electrochemical cell. The irreversibly adsorbed SbO+ species begin to desorb when the
potential is more positive than 0.50 V. The reduction potential of irreversibly adsorbed SbO+ to metallic Sb atoms
amounts to 0.11 V. After the irreversibly adsorbed SbO+ species are reduced to metallic Sb, Sb atoms can be
further deposited onto this Sb-modified Pt electrode in the way of UPD to increase the coverage of the metallic Sb
monolayer. The UPD potential of antimony on the Sb-modified Pt electrode amounts to −0.07 V. Finally, a Sb
monolayer with the depositing charge 981 μC cm−2 is obtained. Now the alternative deposition of Sb-Se compound
by EC-ALE method is under study.
Domaines
MatériauxOrigine | Fichiers produits par l'(les) auteur(s) |
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