Cation effects on the anodic dissolution of n-Si in fluoride electrolytes - Sorbonne Université Access content directly
Journal Articles Journal of Electroanalytical Chemistry Year : 1998

Cation effects on the anodic dissolution of n-Si in fluoride electrolytes

Abstract

Under strong illumination and in the anodic range, current–potential characteristics of n-Si ∣ fluoride-electrolyte interfaces exhibit the same shape as those of p-Si. The increase of the photocurrent observed in the presence of alkali-metal cations of increasing size is interpreted as for p-Si: in the electropolishing regime, cations act as catalysts for the dissolution of the silicon-oxide layer covering the electrode. In the dark, a negative flatband-potential shift and a decrease in the anodic current are observed in the presence of alkali-metal cations of increasing size. This behaviour, which takes place on hydrogenated surfaces, is accounted for in a kinetic model in which electrochemical transfer takes place through negatively-charged surface states. Cation adsorption favours the presence of a negative charge at the surface, hence the negative charge is increased, thereby decreasing the flatband potential and the charge-transfer rate.

Dates and versions

hal-04326140 , version 1 (06-12-2023)

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Cite

A. Belaı̈di, Babak Fotouhi, Hubert Cachet, T. Kerbache, A. Chari, et al.. Cation effects on the anodic dissolution of n-Si in fluoride electrolytes. Journal of Electroanalytical Chemistry, 1998, 455 (1-2), pp.191-195. ⟨10.1016/S0022-0728(98)00152-1⟩. ⟨hal-04326140⟩
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