Electrochemistry of porous and crystalline silicon electrodes in methylviologen solutions

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Kooij, E.S. and Despo, R.W. and Mulders, F.P.J. and Kelly, J.J. (1996) Electrochemistry of porous and crystalline silicon electrodes in methylviologen solutions. Journal of Electroanalytical Chemistry, 406 (1-2). pp. 139-146. ISSN 1572-6657

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Abstract:From measurements using stationary and rotating disc and ring-disc electrodes, it is concluded that the reduction reactions of the divalent methylviologen cation MV2+ (to MV+· and MV0) proceed via the conduction band of both porous and crystalline silicon. The product of the second reduction step (MV0) forms a blocking layer on the electrode. The oxidation reactions of MV0 and MV+· take place by electron injection into the conduction band of n-type crystalline silicon. From the current-potential characteristics it follows that MV+· is also able to inject electrons into porous silicon formed on an n-type electrode. At p-type porous silicon, electroluminescence is observed as a result of radiative recombination of holes (majority carriers) with electrons (minority carriers) injected into the porous structure during oxidation of MV+·. Introducing ethanol into the solution leads to changes in the current-potential characteristics, which are explained by the solubility of MV0 in these solutions. The current-potential characteristics are considered on the basis of the position of the band edges, as deduced from impedance measurements, and differences between crystalline and porous silicon are discussed.

Item Type:Article
Copyright:© 1996 Elsevier B.V.
Link to this item:http://purl.utwente.nl/publications/75167
Official URL:http://dx.doi.org/10.1016/0022-0728(96)04423-3
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