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Non-parabolic Potential Dependence of Optical Second Harmonic Generation from Si(111) Electrode/Electrolyte Interface

Abstract

We performed potential dependent second harmonic generation (SHG) measurement on the Si(111) electrolyte interface at different azimuthal angles and at different polarization combinations. When the external potential was biased from equilibrium potential to the flatband potential (Efb), the SHG intensity decreased linearly with the potential when the azimuthal angle is oriented at 30o. This linearity extends well beyond the linear region of the Mott-Schottky plot as measured traditionally by the capacitance measurement. When the external potential was scanned from Efb toward more negative potentials, the response of SHG intensity showed quadratic behavior and can be described by the parabolic model. This non-parabolic potential dependence cannot be explained with the parabolic model proposed from previous literatures. Such asymmetric behavior only implied that the interfacial structure of Si(111) electrode changes from semiconductor to metal with the applied electric potential biased negatively, i.e. with accumulation of electrons in the surface region. The anisotropic contribution from Si(111) electrode can also significantly affects the SHG response as seen where the minimum from the potential dependent SHG curve shifts away from Efb.

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Publication details

The article was received on 05 Sep 2018, accepted on 09 Nov 2018 and first published on 09 Nov 2018


Article type: Paper
DOI: 10.1039/C8CP05621H
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Non-parabolic Potential Dependence of Optical Second Harmonic Generation from Si(111) Electrode/Electrolyte Interface

    H. Bian, Y. Guo and H. Wang, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP05621H

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