TU Darmstadt / ULB / TUbiblio

Synchrotron Photoemission Spectroscopy Study of p-GaInP2(100) Electrodes Emersed from Aqueous HCl Solution under Cathodic Conditions

Lebedev, Mikhail V. and Calvet, Wolfram and Kaiser, Bernhard and Jaegermann, Wolfram (2017):
Synchrotron Photoemission Spectroscopy Study of p-GaInP2(100) Electrodes Emersed from Aqueous HCl Solution under Cathodic Conditions.
In: The Journal of Physical Chemistry C, 121 (16), ACS Publications, pp. 8889-8901, ISSN 1932-7447,
DOI: 10.1021/acs.jpcc.7b01343,
[Online-Edition: https://doi.org/10.1021/acs.jpcc.7b01343],
[Article]

Abstract

(Photo)electrochemical processes occurring under cathodic polarization at the p-GaInP2(100)/1 M HClaq solution interface were investigated in detail by high-resolution surface sensitive synchrotron-radiation photoemission spectroscopy. It was found that on application of the cathodic bias in the dark to the p-GaInP2(100)/1 M HClaq solution interface the electrochemical processes are started at a bias of about −1.0 V vs reversible hydrogen electrode (RHE), where cathodic current passing through the semiconductor/electrolyte interface starts to rise. Under higher cathodic bias applied in the dark, hydroxyl groups and metallic gallium are accumulated at the surface, which is accompanied by a decrease in work function of the semiconductor. Accumulation of hydroxyl groups can be related only to splitting of water molecules at the semiconductor/electrolyte interface, since the aqueous HCl solution contains no hydroxyl groups intrinsically. Accumulation of hydroxyl groups and metallic gallium is accelerated under visible light illumination, which indicates participation of photogenerated electrons in the surface electrochemical reactions. The formation of the metallic gallium without simultaneous metallic indium formation testifies that the In–P bonds of the GaInP2 compound are more stable against cathodic corrosion than the Ga–P bonds.

Item Type: Article
Erschienen: 2017
Creators: Lebedev, Mikhail V. and Calvet, Wolfram and Kaiser, Bernhard and Jaegermann, Wolfram
Title: Synchrotron Photoemission Spectroscopy Study of p-GaInP2(100) Electrodes Emersed from Aqueous HCl Solution under Cathodic Conditions
Language: English
Abstract:

(Photo)electrochemical processes occurring under cathodic polarization at the p-GaInP2(100)/1 M HClaq solution interface were investigated in detail by high-resolution surface sensitive synchrotron-radiation photoemission spectroscopy. It was found that on application of the cathodic bias in the dark to the p-GaInP2(100)/1 M HClaq solution interface the electrochemical processes are started at a bias of about −1.0 V vs reversible hydrogen electrode (RHE), where cathodic current passing through the semiconductor/electrolyte interface starts to rise. Under higher cathodic bias applied in the dark, hydroxyl groups and metallic gallium are accumulated at the surface, which is accompanied by a decrease in work function of the semiconductor. Accumulation of hydroxyl groups can be related only to splitting of water molecules at the semiconductor/electrolyte interface, since the aqueous HCl solution contains no hydroxyl groups intrinsically. Accumulation of hydroxyl groups and metallic gallium is accelerated under visible light illumination, which indicates participation of photogenerated electrons in the surface electrochemical reactions. The formation of the metallic gallium without simultaneous metallic indium formation testifies that the In–P bonds of the GaInP2 compound are more stable against cathodic corrosion than the Ga–P bonds.

Journal or Publication Title: The Journal of Physical Chemistry C
Volume: 121
Number: 16
Publisher: ACS Publications
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Surface Science
Date Deposited: 30 Sep 2017 20:03
DOI: 10.1021/acs.jpcc.7b01343
Official URL: https://doi.org/10.1021/acs.jpcc.7b01343
Funders: This work is supported by the German science foundation (DFG, JA 859/30-1) and by the Russian Foundation for Basic Research (Project No. 14-02-91342)., Furthermore, partial support by the DFG Excellency graduate school for “Energy Science and Engineering” (GSC 1070) is gratefully acknowledged by B.K. and W.J.
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)

View Item View Item