CaltechAUTHORS
Published May 15, 2015 | Version Published
Journal Article Open

Investigation of the Si/TiO_2/Electrolyte Interface Using Operando Tender X-ray Photoelectron Spectroscopy

Creators

  • 1. ROR icon California Institute of Technology
  • 2. ROR icon Joint Center for Artificial Photosynthesis
  • 3. ROR icon Lawrence Berkeley National Laboratory
  • 4. ROR icon TU Darmstadt

Abstract

Semiconductor-electrolyte interfaces allow for the creation of photoactive semiconductor systems that have band bending and other characteristics analogous to semiconductor-metal junctions (Schottky junctions). We demonstrate herein that XPS measurements can be obtained on a full three-electrode electrochemical system under potentiostatic control by use of tender X-rays to provide photoelectrons with sufficient kinetic energy to penetrate through a thin electrolyte overlayer on a portion of the working electrode. The response of the photoelectron binding energies to variations in applied voltage demonstrates that the XPS investigation works in an operando manner to elucidate the energetics of such interfaces.

Additional Information

© 2015 ECS - The Electrochemical Society. This work was supported through the Office of Science of the U.S. Department of Energy (DOE) under award no. DE-SC0004993 to the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub. The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. We thank Dr. Philip Ross for contributions to the conceptual development of the AP-XPS end-station and experimental design.

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Published - ECS_Trans.-2015-Lichterman-97-103.pdf

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Additional details

Identifiers

Eprint ID
72185
Resolver ID
CaltechAUTHORS:20161121-082816017

Funding

Department of Energy (DOE)
DE-SC0004993
Department of Energy (DOE)
DE-AC02-05CH11231

Dates

Created
2016-11-21
Created from EPrint's datestamp field
Updated
2021-11-11
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Caltech Custom Metadata

Caltech groups
JCAP , Kavli Nanoscience Institute