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Issue 8, 2015
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Direct observation of the energetics at a semiconductor/liquid junction by operando X-ray photoelectron spectroscopy

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Abstract

Photoelectrochemical (PEC) cells based on semiconductor/liquid interfaces provide a method of converting solar energy to electricity or fuels. Currently, the understanding of semiconductor/liquid interfaces is inferred from experiments and models. Operando ambient-pressure X-ray photoelectron spectroscopy (AP-XPS) has been used herein to directly characterize the semiconductor/liquid junction at room temperature under real-time electrochemical control. X-ray synchrotron radiation in conjunction with AP-XPS has enabled simultaneous monitoring of the solid surface, the solid/electrolyte interface, and the bulk electrolyte of a PEC cell as a function of the applied potential, U. The observed shifts in binding energy with respect to the applied potential have directly revealed ohmic and rectifying junction behavior on metallized and semiconducting samples, respectively. Additionally, the non-linear response of the core level binding energies to changes in the applied electrode potential has revealed the influence of defect-derived electronic states on the Galvani potential across the complete cell.

Graphical abstract: Direct observation of the energetics at a semiconductor/liquid junction by operando X-ray photoelectron spectroscopy

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Publication details

The article was received on 30 Mar 2015, accepted on 29 May 2015 and first published on 29 May 2015


Article type: Paper
DOI: 10.1039/C5EE01014D
Citation: Energy Environ. Sci., 2015,8, 2409-2416
  • Open access: Creative Commons BY-NC license
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    Direct observation of the energetics at a semiconductor/liquid junction by operando X-ray photoelectron spectroscopy

    M. F. Lichterman, S. Hu, M. H. Richter, E. J. Crumlin, S. Axnanda, M. Favaro, W. Drisdell, Z. Hussain, T. Mayer, B. S. Brunschwig, N. S. Lewis, Z. Liu and H. Lewerenz, Energy Environ. Sci., 2015, 8, 2409
    DOI: 10.1039/C5EE01014D

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      [Original citation] - Published by The Royal Society of Chemistry.

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