Calculation of the Energy Band Diagram of a Photoelectrochemical Water Splitting Cell

A physical model is presented for the semiconductor electrode of a photoelectrochemical cell. The model accounts for the potential drop in the Helmholtz layer and thus enables description of both band edge pinning and unpinning. The model is based on the continuity equations for charge carriers and direct charge transfer from the energy bands to the electrolyte. A quantitative calculation of the position of the energy bands and the variation of the quasi-Fermi levels in the semiconductor with respect to the water reduction and oxidation potentials are presented. Calculated photocurrentvoltage curves are compared with established analytical models and experimental data. Our model calculations are suitable to enhance understanding and improve the properties of semiconductors for photoelectrochemical water splitting.


Published in:
Journal Of Physical Chemistry C, 118, 51, 29599-29607
Year:
2014
Publisher:
Washington, American Chemical Society
ISSN:
1932-7447
Laboratories:




 Record created 2015-02-20, last modified 2018-03-17

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