Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 26, Issue 5, Pages 679-686Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201503575
Keywords
interface energetics; photoelectrochemistry; photon management; protection layer; solar fuels
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Funding
- Biosolar Cells Program [FOM 18]
- Dutch Ministry of Economic Affairs
- VICI Grant by STW, the applied science division of the Netherlands Organization for Scientific Research (NWO)
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The solar energy conversion efficiency of photoelectrochemical (PEC) devices is usually limited by poor interface energetics, limiting the onset potential, and light reflection losses. Here, a three-pronged approach to obtain excellent performance of an InP-based photoelectrode for water reduction is presented. First, a buried p-n(+) junction is fabricated, which shifts the valence band edge favorably with respect to the hydrogen redox potential. Photoelectron spectroscopy substantiates that the shift of the surface photovoltage is mainly determined by the buried junction. Second, a periodic array of InP nanopillars is created at the surface of the photoelectrode to substantially reduce the optical reflection losses. This device displays an unprecedented photocathodic power-saved efficiency of 15.8% for single junction water reduction. Third, a thin TiO2 protection layer significantly increases the stability of the InP-based photoelectrode. Careful design of the interface energetics based on surface photovoltage spectroscopy allows obtaining a PEC cell with stable record performance in water reduction.
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