Chemical and electronic structure analysis of a SrTiO3 (001)/p-Ge (001) hydrogen evolution photocathode

Kelsey A. Stoerzinger; Yingge Du; Steven R. Spurgeon; Le Wang; Demie Kepaptsoglou; Quentin M Ramasse; Ethan J. Crumlin; Scott A. Chambers

doi:10.1557/mrc.2018.38

Chemical and electronic structure analysis of a SrTiO3 (001)/p-Ge (001) hydrogen evolution photocathode

Kelsey A. Stoerzinger, Yingge Du, Steven R. Spurgeon, Le Wang, Demie Kepaptsoglou, Quentin M Ramasse, Ethan J. Crumlin, Scott A. Chambers

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Germanium is a small-gap semiconductor that efficiently absorbs visible light, resulting in photoexcited electrons predicted to be sufficiently energetic to reduce H2O for H2 gas evolution. In order to protect the surface from corrosion and prevent surface charge recombination in contact with aqueous pH 7 electrolyte, we grew epitaxial SrTiO3 layers of different thicknesses on p-Ge (001) surfaces. Four-nanometer SrTiO3 allows photogenerated electrons to reach the surface and evolve H2 gas, while 13 nm SrTiO3 blocks these electrons. Ambient pressure x-ray photoelectron spectroscopy indicates that the surface readily dissociates H2O to form OH species, which may impact surface band bending.

Original language	English
Number of pages	7
Journal	Iet communications
DOIs	https://doi.org/10.1557/mrc.2018.38
Publication status	Published - 19 Mar 2018

Bibliographical note

© Materials Research Society 2018. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

Access to Document

10.1557/mrc.2018.38

01-04-18 STO-Ge-MRScom-v2 Spurgeon
© Materials Research Society 2018. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details
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https://www.cambridge.org/core/article/chemical-and-electronic-structure-analysis-of-a-srtio3-001pge-001-hydrogen-evolution-photocathode/25A09C3887570DB2CF2A36A98E2CEAB1

Cite this

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title = "Chemical and electronic structure analysis of a SrTiO3 (001)/p-Ge (001) hydrogen evolution photocathode",

abstract = "Germanium is a small-gap semiconductor that efficiently absorbs visible light, resulting in photoexcited electrons predicted to be sufficiently energetic to reduce H2O for H2 gas evolution. In order to protect the surface from corrosion and prevent surface charge recombination in contact with aqueous pH 7 electrolyte, we grew epitaxial SrTiO3 layers of different thicknesses on p-Ge (001) surfaces. Four-nanometer SrTiO3 allows photogenerated electrons to reach the surface and evolve H2 gas, while 13 nm SrTiO3 blocks these electrons. Ambient pressure x-ray photoelectron spectroscopy indicates that the surface readily dissociates H2O to form OH species, which may impact surface band bending.",

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AU - Stoerzinger, Kelsey A.

AU - Du, Yingge

AU - Spurgeon, Steven R.

AU - Wang, Le

AU - Kepaptsoglou, Demie

AU - Ramasse, Quentin M

AU - Crumlin, Ethan J.

AU - Chambers, Scott A.

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AB - Germanium is a small-gap semiconductor that efficiently absorbs visible light, resulting in photoexcited electrons predicted to be sufficiently energetic to reduce H2O for H2 gas evolution. In order to protect the surface from corrosion and prevent surface charge recombination in contact with aqueous pH 7 electrolyte, we grew epitaxial SrTiO3 layers of different thicknesses on p-Ge (001) surfaces. Four-nanometer SrTiO3 allows photogenerated electrons to reach the surface and evolve H2 gas, while 13 nm SrTiO3 blocks these electrons. Ambient pressure x-ray photoelectron spectroscopy indicates that the surface readily dissociates H2O to form OH species, which may impact surface band bending.

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