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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 and evolve H2 gas. 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. 4 nm 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 the surface readily dissociates H2O to form OH species, which may impact surface band bending.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [2];  [3];  [4]; ORCiD logo [1]
  1. BATTELLE (PACIFIC NW LAB)
  2. SuperSTEM Laboratory, United Kingdom
  3. University of Leeds
  4. Advanced Light Source, Lawrence Berkeley National Laboratory
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1510983
Report Number(s):
PNNL-SA-131770
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
MRS Communications
Additional Journal Information:
Journal Volume: 8; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
electrocatalysis, photoelectrochemistry, hydrogen evolution reaction, ambient pressure X-ray photoelectron spectroscopy

Citation Formats

Stoerzinger, Kelsey A., Du, Yingge, Spurgeon, Steven R., Wang, Le, Kepaptsoglou, D. M., Ramasse, Q M., Crumlin, Ethan J., and Chambers, Scott A. Chemical and Electronic Structure Analysis of a SrTiO3 (001) / p-Ge (001) Hydrogen Evolution Photocathode. United States: N. p., 2018. Web. doi:10.1557/mrc.2018.38.
Stoerzinger, Kelsey A., Du, Yingge, Spurgeon, Steven R., Wang, Le, Kepaptsoglou, D. M., Ramasse, Q M., Crumlin, Ethan J., & Chambers, Scott A. Chemical and Electronic Structure Analysis of a SrTiO3 (001) / p-Ge (001) Hydrogen Evolution Photocathode. United States. doi:10.1557/mrc.2018.38.
Stoerzinger, Kelsey A., Du, Yingge, Spurgeon, Steven R., Wang, Le, Kepaptsoglou, D. M., Ramasse, Q M., Crumlin, Ethan J., and Chambers, Scott A. Fri . "Chemical and Electronic Structure Analysis of a SrTiO3 (001) / p-Ge (001) Hydrogen Evolution Photocathode". United States. doi:10.1557/mrc.2018.38.
@article{osti_1510983,
title = {Chemical and Electronic Structure Analysis of a SrTiO3 (001) / p-Ge (001) Hydrogen Evolution Photocathode},
author = {Stoerzinger, Kelsey A. and Du, Yingge and Spurgeon, Steven R. and Wang, Le and Kepaptsoglou, D. M. and Ramasse, Q M. and Crumlin, Ethan J. and Chambers, Scott A.},
abstractNote = {Germanium is a small-gap semiconductor that efficiently absorbs visible light, resulting in photoexcited electrons predicted to be sufficiently energetic to reduce H2O and evolve H2 gas. 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. 4 nm 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 the surface readily dissociates H2O to form OH species, which may impact surface band bending.},
doi = {10.1557/mrc.2018.38},
journal = {MRS Communications},
number = 2,
volume = 8,
place = {United States},
year = {2018},
month = {6}
}

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