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Title: Electronic and chemical structure of the H2O/GaN(0001) interface under ambient conditions

Abstract

We employed ambient pressure X-ray photoelectron spectroscopy to investigate the electronic and chemical properties of the H2O/GaN(0001) interface under elevated pressures and/or temperatures. A pristine GaN(0001) surface exhibited upward band bending, which was partially flattened when exposed to H2O at room temperature. However, the GaN surface work function was slightly reduced due to the adsorption of molecular H2O and its dissociation products. At elevated temperatures, a negative charge generated on the surface by a vigorous H2O/GaN interfacial chemistry induced an increase in both the surface work function and upward band bending. We tracked the dissociative adsorption of H2O onto the GaN(0001) surface by recording the core-level photoemission spectra and obtained the electronic and chemical properties at the H2O/GaN interface under operando conditions. In conclusion, our results suggest a strong correlation between the electronic and chemical properties of the material surface, and we expect that their evolutions lead to significantly different properties at the electrolyte/ electrode interface in a photoelectrochemical solar cell.

Authors:
 [1];  [2]
+ Show Author Affiliations
  1. Univ. of Notre Dame, IN (United States). Notre Dame Radiation Lab. (NDRL); Dept. of Chemistry and Biochemistry
  2. Univ. of Notre Dame, IN (United States). Notre Dame Radiation Lab. (NDRL); Dept. of Physics
Publication Date:
Research Org.:
Univ. of Notre Dame, IN (United States). Notre Dame Radiation Lab.
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1258572
Grant/Contract Number:  
FC02-04ER15533
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhang, Xueqiang, and Ptasinska, Sylwia. Electronic and chemical structure of the H2O/GaN(0001) interface under ambient conditions. United States: N. p., 2016. Web. doi:10.1038/srep24848.
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Zhang, Xueqiang, & Ptasinska, Sylwia. Electronic and chemical structure of the H2O/GaN(0001) interface under ambient conditions. United States. https://doi.org/10.1038/srep24848
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Zhang, Xueqiang, and Ptasinska, Sylwia. Mon . "Electronic and chemical structure of the H2O/GaN(0001) interface under ambient conditions". United States. https://doi.org/10.1038/srep24848. https://www.osti.gov/servlets/purl/1258572.
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@article{osti_1258572,
title = {Electronic and chemical structure of the H2O/GaN(0001) interface under ambient conditions},
author = {Zhang, Xueqiang and Ptasinska, Sylwia},
abstractNote = {We employed ambient pressure X-ray photoelectron spectroscopy to investigate the electronic and chemical properties of the H2O/GaN(0001) interface under elevated pressures and/or temperatures. A pristine GaN(0001) surface exhibited upward band bending, which was partially flattened when exposed to H2O at room temperature. However, the GaN surface work function was slightly reduced due to the adsorption of molecular H2O and its dissociation products. At elevated temperatures, a negative charge generated on the surface by a vigorous H2O/GaN interfacial chemistry induced an increase in both the surface work function and upward band bending. We tracked the dissociative adsorption of H2O onto the GaN(0001) surface by recording the core-level photoemission spectra and obtained the electronic and chemical properties at the H2O/GaN interface under operando conditions. In conclusion, our results suggest a strong correlation between the electronic and chemical properties of the material surface, and we expect that their evolutions lead to significantly different properties at the electrolyte/ electrode interface in a photoelectrochemical solar cell.},
doi = {10.1038/srep24848},
journal = {Scientific Reports},
number = ,
volume = 6,
place = {United States},
year = {Mon Apr 25 00:00:00 EDT 2016},
month = {Mon Apr 25 00:00:00 EDT 2016}
}
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