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

doi:10.1038/srep24848

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

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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:

Zhang, Xueqiang ^[1]; Ptasinska, Sylwia ^[2]

Univ. of Notre Dame, IN (United States). Notre Dame Radiation Lab. (NDRL); Dept. of Chemistry and Biochemistry
Univ. of Notre Dame, IN (United States). Notre Dame Radiation Lab. (NDRL); Dept. of Physics

Publication Date:: 2016-04-25

Research Org.:: Univ. of Notre Dame, IN (United States). Notre Dame Radiation Lab.

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

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.  doi: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.  doi: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         = {2016},

  month        = {4}

}

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DOI: 10.1038/srep24848

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

Abstract

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