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

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep24848· OSTI ID:1258572
 [1];  [2]
  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

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.

Research Organization:
Univ. of Notre Dame, IN (United States). Notre Dame Radiation Lab.
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FC02-04ER15533
OSTI ID:
1258572
Journal Information:
Scientific Reports, Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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Cited By (5)

Photocatalytic CO 2 reduction by H 2 O: insights from modeling electronically relaxed mechanisms journal January 2019
Atomic-Scale Origin of Long-Term Stability and High Performance of p -GaN Nanowire Arrays for Photocatalytic Overall Pure Water Splitting journal July 2016
Effect of surface passivation process for AlGaN/GaN HEMT heterostructures using phenol functionalized-porphyrin based organic molecules journal November 2018
The Influence of Ga–OH Bond at Initial GaN Surface on the Electrical Characteristics of SiO 2 /GaN Interface journal October 2019
Significant improvement in the electrical characteristics of Schottky barrier diodes on molecularly modified Gallium Nitride surfaces journal April 2018

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