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Surface Microscopy of Atomic and Molecular Hydrogen from Field-Evaporating Semiconductors
- Source :
- Journal of Physical Chemistry C, Journal of Physical Chemistry C, American Chemical Society, 2021, 125 (31), pp.17078-17087. ⟨10.1021/acs.jpcc.1c04778⟩, Journal of Physical Chemistry C, 2021, 125 (31), pp.17078-17087. ⟨10.1021/acs.jpcc.1c04778⟩
- Publication Year :
- 2021
- Publisher :
- HAL CCSD, 2021.
-
Abstract
- International audience; We report on the microscopic behavior of residual hydrogen on nanometric field emitters. By using homogeneous or heterostructured semiconductor specimens analyzed in a laser-assisted atom probe, it is possible to study how the relative abundances of the ionic species H+, H2+, and H3+ depend on the microscopic electric field, estimated through post-ionization statistics. In the case of Ga-containing semiconductors, the relative abundances of H+, H2+, and H3+ follow a common trend, independent of the nonmetallic component of the matrix. The dependence of the total H flux on the electric field exhibits a more complex behavior, which depends also on the spatial direction of the variation of the field (in-depth or on-surface). The analysis of multiple detection events provides further insights into surface chemistry. Noticeably, H+–H3+ ion pairs are both correlated in number and separated by very small distances on the detector space, suggesting a possible reaction 2H2 → H3++H++2e– taking place on the field emitter surface.
- Subjects :
- Surface (mathematics)
Field Emission
Materials science
Field (physics)
02 engineering and technology
01 natural sciences
0103 physical sciences
Microscopy
Field ionization
Atom Probe Tomography
Physical and Theoretical Chemistry
010306 general physics
ComputingMilieux_MISCELLANEOUS
[PHYS]Physics [physics]
business.industry
Hydrogen molecule
021001 nanoscience & nanotechnology
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
General Energy
Semiconductor
Chemical physics
[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]
0210 nano-technology
business
Surface Chemistry
Hydrogen
Subjects
Details
- Language :
- English
- ISSN :
- 19327447 and 19327455
- Database :
- OpenAIRE
- Journal :
- Journal of Physical Chemistry C, Journal of Physical Chemistry C, American Chemical Society, 2021, 125 (31), pp.17078-17087. ⟨10.1021/acs.jpcc.1c04778⟩, Journal of Physical Chemistry C, 2021, 125 (31), pp.17078-17087. ⟨10.1021/acs.jpcc.1c04778⟩
- Accession number :
- edsair.doi.dedup.....5ef304fb97f72e75143c56c7f26364e7