Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 16, Pages 3472-3475Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.3472
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Hydrogen-terminated diamond exhibits a high surface conductivity (SC) that is commonly attributed to the direct action of hydrogen-related accepters. We give experimental evidence that hydrogen is only a necessary requirement for SC; exposure to air is also essential. We propose a mechanism in which a redox reaction in an adsorbed water layer provides the electron sink for the subsurface hole accumulation layer. The model explains the experimental findings including the fact that hydrogenated diamond is unique among all semiconductors in this respect.
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