New Findings from
The news correspondents obtained a quote from the research, "Upon changing the surface termination from oxygen to hydrogen, the TRMC signal rises dramatically. For an estimated quantum yield of 1 for sub-bandgap optical excitation the hole mobility of the hydrogen-terminated undoped NCD was found to be similar to 0.27 cm(2)/(V s) with a lifetime exceeding 1 mu s. Assuming a similar mobility for the oxygen-terminated undoped NCD a lifetime of similar to 100 ps was derived. Analysis of the valence band spectra obtained by XPS suggests that upon oxidation of undoped NCD the surface Fermi level shifts (toward an increased work function). This shift originates from the size and direction of the electronic dipole moment of the surface atoms, and leads to different types of band bending at the diamond/air interface in the presence of a water film. In the case of boron-doped NCD no shift of the work function is observed, which can be rationalized by pinning of the Fermi level. This is confirmed by TRMC results of boron-doped NCD, which show no dependency on the surface termination."
According to the news reporters, the research concluded: "We suggest that photoexcited electrons in boron-doped NCD occupy nonionized boron dopants, leaving relatively long-lived mobile holes in the valence band."
For more information on this research see: Contactless Photoconductance Study on Undoped and
Our news journalists report that additional information may be obtained by contacting
Keywords for this news article include: Boron,
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