Work function and electron affinity of the fluorine-terminated (100) diamond surface

K. J. Rietwyk, S. L. Wong, L. Cao, K. M. Odonnell, L. Ley, A. T.S. Wee, C. I. Pakes

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Abstract

The work function and electron affinity of fluorine-terminated (100) diamond surfaces prepared by exposure to dissociated XeF2 have been determined using synchrotron-based photoemission. After vacuum annealing to 350°C a clean, monofluoride terminated C(100):F surface was obtained for which an electron affinity of 2.56 eV was measured. This is the highest electron affinity reported for any diamond surface termination so far, and it exceeds the value predicted by recent density functional theory calculations by 0.43 eV. The work function of 7.24 eV measured for the same surface places the Fermi energy of 0.79 eV above the valence band maximum.

Original languageEnglish
Article number091604
JournalApplied Physics Letters
Volume102
Issue number9
DOIs
StatePublished - 4 Mar 2013
Externally publishedYes

Bibliographical note

Funding Information:
We acknowledge financial support from the Australian Research Council under DP0879827 and the Award to K.R. of an Australian Nanotechnology Network Overseas Travel Fellowship. C.P. and K.R. thank the National University of Singapore for their generous hospitality.

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