Surface transfer doping of hydrogen-terminated diamond by C 60F 48: Energy level scheme and doping efficiency

M. T. Edmonds, M. Wanke, A. Tadich, H. M. Vulling, K. J. Rietwyk, P. L. Sharp, C. B. Stark, Y. Smets, A. Schenk, Q. H. Wu, L. Ley, C. I. Pakes

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Surface sensitive C1s core level photoelectron spectroscopy was used to examine the electronic properties of C 60F 48 molecules on the C(100):H surface. An upward band bending of 0.74 eV in response to surface transfer doping by fluorofullerene molecules is measured. Two distinct molecular charge states of C 60F 48 are identified and their relative concentration determined as a function of coverage. One corresponds to ionized molecules that participate in surface charge transfer and the other to neutral molecules that do not. The position of the lowest unoccupied molecular orbital of neutral C 60F 48 which is the relevant acceptor level for transfer doping lies initially 0.6 eV below the valence band maximum and shifts upwards in the course of transfer doping by up to 0.43 eV due to a doping induced surface dipole. This upward shift in conjunction with the band bending determines the occupation of the acceptor level and limits the ultimately achievable hole concentration with C 60F 48 as a surface acceptor to values close to 10 13 cm -2 as reported in the literature.

Original languageEnglish
Article number124701
JournalJournal of Chemical Physics
Issue number12
StatePublished - 28 Mar 2012
Externally publishedYes

Bibliographical note

Funding Information:
We acknowledge financial support from the Australian Research Council DP0879827. Measurements were performed at the Soft X-ray Beamline of the Australian Synchrotron.


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