Transfer Doping of diamond via 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ)

JP Goss, RJ Eyre and PR Briddon
Physica Status Solidi A

Hydrogen terminated diamonds exposed to atmosphere typically exhibit surface p-type conduction, thought to be due to transfer doping with holes in the surface valence band and negatively charged counter-ions in an adsorbed layer. The effect has been demonstrated with atmospheric contamination forming an aqueous layer, and by C60 molecules. In this paper we show using first-principles computational methods that organic layers made up from DDQ molecules may also be a candidate for inducing holes in the diamond surface. The effect appears independent of surface orientation and surface coverage.

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