ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
One of the most amazing features of diamond is the p-type surface conductivity whichoccurs when intrinsic material is hydrogen terminated and brought into contact with appropriatelychosen adsorbates. Experiments during the last decade have revealed the different roles of thesurface acceptors and of the covalent carbon-hydrogen surface bonds: providing unoccupiedelectronic states, and lowering the energy barrier for electron transfer from the diamond,respectively. The simplest and historically first method to supply surface acceptors, i.e. exposinghydrogenated diamond to air, provides, unfortunately, the most complex electronic system acting assurface acceptors, namely solvated ions within atmospheric wetting layers. In that case electrontransfer is accompanied by a red-ox reaction that finally induces the hole accumulation.A much simpler case of transfer doping has been demonstrated for C60F48 as molecular surfaceaccpeptors. In this case, the doping yield as a function of surface coverage can be modelledquantitatively by the transfer doping mechanism. Also, pure C60 can be adopted for transfer doping,but the formation of the van-der-Waals solid is required in this case to circumvent the electroncorrelation energy for charge transfer to a single fullere cage. The C60 layers can be stabilized byoxygen-mediated polymerisation without loosing their doping efficiency
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.48.93.pdf
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