Suppression of the Ag/Si surface conductivity transition temperature by organic adsorbates
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[(a) and (b)] Schematic side view and top view of ≈0.1 ML CoPc on Ag/Si; for such sub-monolayer coverages, the molecules lie flat on the surface (see Refs. 9 and 10). (c); An electron microscope image of a tyjpical monocantilever multicontact probe. the main results reported here are made using the inndermost 4 contact which have a spacing of 500 nm.
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(a) The measured conductance as a function of CoPc coverage; the two dashed vertical lines indicate coverages of 0.1 and 1 ML of flat-lying molecules. The solid (blue) datapoint indicates a 1 ML film prepared by an alternative method. The conductance curve has been explained as a combination of carrier depletion in the underlying Ag/Si surface and conduction through the molecular layer (from Ref. 9). (b) The measured conductance of 0.1 ML CoPc deposited on Ag/Si (filled round markers of various shades (colours)) as well as the clean Ag/Si surface (fine dashed line with error bars (red). In order to ensure repeatability, 6 independent preparations of CoPc/Ag/Si were made (represented by the various shaded/coloured markers). The long dashed (black) line is intended only as a guide for the eye.
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