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Molecular modification of an ionic semiconductor–metal interface: ZnO/molecule/Au diodes
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18.This is discussed in detail in A. Vilan and D. Cahen (unpublished), based on results from several experiments, including controls. In short, for junctions made by LOFO with slow drying, the relevant dipole moment is the one corresponding to that of molecules, chemisorbed on the free surface. This is so because then over most of the junction area the metal and molecules are separated by an air gap. If, however, the molecules’ functional groups and the metal are directly contacting, those groups will influence the metal rather than the remainder of the molecule, thus reversing the dipole moments.
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