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Experimental data on metal-semiconductor interfaces are reexamined. It is found that the previously reported abrupt transition between covalent and ionic semiconductors is not that clearly defined and the outcome is diffused by data scattering. Furthermore, the data indicate no saturation of the interface parameter S for S=1. Considering the definition of S, it follows that the true Schottky limit should occur for some number S2. 0-3. 0 rather than for exactly S=1 as previously claimed.
Michael Schlüter (Thu,) studied this question.