Fundamental experimental data on metal–semiconductor interfaces are reexamined. It is found that the previously reported abrupt transition in Schottky barrier behavior between covalent and ionic semiconductors is not that clearly defined and diffused by data scattering. Furthermore, the data show no saturation of the linear interface parameter S for S=1. Considering the correct definition of S, it follows that the true Schottky limit can only approximately be described by S and should occur for some value S?2.0–3.0 rather than for exacatly S=1 as previously claimed.
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Michael Schlüter (1978) studied this question.