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Download "Chapter II : Diodes" (PDF:895KB)
In the case of the SBD, the semiconductor consists of n-type layers, and so the metal acts as the anode of the diode. Likewise, only electrons are carriers, and the SBD becomes a unipolar element just like a MOSFET.
The energy level of silicon differs from metal (energy gap). This energy level differs depending on the metal element. ΦB is the symbol for this difference. Pt (platinum) is a metal with a large energy gap. V (vanadium) or Ti (titanium) are metals with small energy gaps. Adopting a metal with a large ΦB makes leakage current small, but makes forward voltage VF big. For metals with small ΦB, the opposite tendency are obtained.