Inhaltsverzeichnis
Wie funktioniert Verpolungsschutz?
Ein Verpolungsschutz verhindert bei der Gleichspannungsversorgung (Vertauschen von Minus- und Pluspol) oder Wechselspannungsversorgung (Vertauschung von Außenleiter und Neutralleiter) eines Gerätes die falsche Polarität (Verpolung) und kann dadurch mögliche Schäden minimieren.
Was kann man anstatt einer Freilaufdiode verwenden?
anstelle der Freilaufdiode ein Boucherot-Glied verwenden.
What is a Schottky barrier?
A Schottky barrier refers to a metal-semiconductor contact having a large barrier height (i.e. and low doping concentration that is less than the density of states in the conduction band or valence band. The potential barrier between the metal and the semiconductor can be identified on an energy band diagram.
What is the value of φM in Schottky Mott rule?
Φm is the metal work function, χs the semiconductor electron affinity, ω the thickness of the space-charge layer, eVs the potential barrier, and ΦB the potential barrier height. In practice, however, most metal-semiconductor interfaces do not follow the Schottky-Mott rule.
What is the thermionic emission for a high Schottky barrier?
For a very high Schottky barrier (in this case, almost as high as the band gap), the forward bias current is carried by minority carrier injection (the white arrow shows the injection of an electron hole into the semiconductor’s valence band). The thermionic emission can be formulated as following:
How does a Schottky barrier field effect transistor work?
Introducing a second semiconductor/metal interface and a gate stack overlapping both junctions, one can obtain a Schottky barrier field effect transistor (SB-FET). The gate steers the carrier injection inside the channel modulating the band bending at the interface, and thus the resistance of the Schottky barriers.