bipolar diode
I have two diodes oriented in opposite directions at the terminal of the same polarity. Is this a BJT?
The connection is PN-N +-NP. Can be considered as a PNP bipolar junction transistor?
Without any connection to n +, the current is limited by the reverse biased pn junction. Tensions are distributed between the two pn junctions in a manner consistent with the (very low, almost negligible) in progress. You can idealize as a zero BJT base current. If a third terminal (usually the base) connected to n +, the most polarized current can go through the base (depending on the resistors attached), and barely kept injected into the PN junction in reverse in part, unless the nn +-n region is very thin – thin enough that no significant recombination in the nn +-n region. So this is like a broad-based BJT.
Physics 250 – Lecture 26 – Semiconductor Devices
