In the Ebers-Moll model of transistors, these devices are connected in parallel to ideal current sources attached to the base, emitter, and collector nodes. The current through one of these devices is proportional to [read slowly] the exponential of the voltage across these devices over the thermal voltage all minus one according to the (*) Shockley equation. A metal-semiconductor interface acts as one of these devices named for Walter Schottky. (10[1])When an AC current runs through one of these devices, they act as half-wave rectifiers. In circuit diagrams, these devices are represented as a triangle with a line segment through its tip. For 10 points, name these devices that only allow current to flow in one direction, which come in Zener and light-emitting types. ■END■