From Electronics I Laboratory Manual

Besides the PN diodes that we studied in the last experiment there are many more types of diodes.  Each one is used in applications that can take advantage of its behavior and characteristics.  What follows is a short statement explaining features of some of these special purpose diodes.

Zener Diode
A zener diode is similar to the PN diode, but with special fabrication techniques it can be built with a specific breakdown voltage.  The breakdown voltage of these diodes is called the Zener voltage, VZA typical PN diode normally has a very large breakdown voltage.  A zener diode, on the other hand, can have practically any value for the breakdown voltage.  You can find zener diodes with VZ ranging from a few volts to several hundred volts.  Another important feature that makes the zener diode different from the normal PN diode is that at breakdown the characteristic curve is approximately a vertical line, indicating that in breakdown the Zener diode produces nearly constant voltage.  Thus a Zener diode operating in its breakdown region will produce a constant voltage equal to VZ.  Because of this fact, the Zener diode is normally used in the reverse-bias...

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Power Amplifiers
Power amplifiers deliver a specific amount of AC power to a load. They are used in audio frequency and radio frequency applications.
Gate Turn-off (GTO) Thyristors
Gate turn-off thyristors (GTOs) are four-layer PNPN devices that act as switches, rectifiers, and voltage regulators. Like other thyristors, GTOs can be turned on by the application of a positive gate signal (g > 0); however, unlike other more conventional devices that can be turned off only at a zero crossing of current, GTOs can be turned off at any time by the application of a gate signal equal to zero.
Unijunction Transistors (UJT)
Unijunction transistors (UJT) are three-terminal devices that exhibit a negative resistance characteristic.
Diacs are bi-directional diodes that switch AC voltages and trigger silicon controlled rectifiers (SCRs) and triacs. Except for a small leakage current, diacs do not conduct until the breakover voltage is reached.

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