four-layer diode

four-layer diode

[¦fȯr ¦lā·ər ′dī‚ōd]
(electronics)
A semiconductor diode having three junctions, terminal connections being made to the two outer layers that form the junctions; a Shockley diode is an example.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.