four-layer diode

The four-layer diode is now called the Shockley diode.

Shockley never managed to make the four-layer diode a commercial success, in spite of eventually working out the technical details and entering production in the 1960s.

William Shockley simplified its design to a two-terminal "four-layer diode" (Shockley diode) and attempted its industrial production.

Moreover, he decided that the lab would research an invention of his own, the four-layer diode, rather than developing the diffused silicon transistor that he and Beckman had agreed upon.