Diffused junction transistor

A diffused junction transistor is a transistor formed by diffusing dopants into a semiconductor substrate. The diffusion process was developed later than the alloy-junction and grown junction processes for making bipolar junction transistors (BJTs).

Bell Labs developed the first prototype diffused junction bipolar transistors in 1954.[1]

  1. ^ Bell Labs Prototype Diffused Base Triode, Transistor Museum, Historic Transistor Photo Gallery.