History of BJTs The First Junction Transistor First transistor with diffused pn junctions by William Shockley Bell Laboratories, Murray Hilf, New Jersey (1949) Emitter Collector Base Single-crystal Ge Emitter Collector p-type p-type Base(n-type) OE F Schubert, Rensselaer Polytechnic Institute, 2003© E. F. Schubert, Rensselaer Polytechnic Institute, 2003 12 History of BJTs