A BJT (Bipolar Junction Transistor) transistor has inside two similar semi conductive materials, and between them there is a third semi conductive material of different type.Impurities have been introduced by a process called “doping”.The transistor is an arrangement of semiconductor materials that share common physical boundaries.Brattain, and William Shockley(later jointly awarded a Nobel Prize) It was also independently developed nearly simultaneously by Herbert Mataré and Heinrich Welker, German physicists working at Westinghouse Laboratory in Paris. A semiconductor device that Amplifies, Oscillates, or Switches the flow of current between two terminals Invention of the Transistor American physicists John Bardeen, Walter H.
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