Very important information of unipolar transistor
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On December 16, 1947, the point-contact transistor was demonstrated by Walter H. Brattain and John Bardeen(Shockley 1972 & 1976), with William Shockley as an intensely interested observer. After an additional week of further experimentation and polishing of the demonstration, it was repeated for several key Bell Laboratories managers on December 23, 1947, the date that has come to be taken as the "official" date of reduction to practice. Walter H. Brattain, John Bardeen and William Shockley shared a Nobel prize for the transistor in 1956.
"The invention of the bipolar junction transistor in 1948 was the beginning of semiconductor electronics. This device and semiconductor diodes spawned a revolution electronics. Drastic reduction in size, cost, and power consumption were achieved simultaneously with greatly increased equipment complexity and capability.
"At the same time, in 1948, Shockley and Pearson tried fabricating a rudimentary FET using evaporated layers of germanium on dieletric. However, it was not until Bardeen theoried on the surface state phenomenon and Shockley published his theoretical analysis of the unipolar field-effect transistor ....."