The transistor was born just before Christmas 1947 when John Bardeen and Walter Brattain, two scientists working for William Shockley at Bell Telephone Laboratories in Murray Hill, N.J., observed that when electrical signals were applied to contacts on a crystal of germanium, the output power was larger than the input. Shockley was not present at that first observation. And though he fathered the discovery in the same way Einstein fathered the atom bomb, by advancing the idea and pointing the way, he felt left out of the momentous occasion.
Shockley, a very competitive and sometimes infuriating man, was determined to make his imprint on the discovery. He searched for an explanation of the effect from what was then known of the quantum physics of semiconductors. In a remarkable series of insights made over a few short weeks, he greatly extended the understanding of semiconductor materials and developed the underlying theory of another, much more robust amplifying device--a kind of sandwich made of a crystal with varying impurities added, which came to be known as the junction transistor. By 1951 Shockley's co-workers made his semiconductor sandwich and demonstrated that it behaved much as his theory had predicted.
For the next couple of decades advances in transistor technology drove the industry, as several companies jumped on the idea and set out to develop commercially viable versions of the device. New ways to create Shockley's sandwich were invented, and transistors in a vast variety of sizes and shapes flooded the market. Shockley's invention had created a new industry, one that underlies all of modern electronics, from supercomputers to talking greeting cards. Today the world produces about as many transistors as it does printed characters in all the newspapers, books, magazines and computer and electronic-copier pages combined.
William Bradford Shockley was born in London, where his father, a mining engineer, and mother, a mineral surveyor, were on a business assignment. Home-schooled in Palo Alto, Calif., before attending Palo Alto Military Academy and Hollywood High School, he found his interest in physics sparked by a neighbor who taught the subject at Stanford University. Shockley earned a bachelor's degree from Caltech, and a Ph.D. at M.I.T. for a dissertation titled "Calculations of Wave Functions for Electrons in Sodium Chloride Crystals."
At Bell Labs, Shockley recognized early on that the solution to one of the technological nightmares of the day--the cost and unreliability of the vacuum tubes used as valves to control the flow of electrons in radios and telephone-relay systems--lay in solid-state physics. Vacuum tubes were hot, bulky, fragile and short-lived. Crystals, particularly crystals that can conduct a bit of electricity, could do the job faster, more reliably and with 1 million times less power--if only someone could get them to function as electronic valves. Shockley and his team figured out how to accomplish this trick. Understanding of the significance of the invention of what came to be called the transistor (for transfer resistance) spread quite rapidly. In 1956 Shockley, Bardeen and Brattain shared a Nobel Prize in Physics--an unusual awarding of the Nobel for the invention of a useful article.