|Russell Shoemaker Ohl|
January 30, 1898|
"Allentown, Pennsylvania, United States
|Died||March 20, 1987
"Vista, California, United States
"Pennsylvania State University
Russell Shoemaker Ohl (January 30, 1898 – March 20, 1987) was an American engineer who is generally recognized for "patenting the modern "solar cell (US Patent 2402662, "Light sensitive device"). Ohl was a notable "semiconductor researcher prior to the invention of the "transistor. He was also known as R.S. Ohl.
Russell Ohl’s specialized area of research was into the behavior of certain types of "crystals. He worked on materials research in the 1930s at "AT&T's "Bell Labs’ Holmdel facility, investigating diode detectors suitable for "high-frequency "wireless, "broadcasting, and "military "radar. His work was only understood by a handful of scientists in the organization, one of whom was Dr. "Walter Brattain (one of the trio who invented the germanium bipolar transistor in 1947, and who would be awarded the "Nobel Prize for Physics in 1956).
Ohl, in 1939, discovered the PN barrier (or as it became known, the “"P–N junction”). At the time hardly anyone knew anything about the impurities within these crystals, but Russell Ohl discovered the mechanism by which it worked. It was the impurities which made some sections more "resistant to "electrical flow than others, and thus it was the "barrier" between these areas of different purity that made the crystal work. Ohl later found that super-purifying "germanium was the key to making repeatable and usable semiconductor material for "diodes. All diodes (incl. LEDs, laser diodes etc.) are descendants of Ohl's work. His work with diodes led him later to develop the first silicon solar cells.