Walter Hermann Schottky (23 July 1886, Zürich, Switzerland – 4 March 1976, Pretzfeld, West Germany) was a German physicist who invented the screen-grid vacuum tube in 1915 and the tetrode in 1919 while working at Siemens.
In 1938, Schottky formulated a theory predicting the Schottky effect, now used in Schottky diodes.
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