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The Story of Semiconductors$
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John W. Orton

Print publication date: 2008

Print ISBN-13: 9780199559107

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780199559107.001.0001

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The cat’s whiskers

The cat’s whiskers

Chapter:
(p.19) Chapter 2 The cat’s whiskers
Source:
The Story of Semiconductors
Author(s):

John Orton

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199559107.003.0002

This chapter covers the history of semiconductors to the end of the Second World War, together with their first practical applications as wireless detectors, rectifiers, and microwave radar detectors. It traces the history of semiconductor physics as it developed between the wars, emphasising the importance of the Hall effect as a technique for characterising semiconductor behaviour. Many different materials showed semiconducting properties but poor control of purity made interpretation difficult. The development of the thermionic valve made cat's whisker detectors redundant in wireless sets but the cat's whisker made a comeback as a radar detector in 1940. The associated development of silicon and germanium led to an appreciation of the vital requirement for pure material and finally allowed a clear distinction to be made experimentally between extrinsic and intrinsic conduction. A final section discusses the nature of scientific research in the context of radio.

Keywords:   cat's whisker, wireless, radar, silicon, germanium, purity, Hall effect

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