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Transistors Work at Low Temp

Photonics Spectra
Jun 1998
Kevin Robinson

Engineers at Germanium Power Devices are refining a transistor that works at liquid helium temperature. The germanium field-effect transistor was pioneered by Texas Instruments but never put into extensive production. The Massachusetts company, funded by a Small Business Innovation Research grant, is optimizing the device for deep cryogenic operation. Current transistors do not operate well at extremely low temperatures, causing poor device performance.
The devices fill a need at NASA for transistors in cryogenically cooled infrared detectors, and the agency plans to use them in its missions. Other applications include x-ray astronomy and gravitational-wave detection.

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