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Thermal Sensing With Lithographically Patterned Bimetallic Thin-Film Thermocouples

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7 Author(s)
Varrenti, A.R. ; Dept. of Electr. Eng. & Comput. Sci., Northwestern Univ., Evanston, IL, USA ; Zhou, Chuanle ; Klock, A.G. ; Chyung, S.H.
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A chromium-nickel thin-film thermocouple that is 50 nm thick is demonstrated on a semiconductor substrate as proof of concept for lithographically processed bimetallic on-chip temperature sensors. The Seebeck coefficient of the thin-film thermocouple is calibrated to be 10.37 μV/°C, reproducibly smaller than the bulk literature value by a factor of 3.98. The batch reproducibility of this thin-film Seebeck coefficient is demonstrated. The linear Seebeck response up to 90°C is calibrated with the help of a simple formula which accounts for the temperature variations of the reference thermocouple under large heat loads.

Published in:
Electron Device Letters, IEEE  (Volume:32 ,  Issue: 6 )

Date of Publication: June 2011

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