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Feasibility of 4H-SiC p-i-n diode for sensitive temperature measurements between 20.5 K and 802 K

: Matthus, C.D.; Benedetto, L. di; Kocher, M.; Bauer, A.J.; Licciardo, G.D.; Rubino, A.; Erlbacher, T.


IEEE Sensors Journal (2019), Online First, 1 S.
ISSN: 1530-437X
ISSN: 1558-1748
Fraunhofer IISB ()
temperature sensor; temperature measurement; sensor phenomena and characterization; temperature distribution; voltage measurement; 4H-silicon carbide device; semiconductor device modelling; semiconductor p-i-n diodes; temperature sensor; cryogenic temperature; high temperature

For the first time, we report on the performances of 4H-SiC pin-diode temperature sensors for operating temperatures between 20.5 K and 802 K. In this huge temperature range three ranges of performance were identified with the limit temperatures at 78.2 K and 176.3 K. In each of these ranges a different dominant current transport mechanism is shown and in the manuscript a detailed analysis and discussion is reported. The sensor performances were extracted from VD-T characteristics at different fixed ID values. In particular, at ID= 1 μ A and in the temperature range between 78.2 K and 802 K, we found a sensor sensitivity of 2.3 mV/K up to 3.4 mV/K with arms temperature error, eT, of less than 4.2 K and the sensor shows an excellent linearity quantified by the coefficient of determination R2higher than 0.9993. For even lower temperatures (below 78.2 K),low measurement currents like 10 nA are required leading to a sensitivity of 5.8 mV/K, but a lower linearity(R2=0.9095) and arms temperature error of 9.7 K which makes the sensor only partially usable in the temperature range between 20.5 K and 78.2 K. Finally, the sensor performances are compared to other state-of-the-art solutions.