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This paper investigates the temperature dependence of the main electrical parameters of junctionless (JL) silicon nanowire transistors. Direct comparison is made to silicon nanowire (trigate) MOSFETs. Variation of parameters such as threshold voltage and on-off current characteristics is analyzed. The JL silicon nanowire FET has a lager variation of threshold voltage with temperature than the standard inversion- and accumulation-mode FETs. Unlike in classical devices, the drain current of JL FETs increases when temperature is increased.