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The dc performance and low-frequency (LF) noise behaviors after hot-carrier (HC)-induced stress were compared for a junctionless nanowire transistor (JNT) and an inversion-mode nanowire transistor (INT). Less dc degradation was found in the JNT than in the INT. Due to the low lateral peak electric field (E-field) and electrons traveling through the center of the nanowire, the LF noise increment after HC-induced stress in the JNT is much lower than that in the INT. Furthermore, due to the higher lateral peak E-field located under the gate and the conduction path that occurs near the surface, the LF noise of the INT is very sensitive to HC stress.