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We report temperature (RT-150 K) and field dependent low frequency noise measurements on Ge n-FETs. Specifically, we delineate the temperature, field, and interfacial layer (GeON vs. GeO) dependence of the gate overdrive index () on corresponding changes in volume interface trap density () and mobility (). For  < 1 × 1020 cm−3 eV−1, the dominant noise mechanism, number or mobility fluctuation, depends on the change in , but for  > 1 × 1020 cm−3eV−1 near the conduction band edge, changes in as well as determine the noise mechanism. Finally, we show that the values of Ge n-FETs are significantly different from conventional Si transistors as well as Ge p-FETs at RT and 150 K due to much higher and/or μ values of the Ge n-FETs.


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