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Temperature and field dependent low frequency noise characterization of Ge n-FETs
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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. GeO2) dependence of the gate overdrive index (β) on corresponding changes in volume interface trap density (Nit) and mobility (μ). For Nit < 1 × 1020 cm−3 eV−1, the dominant noise mechanism, number or mobility fluctuation, depends on the change in μ, but for Nit > 1 × 1020 cm−3eV−1 near the conduction band edge, changes in μ as well as Nit determine the noise mechanism. Finally, we show that the β 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 Nit and/or μ values of the Ge n-FETs.
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