Low-Frequency Noise Assessment Of Ferro-Electric Field-Effect Transistors With Si-Doped Hfo2 Gate Dielectric

The low-frequency noise of planar transistors with ferroelectric Si-doped HfO2 as a gate dielectric is investigated and compared with that of undoped HfO2 reference devices. Predominantly 1/f-like spectra have been observed, which are governed by carrier number fluctuations or trapping in the gate stack. The corresponding noise power spectral density is about a factor of three higher for the reference devices, indicating that Si-doping reduces in a way similar to the trap density in the HfO2 layer.