The effects of interfacial layer quality on the low-frequency noise behavior of p-channel MOSFETs with high-κ gate dielectric and metal gate are investigated. Devices with chemically grown SiO2 interfacial layers (0.8 nm) are compared with N2O (0.8 nm) interfacial oxides. A 0.4 nm SiO2 interfacial layer device is used for comparison purposes. A cross-over kind of behavior has been observed in N2O devices, which occur at lower gate voltages (∼1.2-1.3 V) when normalized spectral densities and input referred noise are investigated. This behavior is found to be closely related to the observed transconductance variation in these devices. The dominant mechanism of 1/f noise is found to be Hooge's mobility fluctuations. Hooge's parameter, as a figure of merit, shows an increase for 0.4 nm devices when compared to 0.8 nm devices, while 0.8 nm N2O devices confirm their cross-over nature.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Safety, Risk, Reliability and Quality
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Electrical and Electronic Engineering