Characterization and modeling of low frequency noise in sub-0.1-µm SiGe pMOSFET's

Krunoslav Romanjek; Jan Andrzej Chroboczeck; Gérard Ghibaudo; Thomas Ernst

doi:10.1117/12.546495

25 May 2004 Characterization and modeling of low-frequency noise in sub-0.1-μm SiGe pMOSFETs

Krunoslav Romanjek, Jan Andrzej Chroboczeck, Gérard Ghibaudo, Thomas Ernst

Proceedings Volume 5470, Noise in Devices and Circuits II; (2004) https://doi.org/10.1117/12.546495
Event: Second International Symposium on Fluctuations and Noise, 2004, Maspalomas, Gran Canaria Island, Spain

Abstract

Drain current-gate voltage I_d(V_g) characteristics and power spectral density of drain current fluctuations were obtained on SiGe channel pMOSFETs and on their Si homologues, for drain current intensities varied from deep subthreshold to strong inversion regions. Devices with 2.2nm thick SiO₂ gates and channel lengths 50nmd(V_g) characteristics, served for calculating the power spectral density versus drain current functions. The latter required adjusting the interface trap density and a parameter α_c, accounting for the effect of the interface charge fluctuations on the hole mobility fluctuations, significant at high levels of trap filling i.e. high drain current. We found that the power spectral density in the SiGe devices was up to 10 times lower than in the Si controls at sufficiently high drain currents. The simulation, accounting for the data, required a significant lowering of α_c for the SiGe channel. That implies that the low frequency noise reduction in SiGe MOSFETs results from a weaker interaction of the SiGe holes with the interface charges. The sub-0.1μm channel devices show a similar noise lowering, in spite of the significant hole mobility degradation.

Citation Download Citation

Krunoslav Romanjek, Jan Andrzej Chroboczeck, Gérard Ghibaudo, and Thomas Ernst "Characterization and modeling of low-frequency noise in sub-0.1-μm SiGe pMOSFETs", Proc. SPIE 5470, Noise in Devices and Circuits II, (25 May 2004); https://doi.org/10.1117/12.546495

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