Flicker-noise improvement in 100-nm LgSi0.50Ge 0.50 strained quantum-well transistors using ultrathin si cap Layer

Feng Li, Se Hoon Lee, Zhao Fang, Prashant Majhi, Qiming Zhang, Sanjay K. Banerjee, Suman Datta

    Research output: Contribution to journalArticlepeer-review

    9 Scopus citations


    This letter presents a record low flicker-noise spectral density in biaxial compressively strained p-channel 100-nm LgSi0.50Ge 0.50 quantum-well FETs (QWFETs) with ultrathin Si (∼2 nm) barrier layer and 1-nm EOT hafnium silicate gate dielectric. The normalized power spectral density of Id fluctuations SId/Id 2 in Si0.50Ge0.50 QWFETs exhibits significant improvement by ten times over surface channel unstrained Si pMOSFETs at high Vg due to strong confinement of holes within the high-mobility QW and strong quantization in the ultrathin Si barrier layer enabled by low-thermal-budget device processing. The noise behavior in strained QW devices is found to evolve from being correlated mobility fluctuation dominated across most of Vg range to being Hooge mobility fluctuation dominated at very high Vg.

    Original languageEnglish (US)
    Article number5339241
    Pages (from-to)47-49
    Number of pages3
    JournalIEEE Electron Device Letters
    Issue number1
    StatePublished - Jan 2010

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Electrical and Electronic Engineering

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