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Author: search.filters.author.Chiu, J. P.Subject: search.filters.subject.negative bias temperature instability (NBTI)

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    A Comparative Study of NBTI and RTN Amplitude Distributions in High-kappa Gate Dielectric pMOSFETs
    (2012-02-01)
    Chiu, J. P.
    ;
    Chung, Y. T.
    ;
    Wang, Tahui
    ;
    Chen, Min-Cheng
    ;
    Lu, C. Y.
    Random telegraph noise (RTN) and negative bias temperature (NBT) stress-induced threshold voltage (V-t) fluctuations in high-kappa gate dielectric and metal-gate pMOSFETs are investigated. We measured RTN amplitude distributions before and after NBT stress. RTN in poststressed devices exhibits a broader amplitude distribution than the prestress one. In addition, we trace a single trapped charge-induced Delta V-t in NBT stress and find that the average Delta V-t is significantly larger than a Delta V(t)caused by RTN. A 3-D atomistic simulation is performed to compare a single-charge-induced Delta V-t by RTN and NBTI. In our simulation, the probability distribution of a NBT trapped charge in the channel is calculated from the reaction-diffusion model. Our simulation confirms that the NBT-induced Delta V-t indeed has a larger distribution tail than RTN due to a current-path percolation effect.