Statistical characterization of BTI-induced high-k dielectric traps in nanoscale transistors

Ta-Hui Wang*, Jung Piao Chiu, Yu Heng Liu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


Statistical behavior of BTI-induced high-k dielectric traps in nanometer MOSFETs is characterized. We measure individual trapped charge emission times and single-trapped charge-induced Vt shifts in BTI recovery. Statistical distributions of BTI trap characteristics such as trap spatial and energy distributions and trapped charge activation energy in emission are extracted. We compare the amplitudes of BTI and RTN single-charge-induced ΔVt. BTI-induced ΔVt exhibits a larger amplitude distribution tail. An explanation will be given by use of 3D atomistic numerical simulation. In addition, we find that Vt degradation in BTI stress exhibits two stages. The first stage has logarithmic stress time dependence and is believed due to the charging of preexisting high-k dielectric traps. The second stage follows power-law time dependence, which is attributed to dielectric trap creation.

Original languageEnglish
Title of host publicationBias Temperature Instability for Devices and Circuits
PublisherSpringer New York
Number of pages22
ISBN (Electronic)9781461479093
ISBN (Print)1461479088, 9781461479086
StatePublished - 1 Jul 2014

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