Wide Vfband Vthtunability for metal-gated mos devices with HfLaO gate dielectrics

X. P. Wang, H. Y. Yu, M. F. Li, C. X. Zhu, S. Biesemans, Albert Chin, Y. Y. Sun, Y. P. Feng, Andy Lim, Yee Chia Yeo, Wei Yip Loh, G. Q. Lo, Dim Lee Kwong

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


For the first time, we demonstrate experimentally that by using HfLaO high-K gate dielectric, the flat-band voltage (Vfb) and the threshold voltage (Vth) of metal-electrode-gated MOS devices can be tuned effectively in a wide range (wider than that from the Si-conduction band edge to the Si-valence band edge) after a 1000-°C annealing required by a conventional CMOS source/drain activation process. As prototype examples shown in this letter, TaN gate with effective work function Φm, eff~ 3.9-4.2 eV and Pt gate with Φm, eff~ 5.5 eV are re- ported. A specific model based on the interfacial dipole between the metal gate and the HfLaO is proposed to interpret the results. This provides an additionally practical guideline for choosing the appropriate gate stacks and dielectric to meet the requirements of future CMOS devices.

Original languageEnglish
Title of host publicationSelected Semiconductor Research
PublisherImperial College Press
Number of pages3
ISBN (Electronic)9781848164079
ISBN (Print)9781848164062
StatePublished - 1 Jan 2011


  • Fermi-level pinning
  • HfLaO
  • High-K (HK) dielectric
  • Interfacial dipole
  • Metal gate (MG)
  • Work function

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