Implications of fin width scaling on variability and reliability of high-k metal gate FinFETs
✍ Scribed by S. Chabukswar; D. Maji; C.R. Manoj; K.G. Anil; V. Ramgopal Rao; F. Crupi; P. Magnone; G. Giusi; C. Pace; N. Collaert
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 716 KB
- Volume
- 87
- Category
- Article
- ISSN
- 0167-9317
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✦ Synopsis
In this paper, we report a study to understand the fin width dependence on performance, variability and reliability of n-type and p-type triple-gate fin field effect transistors (FinFETs) with high-k dielectric and metal gate. Our results indicate that with decreasing fin width the well-known performance improvement in terms of sub-threshold swing and drain-induced barrier lowering are accompanied by a degradation of the variability and the reliability. As a matter of fact fin width scaling causes (i) higher hotcarrier degradation (HC) in nFinFETs owing to the higher charge carrier temperature for the same internal stress voltages; (ii) worse negative bias temperature instability (NBTI) in pFinFETs due to the increased contribution from the (1 1 0) surface; (iii) higher variability due to the non-uniform fin extension doping, as highlighted by applying a novel characterization technique.