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The multi-gate architecture is considered as a key enabler for further CMOS scaling. FinFETs can readily be manufactured on SOI or bulk substrates. We report for the first time an extensive benchmark of their critical electrical figures of merit. Both alternatives show better scalability than PLANAR CMOS and exhibit similar intrinsic device performance. Introducing SOI substrates and low doped fins...
Vt-mismatch, and thus SRAM scalability, is greatly improved in narrow SOI FinFETs, with respect to planar bulk, because of their undoped channel and near-ideal gate control. We show by simulations and by measurements that in FinFETs, unlike planar bulk, beta-mismatch becomes dominant, leading to radically different SRAM characteristics. By careful process tuning, we demonstrate a substantial reduction...
We report on a major advancement in full-field EUV lithography technology. A single patterning approach for contact level by EUVL (NA=0.25) was used for the fabrication of electrically functional 0.186 mum2 6T-SRAMs, with W-filled contacts. Alignment to other 193 nm immersion litho levels shows very good overlay values les20 nm. Other key features of the process are: 1) use of high-k/Metal Gate FinFETs...
While the potential of FinFETs for large-scale integration (LSI) was demonstrated before on relaxed device dimensions, in this paper we present performance data of aggressively scaled transistors, ring oscillators and SRAM cells. FinFET SRAMs are shown to have excellent VDD scalability (SNM=185 mV at 0.6 V), enabling sub-32 nm low-voltage design.
Spacer-defined fin-patterning results in double/quadruple fin density and hence is attractive for high performance 32-nm CMOS applications. For the first time 55-nm gate-length FinFET SRAMs with resist- and spacer-defined fins are electrically compared. Due to short-range process variations, SRAM bit-cells with spacer-defined fins show approximately 2.5 times higher variability in static-noise-margin...
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