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논문 상세정보

A 15 nm Ultra-thin Body SOI CMOS Device with Double Raised Source/Drain for 90 nm Analog Applications

ETRI journal v.26 no.6 , 2004년, pp.575 - 582  
Abstract

Fully-depleted silicon-on-insulator (FD-SOI) devices with a 15 nm SOI layer thickness and 60 nm gate lengths for analog applications have been investigated. The Si selective epitaxial growth (SEG) process was well optimized. Both the single- raised (SR) and double-raised (DR) source/drain (S/D) processes have been studied to reduce parasitic series resistance and improve device performance. For the DR S/D process, the saturation currents of both NMOS and PMOS are improved by 8 and 18%, respectively, compared with the SR S/D process. The self-heating effect is evaluated for both body contact and body floating SOI devices. The body contact transistor shows a reduced self-heating ratio, compared with the body floating transistor. The static noise margin of an SOI device with a $1.1\;{\mu}m^2$ 6T-SRAM cell is 190 mV, and the ring oscillator speed is improved by 25 % compared with bulk devices. The DR S/D process shows a higher open loop voltage gain than the SR S/D process. A 15 nm ultra-thin body (UTB) SOI device with a DR S/D process shows the same level of noise characteristics at both the body contact and body floating transistors. Also, we observed that noise characteristics of a 15 nm UTB SOI device are comparable to those of bulk Si devices.

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