We demonstrate a BiCMOS process which uses only 22 mask steps to fabricate four types of SiGe:C HBTs, in combination with a triple-well, 2.5V CMOS core and a full menu of passive elements. Key process feature is a 2-mask HBT module. We show that transistors with peak fT values ranging from 3OGHz (@ 7V BV, , ) up to 130GHz (@ 2.1V BVczo) can he fabricated with this low-cost module. Among the passives are varactors, polysilicon resistors, and a 2fF/pmz MIMsapacitor. Five layers of AI are available, including 2pm and 3pm thick upper layers. SOC ability of the process is demonstrated by a 1M-SRAM yield of typically 70%.
Gate-quality ultrathin silicon dioxide films on strained-Si0.74Ge0.26 layers have been deposited by microwave plasma-enhanced chemical vapor deposition technique using tetraethylorthosilicate. Effect of nitric-oxide (NO)-plasma treatment on the electrical properties of the deposited oxides have been studied using a metal–insulator–semiconductor structure. A significant improvement in the interface trap level density (Dit) and charge trapping behavior under Fowler–Nordheim constant current stressing is observed for NO-plasma treated deposited oxide films.
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