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We show that the incorporation of interstitial C impacts the base current ideality in SiGe:C HBTs fabricated in 0.18mum SiGe BiCMOS process. SiGe:C epi layers with the same structural and processing parameters but with less interstitial C obtained by adjusting growth conditions have better base current ideality. It is observed that the interstitial C in the emitter/base depletion region, rather than...
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