Si/Sige HETEROJUNCTION BIPOLAR TRANSISTORS (A REVIEW)
Öz
The research on Sı/SiGe heterojunction bipolar transisfors has led the
ultra-high-speed transıstors tha! are compatible wilh the state-of-the-art silicon
inlegraled technology. The SiGe base regions ofthese transistors are grımn selectivety
on silicon substrates. Self-aligned slructures are used to reduce the external base
resisıance aııd base colleclor parasitic capacitance. The germanium profile in Ihe base
is graded to obtain a drift ejfect to reduce the base-transil tiıne. Si/SiGe integrated
circuils for applications in optical-flber link systems and Si/SiGe microwave pover
Iransistors have been produced wilh remarkable speeds. The SiGe semıconduaor
material system, HBT slructures and fabricalion, and device performance issues are
reviewed in thispaper.
Anahtar Kelimeler
Kaynakça
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