Discussion
Which is used for the inter-connection ?
Answer: C
Interconnections are made of aluminium.
In integrated circuits, aluminium has long been the standard metal for interconnections and contact pads: it has low resistivity, adheres well to silicon dioxide, forms good ohmic contacts with silicon and is easy to deposit and etch. Copper replaced it in the most advanced processes, but aluminium is the classic answer.
Boron is a p-type dopant, oxygen is used to grow silicon dioxide, and silicon is the substrate itself. None of them is an interconnection material.
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