Substrate contacts for a transistor
摘要:
In some embodiments, a substrate contact is formed by forming a first gate structure and a second gate structure. The first gate structure is formed in a first volume in a first area of the wafer and the second gate structure is formed in a second volume in a second area of the wafer. The gate dielectric is removed from the wafer in a first area of the wafer but remains in the second area. A first sidewall spacer formed for the gate structure and a second sidewall spacer is formed for the second gate structure. In some embodiments, the first gate structure can be utilized as a substrate contact and the second gate structure can be utilized as a gate of a transistor. In other embodiments, the first gate structure and the second gate structure can be removed and a metal gate material can be deposited in opening for forming a substrate contact and a metal gate, respectively. In some embodiments, the first gate structure (or the replacement metal gate structure) can be used as part of a body contact to bias the body of a transistor. In other embodiments, the first gate structure (or replacement metal gate structure) can be used as part of a current terminal contact for the transistor.
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