US Patent 8471343 Parasitic capacitance reduction in MOSFET by airgap ild

The instant disclosure relates to MOSFET semiconductor structures exhibiting a reduced parasitic capacitance, as well as methods of making the MOSFET semiconductor structures. The MOSFET semiconductor structures of the instant disclosure comprise an air-gap interlayer dielectric material between the contacts to the source/drain and gate structures and gate stack structures. The air-gap interlayer dielectric material causes the MOSFET semiconductor structures of the instant disclosure to have a reduced parasitic capacitance.