An analytical model of drain current of Si/SiGe heterostructure p-channel MOSFETs is presented. A simple polynomial approximation is used to model the sheet carrier concentration (pHs ) in the two-dimensional hole gas at the Si/SiGe interface. The interdependence of pH s and the hole concentration at the Si/SiO2 interface (pS
s ) is taken into account in the model, which considers current flow at both the Si/SiGe and the Si/SiO2 interfaces. This model is applicable to compressively strained SiGe
buried-channel heterostructure PMOSFETs as well as tensilestrained surface-channel PMOSFETs. The model has been implemented in SABER, a circuit simulator. The results from the model show an excellent agreement with the experimental data.