Evaluation of interface property and DC characteristics enhancement in nanoscale n-channel metal-oxide-semiconductor field-effect transistor using stress memorization technique

In this letter, the advanced 40 nm technology n-channel metal-oxide-semiconductor field-effect transistor devices using the stress memorization technique (SMT) are presented. We demonstrate that SMT process would not affect the electrical characteristics of devices and can introduce higher tensile stress on channels, which enhances drive current. Through charge pumping measurement, it can be verified that SMT does not affect Si/SiO _a2 interface quality. Moreover, SMT-induced higher tensile stress decreases not only scattering coefficient but also tunneling attenuation length, resulting in smaller input-referred noise, which represents an intrinsic advantage of low-frequency noise performance.