GaN based negative capacitance heterojunction field-effect transistors with &30?mV/dec subthreshold slope for steep switching operation

摘要

We demonstrated gallium nitride (GaN) based negative capacitance field-effect transistors (NCFETs) that achieve steep switching operation. Ferroelectric phase characteristics were successfully demonstrated using a 10?nm thick undoped-HfO2ferroelectric thin film fabricated through atomic layer deposition. The HfO2metal-ferroelectric-metal (MFM) capacitor was connected in series with the gate electrode of a recessed normally-off AlGaN/GaN MOS-HFET. The forward/reverse subthreshold slopes were dramatically reduced from 104/105 to 22/23?mV/dec.