Device and circuit performance analysis of double gate junctionless transistors at L g = 18 nm

Abstract

The design and characteristics of double-gate (DG) junctionless (JL) devices are compared with the DG inversion-mode (IM) field effect transistors (FETs) at 45 nm technology node with effective channel length of 18 nm. The comparison are performed at iso-Vth for both n- and p-type of devices. The JL device shows lower drain-induced barrier lowering, steep subthreshold slope and lower OFF state current. For the first time, the authors demonstrate a pass gate (PG) logic, inverter circuit and static random access memory (SRAM) stability analysis using JL devices, rather than a complementary metal-oxide semiconductor (CMOS) configuration. They observed that transient response of JL PG configuration is similar to that of conventional CMOS PGs. JL inverter also shows similar transient characteristics with 25% reduction in delay and 12% improvement in 6 T SRAM cell stability compared with IMFETs, which shows large potential in digital circuit applications. The simulations were performed using coupled device-circuit methodology in ATLAS technology aided computer design (TCAD) mixed-mode simulator.