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The less surface roughness scattering effects, owing to the unique operation principle, in junctionless nanowire transistors (JLT-NW) were shown by low-temperature characterization and 2D numerical simulation results. This feature could allow a better current drive under a high gate bias. In addition, the dominant scattering mechanisms in JLT-NW, with both a short (LM = 30 nm) and a long channel (LM = 10 μm), were investigated through an in-depth study of the temperature dependence of transconductance (gm) behavior and compared to conventional inversion-mode nanowire transistors. [ABSTRACT FROM AUTHOR]

The mobility degradation by the relaxed electric-field in junctionless transistor (JLT) has been studied experimentally and theoretically. JLT showed less mobility degradation compared to the inversion-mode transistor in both planar-like and nanowire structures. The unique transconductance shape and the reduced degradation of the mobility in the nanowire JLT showed that it still has bulk neutral conduction portion in its total conduction while the immunity to the mobility degradation of JLT is enhanced with planar-structure. 2-dimensional numerical simulation confirmed the reduced transverse electric-field with bulk neutral conduction in JLT as well as the deviation of transconductance degradation by the channel doping concentration and the channel top width. [ABSTRACT FROM AUTHOR]

The error rate of low-field mobility (μ0) extracted from the conventional Y-function method in junctionless transistors (JLTs) is found to be linearly proportional to the channel doping concentration (Nd) for a typical value of the first order mobility attenuation factor θ0≈0.1V-1. Therefore, for a better understanding of their physical operation with higher accuracy, a methodology for the extraction of the low-field mobility of the surface accumulation channel (μ0_acc) and the bulk neutral channel mobility (μbulk) of JLTs is proposed based on their unique operation principle. Interestingly, it is found that the different temperature dependence between μ0_acc and μbulk is also confirming that the distribution of point defects along the channel in the heavily doped Si channel of JLTs was non-uniform. [ABSTRACT FROM AUTHOR]