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We propose the concept of the electrical junction in a junctionless (JL) field-effect-transistor (FET) to illustrate the transfer characteristics of the JL FET. In this work, nanowire (NW) junctionless poly-Si thin-film transistors are used to demonstrate this conception of the electrical junction. Though the dopant and the dosage of the source, of the drain, and of the channel are exactly the same in the JL FET, the transfer characteristics of the JL FET is similar to these of the conventional inversion-mode FET rather than these of a resistor, which is because of the electrical junction at the boundary of the gate and the drain in the JL FET. The electrical junction helps us to understand the JL FET, and also to explain the superior transfer characteristic of the JL FET with the gated raised S/D (Gout structure) which reveals low drain-induced-barrier-lowering (DIBL) and low breakdown voltage of ion impact ionization.

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