Nickel-Silicided Schottky Junction CMOS Transistors With Gate-All-Around Nanowire Channels

Abstract

We demonstrate high-performance Schottky CMOS transistors with NiSi source/drain and gate-all-around (GAA) silicon nanowire (~5 nm) channels. The transistors exhibit good <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</sub> / <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</sub> characteristics, along with fully controlled shortchannel effects revealed by low drain-induced barrier lowering (~10 mV/V) and near-ideal subthreshold swing (~60 mV/dec). Although the N-MOSFET required dopant segregation to suppress the ambipolar behavior, excellent P-MOSFET characteristics could be achieved without the use of barrier modification techniques. We attribute this to the Schottky barrier thinning in a nanosized metal-semiconductor junction and superior gate electrostatic control in a GAA nanowire architecture.