Mingyuan Gu

In this work, a novel structure of FDSOI Negative Capacitance FET (NCFET) with Stepped Thickness Ferroelectric Layer (STFL) is proposed. The STFL forms an ununiform electrostatic potential distribution on the gate oxide, which modulates the electric characteristics of NCFET. The capacitances, transfer characteristics, output characteristics, and Sub-threshold Swing (SS) are investigated. The SS of STFL FDSOI NCFET can be reduced to 49mV/dec, shows a better performance when compared to the conventional FDSOI NCFET with equal ferroelectric layer.

The influence of yttrium on the microstructure and corrosion behaviour of as-cast Mg–8Li–3Al–2Zn–xY alloys was investigated. The results show that Y addition leads to the formation of Al₂Y particles and the transformation of α-Mg from the long needle-like to the round-like. The noble Al₂Y particles on the grain boundary inhibit the galvanic corrosion between β-Li phase and α-Mg phase, and also weaken the corrosion occurrence inside β-Li phase due to the decrease of the AlLi phase. With Y addition, the corrosion resistance is improved gradually, especially when the content of Y is up to 1.5 wt-%. Moreover, Y addition makes the corrosion film become more compact, which can prevent the base materials from being attacked continuously.