Browsing by Author "Lu, D. D."

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Fabrication of Omega-gated Negative Capacitance FinFETs and SRAM
(2019-01-01)
Sung, P-J
;
Su, C-J
;
Lu, D. D.
;
Luo, S-X
;
Kao, K-H
Omega-gated negative capacitance (NC) FinFETs, CMOS inverters and SRAM are fabricated and analyzed. Forming gas annealing (FGA) is performed and found to not only enhance ferroelectricity (FE) but also the NCFET electrostatics, in terms of higher I-ON, smaller hysteresis and subthreshold slop (SS). The SS is less than 60 mV/dec for both N-FinFET and P-FinFET in this work. Moreover, the CMOS inverter shows more symmetric and larger voltage gain after FGA.
First Demonstration of CMOS Inverter and 6T-SRAM Based on GAA CFETs Structure for 3D-IC Applications
(2019-01-01)
Chang, S. -W.
;
Sung, P. -J.
;
Chu, T-Y.
;
Lu, D. D.
;
Wang, C. -J.
For the first time, CMOS inverters and 6T-SRAM cells based on vertically stacked gate-all-around complementary FETs (CFETs) are experimentally demonstrated. Manufacturing difficulties of vertically stacked source and drain electrodes of the CFETs have been overcome by using junctionless transistors, thereby reducing the number of lithographic steps required. Furthermore, with post metallization treatments, both the voltage transfer characteristics (VTCs) of CMOS inverters and butterfly curves of SRAM show significant improvements due to the symmetry of nMOS and pMOS threshold voltages. Simulation shows that 3-dimensional CFET inverters have lower input parasitic capacitance than standard 2-dimensional CMOS, leading to reduced gate delay and lower power consumption.