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A surface-micromachined capacitive-type micro-electro-mechanical system (MEMS) acoustic sensor with X-shape bottom electrode anchor on a Si substrate is presented. As it is designed to be implemented on only one side of a substrate for a simple monolithic integrated process, this sensor has X-shape bottom electrode anchor fabricated. The anchor operates to remove the back side process of wafer for...
An independent-gate four-terminal FinFET SRAM have been successfully fabricated for drastic leakage current reduction. The new SRAM is consisted of a four-terminal (4T-) FinFET which has a flexible Vth controllability. The 4T-FinFET with a TiN metal gate is fabricated by a newly developed gate separation etching process. By appropriately controlling the Vth of the 4T-FinFET, we have successfully demonstrated...
Polarities of plasma charging damage in n- and p-channel MOSFETs with Hf-based high-k gate stack (HfAlOx/SiO2) were studied for two different plasma sources (Ar-and Cl-based gas mixtures), and found to depend on plasma conditions, in contrast to those with conventional SiO2. For Ar-plasma, which was confirmed to induce a larger charging damage, both n- and p-ch MOSFETs with high-k gate stacks suffer...
We have observed new charge trapping phenomena in sub-80-nm DRAM recessed- channel-array-transistor (RCAT) after Fowler-Nordheim (FN) stress. Gate stack process strongly affected the charge trapping and the trap generating in oxide bulk and interface of RCAT. According to the trapped charges and/or the generated traps after FN stress, the data retention time and writing capabilities of DRAM were dramatically...
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