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In this letter, mobility improvements by stress contact etch stop layer (CESL) in a strained 90-nm nMOSFET, with and without notched-gate structure, were studied in detail. Compared to the conventional vertical gate, a device with notched gate shows an extra 7% NMOS ION enhancement for the increased stress in the channel region and the less effect of the halo-implanted impurity on channel. Both simulations...
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