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Strained CMOS Devices With Shallow-Trench-Isolation Stress Buffer Layers

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5 Author(s)

In this brief, shallow-trench-isolation (STI) stress buffer techniques, including sidewall stress buffer and channel surface buffer layers, are developed to reduce the impact of compressive STI stress on the mobility of advanced n-type MOS (NMOS) devices. Our investigation shows that a 7% driving current gain at an NMOS device has been achieved, whereas no degradation at a p-type MOS (PMOS) device was observed. The same junction leakage at both the NMOS and PMOS devices was maintained. A stress relaxation model with simulation is thus proposed to account for the enhanced transport characteristics.

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Electron Devices, IEEE Transactions on  (Volume:55 ,  Issue: 4 )