Transistor with improved tip profile and method of...

Active solid-state devices (e.g. – transistors – solid-state diode – Field effect device – With current flow along specified crystal axis

Reexamination Certificate

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C257S019000, C257S191000, C257S368000, C257S369000, C257S374000, C257S537000, C257SE21223, C257SE21232, C257SE33003, C438S150000, C438S168000, C438S197000, C438S198000, C438S231000, C438S368000, C438S733000

Reexamination Certificate

active

07821044

ABSTRACT:
Embodiments are an improved transistor structure and the method of fabricating the structure. In particular, a wet etch of an embodiment forms source and drain regions with an improved tip shape to improve the performance of the transistor by improving control of short channel effects, increasing the saturation current, improving control of the metallurgical gate length, increasing carrier mobility, and decreasing contact resistance at the interface between the source and drain and the silicide.

REFERENCES:
patent: 7195962 (2007-03-01), Cho et al.
patent: 2005/0009250 (2005-01-01), Cho et al.
patent: 2005/0285203 (2005-12-01), Fukutome et al.
patent: 2006/0138398 (2006-06-01), Shimamune et al.
patent: 29 48 120 (1980-06-01), None
patent: 1 538 650 (1979-01-01), None
patent: 2005-019984 (2005-01-01), None
patent: WO 2005/041288 (2005-05-01), None
patent: PCT/US2006/025958 (2006-06-01), None
patent: 2007005817 (2007-01-01), None
Tellier, C.R. et al., “Characterization of the Anisotropic Chemical Attack of (HHL) Silicon Plates in a TMAH 25 Weight % Solution: Micromachining and Adequacy of the Dissolution Slowness Surface”, Sensors and Actuators A, Elsevier Sequoia S.A., Lausanne, CH, vol. 105, No. 1, Jun. 15, 2003, pp. 62-75, XP004427479.
International Preliminary Report on Patentability received for PCT Application No. PCT/US2006/025958, mailed on Jan. 17, 2008, 8 pages.
Osamu, T., “pH-Controlled TMAH Etchants for Silicon Micromachining” Transducers '95, EUROSENSORS IX, Jun. 25-29, 1995, pp. 83-86.

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