In this paper, we demonstrate newly developed process technology to fabricate complementary metal-oxide-silicon field-effect transistors (CMOSFETs) having atomically flat gate insulator film/silicon interface on (100) orientated silicon surface. They include 1,200 C ultraclean argon ambient annealing technology for surface atomically flattening and radical oxidation technology for device isolation, flatness recovery after ion implantation, and gate insulator formation. The fabricated CMOSFET with atomically flat interface exhibit very high current drivability such as 923 and 538 mA/mm for n-channel MOSFET (nMOS) and p-channel MOSFET (pMOS) at gate length of 100 nm when combined with very low resistance source and drain contacts, four orders of magnitude lower 1= f noise characteristics when combined with damage free plasma processes, and one decade longer time dependent dielectric breakdown (TDDB) lifetime in comparison to devices with a conventional flatness. The developed technology effectively improves the performance of the silicon-based CMOS large-scale integrated circuits (LSI).

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Atomically flat silicon surface constructed with atomic terraces and steps is realized by pure argon ambience annealing at 1200 o C on (100) crystal orientation large diameter wafers with precisely controlled tilt angle. Only the radical reaction based insulator formation technology such as oxidation utilizing oxygen radicals carried out at low temperature (400 o C) can preserve the atomically flatness at the gate insulator film/silicon interface. CMOSFET having the atomically flat interface exhibit extremely lower 1/f noise and higher mobility characteristics with smaller electrical variation than those of CMOSFETs fabricated by the conventional technologies.

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