RTP annealings for high-quality LPCVD interpolysilicon dielectric layers

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Klootwijk, J.H. and Kranenburg, H. van and Weusthof, M.H.H. and Woerlee, P.H. and Wallinga, H. (1998) RTP annealings for high-quality LPCVD interpolysilicon dielectric layers. Microelectronics Reliability, 38 (2). pp. 277-280. ISSN 0026-2714

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Abstract:Deposited instead of thermally grown oxides were studied to form high-quality interpolysilicon dielectric layers for embedded non-volatile memory application. It was found that by optimizing the texture and morphology of the polysilicon layers and by optimizing the post-dielectric deposition-anneal, very high-quality dielectric layers can be obtained. In this paper it is shown that for deposited interpolysilicon oxides rapid thermal annealing leads to improved electrical characteristics, like high charge to breakdown (Qbd≈20 C/cm2), lower leakage currents and decreased charge trapping during stress, depending on the RTP anneal ambient. Three annealing ambients are compared: N2, O2 and N2O. Annealing in N2O ambient is shown to be superior to the other annealings.
Item Type:Article
Copyright:© 1998 Elsevier
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Link to this item:http://purl.utwente.nl/publications/73895
Official URL:http://dx.doi.org/10.1016/S0026-2714(97)00047-4
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