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Thin silicon dioxide and nitrided oxide using rapid thermal processing for trench capacitors

Published online by Cambridge University Press:  31 January 2011

Kenji Yoneda ,
Yoshihiro Todokoro  and
Morio Inoue
Kenji Yoneda
Affiliation:
Kyoto Research Laboratory, Matsushita Electronics Corporation, 19, Nishikujo-Kasugacho, Minami-ku, Kyoto 601, Japan
Yoshihiro Todokoro
Affiliation:
Kyoto Research Laboratory, Matsushita Electronics Corporation, 19, Nishikujo-Kasugacho, Minami-ku, Kyoto 601, Japan
Morio Inoue
Affiliation:
Kyoto Research Laboratory, Matsushita Electronics Corporation, 19, Nishikujo-Kasugacho, Minami-ku, Kyoto 601, Japan
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Abstract

Electrical characteristics of trench capacitors using RTO (Rapid Thermal Oxidation) oxides, nitroxides, and reoxidized nitroxides as the gate insulators are discussed. High temperature RTO is effective in preventing oxide thinning at the trench corner, and so the dielectric strength of trench capacitors is improved drastically. The mean time to failure (MTTF) of trench capacitors using RTO is more than ten times longer than that of trench capacitors using conventional furnaces. Using reoxidized nitroxides as the gate insulator, superior charge to breakdown (QBD) is obtained. RTP (Rapid Thermal Processing) is superior to the process using the conventional furnace for the gate insulators of trench capacitors. Improvements in temperature uniformity, repeatability, and lessening of slip line formation are essential for RTP equipment to be practical.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 11 , November 1991 , pp. 2362 - 2370
Copyright
Copyright © Materials Research Society 1991

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