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Electrical Characteristics of TaOxNy for High-k MOS Gate Dielectric Applications

Published online by Cambridge University Press:  14 March 2011

Kiju Im ,
Hyungsuk Jung ,
Sanghun Jeon ,
Dooyoung Yang  and
Hyunsang Hwang
Kiju Im
Affiliation:
Department of Materials Science and Engineering, Kwangju Institute of Science and Technology, #1, Oryong-dong, Puk-gu, Kwangju, 500-712, KOREA
Hyungsuk Jung
Affiliation:
Department of Materials Science and Engineering, Kwangju Institute of Science and Technology, #1, Oryong-dong, Puk-gu, Kwangju, 500-712, KOREA
Sanghun Jeon
Affiliation:
Department of Materials Science and Engineering, Kwangju Institute of Science and Technology, #1, Oryong-dong, Puk-gu, Kwangju, 500-712, KOREA
Dooyoung Yang
Affiliation:
Jusung Engineering, #49, Neungpyeong, Opo, Kwangju-gun, Kyunggi, 464-890, KOREA
Hyunsang Hwang
Affiliation:
Department of Materials Science and Engineering, Kwangju Institute of Science and Technology, #1, Oryong-dong, Puk-gu, Kwangju, 500-712, KOREA
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Abstract

In this paper, we report a process for the preparation of high quality amorphous tantalum oxynitride (TaOxNy) via ammonia annealing of Ta2O5 followed by wet reoxidation for use in gate dielectric applications. Compared with tantalum oxide(Ta2O5), a significant improvement in the dielectric constant was obtained by the ammonia treatment followed by light reoxidation in a wet ambient. We confirmed nitrogen incorporation in the tantalum oxynitride (TaOxNy) by Auger Electron Spectroscopy. By optimizing the nitridation and reoxidation process, we obtained an equivalent oxide thickness of less than 1.6nm and a leakage current of less than 10mA/cm2 at -1.5V. Compared with NH3 nitridation, nitridation of Ta2O5 in ND3 improve charge trapping and charge-to-breakdown characteristics of tantalum oxynitride.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 611: Symposium C – Gate Stack & Silicide Issues in Silicon Processing , 2000 , C1.8.1
Copyright
Copyright © Materials Research Society 2000

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References

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