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The influence of nitrogen implantation on the properties of silicon-on-insulator buried oxide using separation by oxygen implantation was studied. Nitrogen ions were implanted into the buried oxide layer with a high-dose of 1016 cm-2. The experimental results showed that the positive charge density of the nitrogen-implanted buried oxide was obviously increased, compared with the control sampes without nitrogen implantation. It was also found that the post-implantation annealing caused an additional increase of the positive charge density in the nitrogen implanted samples. However, annealing time displayed a small effect on the positive charge density of the nitrogen implanted buried oxide, compared with the significant increase induced by nitrogen implantation. Moreover, the capacitance-voltage results showed that the positive charge density of the unannealed sample with nitrogen implanted is approximately equal to that of the sample annealed at 1100 ℃ for 2.5 h in N2 ambient, despite an additional increase brought with annealing, and the buried oxide of the sample after 0.5 h annealing has a maximum value of positive charge density. According to the simulating results, the nitrogen implantation resulted in a heavy damage to the buried oxide, a lot of silicon and oxygen vacancies were introduced in the buried oxide during implantation. However, the Fourier transform infrared spectroscopy of the samples indicates that implantation induced defects can be basically eliminated after an annealing at 1100 ℃ for 0.5 h. The increase of the positive charge density of the nitrogen implanted buried oxide is ascribed to the accumulation of implanted nitrogen near the interface of buried oxide and silicon, which caused the break of weak Si-Si bonds and the production of positive silicon ions in the silicon-rich region of the buried oxide near the interface, and this conclusion is supported by the results of secondary ion mass spectrometry.
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Keywords:
- separation by oxygen implantation /
- buried oxide /
- nitrogen implantation /
- positive charge density
[1] Kuo J B, Lin S C 2001 Low-Voltage SOI CMOS VLSI Devices and Circuits (New York: Wiley)
[2] Kuo J B, Su K W 1998 CMOS VLSI engineering: silicon-on-insulator (SOI) (New York: Kluwer Academic Publishers)
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[7] Wang N J, Li N, Liu Z L, Zhang G Q, Yu F, Zheng Z S, Li G H 2007 Journal of Functional Materials and Devices 13 426
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[9] Yi W B, Zhang E X, Chen M, Li N, Zhang G Q, Liu Z L, Wang X 2004 Semicond. Sci. Tech. 19 571
[10] Zheng Z S, Liu Z L, Zhang G Q, Li N, Li G H, Ma H Z, Zhang E X, Zhang Z X, Wang X 2005 Semicond. Sci. Tech. 20 481
[11] Zhang E X, Sun J Y, Chen J, Zhang Z X, Wang X 2005 J. Electron. Mater. 34 L53
[12] Zhang E X, Qian C, Zhang Z X, Lin C L, Wang X, Wang Y M, Wang X H, Zhao G R, En Y F, Luo H W, Shi Q 2006 Chin. Phys. 15 792
[13] Zheng Z S, Liu Z L, Zhang G Q, Li N, Fan K, Zhang E X, Yi W B, Chen M, Wang X 2005 Acta Phys. Sin. 54 348 (in Chinese) [郑中山、刘忠立、张国强、李 宁、范 凯、张恩霞、易万兵、陈 猛、王 曦 2005 54 348]
[14] Zheng Z S, Liu Z L, Zhang G Q, Li N, Fan K, Zhang E X, Yi W B, Chen M, Wang X 2005 Chin. Phys. 14 565
[15] Nicollian E H, Brews J R 1982 MOS (Metal Oxide Semiconductor) Physics and technology (New York: Wiley)
[16] Sze S M 1981 Physics of semiconductor Devices (New York: Wiley)
[17] Nicollian E H, Goetzberger A 1965 IEEE Trans. Electron. Dev. 12 108
[18] Gupta G K, Yadav A D, Gundu Rao T K, Dubey S K 2000 Nucl. Instrum. Meth. B 168 503
[19] Deal B E, Sklar M, Grove A S, Snow E H 1967 J. Electrochem. Soc. 114 266
[20] Lelis A J, Oldham T R, Boesch H E, Jr McLean F B 1989 IEEE Trans. Nucl. Sci. 36 1808
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[1] Kuo J B, Lin S C 2001 Low-Voltage SOI CMOS VLSI Devices and Circuits (New York: Wiley)
[2] Kuo J B, Su K W 1998 CMOS VLSI engineering: silicon-on-insulator (SOI) (New York: Kluwer Academic Publishers)
[3] Wei H F, Chung J E, Annamalai N K 1996 IEEE Trans. Electron. Dev. 43 1200
[4] Schwank J R, Ferlet-Cavrois V, Shaneyfelt M R, Paillet P, Dodd P E 2003 IEEE Trans. Nucl. Sci. 50 522
[5] Ferlet-Cavrois V, Quoizola S, Musseau O, Flament O, Leray J L 1998 IEEE Trans. Nucl. Sci. 45 2458
[6] Yang H, Zhang E X, Zhang Z X 2007 Chin. J. Semi. 28 323
[7] Wang N J, Li N, Liu Z L, Zhang G Q, Yu F, Zheng Z S, Li G H 2007 Journal of Functional Materials and Devices 13 426
[8] Li N, Zhang G Q, Liu Z L, Fan K, Zhang Z S, Lin Q, Zhang Z X, Lin C L 2005 Chin. J. Semi. 26 349 (in Chinese) [李 宁、张国强、刘忠立、范 楷、郑中山、林青、张正选、林成鲁2005半导体学报 26 349]
[9] Yi W B, Zhang E X, Chen M, Li N, Zhang G Q, Liu Z L, Wang X 2004 Semicond. Sci. Tech. 19 571
[10] Zheng Z S, Liu Z L, Zhang G Q, Li N, Li G H, Ma H Z, Zhang E X, Zhang Z X, Wang X 2005 Semicond. Sci. Tech. 20 481
[11] Zhang E X, Sun J Y, Chen J, Zhang Z X, Wang X 2005 J. Electron. Mater. 34 L53
[12] Zhang E X, Qian C, Zhang Z X, Lin C L, Wang X, Wang Y M, Wang X H, Zhao G R, En Y F, Luo H W, Shi Q 2006 Chin. Phys. 15 792
[13] Zheng Z S, Liu Z L, Zhang G Q, Li N, Fan K, Zhang E X, Yi W B, Chen M, Wang X 2005 Acta Phys. Sin. 54 348 (in Chinese) [郑中山、刘忠立、张国强、李 宁、范 凯、张恩霞、易万兵、陈 猛、王 曦 2005 54 348]
[14] Zheng Z S, Liu Z L, Zhang G Q, Li N, Fan K, Zhang E X, Yi W B, Chen M, Wang X 2005 Chin. Phys. 14 565
[15] Nicollian E H, Brews J R 1982 MOS (Metal Oxide Semiconductor) Physics and technology (New York: Wiley)
[16] Sze S M 1981 Physics of semiconductor Devices (New York: Wiley)
[17] Nicollian E H, Goetzberger A 1965 IEEE Trans. Electron. Dev. 12 108
[18] Gupta G K, Yadav A D, Gundu Rao T K, Dubey S K 2000 Nucl. Instrum. Meth. B 168 503
[19] Deal B E, Sklar M, Grove A S, Snow E H 1967 J. Electrochem. Soc. 114 266
[20] Lelis A J, Oldham T R, Boesch H E, Jr McLean F B 1989 IEEE Trans. Nucl. Sci. 36 1808
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