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A Study of the Origin of Band-A Emission in Homoepitaxial Diamond Thin Films

Published online by Cambridge University Press:  10 February 2011

Daisuke Takeuchi ,
Hideyuki Watanabe ,
Sadanori Yamanaka ,
Hideyo Okushi ,
Koji Kajimura ,
Hidetaka Sawada ,
Hideki Ichinose  and
Takashi Sekiguchi
Daisuke Takeuchi
Affiliation:
Electrotechnical Laboratory,#0501 1–1–4 Umezono, Tsukuba 305–8568 Ibaragi, Japan
Hideyuki Watanabe
Affiliation:
Electrotechnical Laboratory,#0501 1–1–4 Umezono, Tsukuba 305–8568 Ibaragi, Japan
Sadanori Yamanaka
Affiliation:
Electrotechnical Laboratory,#0501 1–1–4 Umezono, Tsukuba 305–8568 Ibaragi, Japan
Hideyo Okushi
Affiliation:
Electrotechnical Laboratory,#0501 1–1–4 Umezono, Tsukuba 305–8568 Ibaragi, Japan
Koji Kajimura
Affiliation:
Electrotechnical Laboratory,#0501 1–1–4 Umezono, Tsukuba 305–8568 Ibaragi, Japan
Hidetaka Sawada
Affiliation:
Department of Material Science, The University of Tokyo 7–3–1 Hongo, Bunkyo-ku 113–8656 Tokyo, Japan
Hideki Ichinose
Affiliation:
Department of Material Science, The University of Tokyo 7–3–1 Hongo, Bunkyo-ku 113–8656 Tokyo, Japan
Takashi Sekiguchi
Affiliation:
Institute of Material Science in Tohoku University 2–1–1 Katahira, Sendai 980–8577, Miyagi, Japan
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Abstract

The band-A emission (around 2.8 eV) observed in high quality (device-grade) homoepitaxial diamond films grown by microwave-plasma chemical vapor deposition (CVD) was studied by means of scanning cathodoluminescence spectroscopy and high-resolution transmission electron microscopy. Recent progress in our study on homoepitaxial diamond films was obtained through the low CH4/H2 conditions by CVD. These showed atomically flat surfaces and the excitonic emission at room temperature, while the band-A emission (2.95 eV) decreased. Using these samples, we found that the band-A emission only appeared at unepitaxial crystallites (UC) sites, while other flat surface parts still showed the excitonic emission. High-resolution transmission electron microscopy revealed that there were grain boundaries which contained π-bonds in UC. This indicates that one of the origin of the band-A emission in diamond films is attributed to π bonds of grain boundaries.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 588: Symposium P – Optical Microstructural Characterization of Semiconductors , 1999 , 87
Copyright
Copyright © Materials Research Society 2000

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References

[1] Kiflawi, I. and Lang, A. R., Phil. Mag. 30, 219(1974).Google Scholar
[2] Pennycook, S. J., Brown, L. M. and Craven, A. J., Phil. Mag. A, 41, 589(1980).Google Scholar
[3] Yamamoto, N., Spence, J. C. H., and Fathy, D., Phil. Mag B, 49, 609(1984).Google Scholar
[4] Katsumata, S., Jpn. J. Appl. Phys., 31, 3594(1992).Google Scholar
[5] Iyer, S. B., Ananthakrishna, G., Arora, B. M., and Chandrasekhar, J., Phys. Rev. B, 55, 4093(1997).Google Scholar
[6] Takeuchi, D., Watanabe, H., Yamanaka, S., Okushi, H., and Kajimura, K., phys. stat. sol. (a), 174, 101(1999).Google Scholar
[7] Hayashi, K., Yamanaka, S., Okushi, H., and Kajimura, K., Mater. Res. Soc. Symp. Proc. 416, 217(1996).Google Scholar
[8] Kanaya, K. and Okayama, S., J. Phys. D5, 43 (1972).Google Scholar
[9] Dean, P. J., Lightowlers, E. C., and Wight, D. R., Phys. Rev., 140, A352 (1965).Google Scholar
[10] Watanabe, H., Hayashi, K., Takeuchi, D., Yamanaka, S., Sekiguchi, T., Okushi, H., and Kajimura, K., Appl. Phys. Lett. 73, 981(1998).Google Scholar
[11] Watanabe, H., Takeuchi, D., Yamanaka, S., Okushi, H., Kajimura, K. and Sekiguchi, T., Diamond Relat. Mater. 8, 1272(1999).Google Scholar
[12] “Grain Boundary Structure and Properties; edited by G. A. Chadwick and D. A. Smith, Academic press, London / New York / San Francisco”, 140 (1976).Google Scholar
[13] Ichinose, H. and Nakanose, M., Thin Solid Films, 319, 87(1998).Google Scholar