Hostname: page-component-cd9895bd7-p9bg8 Total loading time: 0 Render date: 2024-12-27T01:32:15.005Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

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