Abstract
Weblike aggregates of coalesced Si nanocrystals are produced by a laser vaporization -controlled condensation technique. SEM micrographs show particles with ~ 10 nm diameters but the Raman shift suggests the presence of particles as small as ~ 4 nm. FTIR of the freshly prepared particles shows weak peaks due to the stretching, bending and rocking vibrations of the Si-O-Si bonds indicating the presence of a surface oxidized layer SiOx (x<2). The particles show luminescence properties that are similar to those of porous Si and Si nanoparticles produced by other techniques. The nanoparticles do not luminesce unless, by exposure to air, they acquire the SiOx passivated coating. They show a short-lived blue emission characteristic of the SiO2 coating and a biexponential longer-lived red emission. The short lifetime component of the red emission, about 12 μs, does not depend on emission wavelength. The longer-lived component has a lifetime that ranges from 90 to over 130 μs (at 300 K), increasing with emission wavelength. The results are consistent with the quantum confinement mechanism as the source of the red photoluminescence.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
L.T. Canham, Appl. Phys. Lett., 57, 1046 (1990).
A.G. Cullis and L.T. Canham, Nature 353, 335 (1991).
L.E. Brus, Nature 353, 301 (1991).
H. Takagi, H. Ogawa, Y. Yamazaki, A. Ishizaki and T. Nakagiri, Appl. Phys. Lett. 256, 117 (1992).
W.L. Wilson, P.F. Szajowski and L.E. Brus, Science 262, 1242 (1993).
Y. Kanemitsu, T. Ogawa, K. Shiraishi and K. Takeda, Phys. Rev B. 48, 4883 (1993).
L.E. Bras, P.F. Szajowski, W.L. Wilson, T.D. Harris, S. Schuppler and P.H. Citrin, J. Am. Chem. Soc. 117, 2915 (1995).
M.S. El-Shall, W. Slack, W. Vann, D. Kane and D. Hanley, J. Phys. Chem. 98, 3067 (1994).
M.S. El-Shall, D. Graiver, U. Pernisz and M.I. Baraton, NanoStructured Materials 6, 297 (1995).
M.S. El-Shall, S. Li, T. Turkki, D. Graiver, U.C. Pernisz and M.I. Baraton, J. Phys. Chem. 99, 17805 (1995).
M.S. El-Shall, S. Li, D. Graiver and U.C. Pernisz in “Nanoteehnology: Molecularlv Designed Materials”, edited by G.M. Chow and K.E. Gonsalves (ACS Symposium Series 622, Washington DC, 1996), Chapter 5, PP. 79–99.
M. Nakamura; Mochizuki; K. Usami Solid State Comm. 50 (12), 1079 (1984).
S. Hayashi, S. Tanimoto and K. Yamanoto, J. Appl. Phys. 68, 5300 (1990).
T. Okada, T. Iwaki, K. Yamamoto, H. Kasahara and K. Abe, Solid State Comm. 49 (8), 809 (1984).
R. Tsu, H. Shen and M. Dutta, Appl. Phys. Lett. 60, 1112 (1992).
S.M. Prokeds in “Nanomaterials: Synthesis. Properties and Applications” edited by A.S. Edelstein and R.C. Cammarata (Institute of Physics Publishing, Bristol, 1996), pp. 349–457; S.M. Prokes, Bull. Am. Phys. Soc. 38, 157 (1993); I.H. Campbell and P.M. Fauchet, Solid State Commun. 58 (10), 739 (1986).
Y. Kanemitsu, Phys. Rev. B. 49, 16845 (1994).
H. Tamura, M. Ruckschloss, T. Wirschem, S. Veprek, Appl. Phys. Lett. 65, 1537 (1994); H. Morisaki, H. Hashimoto, F.W. **, H. Nozawa and H. Ono, J. Appl. Phys. 74, 2977 (1993).
Author information
Authors and Affiliations
Additional information
To whom inquines should be addressed.
Rights and permissions
About this article
Cite this article
Li, S., Silvers, S.J. & Samy El-Shall, M. Luminescence Properties of Silicon Nanocrystals. MRS Online Proceedings Library 452, 141–146 (1996). https://doi.org/10.1557/PROC-452-141
Published:
Issue Date:
DOI: https://doi.org/10.1557/PROC-452-141