Abstract
Efficient electroluminescence (EL) is obtained at low operating voltages (<3 V) from n+-type silicon- electrochemically oxidized thin nanocrystalline porous silicon (PS)-amorphous carbon-Indium tin oxide (ITO) junctions. The effects of a few nanometer thick amorphous carbon film between PS and ITO on the EL characteristics have been investigated. The carbon film enhances the stability. The EL efficiency is improved due to a reduction of current density and an increase in EL intensity. In addition, the reproducibility from device to device is very much improved by the carbon film. The enhancement in stability should originate from the capping of PS by the carbon film and the high chemical stability of carbon and Si-C bonds, which should prevent PS oxidation. The carbon film acts as an efficient buffer layer between PS and ITO, resulting in enhanced mechanical, electrical and chemical stability of the top contact and providing high reproducibility. The thin carbon film has only positive effects on all the EL characteristics. This is a very important step towards application.
Similar content being viewed by others
References
N. Koshida and H. Koyama, Appl. Phys. Lett. 60, 347 (1992).
B. Gelloz, T. Nakagawa and N. Koshida, Mater. Res. Soc. Symp. Proc. 536, 15 (1998)
B. Gelloz and N. Koshida, J. Appl. Phys. 88(7), 4319 (4319)
L. Tsybeskov, S. P. Duttagupta and P. M. Fauchet, Sol. State Com. 95,7, 429 (1995)
B. Gelloz and N. Koshida, Electrochem. Soc. Proc. PV99-22, 27 (1999)
N. Koshida, J. Kadokura, M. Takahashi and K. Imai Mater. Res. Soc. Symp. Proc. 638, F18.3.1 (2001)
A. J. Simons, T. I. Cox, A. Loni, L. T. Canham and R. Blacker, Thin Solid Films 297, 281 (1997)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Gelloz, B., Koshida, N. Effects of Amorphous Carbon Films on the Performance of Porous Silicon Electroluminescence. MRS Online Proceedings Library 737, 49 (2002). https://doi.org/10.1557/PROC-737-F4.9
Published:
DOI: https://doi.org/10.1557/PROC-737-F4.9