Improvement of the visible electroluminescence from nanocrystalline silicon embedded in CaF2 on Si(111) substrate prepared by rapid thermal annealing

被引:0
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作者
Maruyama, Takeo [1 ]
Nakamura, Naoto [1 ]
Watanabe, Masahiro [1 ]
机构
[1] Department of Information Processing, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
来源
| 1996年 / JJAP, Tokyo, Japan卷 / 39期
关键词
Calcium compounds - Electroluminescence - Ionization - Low temperature operations - Molecular beam epitaxy - Morphology - Nanostructured materials - Photoluminescence - Rapid thermal annealing - Single crystals - Substrates - Surfaces;
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摘要
Electroluminescence (EL) from nanocrystalline Si (nc-Si) embedded in a single-crystal CaF2 layer formed on a p-type Si(111) substrate has been demonstrated. Nc-Si/CaF2 layers were grown by co-evaporation of Si and CaF2 by molecular beam epitaxy for Si and partially ionized epitaxy for CaF2 at a low growth temperature, followed by rapid thermal annealing (RTA) in N2 ambient. The crystal growth and annealing conditions were optimized by investigation of the surface morphology and photoluminescence (PL) intensity. Visible EL was observed at room temperature in the dark with the naked eye, from the entire surface of the transparent electrode for current injection. The uniformity and intensity of the luminescence was drastically improved by RTA in N2 ambient.
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