Room-Temperature Silicon Band-Edge Photoluminescence Enhanced by Spin-Coated Sol-Gel Films

Details Room-Temperature Silicon Band-Edge Photoluminescence Enhanced by Spin-Coated Sol-Gel Films Room-Temperature Silicon Band-Edge Photoluminescence Enhanced by Spin-Coated Sol-Gel Films

2012-02-02

arxiv.org/abs/1202.0575v1

Scripta Materialia 65, 767 (2011)

Physics

Condensed Matter

Materials Science

8 pages, 3 figures

Scientific paper

10.1016/j.scriptamat.2011.07.025

Photoluminescence is observed at room temperature from phonon-assisted band-to-band emission in Si (1.067 eV peak) using unpatterned bulk p-type silicon wafer samples that were spin-coated with Er-doped (6 at. %) silica-gel films (0.13 micron) and vacuum annealed; the strongest emission was obtained at ~700 degrees C. Comparative study of annealing behavior indicates two-orders of magnitude efficiency enhancement. Emission from Er+3 ions in the silica film is used to gauge relative emission strengths. Mechanisms for inducing emission from silicon utilizing stresses in sol-gel-films are discussed.

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