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Ultrafast carrier dynamics and the role of grain boundaries in polycrystalline silicon thin films grown by molecular beam epitaxy

Titova, Lyubov V. ; Cocker, Tyler L. ; Xu, Sijia ; Baribeau, Jean-Marc ; Wu, Xiaohua ; Lockwood, David J. ; Hegmann, Frank A.


We have used time-resolved terahertz spectroscopy to study microscopic photoconductivity and ultrafast photoexcited carrier dynamics in thin, pure, non-hydrogenated silicon films grown by molecular beam epitaxy on quartz substrates at temperatures ranging from 335 degrees C to 572 degrees C. By controlling the growth temperature, thin silicon films ranging from completely amorphous to ...


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