Synthesis of blue-light-emitting Si1-xGex oxide nanowires

He, J. H.; Wu, W. W.; Lee, S. W.; Chen, L. J.; Chueh, Y. L.; Chou, L. J.
June 2005
Applied Physics Letters;6/27/2005, Vol. 86 Issue 26, p263109
Academic Journal
Blue-light-emitting Si1-xGex oxide nanowires have been grown on epitaxial Si0.8Ge0.2 alloys on silicon by thermal annealing in a quartz tube furnace in N2 ambient. The photoluminescence spectrum of Si1-xGex oxide nanostructures exhibits the blue-light emission with a peak at 415 nm, compared with the Si oxide nanowires with a peak at 470 nm. Nanowires with uncommon shapes, such as sunflowerlike and radiolarialike shape, have been observed. A field emission scanning electron microscope was used to monitor the growth of nanowires on the same patterned catalytic Au region. The growth can be understood in term of vapor-liquid-solid mechanism.


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