Growth and enhanced emission of silicon-germanium hemisphere shell arrays

Huang, Zhipeng; Zhu, Jing
July 2007
Applied Physics Letters;7/2/2007, Vol. 91 Issue 1, p013108
Academic Journal
Silicon-germanium (SiGe) alloy nanocrystals have been fabricated and assembled into hemisphere shell arrays by a method combining pulsed laser deposition and nanosphere lithography. Monolayer and double layer hemisphere shell arrays are fabricated. The hemisphere shell arrays remarkably enhance the photoluminescence intensity of SiGe, compared to that from unpatterned sample. The enhancement, as high as approximately 700 times, is obtained in double layer hemisphere shell arrays. Characterization of samples by scanning electron microscope and transmission electron microscope reveals that the enhancement and difference in photoluminescence spectra are mainly due to the unique optical structure of hemisphere shell arrays.


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