Journal
OPTICS EXPRESS
Volume 18, Issue 7, Pages 7085-7091Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.007085
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- DARPA-MTO
- University of Delaware Research Foundation
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Efficient room-temperature luminescence at optical telecommunication wavelengths and originating from direct band-to-band recombination has been observed in tensile-strained germanium nanocrystals synthesized by mechanical grinding techniques. Selected area electron diffraction, micro-Raman and optical-absorption spectroscopy measurements indicate high tensile-strains while combined photoluminescence spectroscopy, excitation-power evolution and time-resolved measurements suggest direct band-to-band recombination. Such band-engineered germanium nanocrystals offer great possibilities for silicon-photonics integration due to their superb light-emission properties, facile fabrication and compatibility with standard microelectronic processes. (C) 2010 Optical Society of America
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