Polarity-controlled visible/infrared electroluminescence in Si-nanocrystal/Si light-emitting devices

Zhihong Liu; Jiandong Huang; Joshi, Pooran C.; Voutsas, Apostolos T.; Hartzell, John; Capasso, Federico; Jiming Bao
August 2010
Applied Physics Letters;8/16/2010, Vol. 97 Issue 7, p071112
Academic Journal
We report the demonstration of a room-temperature visible/infrared color-switchable light-emitting device comprising a Si nanocrystal-embedded silicon oxide thin film on a p-type Si substrate. The device emits band-edge infrared light from the silicon substrate when the substrate is positively (forward) biased with respect to the Si-nanocrystal film. Under reverse bias, visible emission from the Si-nanocrystal film is observed. Compared to the photoluminescence of the Si-nanocrystal film, the visible electroluminescence is broader and blueshifted to shorter wavelength, and is ascribed to impact ionization in the Si-nanocrystal/SiO2 film.


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