Silicon Nanocrystals in Porous Silicon and Applications

Gelloz, Bernard

doi:10.1002/9783527629954.ch14

Cited by 5 publications

(2 citation statements)

References 254 publications

(347 reference statements)

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“…However, because of quantum confinement, relatively efficient visible light emission can be obtained from nanocrystalline silicon layers, such as porous silicon (PSi). [1][2][3] The efficiency, stability and peak wavelength of PSi photoluminescence (PL) are drastically affected not only by the size but also by the surface chemistry of the nanocrystals. Major practical limitations of PSi are (i) its low efficiency compared to organic or directbandgap semiconductors (typically 1-10%) and (ii) its poor stability (seconds to days depending on surface termination).…”

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“…Major practical limitations of PSi are (i) its low efficiency compared to organic or directbandgap semiconductors (typically 1-10%) and (ii) its poor stability (seconds to days depending on surface termination). [1][2][3] Recently, we have significantly improved both the luminescence stability and efficiency (23% ext. quantum efficiency) of PSi by growing a relaxed and good quality oxide shell around the nanocrystals using highpressure water vapor annealing.…”

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Ultraviolet and Long-Lived Blue Luminescence of Oxidized Nano-Porous Silicon and Pure Nano-Porous Glass

Gelloz

Mentek

Koshida

2014

ECS J. Solid State Sci. Technol.

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Heavily oxidized porous silicon exhibits a strong blue light emission band including a long-lived phosphorescence component, particularly strong below 200 K. Its origin is related to molecular species in the silicon/silicon oxide nanostructure. In this paper, we show that porous glass also exhibits the same phenomenon, supporting the fact the silicon phase in oxidized porous silicon is not involved in the blue emission process. In addition, a new emission band, in the ultraviolet (UV) region (270–295 nm), has been identified in both of these porous materials. It is associated to a very narrow absorption band, with a very small Stokes shift. It was not found correlated to the blue emission band. Moreover, the effect of sample exposure to liquid ethanol, resulting in the removal of carbon-related contaminants from the surface, was studied. The blue band was almost not affected, whereas the UV band was dramatically enhanced. The latter band was attributed to molecular species, present in air, adsorbed at the surface.

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confidence: 99%