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On the nature of the stretched exponential photoluminescence decay for silicon nanocrystals.

Zatryb G, Podhorodecki A, Misiewicz J, Cardin J, Gourbilleau F - Nanoscale Res Lett (2011)

Bottom Line: It was found that photoluminescence decay is strongly non-single exponential and can be described by the stretched exponential function.It was also shown that effective decay rate probability density function may be recovered by means of Stehfest algorithm.Moreover, it was proposed that the observed broadening of obtained decay rate distributions reflects the disorder in the samples.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Physics, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland. artur.p.podhorodecki@pwr.wroc.pl.

ABSTRACT
The influence of hydrogen rate on optical properties of silicon nanocrystals deposited by sputtering method was studied by means of time-resolved photoluminescence spectroscopy as well as transmission and reflection measurements. It was found that photoluminescence decay is strongly non-single exponential and can be described by the stretched exponential function. It was also shown that effective decay rate probability density function may be recovered by means of Stehfest algorithm. Moreover, it was proposed that the observed broadening of obtained decay rate distributions reflects the disorder in the samples.

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Related in: MedlinePlus

Effective decay rate probability density functions. Power-like dependence may be observed for higher decay rates (a) in log-log scale. The distribution broaden significantly with the increase of rH. Shift of the distribution is visible (b) together with average decay time drop and EU rise for higher rH (inset). The normalization in (b) was carried out in a manner exposing distributions broadening while in (a) the function Φ(k) is properly normalized probability density function.
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Figure 4: Effective decay rate probability density functions. Power-like dependence may be observed for higher decay rates (a) in log-log scale. The distribution broaden significantly with the increase of rH. Shift of the distribution is visible (b) together with average decay time drop and EU rise for higher rH (inset). The normalization in (b) was carried out in a manner exposing distributions broadening while in (a) the function Φ(k) is properly normalized probability density function.

Mentions: Figures 4a,b show decay rate distribution Φ(k) calculated from Eq. 8. As expected, a power-like dependence may be observed (Figure 4a) for high values of the abscissa variable. The obtained distributions are very broad with long tails directed towards shorter lifetimes, which demonstrates the strongly non-single exponential character of decay curves. While increasing rH, the decay rate distribution Φ(k) shifts towards higher decay rates (Figure 4b). What is more, Φ(k) broaden significantly with increasing rH parameter.


On the nature of the stretched exponential photoluminescence decay for silicon nanocrystals.

Zatryb G, Podhorodecki A, Misiewicz J, Cardin J, Gourbilleau F - Nanoscale Res Lett (2011)

Effective decay rate probability density functions. Power-like dependence may be observed for higher decay rates (a) in log-log scale. The distribution broaden significantly with the increase of rH. Shift of the distribution is visible (b) together with average decay time drop and EU rise for higher rH (inset). The normalization in (b) was carried out in a manner exposing distributions broadening while in (a) the function Φ(k) is properly normalized probability density function.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211150&req=5

Figure 4: Effective decay rate probability density functions. Power-like dependence may be observed for higher decay rates (a) in log-log scale. The distribution broaden significantly with the increase of rH. Shift of the distribution is visible (b) together with average decay time drop and EU rise for higher rH (inset). The normalization in (b) was carried out in a manner exposing distributions broadening while in (a) the function Φ(k) is properly normalized probability density function.
Mentions: Figures 4a,b show decay rate distribution Φ(k) calculated from Eq. 8. As expected, a power-like dependence may be observed (Figure 4a) for high values of the abscissa variable. The obtained distributions are very broad with long tails directed towards shorter lifetimes, which demonstrates the strongly non-single exponential character of decay curves. While increasing rH, the decay rate distribution Φ(k) shifts towards higher decay rates (Figure 4b). What is more, Φ(k) broaden significantly with increasing rH parameter.

Bottom Line: It was found that photoluminescence decay is strongly non-single exponential and can be described by the stretched exponential function.It was also shown that effective decay rate probability density function may be recovered by means of Stehfest algorithm.Moreover, it was proposed that the observed broadening of obtained decay rate distributions reflects the disorder in the samples.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Physics, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland. artur.p.podhorodecki@pwr.wroc.pl.

ABSTRACT
The influence of hydrogen rate on optical properties of silicon nanocrystals deposited by sputtering method was studied by means of time-resolved photoluminescence spectroscopy as well as transmission and reflection measurements. It was found that photoluminescence decay is strongly non-single exponential and can be described by the stretched exponential function. It was also shown that effective decay rate probability density function may be recovered by means of Stehfest algorithm. Moreover, it was proposed that the observed broadening of obtained decay rate distributions reflects the disorder in the samples.

No MeSH data available.


Related in: MedlinePlus