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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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The non-single exponential PL decays measured for samples with different rH. The solid line stands for stretched exponential function fit (Eq. 1). β parameters and the average time constant <τ> are shown.
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Figure 3: The non-single exponential PL decays measured for samples with different rH. The solid line stands for stretched exponential function fit (Eq. 1). β parameters and the average time constant <τ> are shown.

Mentions: Figure 3 shows experimental PL decays measured at around 820 nm (PL peak, 1.5 eV). Hundreds-microseconds long, strongly non-single exponential decay profiles were obtained that can be well described by Eq. 4. The least-squares fit of the Eq. 4 to experimental data brings values of τ0 and β. Having both constants, it is possible to define average decay time constant <τ> in the following form:


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)

The non-single exponential PL decays measured for samples with different rH. The solid line stands for stretched exponential function fit (Eq. 1). β parameters and the average time constant <τ> are shown.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: The non-single exponential PL decays measured for samples with different rH. The solid line stands for stretched exponential function fit (Eq. 1). β parameters and the average time constant <τ> are shown.
Mentions: Figure 3 shows experimental PL decays measured at around 820 nm (PL peak, 1.5 eV). Hundreds-microseconds long, strongly non-single exponential decay profiles were obtained that can be well described by Eq. 4. The least-squares fit of the Eq. 4 to experimental data brings values of τ0 and β. Having both constants, it is possible to define average decay time constant <τ> in the following form:

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