Initial charge carrier dynamics in porous silicon revealed by time‐resolved fluorescence and transient reflectivity

Juška, Gediminas; Medvids, Artūrs; Gulbinas, Vidmantas

doi:10.1002/pssa.200925380

Cited by 5 publications

(7 citation statements)

References 30 publications

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“…Gas sensitive MIS structures based on mesoporous silicon layers with top catalytically active (Pd, Cu, WO 3 ) electrodes have been formed to study the adsorption properties. Gas sensitivity of these structures with top catalytic active electrodes on PS and with pores doped with Cu/WO 3 clusters have been studied by the analysis of I-V characteristics and by high-frequency C-V method under the action of H 2 S and H 2 .…”

Section: Resultsmentioning

confidence: 99%

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Preparation and study of porous Si surfaces obtained using the electrochemical method

Lytovchenko¹

2017

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Review of original results concerning electrochemical formation of porous Si layers and investigation of properties inherent to the formed layers has been presented. The results related with observation of changes in pores' morphology depending on the etching conditions, correlation of morphology of the porous layers with their surface composition, photoluminescence and structural characteristics, catalytic activity of porous Si based MIS structures as well as theoretical modeling of the kinetics and mechanisms of the porous Si growth have been described.

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Section: Resultsmentioning

confidence: 99%

“…The structural data for PS are very complicated. Some published works indicate that highly porous crystalline silicon layers consist of Si columns and pores or of isolated nanocrystallites [3]. On the other hand, PS may be considered as a system of interconnected quantum wells, the so-called "quantum sponge" [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Preparation and study of porous Si surfaces obtained using the electrochemical method

Lytovchenko¹

2017

Semicond. Phys. Quantum Electron. Optoelectron.

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“…Time-gated fluorescence of PS reveals two bands -high energy "blue" fluorescence, which is intensive but decays in less than 5 ns, and low energy "red" fluorescence, which is weaker but stays measurable for over 20 ms [14]. However, the red band dominates in stationary PS fluorescence spectrum since several thousand times longer life time of the red fluorescence overcompensates the few times lower intensity.…”

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confidence: 97%

“…Red fluorescence band usually attributed to nanometer sized Si nanocrystallites [19][20][21][22][23] is also inhomogeneous: fluorescence at different wavelengths decays with different rates and is attributed to nanocrystallites of different dimensions. Such behavior is also ambiguous -increasing relaxation times with longer detection wavelength could also be explained as a result of energy migration between nanocrystallites [14].…”

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confidence: 97%

“…The blue fluorescence in most cases is attributed to the oxidized surface states [15][16][17][18], although extremely small Si crystals -nanocrystallites could recreate the same behavior [14]. Red fluorescence band usually attributed to nanometer sized Si nanocrystallites [19][20][21][22][23] is also inhomogeneous: fluorescence at different wavelengths decays with different rates and is attributed to nanocrystallites of different dimensions.…”

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confidence: 98%

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Excitation energy transfer in porous silicon/laser dye composites

Pranculis

Šimkienė

Treideris

et al. 2013

Phys. Status Solidi A

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Excited state relaxation and energy transfer in porous silicon (PS)/laser dye [oxazine 1 (Ox1), rhodamine 6G (Rh6G)] composites have been studied by means of steady-state and time-resolved fluorescence. Fluorescence decay kinetics reveals the nonradiative energy transfer from PS to the dye. Increased decay rate of the dye luminescence in the composite indicates that opposite energy transfer is also likely. Analysis of the time-resolved fluorescence of the PS/R6G composite also shows that there is no energy transfer from silicon oxide responsible for the "blue" fluorescence band to silicon nanocrystalites, and that interaction between Si nanocrystals responsible for the "red" PS fluorescence is absent or weak. 1 Introduction Since its discovery, porous silicon (PS) proved to be a non-trivial fluorescent system. Having many different energy levels, each with its own relaxation time and at least two distinct fluorescence mechanisms (surface oxide and Si nanocrystallites) PS is still not fully understood.PS/organic material composites were first investigated few years after the discovery of the visible luminescence of PS. Polymers were spin-coated onto PS in order to produce hybrid LEDs with variable fluorescence spectra [1-3], while laser dye impregnation into the pores was motivated by possible application of such composites in laser physics [4][5][6][7]. One of the key processes in such systems -energy transfer, attracted most of the researcher's attention because of its natural complexity resulting from intricate fluorescence of PS.In 1993 Canham [8] reported impregnation of PS with laser dye in order to get a solid state host for optically active media -a goal of great interest still. In his work Canham examined possible energy transfer in such composites. Since then, driven by possible applications of such materials in optoelectronics, a number of researchers investigated PS/ laser dye composites using different techniques and reported energy transfer from PS to the dye as their main findings [9][10][11][12][13].Time-gated fluorescence of PS reveals two bands -high energy "blue" fluorescence, which is intensive but decays in less than 5 ns, and low energy "red" fluorescence, which is

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Fluorescence quenching in porous silicon/conjugated polymer composites

Pranculis

Karpicz

Medvids

et al. 2011

Physica Status Solidi (a)

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Phone: þ370 5 2644851, Fax: þ370 5 2627123 MEH-PPV and m-LPPP polymers were spin-coated onto porous silicon (PS). Quenching of the polymer and PS fluorescence has been investigated by means of time-resolved and steady state fluorescence spectroscopy. Decay kinetics of the PS fluorescence in the blue spectral region attributed to the oxidized silicon surface reveals its quenching by the polymer film. No clear evidence of the opposite process, quenching of the polymer fluorescence by PS has been obtained.

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Initial charge carrier dynamics in porous silicon revealed by time‐resolved fluorescence and transient reflectivity

Cited by 5 publications

References 30 publications

Preparation and study of porous Si surfaces obtained using the electrochemical method

Preparation and study of porous Si surfaces obtained using the electrochemical method

Excitation energy transfer in porous silicon/laser dye composites

Fluorescence quenching in porous silicon/conjugated polymer composites

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