About: Blinking Statistics of Silicon Quantum Dots

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Description	The blinking statistics of numerous single silicon quantum dots fabricated by electron-beam lithography, plasma etching, and oxidation have been analyzed. Purely exponential on- and off-time distributions were found consistent with the absence of statistical aging. This is in contrast to blinking reports in the literature where power-law distributions prevail as well as observations of statistical aging in nanocrystal ensembles. A linear increase of the switching frequency with excitation power density indicates a domination of single-photon absorption processes, possibly through a direct transfer of charges to trap states without the need for a bimolecular Auger mechanism. Photoluminescence saturation with increasing excitation is not observed; however, there is a threshold in excitation (coinciding with a mean occupation of one exciton per nanocrystal) where a change from linear to square-root increase occurs. Finally, the statistics of blinking of single quantum dots in terms of average on-time, blinking frequency and blinking amplitude reveal large variations (several orders) without any significant correlation demonstrating the individual microscopic character of each quantum dot. The blinking statistics of numerous single silicon quantum dots fabricated by electron-beam lithography, plasma etching, and oxidation have been analyzed. Purely exponential on- and off-time distributions were found consistent with the absence of statistical aging. This is in contrast to blinking reports in the literature where power-law distributions prevail as well as observations of statistical aging in nanocrystal ensembles. A linear increase of the switching frequency with excitation power density indicates a domination of single-photon absorption processes, possibly through a direct transfer of charges to trap states without the need for a bimolecular Auger mechanism. Photoluminescence saturation with increasing excitation is not observed; however, there is a threshold in excitation (coinciding with a mean occupation of one exciton per nanocrystal) where a change from linear to square-root increase occurs. Finally, the statistics of blinking of single quantum dots in terms of average on-time, blinking frequency and blinking amplitude reveal large variations (several orders) without any significant correlation demonstrating the individual microscopic character of each quantum dot. (en)
Title	Blinking Statistics of Silicon Quantum Dots Blinking Statistics of Silicon Quantum Dots (en)
skos:prefLabel	Blinking Statistics of Silicon Quantum Dots Blinking Statistics of Silicon Quantum Dots (en)
skos:notation	RIV/00216208:11320/11:10109172!RIV12-AV0-11320___
http://linked.open...avai/predkladatel	Matematicko-fyzikální fakulta
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(KAN400100701), P(LC510), Z(MSM0021620835)
http://linked.open...iv/cisloPeriodika	12
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Valenta, Jan
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	188502
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/11:10109172
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	bleaching; statistical aging; photoluminescence; nanocrystal; quantum dot; silicon; intermittency; Blinking (en)
http://linked.open.../riv/klicoveSlovo	photoluminescence quantum dot silicon intermittency Blinking bleaching nanocrystal statistical aging
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[7597B763FF97]
http://linked.open...i/riv/nazevZdroje	Nano Letters
http://linked.open...in/vavai/riv/obor	BH
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Center of nanotechnology and materials for nanoelectronics Functional hybrid nanosystems of semiconductors and metals with organic materials (FUNS)
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	11
http://linked.open...iv/tvurceVysledku	Bruhn, Benjamin Fatemeh, Sangghaleh Linnros, Jan Valenta, Jan
http://linked.open...ain/vavai/riv/wos	000297950200081
http://linked.open...n/vavai/riv/zamer	Fyzika molekulárních, makromolekulárních a biologických systémů
issn	1530-6984
number of pages	7 (xsd:int)
http://bibframe.org/vocab/doi	10.1021/nl203618h
http://localhost/t...ganizacniJednotka	11320
is http://linked.open...avai/riv/vysledek of	Blinking Statistics of Silicon Quantum Dots Blinking Statistics of Silicon Quantum Dots

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