Slow relaxation of excited states in strain-induced quantum dots

Gfroerer, T. H.; Sturge, M. D.; Kash, K.; Yater, J.A.; Plaut, A. S.; Lin, Ping; Florez, L. T.; Harbison, J. P.; Das, Samaresh; Lebrun, L.

doi:10.1103/physrevb.53.16474

Cited by 31 publications

(19 citation statements)

References 26 publications

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“…[7][8][9] The stressor island can induce a dilation of the quantum well thereby localizing electrons and holes in the region below the stressor, creating a strain-induced QD ͑SIQD͒. Theoretical 10,11 and experimental work [12][13][14][15][16][17][18][19][20][21] has been done with InP islands as stressors deposited on GaAs/͑InGa͒As and GaAs/͑AlGa͒As QWs.…”

mentioning

confidence: 99%

Two color blinking of single strain-induced GaAs quantum dots

Bertram

Hanna

Nozik

1999

Applied Physics Letters

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mentioning

confidence: 99%

Two color blinking of single strain-induced GaAs quantum dots

Bertram

Hanna

Nozik

1999

Applied Physics Letters

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“…In the strong 3D quantumconfined systems such as semiconductor QDs, phonon bottleneck effect is theoretically predicted due to energy level spacing larger than phonon energy [19]. Although several groups reported observations of phonon bottleneck effect in III-V QDs fabricated by epitaxial techniques [20,21], it has so far not been reported in colloidal CdSe QDs. The trap state model is more plausible, supporting evidences include report by Hines and Guyot-Sionnest here the fluorescence spectrum of CdSe/TOPO has a broad tail arising from what they assigned as surface trap sites in the red region of excitonic luminescence [14].…”

Section: Resultsmentioning

confidence: 99%

Multi-wavelength intermittent photoluminescence of single CdSe quantum dots

Yamasaki¹,

Asami

Isoshima

et al. 2003

Science and Technology of Advanced Materials

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A single chromophore detection using video-microscopy is one of the latest methodologies to reveal unique characteristics, which could not be obtained from ensemble measurements. Among many kinds of subjects, dynamic optical properties observed in colloidal semiconductor nanoparticles are attractive and important not only for the basis of photo-physics but also for application studies, e.g. biological labeling, electronic devices. In this study, fluorescence video-microscopy was performed on cadmium selenide (CdSe) quantum dots (QDs) spin-coated on a glass substrate. From single CdSe QDs detection, emissions at wavelengths separated over 60 nm were observed for the first time. This spectral feature was attributed to the existence of double-emissive relaxation processes in CdSe QDs. Photoluminescence intermittency was also observed both from relaxation processes. Fluorescence video-microscopy, which was advanced in biology, can be applicable for the real-time monitoring of dynamic properties in semiconductor photo-physics. q

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“…There is experimental evidence of slowed cooling in QDs [86,87] where hot electrons exhibited lifetimes from a few picoseconds all the way up to nanoseconds [88]. The hot carrier cooling was found to be greatly affected by the presence of nearby holes.…”

Section: Hot Carrier Cellsmentioning

confidence: 96%

Third generation photovoltaics

Brown

2009

Laser & Photonics Reviews

172

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We review recent progress towards increasing solar cell efficiencies beyond the Shockley-Queisser efficiency limit. Four main approaches are highlighted: multi-junction cells, intermediate-band cells, hot carrier cells and spectrum conversion. Multi-junction cells use multiple solar cells that selectively absorb different regions of the solar spectrum. Intermediateband cells use one junction with multiple bandgaps to increase efficiencies. Hot-carrier cells convert the excess energy of abovebandgap photons into electrical energy. Spectrum conversion solar cells convert the incoming polychromatic sunlight into a narrower distribution of photons suited to the bandgap of the solar cell.The AM 1.5 solar spectrum along with the bandgaps of some semiconductors. Third generation photovoltaics strive to maximize the efficiency of converting polychromatic radiation into electricity.

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Slow relaxation of excited states in strain-induced quantum dots

Cited by 31 publications

References 26 publications

Two color blinking of single strain-induced GaAs quantum dots

Two color blinking of single strain-induced GaAs quantum dots

Multi-wavelength intermittent photoluminescence of single CdSe quantum dots

Third generation photovoltaics

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