2008
DOI: 10.1021/jp800834h
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Carrier Multiplication and Its Reduction by Photodoping in Colloidal InAs Quantum Dots

Abstract: In our earlier paper, 1 we reported carrier multiplication (CM) in colloidal InAs quantum dots (QDs) and CM in dots with a pre-population of one exciton. The occurrence of CM in relaxed InAs QDs was concluded from the results of time-resolved TeraHertz (THz). Both THz and quasi-continuous wave (quasi-CW) experiments were performed to study the CM in preexcited dots. Recent attempts to reproduce the observations of CM using THz spectroscopy on InAs based QDs of two sizes were unsuccessful. These attempts follow… Show more

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Cited by 87 publications
(110 citation statements)
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“…Results of measurements based on (a) and (b) have been shown to yield identical results for PbSe NCs in solution [14]. In addition to ultrafast spectroscopic techniques, a quasi-cw photoluminescence technique based on nanosecond laser pulses enables the observation of multiexciton states through analysis of the spectral signature for biexciton radiative emission [60,61]. The majority of reports of MEG have been based on ultrafast transient absorption and emission techniques.…”
Section: Multiple Exciton Generation Measurement and Analysismentioning
confidence: 89%
See 1 more Smart Citation
“…Results of measurements based on (a) and (b) have been shown to yield identical results for PbSe NCs in solution [14]. In addition to ultrafast spectroscopic techniques, a quasi-cw photoluminescence technique based on nanosecond laser pulses enables the observation of multiexciton states through analysis of the spectral signature for biexciton radiative emission [60,61]. The majority of reports of MEG have been based on ultrafast transient absorption and emission techniques.…”
Section: Multiple Exciton Generation Measurement and Analysismentioning
confidence: 89%
“…Contradicting the CdSe results reported by Schaller, a report from Nair et al also utilized time-resolved PL and found no evidence of significant MEG for CdSe and CdTe NCs following photoexcitation up to hν > 3E g [62]. In the case of work from Pijpers et al on InAs core-shell NCs [61], the authors originally published positive MEG results using three different techniques but subsequently raised concerns about their results in a recently-published correction [61].…”
Section: Multiple Exciton Generation Measurement and Analysismentioning
confidence: 99%
“…14 Later the same group reported that their original TRTS results could not be reproduced on a new set of similarly prepared samples, 17 without mentioning whether the TA or the quasi-cw results also could not be reproduced. This apparent retraction and the later independent TA study are in contradiction to a TA study from Schaller and Kilmov 18 showing enhanced QYs in InAs/ZnSe core/ shell NCs, but with a lower efficiency than found in the original Pijpers report.…”
mentioning
confidence: 99%
“…The physics behind this enhancement is the suppression of exciton decay by phonon emission in NPs (the "phonon bottleneck") due to the reduced number of available vibrational states, and the more facile creation of additional excitons due to stronger Coulomb interaction in NPs from less efficient screening. Recent studies on II-VI and III-V NPs found that MEG efficiencies are smaller than originally suggested [11][12][13][14][15][16][17] , and depend on surface chemistry, NP concentration, and measurement conditions that can lead to charging [18][19][20][21][22][23] . While the degree of enhancement is debated by these papers, all of them agree that MEG does occur in PbSe 14,17,23 .…”
mentioning
confidence: 99%