Journal
NANO LETTERS
Volume 10, Issue 1, Pages 164-170Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl903172f
Keywords
Colloidal quantum dots; carrier multiplication; type-II band alignment
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Funding
- Israeli Science Foundation [1621/07]
- German-Israeli Foundation [2.1.98-1856.7/2008]
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We experimentally investigate carrier multiplication (CM) in type II CdTe/CdSe quantum dot (QD) heterostructures by the means of a simple and robust subnanosecond transient photoluminescence spectroscopy setup. Experimental conditions were set to minimize the blurring of the CM signature by extraneous effects. The extracted photon energy threshold for CM is consistent with previous studies in CdSe and CdTe QDs (around 2.65 times the type II energy band gap) and we can infer an upper bound to CM yield. This study indicates that, while CM is probably present in type II QD heterostructures below the CM threshold for each constituent separately, it exhibits only a modest yield.
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