Excitonic enhancement of nonradiative energy transfer to bulk silicon with the hybridization of cascaded quantum dots

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Excitonic enhancement of nonradiative energy transfer to bulk silicon with the hybridization of cascaded quantum dots.pdf (969.52 KB)

Date

2013

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Source Title

Applied Physics Letters

Print ISSN

0003-6951

Electronic ISSN

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AIP

Volume

103

Issue

26

Pages

Language

English

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Article

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Abstract

We report enhanced sensitization of silicon through nonradiative energy transfer (NRET) of the excitons in an energy-gradient structure composed of a cascaded bilayer of green- and red-emitting CdTe quantum dots (QDs) on bulk silicon. Here NRET dynamics were systematically investigated comparatively for the cascaded energy-gradient and mono-dispersed QD structures at room temperature. We show experimentally that NRET from the QD layer into silicon is enhanced by 40% in the case of an energy-gradient cascaded structure as compared to the mono-dispersed structures, which is in agreement with the theoretical analysis based on the excited state population-depopulation dynamics of the QDs. © 2013 AIP Publishing LLC.

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Keywords

Bulk silicon , Cascaded structure , Cdte quantum dots (QDs) , Mono-dispersed , Nonradiative energy transfer , Red-emitting , Room temperature , Silicon through , Cascade control systems , Energy transfer , Stainless steel , Silicon

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http://hdl.handle.net/11693/26693

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http://dx.doi.org/10.1063/1.4858384

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Department of Physics
Institute of Materials Science and Nanotechnology (UNAM)