Electrical Control of near-Field Energy Transfer between Quantum Dots and Two-Dimensional Semiconductors

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• 作者：Dhiraj Prasai ; Andrey R. Klots ; AKM Newaz ; J. Scott Niezgoda ; Noah J. Orfield ; Carlos A. Escobar ; Alex Wynn ; Anatoly Efimov ; G. Kane Jennings ; Sandra J. Rosenthal ; Kirill I. Bolotin
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：July 8, 2015
• 年：2015
• 卷：15
• 期：7
• 页码：4374-4380
• 全文大小：376K
• ISSN：1530-6992

文摘

We investigate near-field energy transfer between chemically synthesized quantum dots (QDs) and two-dimensional semiconductors. We fabricate devices in which electrostatically gated semiconducting monolayer molybdenum disulfide (MoS₂) is placed atop a homogeneous self-assembled layer of core鈥搒hell CdSSe QDs. We demonstrate efficient nonradiative F枚rster resonant energy transfer (FRET) from QDs into MoS₂ and prove that modest gate-induced variation in the excitonic absorption of MoS₂ leads to large (鈭?00%) changes in the FRET rate. This in turn allows for up to 鈭?5% electrical modulation of QD photoluminescence intensity. The hybrid QD/MoS₂ devices operate within a small voltage range, allow for continuous modification of the QD photoluminescence intensity, and can be used for selective tuning of QDs emitting in the visible-IR range.