Exciton and Trion Energy Transfer from Giant Semiconductor Nanocrystals to MoS2 Monolayers

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• 作者：Siddharth Sampat ; Tianle Guo ; Kehao Zhang ; Joshua A. Robinson ; Yagnaseni Ghosh ; Krishna P. Acharya ; Han Htoon ; Jennifer A. Hollingsworth ; Yuri N. Gartstein ; Anton V. Malko
• 刊名：ACS Photonics
• 出版年：2016
• 出版时间：April 20, 2016
• 年：2016
• 卷：3
• 期：4
• 页码：708-715
• 全文大小：654K
• 年卷期：0
• ISSN：2330-4022

文摘

We investigate nonradiative energy transfer (NRET) between CdSe/CdS core/shell “giant” nanocrystal quantum dots (gNQDs) and monolayer domains of molybdenum disulfide (MoS₂) grown by chemical vapor deposition. We employ three sets of gNQDs with varied core/shell parameters that exhibit radiative emission from neutral and charged excitons (trions) at different spectral positions from 590 to 660 nm as confirmed by photon statistics of individual nanocrystals. Strong photoluminescence (PL) emission quenching is observed for the donor gNQDs placed on MoS₂ domains, indicative of the efficient NRET. Analysis of the double-component PL decays reveals NRET from both neutral excitons and charged trions with the same efficiency. Applying a macroscopic electrodynamics model for the decay of electric-dipole emitters in the vicinity of an ultrathin semiconducting layer with a strong in-plane excitonic polarizability, we confirm high NRET efficiencies from >95% to 85% for dots with diameters from 10 to 20 nm. This demonstration opens new possibilities for studies of energy transfer between zero-dimensional emitters and two-dimensional absorbers, potentially enabling new avenues for multiexciton harvesting and utilization.