4.8 Article

Boosting quantum yields in two-dimensional semiconductors via proximal metal plates

期刊

NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -

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NATURE PORTFOLIO
DOI: 10.1038/s41467-021-27418-x

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资金

  1. Samsung Research Funding & Incubation Center of Samsung Electronics [SRFC-MA1802-02]
  2. Department of Science and Technology (DST)
  3. Brazilian Research Council (CNPq), through the PRONEX/FUNCAP program
  4. Brazilian Research Council (CNPq), through the PQ program
  5. Research Foundation - Flanders (FWO)
  6. Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [SFB 1277, 314695032, CH 1672/1, 287022282]
  7. Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter ct.qmat [EXC 2147, 390858490]
  8. Elemental Strategy Initiative conducted by the MEXT, Japan [JPMXP0112101001]
  9. JSPS KAKENHI [19H05790, 20H00354, 21H05233]
  10. A3 Foresight by JSPS

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The authors demonstrate that screening exciton-exciton interaction in monolayer WS2 using proximal metal plates can significantly enhance the quantum yield.
The short exciton lifetime and strong exciton-exciton interaction in transition metal dichalcogenides limit the efficiency of exciton emission. Here, the authors show that exciton-exciton interaction in monolayer WS2 can be screened using proximal metal plates, leading to an improved quantum yield. Monolayer transition metal dichalcogenides (1L-TMDs) have tremendous potential as atomically thin, direct bandgap semiconductors that can be used as convenient building blocks for quantum photonic devices. However, the short exciton lifetime due to the defect traps and the strong exciton-exciton interaction in TMDs has significantly limited the efficiency of exciton emission from this class of materials. Here, we show that exciton-exciton interaction in 1L-WS2 can be effectively screened using an ultra-flat Au film substrate separated by multilayers of hexagonal boron nitride. Under this geometry, induced dipolar exciton-exciton interaction becomes quadrupole-quadrupole interaction because of effective image dipoles formed within the metal. The suppressed exciton-exciton interaction leads to a significantly improved quantum yield by an order of magnitude, which is also accompanied by a reduction in the exciton-exciton annihilation (EEA) rate, as confirmed by time-resolved optical measurements. A theoretical model accounting for the screening of the dipole-dipole interaction is in a good agreement with the dependence of EEA on exciton densities. Our results suggest that fundamental EEA processes in the TMD can be engineered through proximal metallic screening, which represents a practical approach towards high-efficiency 2D light emitters.

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