Reduced Dielectric Screening and Enhanced Energy Transfer in Single- and Few-Layer MoS[subscript 2]
Author(s)Prins, Ferry; Tisdale, William A.; Goodman, Aaron Jacob
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We report highly efficient nonradiative energy transfer from cadmium selenide (CdSe) quantum dots to monolayer and few-layer molybdenum disulfide (MoS[subscript 2]). The quenching of the donor quantum dot photoluminescence increases as the MoS[subscript 2] flake thickness decreases with the highest efficiency (>95%) observed for monolayer MoS[subscript 2]. This counterintuitive result arises from reduced dielectric screening in thin layer semiconductors having unusually large permittivity and a strong in-plane transition dipole moment, as found in MoS[subscript 2]. Excitonic energy transfer between a zero-dimensional emitter and a two-dimensional absorber is fundamentally interesting and enables a wide range of applications including broadband optical down-conversion, optical detection, photovoltaic sensitization, and color shifting in light-emitting devices.
DepartmentMassachusetts Institute of Technology. Department of Chemical Engineering; Massachusetts Institute of Technology. Department of Chemistry; Massachusetts Institute of Technology. Research Laboratory of Electronics
American Chemical Society (ACS)
Prins, Ferry, Aaron J. Goodman, and William A. Tisdale. “Reduced Dielectric Screening and Enhanced Energy Transfer in Single- and Few-Layer MoS[subscript 2].” Nano Lett. 14, no. 11 (November 12, 2014): 6087–6091.