(r). In addition, we observe both in experiment and theory that interestingly the funneling is initially faster and then it slows down approaching a stationary value for the propagation. This effect is well reproduced by the theoretically predicted evolution of dark-exciton occupation and can be ...
However, at the gate voltage of 4 V, the EF is largely flat and slightly <1 (~0.8) when the excitation photon energy is <1.9 eV. When the excitation photon energy >1.9 eV, the PL enhancement effect starts to occur with the EF >1. The EF reaches the maximum value when ...
This structure\nproduces efficient electron鈥揾ole pair generation due to light trapping and\nexciton funneling toward the crest of the WS_2 wrinkles and enhances exciton\nseparation. Additionally, the formation of wrinkles induces an air gap inbetween\nthe 2D layer and substrate, which reduces ...
et al. Dark exciton anti-funneling in atomically thin semiconductors. Nat. Commun. 12, 7221 (2021). 61. Zhang, X.-X., You, Y., Zhao, S. Y. F. & Heinz, T. F. Experimental evidence for dark excitons in monolayer WSe2. Phys. Rev. Lett. 115, 257403 (2015). 62. Robert, C. ...
The influence of charge transfer on the excitonic properties in the type-I band heterostructure by funneling excitons into one layer is very different from that in most TMDCs van der Waals heterostructures with type-II band alignments in which the electrons and holes are confined in two separate ...
along with an efficient exciton funneling10. The lowest excitonic energy state (heavy-hole excitonic transition (1hh − 1e)) is shown in Fig.3c, where the stimulated emission is largely Stokes-shifted with respected to the 1hh − 1eexcitonic feature. This major Stokes shift (~...
Recent experiments have revealed long carrier or exciton spin coherence at liquid-helium temperature19,21, exotic magnetic field-induced spin-mixing effects17, the Rashba effect14,15,16,22and long-range spin-funneling23in perovskite materials or their nanostructures, which have triggered extensive resea...
et al. Dark exciton anti-funneling in atomically thin semiconductors. Nat. Commun. 12, 7221 (2021). 61. Zhang, X.-X., You, Y., Zhao, S. Y. F. & Heinz, T. F. Experimental evidence for dark excitons in monolayer WSe2. Phys. Rev. Lett. 115, 257403 (2015). 62. Robert, C. ...
Another significant finding is that the films gain the highest fluorescence quantum efficiencies of the corresponding laser dyes as a result of site segregation effect, whereas the antenna effect of the POP skeletons greatly amplifies the green and red emissions by 30- and 24-fold compared with ...
Chemical vapor deposition (CVD) allows lateral edge epitaxy of transition metal dichalcogenide heterostructures. Critical for carrier and exciton transport is the material quality and the nature of the lateral heterojunction. Important details of the opt