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- W4313278768 abstract "Rhombohedrally stacked MoS 2 has been shown to exhibit spontaneous polarization down to the bilayer limit and can sustain a strong depolarization field when sandwiched between graphene. Such a field gives rise to a spontaneous photovoltaic effect without needing any p-n junction. In this work, we show that the photovoltaic effect has an external quantum efficiency of 10% for devices with only two atomic layers of MoS 2 at low temperatures, and identify a picosecond-fast photocurrent response, which translates to an intrinsic device bandwidth at ∼100-GHz level. To this end, we have developed a nondegenerate pump-probe photocurrent spectroscopy technique to deconvolute the thermal and charge-transfer processes, thus successfully revealing the multicomponent nature of the photocurrent dynamics. The fast component approaches the limit of the charge-transfer speed at the graphene-MoS 2 interface. The remarkable efficiency and ultrafast photoresponse in the graphene-3R-MoS 2 devices support the use of ferroelectric van der Waals materials for future high-performance optoelectronic applications." @default.
- W4313278768 created "2023-01-06" @default.
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- W4313278768 date "2022-12-16" @default.
- W4313278768 modified "2023-09-26" @default.
- W4313278768 title "Ultrafast response of spontaneous photovoltaic effect in 3R-MoS <sub>2</sub> –based heterostructures" @default.
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- W4313278768 doi "https://doi.org/10.1126/sciadv.ade3759" @default.
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