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Article source: Graphene Magazine? Here, we investigate these processes in the graphene-WS2 heterostructure through complementary detection of the ultrafast terahertz optical conductivity in graphene and the transient absorption kinetics in WS2 after light excitation
.
We have observed that the separated charge lifetime in the heterostructure after CT is very long: more than 1 ns, while the charge separation reported in previous studies is only ~1, which leads to the stone ps
.
High efficiency photochemical of ink
.
In addition, for the CT process of the graphene-WS2 interface, we found that it is carried out by sub-exciton-excited photothermal electron emission and direct hole transfer from WS2 to the valence band of graphene during sub-exciton excitation
.
These findings provide insights for further optimizing the performance of optoelectronic devices, especially light detection
.
? Fig.
1.
The dynamics of non-equilibrium hot carrier at the interface of g-WS2
.
? Fig.
2.
Ultra-fast interface CT and long-life charge separation in graphene-WS2 vdW heterostructure
.
? Fig.
3.
CT efficiency and mechanism of graphene-WS2 interface
.
? Relevant research results were published in Science Advances (DOI: 10.
1126/sciadv.
abd9061) by the Hai I.
Wang group of Max Planck Institute of Polymer Research in Germany in 2021
.
Original: Long-lived charge separation following pump-wavelength–dependent ultrafast charge transfer in graphene/WS2 heterostructures
.
.
We have observed that the separated charge lifetime in the heterostructure after CT is very long: more than 1 ns, while the charge separation reported in previous studies is only ~1, which leads to the stone ps
.
High efficiency photochemical of ink
.
In addition, for the CT process of the graphene-WS2 interface, we found that it is carried out by sub-exciton-excited photothermal electron emission and direct hole transfer from WS2 to the valence band of graphene during sub-exciton excitation
.
These findings provide insights for further optimizing the performance of optoelectronic devices, especially light detection
.
? Fig.
1.
The dynamics of non-equilibrium hot carrier at the interface of g-WS2
.
? Fig.
2.
Ultra-fast interface CT and long-life charge separation in graphene-WS2 vdW heterostructure
.
? Fig.
3.
CT efficiency and mechanism of graphene-WS2 interface
.
? Relevant research results were published in Science Advances (DOI: 10.
1126/sciadv.
abd9061) by the Hai I.
Wang group of Max Planck Institute of Polymer Research in Germany in 2021
.
Original: Long-lived charge separation following pump-wavelength–dependent ultrafast charge transfer in graphene/WS2 heterostructures
.