
Proceedings Paper
Ultrafast charge transfer in heterostructures of 2D materials (Conference Presentation)
Paper Abstract
We use ultrafast spectroscopy to resolve the interlayer charge scattering processes in heterostructures (HS) of two-dimensional materials. In a WSe2/MoSe2 HS we photogenerate intralayer excitons in MoSe2 and observe hole injection in WSe2 on the sub-picosecond timescale, leading to the formation of interlayer excitons. The temperature dependence of the build-up and decay of interlayer excitons provide insights into the coupling mechanisms. In a graphene/WS2 HS we observe ultrafast charge transfer from graphene to the semiconductor. The data are consistent with hot electron/hole transfer, whereby a tail the hot Fermi-Dirac carrier distribution in graphene tunnels through the Schottky barrier into WS2.
Paper Details
Date Published: 10 March 2020
PDF
Proc. SPIE 11278, Ultrafast Phenomena and Nanophotonics XXIV, 112781B (10 March 2020); doi: 10.1117/12.2544386
Published in SPIE Proceedings Vol. 11278:
Ultrafast Phenomena and Nanophotonics XXIV
Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)
Proc. SPIE 11278, Ultrafast Phenomena and Nanophotonics XXIV, 112781B (10 March 2020); doi: 10.1117/12.2544386
Show Author Affiliations
Zilong Wang, Politecnico di Milano (Italy)
Giulio N. Cerullo, Politecnico di Milano (Italy)
Giulio N. Cerullo, Politecnico di Milano (Italy)
Published in SPIE Proceedings Vol. 11278:
Ultrafast Phenomena and Nanophotonics XXIV
Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)
© SPIE. Terms of Use
