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Proceedings Paper

Ultrafast charge transfer in heterostructures of 2D materials (Conference Presentation)
Author(s): Stefano Dal Conte; Chiara Trovatello; Zilong Wang; Giulio N. Cerullo

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
Proc. SPIE 11278, Ultrafast Phenomena and Nanophotonics XXIV, 112781B (10 March 2020); doi: 10.1117/12.2544386
Show Author Affiliations
Stefano Dal Conte, Politecnico di Milano (Italy)
Chiara Trovatello, Politecnico di Milano (Italy)
Zilong Wang, 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)

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