SKM 2023 – scientific programme
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DS: Fachverband Dünne Schichten
DS 12: Poster
DS 12.40: Poster
Wednesday, March 29, 2023, 17:00–19:00, P3
Photoinduced charge injection into single-layer WSe2 via deposited dye molecules — •Tim Völzer1,2, Alina Schubert1,2, Julian Schröer1, Rico Schwartz1, Tobias Korn1,2, and Stefan Lochbrunner1,2 — 1Institute of Physics, University of Rostock, Albert-Einstein-Str. 23, 18059 Rostock, Germany — 2Department "Life, Light and Matter", University of Rostock, Albert-Einstein-Str. 25, 18059 Rostock, Germany
The deposition of molecules allows the functionalization of 2D semiconductors as well as the fabrication of hybrid structures exhibiting charge separation after optical excitation that can be exploited in optoelectronic devices. Here, we investigate the charge transfer from optically excited molecules of the dye Perylene Orange (PO) into a monolayer of tungsten diselenide (1L-WSe2) by means of low-temperature micro-photoluminescence spectroscopy: In comparison to the blank 1L-WSe2, the proportion of charged trion versus neutral exciton emission is expected to change as the PO molecules are deposited and excited. In contrast, when reducing the pump photon energy below the PO absorption band, the emission spectrum would remain identical. Thus, we aim to control the light-induced charge injection into the WSe2 by tuning the pump wavelength.