SKM 2023 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 8: 2D Materials II (joint session HL/CPP)
HL 8.3: Talk
Monday, March 27, 2023, 15:30–15:45, POT 81
Photoluminescence tuning in hybrid devices of monolayer transition metal dichalcogenides and rylene dyes — •Theresa Kuechle1, Gergely Knorr2, Kalina Peneva2, and Giancarlo Soavi1 — 1Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany — 2Institute of Organic Chemistry and Macromolecular Chemistry, Friedrich Schiller University Jena, Lessingstraße 8, 07743 Jena, Germany
Monolayer transition metal dichalcogenides (TMDs) are direct gap semiconductors that hold great promise for applications in nanoscale photonics and optoelectronic devices. A viable path for the development of devices with advanced functionalities and tunable properties is the integration with other nanoscale systems such as nanowires [1] and molecules [2]. Here, we realize hybrid devices based on TMDs and rylene dyes and study their optical properties via steady state photoluminescence. Preliminary results show that the PL emission in hybrid structures of WS2/CN4PMI can be quenched by a factor of 3, in the case of WSe2/CN4PMI by 300. We tentatively assign this variation to a different band alignment in the two heterostructures and to the interplay between charge transfer (in type II) and energy transfer (in type I). Future experiments including ultrafast pump-probe spectroscopy of pristine and hybrid systems as well as hybridization of different (tunable) molecules will further elucidate the role of band alignment in the ultrafast charge and energy transfer processes at the nanoscale.
[1] Kim et al., ACS Nano 14, 9, 4323 (2020)
[2] Park et al., Adv. Mat. Interfaces 8, 12, 2100215 (2021)