Electric field induced variations of excited state lifetimes and photoluminescence spectra in 2D heterostructures

Michael Engel; Mathias Steiner

doi:10.1117/12.2529461

9 September 2019 Electric field induced variations of excited state lifetimes and photoluminescence spectra in 2D heterostructures

Michael Engel, Mathias Steiner

Author Affiliations +

Proceedings Volume 11085, Low-Dimensional Materials and Devices 2019; 110850W (2019) https://doi.org/10.1117/12.2529461
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States

Abstract

Here we present electric field-controlled, two-dimensional (2D) exciton dynamics in transition metal dichalcogenide monolayers. We have experimentally investigated the spectral and temporal properties of the A-exciton in a molybdenum diselenide (MoSe₂) monolayer under controlled variation of a vertical, electric dc field at room temperature. By using steady-state and timeresolved photoluminescence spectroscopies, we have observed dc field-induced spectral shifts and linewidth broadenings that are consistent with the shortening of the exciton’s non-radiative lifetime due to field-induced dissociation. We discuss the implications of the results for future developments in nanoscale metrology and exploratory, optoelectronics technologies based on layered, 2D semiconductors.

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Michael Engel and Mathias Steiner "Electric field induced variations of excited state lifetimes and photoluminescence spectra in 2D heterostructures", Proc. SPIE 11085, Low-Dimensional Materials and Devices 2019, 110850W (9 September 2019); https://doi.org/10.1117/12.2529461

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