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1 August 2021 Exciton and excited-state charge transfer at 2D van der Waals interfaces
Sylke Blumstengel, Soohyung Park, Niklas Mutz, Sergey A. Kovalenko, Thorsten Schultz, Emil J. W. List-Kratochvil, Julia Stähler, Norbert Koch
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Proceedings Volume 11799, Physical Chemistry of Semiconductor Materials and Interfaces XX; 117990Z (2021) https://doi.org/10.1117/12.2594211
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States
Abstract
Combination of monolayer (ML) transition metal dichalcogenides (TMDC) with molecular layers with strong light matter coupling can enhance, control, and spectrally tune the absorption and emission of such heterostructures. Essential is hereby the energy level alignment at the heterointerface that governs the transfer of electronic excitations. At interfaces with a staggered type-II energy level alignment fast excited-state charge transfer has been utilized to enhance and spectrally expand the photoresponse of MoS2-based hybrid photodetectors. At interfaces with a straddling type-I energy level alignment, transfer of excitons on a sub-picosecond time scale results in an enhanced PL yield from ML-MoS2 in the heterostructure and an according overall modulation of the photo-response.
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Sylke Blumstengel, Soohyung Park, Niklas Mutz, Sergey A. Kovalenko, Thorsten Schultz, Emil J. W. List-Kratochvil, Julia Stähler, and Norbert Koch "Exciton and excited-state charge transfer at 2D van der Waals interfaces", Proc. SPIE 11799, Physical Chemistry of Semiconductor Materials and Interfaces XX, 117990Z (1 August 2021); https://doi.org/10.1117/12.2594211
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KEYWORDS
Interfaces
Excitons
Heterojunctions
Molecules
Optoelectronics
Photodetectors
Photoemission spectroscopy
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