Exciton Transfer at Heterointerfaces of MoS2 Monolayers and Fluorescent Molecular Aggregates

Soyeong Kwon, Dong Yeun Jeong, Chengyun Hong, Saejin Oh, Jungeun Song, Soo Ho Choi, Ki Kang Kim, Seokhyun Yoon, Taeyoung Choi, Ki Ju Yee, Ji Hee Kim, Youngmin You, Dong Wook Kim

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Integration of distinct materials to form heterostructures enables the proposal of new functional devices based on emergent physical phenomena beyond the properties of the constituent materials. The optical responses and electrical transport characteristics of heterostructures depend on the charge and exciton transfer (CT and ET) at the interfaces, determined by the interfacial energy level alignment. In this work, heterostructures consisting of aggregates of fluorescent molecules (DY1) and 2D semiconductor MoS2 monolayers are fabricated. Photoluminescence spectra of DY1/MoS2 show quenching of the DY1 emission and enhancement of the MoS2 emission, indicating a strong electronic interaction between these two materials. Nanoscopic mappings of the light-induced contact potential difference changes rule out the CT process at the interface. Using femtosecond transient absorption spectroscopy, the rapid interfacial ET process from DY1 aggregates to MoS2 and a fourfold extension of the exciton lifetime in MoS2 are elucidated. These results suggest that the integration of 2D inorganic semiconductors with fluorescent molecules can provide versatile approaches to engineer the physical characteristics of materials for both fundamental studies and novel optoelectronic device applications.

Original languageEnglish
Article number2201875
JournalAdvanced Science
Issue number23
StatePublished - 15 Aug 2022

Bibliographical note

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© 2022 The Authors. Advanced Science published by Wiley-VCH GmbH.


  • MoS2
  • contact potential difference
  • exciton transfer
  • molecular aggregates
  • photoluminescence


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