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.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grants (2022R1A4A2000835, 2019R1A2C2003969, 2021M3D1A2049323, 2020R1A6A1A03047771, and 2022R1A2C1010497) and funded by the Ministry of Science and ICT. J.-H.K. acknowledges the support from the Institute for Basic Science of Korea (IBS-R011-D1). The authors thank Dr. W.-S. Chae for FLIM measurements and fruitful discussions.
© 2022 The Authors. Advanced Science published by Wiley-VCH GmbH.
All Science Journal Classification (ASJC) codes
- Medicine (miscellaneous)
- Chemical Engineering(all)
- Materials Science(all)
- Biochemistry, Genetics and Molecular Biology (miscellaneous)
- Physics and Astronomy(all)