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Title: Electron transfer and cascade relaxation dynamics of graphene quantum dots/MoS2 monolayer mixed-dimensional van der Waals heterostructures
Authors: Shan, Hangyong
Yu, Ying
Zhang, Rui
Cheng, Runtan
Zhang, Dong
Luo, Yang
Wang, Xingli
Li, Bowen
Zu, Shuai
Lin, Feng
Liu, Zheng
Chang, Kai
Fang, Zheyu
Keywords: Science::Physics
Issue Date: 2019
Source: Shan, H., Yu, Y., Zhang, R., Cheng, R., Zhang, D., Luo, Y., . . . Fang, Z. (2019). Electron transfer and cascade relaxation dynamics of graphene quantum dots/MoS2 monolayer mixed-dimensional van der Waals heterostructures. Materials Today, 24, 10-16. doi:10.1016/j.mattod.2019.01.015
Journal: Materials Today 
Abstract: Van der Waals (VdW) heterostructures have emerged as promising materials for atomically thin optoelectronic and photovoltaic applications, where the efficient charge separation after photo-excitation is significant to enhance device performances. However, modulating the interfacial charge transfer is still challenging due to the weak interlayer VdW interaction. Revealing electron transfer and relaxation processes in heterostructures lays foundation to tune the interfacial dynamics and optoelectronic properties. Here, we realize the efficient modulation of relaxation channels in MoS2 monolayers and interfacial electron transfer by forming mixed-dimensional VdW heterostructures with graphene quantum dots (GQDs). With femtosecond pump–probe spectroscopy, the biphasic electron injection model and modified rate equations are employed to quantitatively solve interfacial transfer rates of mixed-dimensional VdW heterostructures. We find that the cascaded relaxation of hot electrons in GQDs that originates from the quantum confinement effect can intensively affect the interfacial dynamics. Our established model is instructive to optimize performances of future photon-harvesting devices based on mixed low-dimensional heterostructures.
ISSN: 1369-7021
DOI: 10.1016/j.mattod.2019.01.015
Rights: © 2019 Elsevier Ltd. All rights reserved. This paper was published in Materials Today and is made available with permission of Elsevier Ltd.
Fulltext Permission: embargo_20211231
Fulltext Availability: With Fulltext
Appears in Collections:NTC Journal Articles

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