1. Interfacial Charge Transfer and Ultrafast Photonics Application of 2D Graphene/InSe Heterostructure
- Author
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Li, Jialin, Wang, Lizhen, Chen, Yuzhong, Li, Yujie, Zhu, Haiming, Li, Linjun, and Tong1, Limin
- Subjects
Condensed Matter - Mesoscale and Nanoscale Physics ,charge transfer ,graphene/InSe heterostructure ,pump–probe ,nonlinear absorption ,nonlinear photonic application ,General Chemical Engineering ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,FOS: Physical sciences ,General Materials Science ,Physics - Optics ,Optics (physics.optics) - Abstract
Interface interactions in 2D vertically stacked heterostructures play an important role in optoelectronic applications, and photodetectors based on graphene/InSe heterostructures show promising performance nowadays. However, nonlinear optical property studies based on the graphene/InSe heterostructure are insufficient. Here, we fabricated a graphene/InSe heterostructure by mechanical exfoliation and investigated the optically induced charge transfer between graphene/InSe heterostructures by taking photoluminescence and pump–probe measurements. The large built-in electric field at the interface was confirmed by Kelvin probe force microscopy. Furthermore, due to the efficient interfacial carrier transfer driven by the built-in electric potential (~286 meV) and broadband nonlinear absorption, the application of the graphene/InSe heterostructure in a mode-locked laser was realized. Our work not only provides a deeper understanding of the dipole orientation-related interface interactions on the photoexcited charge transfer of graphene/InSe heterostructures, but also enriches the saturable absorber family for ultrafast photonics application.
- Published
- 2022
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