Morabito, F. (2023) Nanosecond dynamics in few-layer and heterojunction transition metal dichalcogenides from liquid phase exfoliation. Il nuovo cimento C, 46 (3). pp. 1-6. ISSN 1826-9885
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Abstract
The lifetimes of photogenerated charge carriers must be long enough to guarantee high efficiency of light harvesting devices. Two-dimensional transition metal dichalcogenides (TMDs) are promising materials due to their intense lightmatter interaction. Liquid phase exfoliation is a low-cost, versatile, scalable method able to produce polydisperse nanosheets in the form of inks. Here, we use nanosecond transient absorption spectroscopy to investigate the charge carrier dynamics in MoS2, WS2, and heterojunctions (HJs) of the two. We observe that the HJ stacking order does not affect the dynamics. We find that in thicker and larger flakes of the single material the carrier lifetime is significantly longer than even in HJs, due to different electronic contributions from nanosheet basal plane and edges. We conclude that there is no need for additional complexity in stacking two TMDs, and transport properties are enhanced in thicker and larger flakes. Our findings can be exploited for device fabrication.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 29 Jan 2024 12:16 |
| Last Modified: | 29 Jan 2024 12:16 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/22600 |
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