Issue 4, 2024

Long lived photogenerated charge carriers in few-layer transition metal dichalcogenides obtained from liquid phase exfoliation

Abstract

Semiconducting transition metal dichalcogenides are important optoelectronic materials thanks to their intense light–matter interaction and wide selection of fabrication techniques, with potential applications in light harvesting and sensing. Crucially, these applications depend on the lifetimes and recombination dynamics of photogenerated charge carriers, which have primarily been studied in monolayers obtained from labour-intensive mechanical exfoliation or costly chemical vapour deposition. On the other hand, liquid phase exfoliation presents a high throughput and cost-effective method to produce dispersions of mono- and few-layer nanosheets. This approach allows for easy scalability and enables the subsequent processing and formation of macroscopic films directly from the liquid phase. Here, we use transient absorption spectroscopy and spatiotemporally resolved pump–probe microscopy to study the charge carrier dynamics in tiled nanosheet films of MoS2 and WS2 deposited from the liquid phase using an adaptation of the Langmuir–Schaefer technique. We find an efficient photogeneration of charge carriers with lifetimes of several nanoseconds, which we ascribe to stabilisation at nanosheet edges. These findings provide scope for photocatalytic and photodetector applications, where long-lived charge carriers are crucial, and suggest design strategies for photovoltaic devices.

Graphical abstract: Long lived photogenerated charge carriers in few-layer transition metal dichalcogenides obtained from liquid phase exfoliation

Supplementary files

Article information

Article type
Paper
Submitted
07 Oct 2023
Accepted
26 Nov 2023
First published
29 Nov 2023
This article is Open Access
Creative Commons BY license

Nanoscale Adv., 2024,6, 1074-1083

Long lived photogenerated charge carriers in few-layer transition metal dichalcogenides obtained from liquid phase exfoliation

F. Morabito, K. Synnatschke, J. D. Mehew, S. Varghese, C. J. Sayers, G. Folpini, A. Petrozza, G. Cerullo, K. Tielrooij, J. Coleman, V. Nicolosi and C. Gadermaier, Nanoscale Adv., 2024, 6, 1074 DOI: 10.1039/D3NA00862B

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