Long lived photogenerated charge carriers in few-layer transition metal dichalcogenides obtained from liquid phase exfoliation
Morabito, Floriana (Consiglio Nazionale delle Ricerche Istituto Officina dei Materiali)
Synnatschke, Kevin (Trinity College Dublin)
Mehew, Jake Dudley (Institut Català de Nanociència i Nanotecnologia)
Varghese, Sebin (Institut Català de Nanociència i Nanotecnologia)
Sayers, Charles James (Politecnico di Milano. Dipartimento di Fisica)
Folpini, Giulia (Istituto Italiano di Tecnologia)
Petrozza, Annamaria (Istituto Italiano di Tecnologia)
Cerullo, Giulio (Politecnico di Milano. Dipartimento di Fisica)
Tielrooij, Klaas-Jan (Institut Català de Nanociència i Nanotecnologia)
Coleman, Jonathan (Trinity College Dublin)
Nicolosi, Valeria (Trinity College Dublin)
Gadermaier, Christoph (Istituto Italiano di Tecnologia)

Data:	2023
Resum:	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 MoS and WS 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.
Ajuts:	European Commission 771528 European Commission 894369 Ministerio de Economía y Competitividad FPI-SO2018
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Dichalcogenides ; Fabrication technique ; Intense light ; Light-matter interactions ; Liquid Phase ; Liquid phasis ; Optoelectronic materials ; Photogenerated charge carriers ; Semiconducting transition ; Wide selection
Publicat a:	Nanoscale advances, Vol. 6, Issue 4 (February 2023) , p. 1074-1083, ISSN 2516-0230

DOI: 10.1039/d3na00862b
PMID: 38356640

11 p, 1.6 MB

El registre apareix a les col·leccions:
Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > Institut Català de Nanociència i Nanotecnologia (ICN2)
Articles > Articles de recerca
Articles > Articles publicats