The optoelectronic properties of a material are determined by the processes following light-matter interaction. Here we use femtosecond optical spectroscopy to systematically study photoexcited carrier relaxation in few-layer MoS2flakes as a function of excitation density and sample thickness. We find bimolecular coalescence of charges into indirect excitons as the dominant relaxation process in two- to three-layer flakes while thicker flakes show a much higher density of defects, which efficiently trap charges before they can coalesce.

Charge trapping and coalescence dynamics in few layer MoS2

BORZDA, TETIANA;Cerullo, Giulio;Gadermaier, Christoph
2018-01-01

Abstract

The optoelectronic properties of a material are determined by the processes following light-matter interaction. Here we use femtosecond optical spectroscopy to systematically study photoexcited carrier relaxation in few-layer MoS2flakes as a function of excitation density and sample thickness. We find bimolecular coalescence of charges into indirect excitons as the dominant relaxation process in two- to three-layer flakes while thicker flakes show a much higher density of defects, which efficiently trap charges before they can coalesce.
defects; femtosecond dynamics; liquid phase exfoliation; molybdenum disulfide; pump-probe; transition metal dichalcogenides; traps; Chemistry (all); Materials Science (all); Condensed Matter Physics; Mechanics of Materials; Mechanical Engineering
File in questo prodotto:
File Dimensione Formato  
Charge trapping and coalescence dynamics in few layer MoS2.pdf

Open Access dal 17/04/2018

: Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione 1.48 MB
Formato Adobe PDF
1.48 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1053000
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 19
  • ???jsp.display-item.citation.isi??? 15
social impact