Ultrafast Charge Transfer Dynamics at the MoS$_2$/Au Interface Observed via Optical Spectroscopy under Ambient Conditions

TL;DR

This study uses optical spectroscopy to observe ultrafast charge transfer at the MoS₂/Au interface, revealing sub-20 femtosecond hot electron injection and subsequent relaxation processes, advancing understanding of TMDC-metal interactions.

Contribution

It provides the first direct optical measurement of charge transfer dynamics at the K point of MoS₂ on gold under ambient conditions, highlighting ultrafast injection and relaxation mechanisms.

Findings

Hot electrons inject into MoS₂ in under 20 fs.

Charge relaxation occurs within approximately 2 ps.

A slower return process takes about 60 ps, involving trap states.

Abstract

To take advantage of the exceptional properties of atomically thin transition metal dichalcogenides (TMDC) for advanced devices and catalysts, integration with metallic surfaces is an efficacious approach for facilitating charge carrier injection and extraction from TMDC monolayers. Light-matter interactions predominantly occur at the K point in TMDC monolayers, making the charge carrier dynamics at this point essential for their optimal performance. However, direct access to and comprehensive understanding of the charge carrier dynamics at the K point of TMDC monolayer on a metal substrate remains challenging. In this study, we employed azimuth- and polarization-dependent final-state sum frequency generation (FS-SFG) spectroscopy to investigate the ultrafast dynamics of charge transfer at the K point of a MoS$_2$ monolayer interfaced with an Au substrate. We observed an ultrafast injection (sub-20 fs) of photoexcited hot electrons from the Au substrate to the conduction band minimum (CBM) of the MoS$_2$ monolayer. Subsequently, driven by an internal electric field induced by charge redistribution, injected hot electrons in MoS$_2$ experience a relaxation and fast return ($\sim2$ ps) from the CBM and a trap state mediated slow return ($\sim60$ ps) process. The direct optical observation of the full electron dynamics at the K point of MoS$_2$ monolayer in ambient conditions provides valuable insights into the mechanisms of charge carrier transfer across the TMDC-metal interface, informing the design of advanced TMDC-based devices with enhanced charge transfer rates.