Ultrafast Charge Transfer Dynamics at the MoS$_2$/Au Interface Observed via Optical Spectroscopy under Ambient Conditions
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2024
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866929472855343104 |
|---|---|
| author | Yang, Tao Huang, Zhipeng Sleziona, Stephan Hasselbrink, Eckart Kratzer, Peter Schleberger, Marika Campen, R. Kramer Tong, Yujin |
| author_facet | Yang, Tao Huang, Zhipeng Sleziona, Stephan Hasselbrink, Eckart Kratzer, Peter Schleberger, Marika Campen, R. Kramer Tong, Yujin |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_13671 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ultrafast Charge Transfer Dynamics at the MoS$_2$/Au Interface Observed via Optical Spectroscopy under Ambient Conditions Yang, Tao Huang, Zhipeng Sleziona, Stephan Hasselbrink, Eckart Kratzer, Peter Schleberger, Marika Campen, R. Kramer Tong, Yujin Mesoscale and Nanoscale Physics Materials Science Optics 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. |
| title | Ultrafast Charge Transfer Dynamics at the MoS$_2$/Au Interface Observed via Optical Spectroscopy under Ambient Conditions |
| topic | Mesoscale and Nanoscale Physics Materials Science Optics |
| url | https://arxiv.org/abs/2408.13671 |