Abstract
Plasmon induced hot carrier transfer is a promising novel approach for solar energy conversion, but its practical application is often hindered by its low efficiency. This work demonstrates an unprecedented quantum efficiency of plasmonic hot-electron transfer of up to 53 ± 2% from 1.7 nm silver nanoparticles to anatase nanoporous TiO2 films at 400 nm excitation. This efficient hot-electron transfer consists of contributions of both hot electrons generated by plasmon decay through exciting Ag intraband transitions and Ag-to-TiO2 interfacial charge-transfer transitions. The efficiencies of both pathways increase at smaller Ag particle sizes from 5.9 to 1.7 nm, suggesting that decreasing particle sizes is a promising way toward efficient plasmonic hot-carrier extraction.
| Original language | English |
|---|---|
| Pages (from-to) | 1497-1504 |
| Number of pages | 8 |
| Journal | ACS Photonics |
| Volume | 8 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 19 2021 |
Funding
This work was funded by the U.S. Department of Energy, Office of Basic Energy Sciences, Solar Photochemistry Program (grant DE-SC0008798). The Astrella setup used in this work was supported by the instrument grant (CHE-1726536). J.L. Long acknowledges financial support from the China Scholarship Council. A portion of this research was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. Part of the HAADF-STEM and STEM-EDS imaging was performed at the Vanderbilt Institute of Nanoscale Science and Engineering.
Keywords
- TiO
- chemical interface damping
- hot-electron transfer
- plasmon-induced interfacial charge-transfer transition
- silver nanoparticle
- surface plasmon resonance
