| Autor: |
Sang Han, Park, Abhishek, Katoch, Keun Hwa, Chae, Sanjeev, Gautam, Piter, Miedema, Sang Wan, Cho, Minseok, Kim, Ru-Pan, Wang, Masoud, Lazemi, Frank, de Groot, Soonnam, Kwon |
| Rok vydání: |
2021 |
| Zdroj: |
Nature communications. 13(1) |
| ISSN: |
2041-1723 |
| Popis: |
Carrier dynamics affects photocatalytic systems, but direct and real-time observations in an element-specific and energy-level-specific manner are challenging. In this study, we demonstrate that the dynamics of photo-generated holes in metal oxides can be directly probed by using femtosecond X-ray absorption spectroscopy at an X-ray free-electron laser. We identify the energy level and life time of holes with a long life time (230 pico-seconds) in nano-crystal materials. We also observe that trapped holes show an energy distribution in the bandgap region with a formation time of 0.3 pico-seconds and a decay time of 8.0 pico-seconds at room temperature. We corroborate the dynamics of the electrons by using X-ray absorption spectroscopy at the metal L-edges in a consistent explanation with that of the holes. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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