2021 Fiscal Year Annual Research Report
高効率赤外光駆動水分解を可能とするプラズモニック光電極の開発
| Project/Area Number |
21J15848
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| Research Institution | Kyoto University |
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Principal Investigator |
LI HAN 京都大学, 理学研究科, 特別研究員(DC2)
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| Project Period (FY) |
2021-04-28 – 2023-03-31
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| Keywords | Cu2-xSeyS1-y / plasmon / band engineering / crystal structure / chemical composition / Fermi level / copper vacancy |
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| Outline of Annual Research Achievements |
In 2021, we developed a simple method to synthesize a series of Cu2-xSeyS1-y alloyed NCs with different crystal phases, including rhombohedral, cubic, orthorhombic, and tetragonal phases. The chemical composition and crystal phases Cu2-xSeyS1-y NCs were finely tuned by varying Se/S ratio during the hot injection process. Consequently, the LSPR absorption in the near-infrared region and the energy band structure were systematically modulated by chaging the crystal phases. We illustrate the mechanism of band engineering modulating the LSPR of such plosmonic semiconductors. This work was currently accepted on the Journal of of Physical Chemistry C.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
We successfully achieved that the synthesis of various Cu2-xSeyS1-y nanocrystals with tunable band structure and LSPR characteristics. We also illustrated the mechanism that band engineerign modulated the LSPR property through varing the chemical composition and crystal structures of such plasmonic semiconductros. Next, we can conduct the evaluation of the performance in the solar energy conversion field of the above nanomaterials.
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| Strategy for Future Research Activity |
In the next year, we plan to utilize the novel Cu2-xSeyS1-y alloyed NCs with tunable band structure and LSPR characteristics to convert solar energy to chemical fuel such as oxygen by NIR light which accounts for 52% of the sunlight. Moreover, we will explore the mechanism how the tunable band structure influence on the plasmon-induced hot carriers in the photoelectrochemical system which plays a key role in improving the performance of plasmonic semiconductors for photoelectrocatalytic oxygen evolution. Finally, we hope we can propose an effective way to improve the solar energy conversion efficiency of plasmonic semiconductros (copper chalcogenides) through tailoring the band structure and LSPR property.
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Research Products
(2 results)
