2022 Fiscal Year Annual Research Report
Atomic level structural control and characterisation of perovskite quantum dots
| Project/Area Number |
22J15607
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| Allocation Type | Single-year Grants |
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| Research Institution | The University of Tokyo |
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Principal Investigator |
シュヴァリエ オリビエ 東京大学, 理学系研究科, 特別研究員(DC2)
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| Project Period (FY) |
2022-04-22 – 2024-03-31
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| Keywords | Perovskite / Nanocluster / Blue LED |
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| Outline of Annual Research Achievements |
In the past year, we investigated the effect of carboxylic acid on the performances and properties of perovskite nanocrystals. Specifically, we used Malic Acid to synthesize 2.5 nm blue-emitting perovskite nanocubes. We characterized their properties and demonstrated the emission was narrow and highly efficient, yielding promising blue light-emitting diodes. The stability of the material was evaluated and the narrow emission was maintained over a wide range of voltages. We then precisely characterized their structure and determined a precise cluster composition. We demonstrated ligand binding was limited to the corners of the nanocubes and that ligand chirality transfer could lead to polarized dots. We also investigated surface treatment and their modification via ligand replacement.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
This project is progressing according to plan, or slightly faster than planned. Some topics are progressing faster than expected, and others are progressing more slowly. Specifically, the identification and characterization of the nanomaterials is progressing much faster than was expected. However, the device characterization regarding blue LEDs is progressing more slowly, with significant difficulties encountered in the selection of suitable semiconducting materials.
Additional transversal discoveries are also made and are worth investigating, such as potential blue circularly polarized emission with chiral ligands, which then withdraws some attention from the main topics.
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| Strategy for Future Research Activity |
In this work, we were able to synthesize size-controlled 2.5 nm perovskite quantum dots. In future works, we will generalize this methodology to other compositions, such as chloride-based perovskites and double indium/bismuth perovskites. Additional syntheses will be performed to study 1.8 and 1.2 nm quantum dots and investigate the effects of ultra-small confinement on the properties of perovskite nanomaterials.
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