Research of decomposition mechanism of mixed cation-anionic metal halide perovskite material
| Project/Area Number |
22KF0363
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| Project/Area Number (Other) |
21F21754 (2021-2022)
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Multi-year Fund (2023)
Single-year Grants (2021-2022) |
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| Section | 外国 |
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| Review Section |
Basic Section 36020:Energy-related chemistry
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| Research Institution | Okinawa Institute of Science and Technology Graduate University |
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Principal Investigator |
Qi Yabing 沖縄科学技術大学院大学, エネルギー材料と表面科学ユニット, 教授 (10625015)
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| Co-Investigator(Kenkyū-buntansha) |
MARIOTTI SILVIA 沖縄科学技術大学院大学, エネルギー材料と表面科学ユニット, 外国人特別研究員
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| Project Period (FY) |
2023-03-08 – 2024-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2023: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2022: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2021: ¥400,000 (Direct Cost: ¥400,000)
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| Keywords | Perovskite / self-assembly monolayers / perovskite solar modules / surface passivation / Perovskite passivation / bifacial solar cells |
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| Outline of Research at the Start |
継続課題のため、記入しない。
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| Outline of Annual Research Achievements |
In FY2022 the fellow worked on several research projects and supervised two PhD students. In particular, she worked on three projects: the first focuses on the passivation of the perovskite layer using phenethyl ammonium-halide molecules with the aim to understand the mechanism of these molecules on the perovskite surface, specifically taking into account different perovskite compositions and the effect of different halides (iodine, bromine and chlorine). It is in fact well known in literature that these passivation molecules improve both stability and device performance, but there is no unanimous agreement on the chemical mechanism. The second project focuses on developing new deposition methods for the commonly used self-assembly molecule (2PACz), used as hole transporting material in p-i-n device configuration. This is usually spin-coated and this deposition methos has shown to be effective in making high performing devices but does not allow a uniform coverage on large area devices. We therefore show that alternative deposition methods can be employed, such as thermal evaporation and spray-coating techniques, with the latter being particularly effective for high or even higher device performances compared to the traditional spin-coating method. The fellow also tried to fabricate large area devices (area 22.4cm2) but the performances of control devices remain low due to difficulties in depositing part of the device on large area. The third project is at early stages and involves new electron transporting molecules to be used as self-assembly molecules.
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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
In FY2022 the fellow has being facing issues in fabricating high quality perovskite solar cells, which has cost her considerable time and effort. Nevertheless, perseverance has brought to an improvement of the device performance and she is now hoping to finish her projects soon. Nevertheless, she is still experiencing issues in fabricating large area modules, achieving efficiencies of up to 15% compared to 20% obtained by other groups in the world. Although part of the reasons for the low performance have been found, more experiments are required to optimize the module device performance.
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| Strategy for Future Research Activity |
The plan for FY2023 consists in terminating the fellow’s projects, and write articles for submission. While fundamental experiments have been already performed, the fellow needs to perform surface analysis characterization on phenethyl ammonium passivated samples, to determine the interaction of the organic salt with the perovskite surface, using XPS and UPS. In addition, the fellow would like to terminate the hole transporting material self-assembly project by showing results on perovskite solar modules, which would help to submit the manuscript to a higher impact factor journal. Hence, the fellow will concentrate on the fabrication of large area devices which need a thorough optimization in order to achieve module performances and stability comparable to those presented in literature. In particular, she will consider alternative device architectures that are more suited for large area device fabrication, such as the evaporation deposition method. If she succeeds she will then try to certify those solar modules at AIST (Tsukuba, JP), where the fellow has established a strong collaboration in FY2022. For the third and last project, where the fellow wants to use electron transporting material self-assembly project, she is still determining the best molecular structure by simulations. Nevertheless, preliminary work has shown that the concept can be used to fabricate highly efficient working n-i-p perovskite devices.
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Report
(2 results)
Research Products
(7 results)
