2023 Fiscal Year Final Research Report
Innovative reactive polyiodide melt method to fabricate lead-free Perovskite absorber layers and solar cells
| Project/Area Number |
19K05683
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 36020:Energy-related chemistry
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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Principal Investigator |
KAZAOUI SAID 国立研究開発法人産業技術総合研究所, エネルギー・環境領域, 主任研究員 (30356761)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | Perovskite / Photovoltaics / Solar cells / Pb free / Sn / Bi-Ag |
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| Outline of Final Research Achievements |
The goal of our project, using our original Reactive Polyiodide Melt (RPM) method (published in Nature Nanotechnology 14, 57 (2019)), was to explore new Pb-free absorber layers for solar cells (PSCs), in order to solve the problem of toxic Pb in Perovskite. The most important achievements are the synthesise of MASnI3 (CH3NH3PbI3)) perovskite by reacting Sn metal thin films with CH3NH3I (MAI) vapor. From the analysis of the XDR data, we suggested a direct conversion mechanism involving the thermal decomposition of MAI and the release of gases as follows Sn+3MAI→MASnI3+(2CH3NH2+H2). We think that this method can be extended to make FAPbI3. Furthermore, AgBiI4 films were prepared by making a stacked layer of Bi-Ag alloys and MAI thin film by vacuum process, and then exposing it to iodine (I2) vapor. The FTO/TiO2/AgBiI4/spiro-OMeTAD/Au solar cells were fabricated, and the best conversion efficiency was 5%. Our results were presented at international conferences and published in journals.
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| Free Research Field |
エネルギー関連化学
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| Academic Significance and Societal Importance of the Research Achievements |
Perovskite solar cells (PSCs) can overcome the energy and the environment issues of our society. However, the best PSCs contain Pb compounds, which are toxic and severely regulated. We implemented our original Reactive Polyiodide Melt (RPM) method to produce Pb-free materials based on Sn and Bi-Ag.
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