| 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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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
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| Keywords | Perovskite / Photovoltaics / Solar cells / Pb free / Sn / Bi-Ag / perovskite / tin / lead-free / synthesis / XRD / Polyiodide / Pb / x-ray diffraction / solar cells / Pb-free / Reactive Polyiodide Melt |
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| Outline of Research at the Start |
Our original reactive polyiodide melt（RPM）method allows us to explore Pb－free Perovskite and non－Perovskite absorber layers in order to overcome the problem related to the toxicity of Pb-based compounds in the state－of－art MAPbI3 Perovskite solar cells．Using the RPM method. we will synthesize various absorber layers by replacing Pb with earth－abundant non－toxic materials (X). The RPM method，which is of great interest to academia and industry，opens a new route to realize eco－friendly，stable and efficient solar cells in the best interest of our society．
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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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| 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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