2018 Fiscal Year Final Research Report
Development of wideband dye-sensitized solar cells employing spin inversion transition
| Project/Area Number |
26708022
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Partial Multi-year Fund |
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| Research Field |
Energy-related chemistry
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2019-03-31
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| Keywords | 光エネルギー変換 / 太陽電池 / 色素増感 / ペロブスカイト / 光電気化学 / Ru錯体 / スピン軌道相互作用 / 多接合太陽電池 |
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| Outline of Final Research Achievements |
In this research project, the mechanism of spin-inversion excitation was clarified to enable a significant expansion of the light absorption range by dye-sensitized solar cells, and device design was conducted to realize broadband and highly efficient dye-sensitized solar cells. Molecular designs of sensitizing dyes were obtained computationally to realize the extension of light absorption wavelength by sensitizing dyes. The development of a new method for the surface modification of TiO2 has led to the achievement of the world's highest photocurrent value (30 mAcm-2). We succeeded in achieving 21.5% energy conversion efficiency in multi-junction solar cells by combining wideband dye-sensitized solar cells and metal halide perovskite solar cells. Results obtained were far beyond the initial numerical targets.
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| Free Research Field |
光物理化学
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| Academic Significance and Societal Importance of the Research Achievements |
スピンの反転を伴う光学遷移はスピン禁制であるため通常観測されず、光エネルギー変換への応用の研究対象となる事はこれまで無かった。本研究課題では、スピン反転遷移の起源といった基礎的観点から実デバイスにおける広帯域光エネルギー変換の実証といった応用的観点まで幅広く研究を行った。その結果、スピン反転遷移を強く示す錯体色素の合成に成功し、開発著しい有機系太陽電池の分野において最高のエネルギー変換効率を達成した。またこれらスピン反転励起が可能な色素は、国際特許出願を行い製品化・販売された。このように、基礎化学的開拓のみにとどまらず、実社会への還元まで視野に入れた挑戦が研究成果に大きく結びついた。
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