2019 Fiscal Year Final Research Report
Development of semiconductor materials for ternary solar cells to control the interface of the active layer
| Project/Area Number |
19K21129
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| Project/Area Number (Other) |
18H05979 (2018)
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund (2019)
Single-year Grants (2018) |
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| Review Section |
0501:Physical chemistry, functional solid state chemistry, organic chemistry, polymers, organic materials, biomolecular chemistry, and related fields
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| Research Institution | Hiroshima University |
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Principal Investigator |
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| Project Period (FY) |
2018-08-24 – 2020-03-31
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| Keywords | Semiconducting Polymer / Organic Photocoltaic / Organic Semiconductor / Solar Cell |
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| Outline of Final Research Achievements |
In this project, a ternary system composed of a thaizolothiazole-thiophene polymer (PTzBT) and PCBM with a small amount (ca. 6 wt%) of the third component of ITIC, IT-4F, IEICO-4F, and 3TT-FIC greatly improved the efficiency up to 10.3% (JSC = 16.5 mAcm－2, VOC = 0.89 V, FF = 0.70) from those of the PTzBT:PCBM binary system (7.5%: JSC = 11.3 mAcm－2, VOC = 0.87 V, FF = 0.76). Furthermore, modification of the polymer structure has led to the efficiency close to 11%. We note that this is probably the smallest third component ratio for ternary blend cells that exhibit efficiencies over 10%. Interestingly, although this ternary blend system included only 6 wt% of the third component, the external quantum efficiency at the third component absorption was similar to that at the polymer absorption. In addition, optimal active layer thickness of the PTzBT:PCBM:third component ternary blend cells was as thick as 370 nm.
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| Free Research Field |
Organic Photovoltaics
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| Academic Significance and Societal Importance of the Research Achievements |
従来の有機薄膜太陽電池はp型とn型の二種の材料で活性層を構成するが、本研究では三種類の材料を用いることで幅広い波長の光を吸収して発電させることで光電変換効率の向上を達成した。特に第3成分に使用する量が非常に少なくて住むため、高価な材料を用いた場合でも少量しか用いなくて良いため、低コストで高効率な太陽電池を作製する上で非常に有効である。また、第3成分を変えることで発電させたい波長を可視光から近赤外光まで様々な波長の光を吸収して発電させることができるため、非常に興味深いと考えられる。
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