2012 Fiscal Year Final Research Report
Development of Photovoltaic Systems Utilizing Nanostructure Formation of Liquid-Crystalline Semiconductors
| Project/Area Number |
23750218
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Functional materials/Devices
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| Research Institution | Kyushu University |
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Principal Investigator |
YASUDA Takuma 九州大学, 工学研究院, 准教授 (00401175)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 液晶半導体 / ドナー・アクセプター / ナノ構造 / 有機太陽電池 / ミクロ相分離 |
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| Research Abstract |
Low-bandgap liquid-crystalline organic semiconductors, which have strong visible absorption characteristics in the range of 400-700 nm, have been designed and synthesized. These materials exhibits liquid-crystalline properties and forms well-developed nanostructured bulk heterojunctionarchitectures with a fullerene derivative (PCBM). The morphologies of the blend thin films have been examined by polarizing optical microscopy, atomic force microscopy, and X-ray diffraction analysis. The effects of liquid-crystalline properties on photovoltaic device performances have been studied. Organic solar cells employing the bulk heterojunction blend films show a power conversion efficiency exceeding 4% with a high open-circuit voltage of about 1 V. These results demonstrate that liquid-crystalline organization to direct molecular self-assembly is a promising strategy for fabricating high-performance solution-processed small-molecule organic solar cells.
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