Kato Takehito, Oinuma Chihiro, Otsuka Munechika, Hagiwara Naoki
Department of Mechanical Engineering, National Institute of Technology, Oyama College;
Department of Mechanical Engineering, National Institute of Technology, Oyama College.
J Vis Exp. 2017 Jan 10(119):54923. doi: 10.3791/54923.
The photoactive layer of a typical organic thin-film bulk-heterojunction (BHJ) solar cell commonly uses fullerene derivatives as the electron-accepting material. However, fullerene derivatives are air-sensitive; therefore, air-stable material is needed as an alternative. In the present study, we propose and describe the properties of Ti-alkoxide as an alternative electron-accepting material to fullerene derivatives to create highly air-stable BHJ solar cells. It is well-known that controlling the morphology in the photoactive layer, which is constructed with fullerene derivatives as the electron acceptor, is important for obtaining a high overall efficiency through the solvent method. The conventional solvent method is useful for high-solubility materials, such as fullerene derivatives. However, for Ti-alkoxides, the conventional solvent method is insufficient, because they only dissolve in specific solvents. Here, we demonstrate a new approach to morphology control that uses the molecular bulkiness of Ti-alkoxides without the conventional solvent method. That is, this method is one approach to obtain highly efficient, air-stable, organic-inorganic bulk-heterojunction solar cells.
典型的有机薄膜体异质结（BHJ）太阳能电池的光活性层通常使用富勒烯衍生物作为电子接受材料。然而，富勒烯衍生物对空气敏感；因此，需要一种空气稳定的材料作为替代品。在本研究中，我们提出并描述了钛醇盐作为富勒烯衍生物的替代电子接受材料的特性，以制造高度空气稳定的BHJ太阳能电池。众所周知，对于以富勒烯衍生物作为电子受体构建的光活性层，控制其形态对于通过溶剂法获得高整体效率很重要。传统的溶剂法对于高溶解性材料（如富勒烯衍生物）很有用。然而，对于钛醇盐，传统的溶剂法并不充分，因为它们只溶于特定的溶剂。在此，我们展示了一种新的形态控制方法，该方法利用钛醇盐的分子体积，而无需传统的溶剂法。也就是说，这种方法是获得高效、空气稳定的有机-无机体异质结太阳能电池的一种途径。
