title: Morphology Control for Fully Printable Organic-Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer.
abstract: 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.
authors.affiliation: Department of Mechanical Engineering, National Institute of Technology, Oyama College; kato_t@oyama-ct.ac.jp.
authors.forename: Takehito
authors.initials: T
authors.lastname: Kato
authors.affiliation: Department of Mechanical Engineering, National Institute of Technology, Oyama College.
authors.forename: Chihiro
authors.initials: C
authors.lastname: Oinuma
authors.affiliation: Department of Mechanical Engineering, National Institute of Technology, Oyama College.
authors.forename: Munechika
authors.initials: M
authors.lastname: Otsuka
authors.affiliation: Ashizawa Finetech Ltd.
authors.forename: Naoki
authors.initials: N
authors.lastname: Hagiwara
mesh_terms: D037741:Fullerenes; D011108:Polymers; D012993:Solar Energy; D012995:Solubility; D012997:Solvents; D014025:Titanium
chemical_list: D037741:Fullerenes; D011108:Polymers; D012997:Solvents; D014025:Titanium