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Riku Okumura, Takeo Oku, Atsushi Suzuki, Masanobu Okita, Sakiko Fukunishi, Tomoharu Tachikawa and Tomoya Hasegawa
First-principles electronic band calculations were used to investigate the effects of alkali metals and organic cations added to Cu-based perovskite solar cells. The copper d-orbital band was slightly above the valence-band maximum and functioned as an a...
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Masaya Taguchi, Atsushi Suzuki, Takeo Oku, Sakiko Fukunishi, Satoshi Minami and Masanobu Okita
Perovskite solar cells, in which decaphenylcyclopentasilane (DPPS) layers were formed on the surface of the perovskite layer, were fabricated, and the influence on photovoltaic characteristics was investigated. The devices were fabricated by a spin-coati...
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Yasuhiro Shirahata and Takeo Oku
Bismuth ferrite (BiFeO3) thin films were prepared by a spin-coating method. Crystal structure and optical properties of the BiFeO3 films were evaluated using X-ray diffraction. The lattice constants, crystallite size, and energy gap of BiFeO3 films depen...
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Atsushi Suzuki, Hiroshi Okada and Takeo Oku
Fabrication and characterization of CH3NH3PbI3-x-yBrxCly perovskite solar cells using mesoporous TiO2 as electron transporting layer and 2,2',7,7'-tetrakis-(...
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Takeo Oku, Taisuke Matsumoto, Atsushi Suzuki and Kohei Suzuki
A perovskite-type solar cell with a substrate size of 70 mm × 70 mm was fabricated by a simple spin-coating method using a mixed solution. The photovoltaic properties of the TiO2/CH3NH3PbI3-based photovoltaic devices were investigated by current density-...
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Takeo Oku, Tetsuya Yamada, Kazuya Fujimoto and Tsuyoshi Akiyama
Copper oxide (Cu2O)-based heterojunction solar cells were fabricated by spin-coating and electrodeposition methods, and photovoltaic properties and microstructures were investigated. Zinc oxide (ZnO) and Cu2O were used as n- and p-type semiconductors, re...
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