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• Oku, T
• Takeda, A
• Nagata, A
• Noma, T
• Suzuki, A
• Kikuchi, K
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• Takeda, A
• Nagata, A
• Noma, T
• Suzuki, A
• Kikuchi, K
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• Takeda, A
• Nagata, A
• Noma, T
• Suzuki, A
• Kikuchi, K

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Energies 2010, 3(4), 671-685; doi:10.3390/en3040671

Article

Fabrication and Characterization of Fullerene-Based Bulk Heterojunction Solar Cells with Porphyrin, CuInS2, Diamond and Exciton-Diffusion Blocking Layer

Takeo Oku* , Akihiro Takeda, Akihiko Nagata, Tatsuya Noma, Atsushi Suzuki and Kenji Kikuchi

Department of Materials Science, The University of Shiga Prefecture, Hassaka 2500, Hikone, Shiga 522-8533, Japan

* Author to whom correspondence should be addressed.

Received: 26 February 2010 / Accepted: 15 March 2010 / Published: 8 April 2010

(This article belongs to the Special Issue Solar Cells)

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Abstract: Fullerene-based bulk heterojunction solar cells were fabricated, and the electronic and optical properties were investigated. C₆₀ were used as n-type semiconductors, and porphyrin, CuInS₂ and diamond were used as p-type semiconductors. An effect of exciton-diffusion blocking layer of perylene derivative on the solar cells between active layer and metal layer was also investigated. Optimized structures with the exciton-diffusion blocking layer improved conversion efficiencies. Electronic structures of the molecules were investigated by molecular orbital calculation, and energy levels of the solar cells were discussed. Nanostructures of the solar cells were investigated by transmission electron microscopy, electron diffraction and X-ray diffraction, which indicated formation of mixed nanocrystals.

Keywords: fullerene; solar cells; porphyrin; CuInS₂; diamond

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