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Organic photovoltaics based on solution-processed benzoporphyrin

Yoshiharu Sato, Takaaki Niinomi, Masahiko Hashiguchi, Yutaka Matsuo, Eiichi Nakamura

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Abstract

Organic photovoltaic cell is fabricated with tetrabenzoporhyrin (BP) as a donor material. Tetrabenzoporhyrin is formed by thermal conversion of the soluble precursor that has four bicycle rings instead of benzo-rings. Upon heat treatment above 150°C, the precursor molecule is converted to semiconductive benzoporphyrin, which is insoluble against conventional organic solvents. Hetero junction OPV cell is made of benzoporhyrin/fullerene layers with power conversion efficiency of 2.2%. Taking advantage of insoluble character of BP, p-i-n heterojunction OPV is successfully fabricated from solution, with BP/BP:fullerene/fullerene layers. This solution-processed p-i-n device exhibited further improvement of power conversion efficiency, 3.0%.

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What this paper is about

Organic photovoltaic cell is fabricated with tetrabenzoporhyrin (BP) as a donor material. Tetrabenzoporhyrin is formed by thermal conversion of the soluble precursor that has four bicycle rings instead of benzo-rings. Upon heat treatment above 150°C, the precursor molecule is converted to semiconductive benzoporphyrin, which is insoluble against conventional organic solvents. Hetero junction OPV cell is made of benzoporhyrin/fullerene layers with power conversion efficiency of 2.2%. Taking advantage of insoluble character of BP, p-i-n heterojunction OPV is successfully fabricated from solution, with BP/BP:fullerene/fullerene layers. This solution-processed p-i-n device exhibited further improvement of power conversion efficiency, 3.0%.

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Available abstract

Organic photovoltaic cell is fabricated with tetrabenzoporhyrin (BP) as a donor material. Tetrabenzoporhyrin is formed by thermal conversion of the soluble precursor that has four bicycle rings instead of benzo-rings. Upon heat treatment above 150°C, the precursor molecule is converted to semiconductive benzoporphyrin, which is insoluble against conventional organic solvents. Hetero junction OPV cell is made of benzoporhyrin/fullerene layers with power conversion efficiency of 2.2%. Taking advantage of insoluble character of BP, p-i-n heterojunction OPV is successfully fabricated from solution, with BP/BP:fullerene/fullerene layers. This solution-processed p-i-n device exhibited further improvement of power conversion efficiency, 3.0%.

Key concepts: Organic solar cell, Energy conversion efficiency, Materials science, Fullerene, Photovoltaics, Optoelectronics, Photovoltaic system, Heterojunction

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