Addition of dihydromethano group to fullerenes to improve the performance of bulk heterojunction organic solar cells.

Matsuo, Yutaka; Kawai, Junya; Inada, Hiroshi; Nakagawa, Takafumi; Ota, Hitoshi; Otsubo, Saika; Nakamura, Eiichi · Adv Mater · 2013

basic_science · Level V

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Abstract

Adding a compact dihydromethano (CH2 ) group to a 58π-indene fullerene (C60 (Ind)) creates a 56π-electron dihydromethano/indene fullerene (C60 (CH2 )(Ind)) and raises the LUMO level with only a minimal increase in size. This class of compounds features reduced conjugation that raises the LUMO level, and a high electron mobility because of the small CH2 addend.

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