| abstract |
Fullerene derivatives which each have a partial structure represented by general formula (1), in particular, fullerene derivatives which each have one to four partial structures represented by general formula (1) are applicable to organic photoelectric conversion elements with high open-circuit voltage, and are therefore suitable for use in organic thin-film solar cells or organic photo-sensors, thus being extremely useful. In general formula (1), R is a monovalent group; and r is an integer of 0 to 4. |