An object of the present invention is to provide a material that exhibits excellent properties as an n-type semiconductor, in particular as an n-type semiconductor for use in a photoelectric conversion element, such as organic thin-film solar cells. The present invention relates to a fullerene derivative represented by formula (1):
wherein
R1a and R1b are the same or different, and each represents a hydrogen atom or a fluorine atom;
R1c and R1d are the same or different, and each represents a hydrogen atom, a fluorine atom, alkyl, alkoxy, ester, or cyano;
R2 represents (1) phenol optionally substituted with at least one substituent selected from the group consisting of fluorine, alkyl, alkoxy, ester, and cyano, or (2) a 5-membered heteroaryl group optionally substituted with 1 to 3 methyl groups; and
ring A represents a fullerene ring,
with the proviso that when R1a, R1b, R1c, and R1d are each a hydrogen atom, R2 represents phenyl substituted with 1 or 2 fluorine atoms or a 5-membered heteroaryl group optionally substituted with 1 to 3 methyl groups.
本发明的目的是提供一种作为 n 型半导体,特别是作为用于光电转换元件(如有机薄膜太阳能电池)的 n 型半导体,具有优异性能的材料。本发明涉及一种由式(1)表示的
富勒烯衍
生物:
其中
R1a 和 R1b 相同或不同,各自代表一个氢原子或一个
氟原子;
R1c 和 R1d 相同或不同,各自代表氢原子、
氟原子、烷基、烷氧基、酯或
氰基;
R2 代表 (1) 被至少一个选自
氟、烷基、烷氧基、酯和
氰基的取代基任选取代的
苯酚,或 (2) 被 1 至 3 个甲基任选取代的 5 元杂芳基;以及
环 A 代表
富勒烯环、
但当 R1a、R1b、R1c 和 R1d 各为氢原子时,R2 代表被 1 或 2 个
氟原子取代的苯基或任选被 1 至 3 个甲基取代的 5 元杂芳基。