| abstract |
Provided is a fullerene derivative which exhibits high LUMO energy and a high open-circuit voltage based thereon and which is highly soluble in polymers and exhibits excellent charge mobility and charge separation ability. A fullerene derivative which has an electron-donating group in close vicinity to the fullerene nucleus, represented by general formula (I) [wherein the encircled FL represents fullerene C60 or C70; Donor-Sub represents a substituent which has at least one electron-donating substitutional atom at a position that is separated from the fullerene nucleus by two bonds; R is hydrogen, Donor-Sub, or a group having 1 to 20 carbon atoms in total, said group being alkyl, cycloalkyl, alkoxy, alkoxy-substituted alkyl, alkoxy-substituted alkoxy, alkylthio-substituted alkoxy, alkylthio, alkylthio-substituted alkylthio, alkoxy-substituted alkylthio, benzyl or phenyl; and n is an integer of 1 to 10]. |