Air-stable n-channel organic transistors based on a soluble C₈₄ fullerene derivative

The fabrication of air-stable n-channel organic transistors based on a soluble C₈₄ fullerene derivative was discussed. The isomeric mixture of PCBM was obtained by performing a standard 1,3-dipolar addition reaction of an in situ generated diazoalkane on this isomeric C₈₄ mixture. Electrochemical measurements on solutions of isomerically pure (60) PCBM and a mixture of isomers (70) PCBM were performed. The microstructure of (84)PCBM films was investigated by X-ray diffraction measurements. Voltage inverters were fabricated by combining n-channel (84)PCBM transistors with p-channel devices to prove that the environmentally stable nature of (84)PCBM transistors can lead to realization of air-stable complementary circuits. Such circuits are expected to provide the low-power consumption required for many low-end organic electronic circuits.