We report the fabrication of polymer grid triodes (PGTs) usingC60as the semiconducting medium. The structure, a self-assembling porous conducting polyaniline network placed between two semiconducting layers ofC60,and sandwiched between two metal electrodes, demonstrates theI–Vcharacteristics of a three terminal device in which the current is controlled by the grid potential. As a result of the higher mobilities of the fullerenes compared to those of conjugated polymers, the fullerene devices offer some performance advantages; the operating voltages are less than 5 V with current densities exceeding1 mA/cm2.By fabricating devices with different grid densities, it is shown that the grid exhibits a strong influence on theI–Vcharacteristics for high grid densities, and a correspondingly low influence for low densities, in agreement with theory. TheI–Vcharacteristics of theC60PGTs are well described by an effective diode model, similar to that used for vacuum triodes. ©1997 American Institute of Physics.