Ambipolar field-effect transistors based on fullerene peapods

The electrical transport properties of C/sub 70/ and C/sub 60/ fullerene peapods are investigated. We report the fabrications and performances of field-effect transistors (FETs) based on C/sub 70/ and C/sub 60/ fullerene peapods. Most of the fullerene peapod-FETs exhibit ambipolar characteristics at room temperature in air. The origin of ambipolar behavior is also qualitatively discussed. The ambipolar FETs based on fullerene peapods exhibit hysteresis effect in their electrical characteristics.