Flexible Fullerene Field‐Effect Transistors Fabricated Through Solution Processing

C60-based thin-film transistors are fabricated through solution processing. On rigid indium tin oxide glass, the transistors display electron mobilities as high as 0.21 cm2 V−1 s−1 and a threshold voltage of 0.7 V, only slightly lower than those of organic thin-film transistors prepared through vacuum deposition. On ITO-coated PET substrates, the mobilities in the flexible devices (see image) are approximately one order of magnitude lower than those of devices prepared on rigid glass substrates.