Fast preparation of superconducting K-doped C60 films

We have developed a new preparation way in which a superconducting K-doped C60 film can be prepared within only 20 min. The doping time of potassium is shortened largely compared to other works. The doping system is also simple and different from the other works. We only used a usual tubular furnace as a heating source, and placed the tubular furnace and the glass doping tube horizontally. In this way, when the evaporation temperature of potassium is increased for accelerating the doping of potassium into C60 films, the heating effect of hot air on C60 films can be overcome.