Mg Doping in C60 Layer for C60/a-C Superlattice Solar Cells

Carbon materials can be expected as one of the promising materials for next generation low-cost solar cells. We have proposed C₆₀/a-C superlattice structures as absorption layers. Superlattice structure has advantages to control the optical and electrical properties easily. In this paper, we will report Mg-doping in C₆₀ films to control the conductivity of C₆₀ layers for C₆₀/a-C superlattice solar cells. Mg doping in C ₆₀ films was done by the co-evaporation method of C₆₀ and Mg sources. The resistivity of Mg-doped C₆₀ films reduces in 6 orders of magnitude at the ratio of Mg/C₆₀ of 0.57. It is thought that Mg atoms act as dopant effectively