Determining doping efficiency and mobility from conductivity and Seebeck   data of n-doped C60 layers
  In this work, we introduce models for deriving lower limits for the key parameters doping efficiency, charge carrier concentration, and charge carrier mobility from conductivity data of doped organic semiconductors. The models are applied to data of thin layers of Fullerene C60 n-doped by four different n-dopants. Combining these findings with thermoelectric Seebeck data, the energetic position of the transport level can be narrowed down and trends for the absolute values are derived. 
Torben Menke, Debdutta Ray, Hans Kleemann, Karl Leo, and Moritz Riede
cond-mat.mtrl-sci