A comparison of two air-stable molecular n-dopants for C60

Abstract We compare two air-stable n -dopants for the fullerene C 60 : AOB and DMBI-POH. Conductivity and Seebeck coefficient measurements were performed at various doping concentrations and the thermal activation of the conductivity was determined. A superlinear increase of conductivity upon doping was found for DMBI-POH doped C 60 reaching a maximum conductivity of 5.3 S/cm. In contrast to this, a linear rise of conductivity and an exponential thermal activation of mobility was observed for C 60 doped by AOB. This suggests a different doping mechanism for the two compounds.