Thermoelectric properties of doped small molecule organic semiconductor films

Abstract

Doped films of organic small molecules are investigated with respect to their thermoelectric properties. A variety of hosts and dopants, for both n and p-doping, are compared. C${}_{60}$ n-doped by Cr${}_2$(hpp)${}_4$ or o-MeO-DMBI-I are found to be the most promising material systems with a maximum of ZT${}_{\text{M}}$ = 0.069 at T${}_{\text{M}}$ = 40°C, assuming a doping-independent thermal conductivity due to phonon-based heat transport. This value is 16% of the current record reported for optimized devices employing the doped polymer PEDOT:PSS.